Loading...
1VERSION = 3
2PATCHLEVEL = 1
3SUBLEVEL = 0
4EXTRAVERSION =
5NAME = "Divemaster Edition"
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# Do not:
14# o use make's built-in rules and variables
15# (this increases performance and avoids hard-to-debug behaviour);
16# o print "Entering directory ...";
17MAKEFLAGS += -rR --no-print-directory
18
19# Avoid funny character set dependencies
20unexport LC_ALL
21LC_COLLATE=C
22LC_NUMERIC=C
23export LC_COLLATE LC_NUMERIC
24
25# We are using a recursive build, so we need to do a little thinking
26# to get the ordering right.
27#
28# Most importantly: sub-Makefiles should only ever modify files in
29# their own directory. If in some directory we have a dependency on
30# a file in another dir (which doesn't happen often, but it's often
31# unavoidable when linking the built-in.o targets which finally
32# turn into vmlinux), we will call a sub make in that other dir, and
33# after that we are sure that everything which is in that other dir
34# is now up to date.
35#
36# The only cases where we need to modify files which have global
37# effects are thus separated out and done before the recursive
38# descending is started. They are now explicitly listed as the
39# prepare rule.
40
41# To put more focus on warnings, be less verbose as default
42# Use 'make V=1' to see the full commands
43
44ifeq ("$(origin V)", "command line")
45 KBUILD_VERBOSE = $(V)
46endif
47ifndef KBUILD_VERBOSE
48 KBUILD_VERBOSE = 0
49endif
50
51# Call a source code checker (by default, "sparse") as part of the
52# C compilation.
53#
54# Use 'make C=1' to enable checking of only re-compiled files.
55# Use 'make C=2' to enable checking of *all* source files, regardless
56# of whether they are re-compiled or not.
57#
58# See the file "Documentation/sparse.txt" for more details, including
59# where to get the "sparse" utility.
60
61ifeq ("$(origin C)", "command line")
62 KBUILD_CHECKSRC = $(C)
63endif
64ifndef KBUILD_CHECKSRC
65 KBUILD_CHECKSRC = 0
66endif
67
68# Use make M=dir to specify directory of external module to build
69# Old syntax make ... SUBDIRS=$PWD is still supported
70# Setting the environment variable KBUILD_EXTMOD take precedence
71ifdef SUBDIRS
72 KBUILD_EXTMOD ?= $(SUBDIRS)
73endif
74
75ifeq ("$(origin M)", "command line")
76 KBUILD_EXTMOD := $(M)
77endif
78
79# kbuild supports saving output files in a separate directory.
80# To locate output files in a separate directory two syntaxes are supported.
81# In both cases the working directory must be the root of the kernel src.
82# 1) O=
83# Use "make O=dir/to/store/output/files/"
84#
85# 2) Set KBUILD_OUTPUT
86# Set the environment variable KBUILD_OUTPUT to point to the directory
87# where the output files shall be placed.
88# export KBUILD_OUTPUT=dir/to/store/output/files/
89# make
90#
91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
92# variable.
93
94
95# KBUILD_SRC is set on invocation of make in OBJ directory
96# KBUILD_SRC is not intended to be used by the regular user (for now)
97ifeq ($(KBUILD_SRC),)
98
99# OK, Make called in directory where kernel src resides
100# Do we want to locate output files in a separate directory?
101ifeq ("$(origin O)", "command line")
102 KBUILD_OUTPUT := $(O)
103endif
104
105ifeq ("$(origin W)", "command line")
106 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
107endif
108
109# That's our default target when none is given on the command line
110PHONY := _all
111_all:
112
113# Cancel implicit rules on top Makefile
114$(CURDIR)/Makefile Makefile: ;
115
116ifneq ($(KBUILD_OUTPUT),)
117# Invoke a second make in the output directory, passing relevant variables
118# check that the output directory actually exists
119saved-output := $(KBUILD_OUTPUT)
120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
121$(if $(KBUILD_OUTPUT),, \
122 $(error output directory "$(saved-output)" does not exist))
123
124PHONY += $(MAKECMDGOALS) sub-make
125
126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127 $(Q)@:
128
129sub-make: FORCE
130 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
131 KBUILD_SRC=$(CURDIR) \
132 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
133 $(filter-out _all sub-make,$(MAKECMDGOALS))
134
135# Leave processing to above invocation of make
136skip-makefile := 1
137endif # ifneq ($(KBUILD_OUTPUT),)
138endif # ifeq ($(KBUILD_SRC),)
139
140# We process the rest of the Makefile if this is the final invocation of make
141ifeq ($(skip-makefile),)
142
143# If building an external module we do not care about the all: rule
144# but instead _all depend on modules
145PHONY += all
146ifeq ($(KBUILD_EXTMOD),)
147_all: all
148else
149_all: modules
150endif
151
152srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
153objtree := $(CURDIR)
154src := $(srctree)
155obj := $(objtree)
156
157VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159export srctree objtree VPATH
160
161
162# SUBARCH tells the usermode build what the underlying arch is. That is set
163# first, and if a usermode build is happening, the "ARCH=um" on the command
164# line overrides the setting of ARCH below. If a native build is happening,
165# then ARCH is assigned, getting whatever value it gets normally, and
166# SUBARCH is subsequently ignored.
167
168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64 \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
172 -e s/sh[234].*/sh/ )
173
174# Cross compiling and selecting different set of gcc/bin-utils
175# ---------------------------------------------------------------------------
176#
177# When performing cross compilation for other architectures ARCH shall be set
178# to the target architecture. (See arch/* for the possibilities).
179# ARCH can be set during invocation of make:
180# make ARCH=ia64
181# Another way is to have ARCH set in the environment.
182# The default ARCH is the host where make is executed.
183
184# CROSS_COMPILE specify the prefix used for all executables used
185# during compilation. Only gcc and related bin-utils executables
186# are prefixed with $(CROSS_COMPILE).
187# CROSS_COMPILE can be set on the command line
188# make CROSS_COMPILE=ia64-linux-
189# Alternatively CROSS_COMPILE can be set in the environment.
190# A third alternative is to store a setting in .config so that plain
191# "make" in the configured kernel build directory always uses that.
192# Default value for CROSS_COMPILE is not to prefix executables
193# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
194export KBUILD_BUILDHOST := $(SUBARCH)
195ARCH ?= $(SUBARCH)
196CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
197
198# Architecture as present in compile.h
199UTS_MACHINE := $(ARCH)
200SRCARCH := $(ARCH)
201
202# Additional ARCH settings for x86
203ifeq ($(ARCH),i386)
204 SRCARCH := x86
205endif
206ifeq ($(ARCH),x86_64)
207 SRCARCH := x86
208endif
209
210# Additional ARCH settings for sparc
211ifeq ($(ARCH),sparc32)
212 SRCARCH := sparc
213endif
214ifeq ($(ARCH),sparc64)
215 SRCARCH := sparc
216endif
217
218# Additional ARCH settings for sh
219ifeq ($(ARCH),sh64)
220 SRCARCH := sh
221endif
222
223# Additional ARCH settings for tile
224ifeq ($(ARCH),tilepro)
225 SRCARCH := tile
226endif
227ifeq ($(ARCH),tilegx)
228 SRCARCH := tile
229endif
230
231# Where to locate arch specific headers
232hdr-arch := $(SRCARCH)
233
234ifeq ($(ARCH),m68knommu)
235 hdr-arch := m68k
236endif
237
238KCONFIG_CONFIG ?= .config
239export KCONFIG_CONFIG
240
241# SHELL used by kbuild
242CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
243 else if [ -x /bin/bash ]; then echo /bin/bash; \
244 else echo sh; fi ; fi)
245
246HOSTCC = gcc
247HOSTCXX = g++
248HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
249HOSTCXXFLAGS = -O2
250
251# Decide whether to build built-in, modular, or both.
252# Normally, just do built-in.
253
254KBUILD_MODULES :=
255KBUILD_BUILTIN := 1
256
257# If we have only "make modules", don't compile built-in objects.
258# When we're building modules with modversions, we need to consider
259# the built-in objects during the descend as well, in order to
260# make sure the checksums are up to date before we record them.
261
262ifeq ($(MAKECMDGOALS),modules)
263 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
264endif
265
266# If we have "make <whatever> modules", compile modules
267# in addition to whatever we do anyway.
268# Just "make" or "make all" shall build modules as well
269
270ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
271 KBUILD_MODULES := 1
272endif
273
274ifeq ($(MAKECMDGOALS),)
275 KBUILD_MODULES := 1
276endif
277
278export KBUILD_MODULES KBUILD_BUILTIN
279export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
280
281# Beautify output
282# ---------------------------------------------------------------------------
283#
284# Normally, we echo the whole command before executing it. By making
285# that echo $($(quiet)$(cmd)), we now have the possibility to set
286# $(quiet) to choose other forms of output instead, e.g.
287#
288# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
289# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
290#
291# If $(quiet) is empty, the whole command will be printed.
292# If it is set to "quiet_", only the short version will be printed.
293# If it is set to "silent_", nothing will be printed at all, since
294# the variable $(silent_cmd_cc_o_c) doesn't exist.
295#
296# A simple variant is to prefix commands with $(Q) - that's useful
297# for commands that shall be hidden in non-verbose mode.
298#
299# $(Q)ln $@ :<
300#
301# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
302# If KBUILD_VERBOSE equals 1 then the above command is displayed.
303
304ifeq ($(KBUILD_VERBOSE),1)
305 quiet =
306 Q =
307else
308 quiet=quiet_
309 Q = @
310endif
311
312# If the user is running make -s (silent mode), suppress echoing of
313# commands
314
315ifneq ($(findstring s,$(MAKEFLAGS)),)
316 quiet=silent_
317endif
318
319export quiet Q KBUILD_VERBOSE
320
321
322# Look for make include files relative to root of kernel src
323MAKEFLAGS += --include-dir=$(srctree)
324
325# We need some generic definitions (do not try to remake the file).
326$(srctree)/scripts/Kbuild.include: ;
327include $(srctree)/scripts/Kbuild.include
328
329# Make variables (CC, etc...)
330
331AS = $(CROSS_COMPILE)as
332LD = $(CROSS_COMPILE)ld
333CC = $(CROSS_COMPILE)gcc
334CPP = $(CC) -E
335AR = $(CROSS_COMPILE)ar
336NM = $(CROSS_COMPILE)nm
337STRIP = $(CROSS_COMPILE)strip
338OBJCOPY = $(CROSS_COMPILE)objcopy
339OBJDUMP = $(CROSS_COMPILE)objdump
340AWK = awk
341GENKSYMS = scripts/genksyms/genksyms
342INSTALLKERNEL := installkernel
343DEPMOD = /sbin/depmod
344KALLSYMS = scripts/kallsyms
345PERL = perl
346CHECK = sparse
347
348CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
349 -Wbitwise -Wno-return-void $(CF)
350CFLAGS_MODULE =
351AFLAGS_MODULE =
352LDFLAGS_MODULE =
353CFLAGS_KERNEL =
354AFLAGS_KERNEL =
355CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
356
357
358# Use LINUXINCLUDE when you must reference the include/ directory.
359# Needed to be compatible with the O= option
360LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \
361 -Iarch/$(hdr-arch)/include/generated -Iinclude \
362 $(if $(KBUILD_SRC), -I$(srctree)/include) \
363 -include $(srctree)/include/linux/kconfig.h
364
365KBUILD_CPPFLAGS := -D__KERNEL__
366
367KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
368 -fno-strict-aliasing -fno-common \
369 -Werror-implicit-function-declaration \
370 -Wno-format-security \
371 -fno-delete-null-pointer-checks
372KBUILD_AFLAGS_KERNEL :=
373KBUILD_CFLAGS_KERNEL :=
374KBUILD_AFLAGS := -D__ASSEMBLY__
375KBUILD_AFLAGS_MODULE := -DMODULE
376KBUILD_CFLAGS_MODULE := -DMODULE
377KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
378
379# Read KERNELRELEASE from include/config/kernel.release (if it exists)
380KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
381KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
382
383export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
384export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
385export CPP AR NM STRIP OBJCOPY OBJDUMP
386export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
387export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
388
389export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
390export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
391export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
392export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
393export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
394export KBUILD_ARFLAGS
395
396# When compiling out-of-tree modules, put MODVERDIR in the module
397# tree rather than in the kernel tree. The kernel tree might
398# even be read-only.
399export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
400
401# Files to ignore in find ... statements
402
403RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
404export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
405
406# ===========================================================================
407# Rules shared between *config targets and build targets
408
409# Basic helpers built in scripts
410PHONY += scripts_basic
411scripts_basic:
412 $(Q)$(MAKE) $(build)=scripts/basic
413 $(Q)rm -f .tmp_quiet_recordmcount
414
415# To avoid any implicit rule to kick in, define an empty command.
416scripts/basic/%: scripts_basic ;
417
418PHONY += outputmakefile
419# outputmakefile generates a Makefile in the output directory, if using a
420# separate output directory. This allows convenient use of make in the
421# output directory.
422outputmakefile:
423ifneq ($(KBUILD_SRC),)
424 $(Q)ln -fsn $(srctree) source
425 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
426 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
427endif
428
429# Support for using generic headers in asm-generic
430PHONY += asm-generic
431asm-generic:
432 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
433 obj=arch/$(SRCARCH)/include/generated/asm
434
435# To make sure we do not include .config for any of the *config targets
436# catch them early, and hand them over to scripts/kconfig/Makefile
437# It is allowed to specify more targets when calling make, including
438# mixing *config targets and build targets.
439# For example 'make oldconfig all'.
440# Detect when mixed targets is specified, and make a second invocation
441# of make so .config is not included in this case either (for *config).
442
443no-dot-config-targets := clean mrproper distclean \
444 cscope gtags TAGS tags help %docs check% coccicheck \
445 include/linux/version.h headers_% \
446 kernelversion %src-pkg
447
448config-targets := 0
449mixed-targets := 0
450dot-config := 1
451
452ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
453 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
454 dot-config := 0
455 endif
456endif
457
458ifeq ($(KBUILD_EXTMOD),)
459 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
460 config-targets := 1
461 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
462 mixed-targets := 1
463 endif
464 endif
465endif
466
467ifeq ($(mixed-targets),1)
468# ===========================================================================
469# We're called with mixed targets (*config and build targets).
470# Handle them one by one.
471
472%:: FORCE
473 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
474
475else
476ifeq ($(config-targets),1)
477# ===========================================================================
478# *config targets only - make sure prerequisites are updated, and descend
479# in scripts/kconfig to make the *config target
480
481# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
482# KBUILD_DEFCONFIG may point out an alternative default configuration
483# used for 'make defconfig'
484include $(srctree)/arch/$(SRCARCH)/Makefile
485export KBUILD_DEFCONFIG KBUILD_KCONFIG
486
487config: scripts_basic outputmakefile FORCE
488 $(Q)mkdir -p include/linux include/config
489 $(Q)$(MAKE) $(build)=scripts/kconfig $@
490
491%config: scripts_basic outputmakefile FORCE
492 $(Q)mkdir -p include/linux include/config
493 $(Q)$(MAKE) $(build)=scripts/kconfig $@
494
495else
496# ===========================================================================
497# Build targets only - this includes vmlinux, arch specific targets, clean
498# targets and others. In general all targets except *config targets.
499
500ifeq ($(KBUILD_EXTMOD),)
501# Additional helpers built in scripts
502# Carefully list dependencies so we do not try to build scripts twice
503# in parallel
504PHONY += scripts
505scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
506 $(Q)$(MAKE) $(build)=$(@)
507
508# Objects we will link into vmlinux / subdirs we need to visit
509init-y := init
510drivers-y := drivers sound firmware
511net-y := net
512libs-y := lib
513core-y := usr
514endif # KBUILD_EXTMOD
515
516ifeq ($(dot-config),1)
517# Read in config
518-include include/config/auto.conf
519
520ifeq ($(KBUILD_EXTMOD),)
521# Read in dependencies to all Kconfig* files, make sure to run
522# oldconfig if changes are detected.
523-include include/config/auto.conf.cmd
524
525# To avoid any implicit rule to kick in, define an empty command
526$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
527
528# If .config is newer than include/config/auto.conf, someone tinkered
529# with it and forgot to run make oldconfig.
530# if auto.conf.cmd is missing then we are probably in a cleaned tree so
531# we execute the config step to be sure to catch updated Kconfig files
532include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
533 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
534else
535# external modules needs include/generated/autoconf.h and include/config/auto.conf
536# but do not care if they are up-to-date. Use auto.conf to trigger the test
537PHONY += include/config/auto.conf
538
539include/config/auto.conf:
540 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
541 echo; \
542 echo " ERROR: Kernel configuration is invalid."; \
543 echo " include/generated/autoconf.h or $@ are missing.";\
544 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
545 echo; \
546 /bin/false)
547
548endif # KBUILD_EXTMOD
549
550else
551# Dummy target needed, because used as prerequisite
552include/config/auto.conf: ;
553endif # $(dot-config)
554
555# The all: target is the default when no target is given on the
556# command line.
557# This allow a user to issue only 'make' to build a kernel including modules
558# Defaults to vmlinux, but the arch makefile usually adds further targets
559all: vmlinux
560
561ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
562KBUILD_CFLAGS += -Os
563else
564KBUILD_CFLAGS += -O2
565endif
566
567include $(srctree)/arch/$(SRCARCH)/Makefile
568
569ifneq ($(CONFIG_FRAME_WARN),0)
570KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
571endif
572
573# Force gcc to behave correct even for buggy distributions
574ifndef CONFIG_CC_STACKPROTECTOR
575KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
576endif
577
578# This warning generated too much noise in a regular build.
579# Use make W=1 to enable this warning (see scripts/Makefile.build)
580KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
581
582ifdef CONFIG_FRAME_POINTER
583KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
584else
585# Some targets (ARM with Thumb2, for example), can't be built with frame
586# pointers. For those, we don't have FUNCTION_TRACER automatically
587# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
588# incompatible with -fomit-frame-pointer with current GCC, so we don't use
589# -fomit-frame-pointer with FUNCTION_TRACER.
590ifndef CONFIG_FUNCTION_TRACER
591KBUILD_CFLAGS += -fomit-frame-pointer
592endif
593endif
594
595ifdef CONFIG_DEBUG_INFO
596KBUILD_CFLAGS += -g
597KBUILD_AFLAGS += -gdwarf-2
598endif
599
600ifdef CONFIG_DEBUG_INFO_REDUCED
601KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
602endif
603
604ifdef CONFIG_FUNCTION_TRACER
605KBUILD_CFLAGS += -pg
606ifdef CONFIG_DYNAMIC_FTRACE
607 ifdef CONFIG_HAVE_C_RECORDMCOUNT
608 BUILD_C_RECORDMCOUNT := y
609 export BUILD_C_RECORDMCOUNT
610 endif
611endif
612endif
613
614# We trigger additional mismatches with less inlining
615ifdef CONFIG_DEBUG_SECTION_MISMATCH
616KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
617endif
618
619# arch Makefile may override CC so keep this after arch Makefile is included
620NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
621CHECKFLAGS += $(NOSTDINC_FLAGS)
622
623# warn about C99 declaration after statement
624KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
625
626# disable pointer signed / unsigned warnings in gcc 4.0
627KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
628
629# disable invalid "can't wrap" optimizations for signed / pointers
630KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
631
632# conserve stack if available
633KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
634
635# use the deterministic mode of AR if available
636KBUILD_ARFLAGS := $(call ar-option,D)
637
638# check for 'asm goto'
639ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
640 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
641endif
642
643# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
644# But warn user when we do so
645warn-assign = \
646$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
647
648ifneq ($(KCPPFLAGS),)
649 $(call warn-assign,CPPFLAGS)
650 KBUILD_CPPFLAGS += $(KCPPFLAGS)
651endif
652ifneq ($(KAFLAGS),)
653 $(call warn-assign,AFLAGS)
654 KBUILD_AFLAGS += $(KAFLAGS)
655endif
656ifneq ($(KCFLAGS),)
657 $(call warn-assign,CFLAGS)
658 KBUILD_CFLAGS += $(KCFLAGS)
659endif
660
661# Use --build-id when available.
662LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
663 $(call cc-ldoption, -Wl$(comma)--build-id,))
664KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
665LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
666
667ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
668LDFLAGS_vmlinux += $(call ld-option, -X,)
669endif
670
671# Default kernel image to build when no specific target is given.
672# KBUILD_IMAGE may be overruled on the command line or
673# set in the environment
674# Also any assignments in arch/$(ARCH)/Makefile take precedence over
675# this default value
676export KBUILD_IMAGE ?= vmlinux
677
678#
679# INSTALL_PATH specifies where to place the updated kernel and system map
680# images. Default is /boot, but you can set it to other values
681export INSTALL_PATH ?= /boot
682
683#
684# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
685# relocations required by build roots. This is not defined in the
686# makefile but the argument can be passed to make if needed.
687#
688
689MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
690export MODLIB
691
692#
693# INSTALL_MOD_STRIP, if defined, will cause modules to be
694# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
695# the default option --strip-debug will be used. Otherwise,
696# INSTALL_MOD_STRIP value will be used as the options to the strip command.
697
698ifdef INSTALL_MOD_STRIP
699ifeq ($(INSTALL_MOD_STRIP),1)
700mod_strip_cmd = $(STRIP) --strip-debug
701else
702mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
703endif # INSTALL_MOD_STRIP=1
704else
705mod_strip_cmd = true
706endif # INSTALL_MOD_STRIP
707export mod_strip_cmd
708
709
710ifeq ($(KBUILD_EXTMOD),)
711core-y += kernel mm fs ipc security crypto block
712
713vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
714 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
715 $(net-y) $(net-m) $(libs-y) $(libs-m)))
716
717vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
718 $(init-n) $(init-) \
719 $(core-n) $(core-) $(drivers-n) $(drivers-) \
720 $(net-n) $(net-) $(libs-n) $(libs-))))
721
722init-y := $(patsubst %/, %/built-in.o, $(init-y))
723core-y := $(patsubst %/, %/built-in.o, $(core-y))
724drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
725net-y := $(patsubst %/, %/built-in.o, $(net-y))
726libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
727libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
728libs-y := $(libs-y1) $(libs-y2)
729
730# Build vmlinux
731# ---------------------------------------------------------------------------
732# vmlinux is built from the objects selected by $(vmlinux-init) and
733# $(vmlinux-main). Most are built-in.o files from top-level directories
734# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
735# Ordering when linking is important, and $(vmlinux-init) must be first.
736#
737# vmlinux
738# ^
739# |
740# +-< $(vmlinux-init)
741# | +--< init/version.o + more
742# |
743# +--< $(vmlinux-main)
744# | +--< driver/built-in.o mm/built-in.o + more
745# |
746# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
747#
748# vmlinux version (uname -v) cannot be updated during normal
749# descending-into-subdirs phase since we do not yet know if we need to
750# update vmlinux.
751# Therefore this step is delayed until just before final link of vmlinux -
752# except in the kallsyms case where it is done just before adding the
753# symbols to the kernel.
754#
755# System.map is generated to document addresses of all kernel symbols
756
757vmlinux-init := $(head-y) $(init-y)
758vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
759vmlinux-all := $(vmlinux-init) $(vmlinux-main)
760vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
761export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
762
763# Rule to link vmlinux - also used during CONFIG_KALLSYMS
764# May be overridden by arch/$(ARCH)/Makefile
765quiet_cmd_vmlinux__ ?= LD $@
766 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
767 -T $(vmlinux-lds) $(vmlinux-init) \
768 --start-group $(vmlinux-main) --end-group \
769 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
770
771# Generate new vmlinux version
772quiet_cmd_vmlinux_version = GEN .version
773 cmd_vmlinux_version = set -e; \
774 if [ ! -r .version ]; then \
775 rm -f .version; \
776 echo 1 >.version; \
777 else \
778 mv .version .old_version; \
779 expr 0$$(cat .old_version) + 1 >.version; \
780 fi; \
781 $(MAKE) $(build)=init
782
783# Generate System.map
784quiet_cmd_sysmap = SYSMAP
785 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
786
787# Link of vmlinux
788# If CONFIG_KALLSYMS is set .version is already updated
789# Generate System.map and verify that the content is consistent
790# Use + in front of the vmlinux_version rule to silent warning with make -j2
791# First command is ':' to allow us to use + in front of the rule
792define rule_vmlinux__
793 :
794 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
795
796 $(call cmd,vmlinux__)
797 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
798
799 $(Q)$(if $($(quiet)cmd_sysmap), \
800 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
801 $(cmd_sysmap) $@ System.map; \
802 if [ $$? -ne 0 ]; then \
803 rm -f $@; \
804 /bin/false; \
805 fi;
806 $(verify_kallsyms)
807endef
808
809
810ifdef CONFIG_KALLSYMS
811# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
812# It's a three stage process:
813# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
814# empty
815# Running kallsyms on that gives us .tmp_kallsyms1.o with
816# the right size - vmlinux version (uname -v) is updated during this step
817# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
818# but due to the added section, some addresses have shifted.
819# From here, we generate a correct .tmp_kallsyms2.o
820# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
821# o Verify that the System.map from vmlinux matches the map from
822# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
823# o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
824# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
825# temporary bypass to allow the kernel to be built while the
826# maintainers work out what went wrong with kallsyms.
827
828last_kallsyms := 2
829
830ifdef KALLSYMS_EXTRA_PASS
831ifneq ($(KALLSYMS_EXTRA_PASS),0)
832last_kallsyms := 3
833endif
834endif
835
836kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
837
838define verify_kallsyms
839 $(Q)$(if $($(quiet)cmd_sysmap), \
840 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
841 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
842 $(Q)cmp -s System.map .tmp_System.map || \
843 (echo Inconsistent kallsyms data; \
844 echo This is a bug - please report about it; \
845 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \
846 rm .tmp_kallsyms* ; /bin/false )
847endef
848
849# Update vmlinux version before link
850# Use + in front of this rule to silent warning about make -j1
851# First command is ':' to allow us to use + in front of this rule
852cmd_ksym_ld = $(cmd_vmlinux__)
853define rule_ksym_ld
854 :
855 +$(call cmd,vmlinux_version)
856 $(call cmd,vmlinux__)
857 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
858endef
859
860# Generate .S file with all kernel symbols
861quiet_cmd_kallsyms = KSYM $@
862 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
863 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
864
865.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
866 $(call if_changed_dep,as_o_S)
867
868.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
869 $(call cmd,kallsyms)
870
871# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
872.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
873 $(call if_changed_rule,ksym_ld)
874
875.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
876 $(call if_changed,vmlinux__)
877
878.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
879 $(call if_changed,vmlinux__)
880
881# Needs to visit scripts before $(KALLSYMS) can be used.
882$(KALLSYMS): scripts ;
883
884# Generate some data for debugging strange kallsyms problems
885debug_kallsyms: .tmp_map$(last_kallsyms)
886
887.tmp_map%: .tmp_vmlinux% FORCE
888 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
889
890.tmp_map3: .tmp_map2
891
892.tmp_map2: .tmp_map1
893
894endif # ifdef CONFIG_KALLSYMS
895
896# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
897# relevant sections renamed as per the linker script.
898quiet_cmd_vmlinux-modpost = LD $@
899 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
900 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
901 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
902define rule_vmlinux-modpost
903 :
904 +$(call cmd,vmlinux-modpost)
905 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
906 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
907endef
908
909# vmlinux image - including updated kernel symbols
910vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) __KEEPMAKEFILEO__I.o $(kallsyms.o) FORCE
911ifdef CONFIG_HEADERS_CHECK
912 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
913endif
914ifdef CONFIG_SAMPLES
915 $(Q)$(MAKE) $(build)=samples
916endif
917ifdef CONFIG_BUILD_DOCSRC
918 $(Q)$(MAKE) $(build)=Documentation
919endif
920 $(call vmlinux-modpost)
921 $(call if_changed_rule,vmlinux__)
922 $(Q)rm -f .old_version
923
924# build vmlinux.o first to catch section mismatch errors early
925ifdef CONFIG_KALLSYMS
926.tmp_vmlinux1: __KEEPMAKEFILEO__BA.o
927endif
928
929modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
930vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
931 $(call if_changed_rule,vmlinux-modpost)
932
933# The actual objects are generated when descending,
934# make sure no implicit rule kicks in
935$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
936
937# Handle descending into subdirectories listed in $(vmlinux-dirs)
938# Preset locale variables to speed up the build process. Limit locale
939# tweaks to this spot to avoid wrong language settings when running
940# make menuconfig etc.
941# Error messages still appears in the original language
942
943PHONY += $(vmlinux-dirs)
944$(vmlinux-dirs): prepare scripts
945 $(Q)$(MAKE) $(build)=$@
946
947# Store (new) KERNELRELASE string in include/config/kernel.release
948include/config/kernel.release: include/config/auto.conf FORCE
949 $(Q)rm -f $@
950 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
951
952
953# Things we need to do before we recursively start building the kernel
954# or the modules are listed in "prepare".
955# A multi level approach is used. prepareN is processed before prepareN-1.
956# archprepare is used in arch Makefiles and when processed asm symlink,
957# version.h and scripts_basic is processed / created.
958
959# Listed in dependency order
960PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
961
962# prepare3 is used to check if we are building in a separate output directory,
963# and if so do:
964# 1) Check that make has not been executed in the kernel src $(srctree)
965prepare3: include/config/kernel.release
966ifneq ($(KBUILD_SRC),)
967 @$(kecho) ' Using $(srctree) as source for kernel'
968 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
969 echo " $(srctree) is not clean, please run 'make mrproper'";\
970 echo " in the '$(srctree)' directory.";\
971 /bin/false; \
972 fi;
973endif
974
975# prepare2 creates a makefile if using a separate output directory
976prepare2: prepare3 outputmakefile asm-generic
977
978prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
979 include/config/auto.conf
980 $(cmd_crmodverdir)
981
982archprepare: prepare1 scripts_basic
983
984prepare0: archprepare FORCE
985 $(Q)$(MAKE) $(build)=.
986 $(Q)$(MAKE) $(build)=. missing-syscalls
987
988# All the preparing..
989prepare: prepare0
990
991# Generate some files
992# ---------------------------------------------------------------------------
993
994# KERNELRELEASE can change from a few different places, meaning version.h
995# needs to be updated, so this check is forced on all builds
996
997uts_len := 64
998define filechk_utsrelease.h
999 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1000 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1001 exit 1; \
1002 fi; \
1003 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1004endef
1005
1006define filechk_version.h
1007 (echo \#define LINUX_VERSION_CODE $(shell \
1008 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1009 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1010endef
1011
1012include/linux/version.h: $(srctree)/Makefile FORCE
1013 $(call filechk,version.h)
1014
1015include/generated/utsrelease.h: include/config/kernel.release FORCE
1016 $(call filechk,utsrelease.h)
1017
1018PHONY += headerdep
1019headerdep:
1020 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1021 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1022
1023# ---------------------------------------------------------------------------
1024
1025PHONY += depend dep
1026depend dep:
1027 @echo '*** Warning: make $@ is unnecessary now.'
1028
1029# ---------------------------------------------------------------------------
1030# Firmware install
1031INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1032export INSTALL_FW_PATH
1033
1034PHONY += firmware_install
1035firmware_install: FORCE
1036 @mkdir -p $(objtree)/firmware
1037 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1038
1039# ---------------------------------------------------------------------------
1040# Kernel headers
1041
1042#Default location for installed headers
1043export INSTALL_HDR_PATH = $(objtree)/usr
1044
1045hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1046
1047# If we do an all arch process set dst to asm-$(hdr-arch)
1048hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1049
1050PHONY += __headers
1051__headers: include/linux/version.h scripts_basic asm-generic FORCE
1052 $(Q)$(MAKE) $(build)=scripts build_unifdef
1053
1054PHONY += headers_install_all
1055headers_install_all:
1056 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057
1058PHONY += headers_install
1059headers_install: __headers
1060 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1061 $(error Headers not exportable for the $(SRCARCH) architecture))
1062 $(Q)$(MAKE) $(hdr-inst)=include
1063 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1064
1065PHONY += headers_check_all
1066headers_check_all: headers_install_all
1067 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068
1069PHONY += headers_check
1070headers_check: headers_install
1071 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1072 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1073
1074# ---------------------------------------------------------------------------
1075# Modules
1076
1077ifdef CONFIG_MODULES
1078
1079# By default, build modules as well
1080
1081all: modules
1082
1083# Build modules
1084#
1085# A module can be listed more than once in obj-m resulting in
1086# duplicate lines in modules.order files. Those are removed
1087# using awk while concatenating to the final file.
1088
1089PHONY += modules
1090modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1091 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1092 @$(kecho) ' Building modules, stage 2.';
1093 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1094 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1095
1096modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1097 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1098
1099%/modules.builtin: include/config/auto.conf
1100 $(Q)$(MAKE) $(modbuiltin)=$*
1101
1102
1103# Target to prepare building external modules
1104PHONY += modules_prepare
1105modules_prepare: prepare scripts
1106
1107# Target to install modules
1108PHONY += modules_install
1109modules_install: _modinst_ _modinst_post
1110
1111PHONY += _modinst_
1112_modinst_:
1113 @rm -rf $(MODLIB)/kernel
1114 @rm -f $(MODLIB)/source
1115 @mkdir -p $(MODLIB)/kernel
1116 @ln -s $(srctree) $(MODLIB)/source
1117 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1118 rm -f $(MODLIB)/build ; \
1119 ln -s $(objtree) $(MODLIB)/build ; \
1120 fi
1121 @cp -f $(objtree)/modules.order $(MODLIB)/
1122 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1123 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1124
1125# This depmod is only for convenience to give the initial
1126# boot a modules.dep even before / is mounted read-write. However the
1127# boot script depmod is the master version.
1128PHONY += _modinst_post
1129_modinst_post: _modinst_
1130 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1131 $(call cmd,depmod)
1132
1133else # CONFIG_MODULES
1134
1135# Modules not configured
1136# ---------------------------------------------------------------------------
1137
1138modules modules_install: FORCE
1139 @echo
1140 @echo "The present kernel configuration has modules disabled."
1141 @echo "Type 'make config' and enable loadable module support."
1142 @echo "Then build a kernel with module support enabled."
1143 @echo
1144 @exit 1
1145
1146endif # CONFIG_MODULES
1147
1148###
1149# Cleaning is done on three levels.
1150# make clean Delete most generated files
1151# Leave enough to build external modules
1152# make mrproper Delete the current configuration, and all generated files
1153# make distclean Remove editor backup files, patch leftover files and the like
1154
1155# Directories & files removed with 'make clean'
1156CLEAN_DIRS += $(MODVERDIR)
1157CLEAN_FILES += vmlinux System.map \
1158 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1159
1160# Directories & files removed with 'make mrproper'
1161MRPROPER_DIRS += include/config usr/include include/generated \
1162 arch/*/include/generated
1163MRPROPER_FILES += .config .config.old .version .old_version \
1164 include/linux/version.h \
1165 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1166
1167# clean - Delete most, but leave enough to build external modules
1168#
1169clean: rm-dirs := $(CLEAN_DIRS)
1170clean: rm-files := $(CLEAN_FILES)
1171clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1172
1173PHONY += $(clean-dirs) clean archclean
1174$(clean-dirs):
1175 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1176
1177clean: archclean
1178
1179# mrproper - Delete all generated files, including .config
1180#
1181mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1182mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1183mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1184
1185PHONY += $(mrproper-dirs) mrproper archmrproper
1186$(mrproper-dirs):
1187 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1188
1189mrproper: clean archmrproper $(mrproper-dirs)
1190 $(call cmd,rmdirs)
1191 $(call cmd,rmfiles)
1192
1193# distclean
1194#
1195PHONY += distclean
1196
1197distclean: mrproper
1198 @find $(srctree) $(RCS_FIND_IGNORE) \
1199 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1200 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1201 -o -name '.*.rej' -o -size 0 \
1202 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1203 -type f -print | xargs rm -f
1204
1205
1206# Packaging of the kernel to various formats
1207# ---------------------------------------------------------------------------
1208# rpm target kept for backward compatibility
1209package-dir := $(srctree)/scripts/package
1210
1211%src-pkg: FORCE
1212 $(Q)$(MAKE) $(build)=$(package-dir) $@
1213%pkg: include/config/kernel.release FORCE
1214 $(Q)$(MAKE) $(build)=$(package-dir) $@
1215rpm: include/config/kernel.release FORCE
1216 $(Q)$(MAKE) $(build)=$(package-dir) $@
1217
1218
1219# Brief documentation of the typical targets used
1220# ---------------------------------------------------------------------------
1221
1222boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1223boards := $(notdir $(boards))
1224board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1225board-dirs := $(sort $(notdir $(board-dirs:/=)))
1226
1227help:
1228 @echo 'Cleaning targets:'
1229 @echo ' clean - Remove most generated files but keep the config and'
1230 @echo ' enough build support to build external modules'
1231 @echo ' mrproper - Remove all generated files + config + various backup files'
1232 @echo ' distclean - mrproper + remove editor backup and patch files'
1233 @echo ''
1234 @echo 'Configuration targets:'
1235 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1236 @echo ''
1237 @echo 'Other generic targets:'
1238 @echo ' all - Build all targets marked with [*]'
1239 @echo '* vmlinux - Build the bare kernel'
1240 @echo '* modules - Build all modules'
1241 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1242 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1243 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1244 @echo ' dir/ - Build all files in dir and below'
1245 @echo ' dir/file.[oisS] - Build specified target only'
1246 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1247 @echo ' (requires a recent binutils and recent build (System.map))'
1248 @echo ' dir/file.ko - Build module including final link'
1249 @echo ' modules_prepare - Set up for building external modules'
1250 @echo ' tags/TAGS - Generate tags file for editors'
1251 @echo ' cscope - Generate cscope index'
1252 @echo ' gtags - Generate GNU GLOBAL index'
1253 @echo ' kernelrelease - Output the release version string'
1254 @echo ' kernelversion - Output the version stored in Makefile'
1255 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1256 echo ' (default: $(INSTALL_HDR_PATH))'; \
1257 echo ''
1258 @echo 'Static analysers'
1259 @echo ' checkstack - Generate a list of stack hogs'
1260 @echo ' namespacecheck - Name space analysis on compiled kernel'
1261 @echo ' versioncheck - Sanity check on version.h usage'
1262 @echo ' includecheck - Check for duplicate included header files'
1263 @echo ' export_report - List the usages of all exported symbols'
1264 @echo ' headers_check - Sanity check on exported headers'
1265 @echo ' headerdep - Detect inclusion cycles in headers'
1266 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1267 @echo ''
1268 @echo 'Kernel packaging:'
1269 @$(MAKE) $(build)=$(package-dir) help
1270 @echo ''
1271 @echo 'Documentation targets:'
1272 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1273 @echo ''
1274 @echo 'Architecture specific targets ($(SRCARCH)):'
1275 @$(if $(archhelp),$(archhelp),\
1276 echo ' No architecture specific help defined for $(SRCARCH)')
1277 @echo ''
1278 @$(if $(boards), \
1279 $(foreach b, $(boards), \
1280 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1281 echo '')
1282 @$(if $(board-dirs), \
1283 $(foreach b, $(board-dirs), \
1284 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1285 printf " %-16s - Show all of the above\\n" help-boards; \
1286 echo '')
1287
1288 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1289 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1290 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1291 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1292 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1293 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1294 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1295 @echo ' 1: warnings which may be relevant and do not occur too often'
1296 @echo ' 2: warnings which occur quite often but may still be relevant'
1297 @echo ' 3: more obscure warnings, can most likely be ignored'
1298 @echo ' Multiple levels can be combined with W=12 or W=123'
1299 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1300 @echo ''
1301 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1302 @echo 'For further info see the ./README file'
1303
1304
1305help-board-dirs := $(addprefix help-,$(board-dirs))
1306
1307help-boards: $(help-board-dirs)
1308
1309boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1310
1311$(help-board-dirs): help-%:
1312 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1313 @$(if $(boards-per-dir), \
1314 $(foreach b, $(boards-per-dir), \
1315 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1316 echo '')
1317
1318
1319# Documentation targets
1320# ---------------------------------------------------------------------------
1321%docs: scripts_basic FORCE
1322 $(Q)$(MAKE) $(build)=scripts build_docproc
1323 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1324
1325else # KBUILD_EXTMOD
1326
1327###
1328# External module support.
1329# When building external modules the kernel used as basis is considered
1330# read-only, and no consistency checks are made and the make
1331# system is not used on the basis kernel. If updates are required
1332# in the basis kernel ordinary make commands (without M=...) must
1333# be used.
1334#
1335# The following are the only valid targets when building external
1336# modules.
1337# make M=dir clean Delete all automatically generated files
1338# make M=dir modules Make all modules in specified dir
1339# make M=dir Same as 'make M=dir modules'
1340# make M=dir modules_install
1341# Install the modules built in the module directory
1342# Assumes install directory is already created
1343
1344# We are always building modules
1345KBUILD_MODULES := 1
1346PHONY += crmodverdir
1347crmodverdir:
1348 $(cmd_crmodverdir)
1349
1350PHONY += $(objtree)/Module.symvers
1351$(objtree)/Module.symvers:
1352 @test -e $(objtree)/Module.symvers || ( \
1353 echo; \
1354 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1355 echo " is missing; modules will have no dependencies and modversions."; \
1356 echo )
1357
1358module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1359PHONY += $(module-dirs) modules
1360$(module-dirs): crmodverdir $(objtree)/Module.symvers
1361 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1362
1363modules: $(module-dirs)
1364 @$(kecho) ' Building modules, stage 2.';
1365 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1366
1367PHONY += modules_install
1368modules_install: _emodinst_ _emodinst_post
1369
1370install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1371PHONY += _emodinst_
1372_emodinst_:
1373 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1374 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1375
1376PHONY += _emodinst_post
1377_emodinst_post: _emodinst_
1378 $(call cmd,depmod)
1379
1380clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1381
1382PHONY += $(clean-dirs) clean
1383$(clean-dirs):
1384 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1385
1386clean: rm-dirs := $(MODVERDIR)
1387clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1388
1389help:
1390 @echo ' Building external modules.'
1391 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1392 @echo ''
1393 @echo ' modules - default target, build the module(s)'
1394 @echo ' modules_install - install the module'
1395 @echo ' clean - remove generated files in module directory only'
1396 @echo ''
1397
1398# Dummies...
1399PHONY += prepare scripts
1400prepare: ;
1401scripts: ;
1402endif # KBUILD_EXTMOD
1403
1404clean: $(clean-dirs)
1405 $(call cmd,rmdirs)
1406 $(call cmd,rmfiles)
1407 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1408 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1409 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1410 -o -name '*.symtypes' -o -name 'modules.order' \
1411 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1412 -o -name '*.gcno' \) -type f -print | xargs rm -f
1413
1414# Generate tags for editors
1415# ---------------------------------------------------------------------------
1416quiet_cmd_tags = GEN $@
1417 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1418
1419tags TAGS cscope gtags: FORCE
1420 $(call cmd,tags)
1421
1422# Scripts to check various things for consistency
1423# ---------------------------------------------------------------------------
1424
1425PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1426
1427includecheck:
1428 find $(srctree)/* $(RCS_FIND_IGNORE) \
1429 -name '*.[hcS]' -type f -print | sort \
1430 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1431
1432versioncheck:
1433 find $(srctree)/* $(RCS_FIND_IGNORE) \
1434 -name '*.[hcS]' -type f -print | sort \
1435 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1436
1437coccicheck:
1438 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1439
1440namespacecheck:
1441 $(PERL) $(srctree)/scripts/namespace.pl
1442
1443export_report:
1444 $(PERL) $(srctree)/scripts/export_report.pl
1445
1446endif #ifeq ($(config-targets),1)
1447endif #ifeq ($(mixed-targets),1)
1448
1449PHONY += checkstack kernelrelease kernelversion
1450
1451# UML needs a little special treatment here. It wants to use the host
1452# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1453# else wants $(ARCH), including people doing cross-builds, which means
1454# that $(SUBARCH) doesn't work here.
1455ifeq ($(ARCH), um)
1456CHECKSTACK_ARCH := $(SUBARCH)
1457else
1458CHECKSTACK_ARCH := $(ARCH)
1459endif
1460checkstack:
1461 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1462 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1463
1464kernelrelease:
1465 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1466
1467kernelversion:
1468 @echo $(KERNELVERSION)
1469
1470# Single targets
1471# ---------------------------------------------------------------------------
1472# Single targets are compatible with:
1473# - build with mixed source and output
1474# - build with separate output dir 'make O=...'
1475# - external modules
1476#
1477# target-dir => where to store outputfile
1478# build-dir => directory in kernel source tree to use
1479
1480ifeq ($(KBUILD_EXTMOD),)
1481 build-dir = $(patsubst %/,%,$(dir $@))
1482 target-dir = $(dir $@)
1483else
1484 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1485 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1486 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1487endif
1488
1489%.s: %.c prepare scripts FORCE
1490 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1491%.i: %.c prepare scripts FORCE
1492 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493%.o: %.c prepare scripts FORCE
1494 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495%.lst: %.c prepare scripts FORCE
1496 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497%.s: %.S prepare scripts FORCE
1498 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499%.o: %.S prepare scripts FORCE
1500 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501%.symtypes: %.c prepare scripts FORCE
1502 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1503
1504# Modules
1505/: prepare scripts FORCE
1506 $(cmd_crmodverdir)
1507 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1508 $(build)=$(build-dir)
1509%/: prepare scripts FORCE
1510 $(cmd_crmodverdir)
1511 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1512 $(build)=$(build-dir)
1513%.ko: prepare scripts FORCE
1514 $(cmd_crmodverdir)
1515 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1516 $(build)=$(build-dir) $(@:.ko=.o)
1517 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1518
1519# FIXME Should go into a make.lib or something
1520# ===========================================================================
1521
1522quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1523 cmd_rmdirs = rm -rf $(rm-dirs)
1524
1525quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1526 cmd_rmfiles = rm -f $(rm-files)
1527
1528# Run depmod only if we have System.map and depmod is executable
1529quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1530 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1531 $(KERNELRELEASE)
1532
1533# Create temporary dir for module support files
1534# clean it up only when building all modules
1535cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1536 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1537
1538a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1539 $(KBUILD_AFLAGS_KERNEL) \
1540 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1541 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1542
1543quiet_cmd_as_o_S = AS $@
1544cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1545
1546# read all saved command lines
1547
1548targets := $(wildcard $(sort $(targets)))
1549cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1550
1551ifneq ($(cmd_files),)
1552 $(cmd_files): ; # Do not try to update included dependency files
1553 include $(cmd_files)
1554endif
1555
1556# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1557# Usage:
1558# $(Q)$(MAKE) $(clean)=dir
1559clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1560
1561endif # skip-makefile
1562
1563PHONY += FORCE
1564FORCE:
1565
1566# Declare the contents of the .PHONY variable as phony. We keep that
1567# information in a variable so we can use it in if_changed and friends.
1568.PHONY: $(PHONY)
1VERSION = 4
2PATCHLEVEL = 6
3SUBLEVEL = 0
4EXTRAVERSION =
5NAME = Charred Weasel
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# o Do not use make's built-in rules and variables
14# (this increases performance and avoids hard-to-debug behaviour);
15# o Look for make include files relative to root of kernel src
16MAKEFLAGS += -rR --include-dir=$(CURDIR)
17
18# Avoid funny character set dependencies
19unexport LC_ALL
20LC_COLLATE=C
21LC_NUMERIC=C
22export LC_COLLATE LC_NUMERIC
23
24# Avoid interference with shell env settings
25unexport GREP_OPTIONS
26
27# We are using a recursive build, so we need to do a little thinking
28# to get the ordering right.
29#
30# Most importantly: sub-Makefiles should only ever modify files in
31# their own directory. If in some directory we have a dependency on
32# a file in another dir (which doesn't happen often, but it's often
33# unavoidable when linking the built-in.o targets which finally
34# turn into vmlinux), we will call a sub make in that other dir, and
35# after that we are sure that everything which is in that other dir
36# is now up to date.
37#
38# The only cases where we need to modify files which have global
39# effects are thus separated out and done before the recursive
40# descending is started. They are now explicitly listed as the
41# prepare rule.
42
43# Beautify output
44# ---------------------------------------------------------------------------
45#
46# Normally, we echo the whole command before executing it. By making
47# that echo $($(quiet)$(cmd)), we now have the possibility to set
48# $(quiet) to choose other forms of output instead, e.g.
49#
50# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
52#
53# If $(quiet) is empty, the whole command will be printed.
54# If it is set to "quiet_", only the short version will be printed.
55# If it is set to "silent_", nothing will be printed at all, since
56# the variable $(silent_cmd_cc_o_c) doesn't exist.
57#
58# A simple variant is to prefix commands with $(Q) - that's useful
59# for commands that shall be hidden in non-verbose mode.
60#
61# $(Q)ln $@ :<
62#
63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
65#
66# To put more focus on warnings, be less verbose as default
67# Use 'make V=1' to see the full commands
68
69ifeq ("$(origin V)", "command line")
70 KBUILD_VERBOSE = $(V)
71endif
72ifndef KBUILD_VERBOSE
73 KBUILD_VERBOSE = 0
74endif
75
76ifeq ($(KBUILD_VERBOSE),1)
77 quiet =
78 Q =
79else
80 quiet=quiet_
81 Q = @
82endif
83
84# If the user is running make -s (silent mode), suppress echoing of
85# commands
86
87ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89 quiet=silent_
90endif
91else # make-3.8x
92ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
93 quiet=silent_
94endif
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
104#
105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
114# KBUILD_SRC is set on invocation of make in OBJ directory
115# KBUILD_SRC is not intended to be used by the regular user (for now)
116ifeq ($(KBUILD_SRC),)
117
118# OK, Make called in directory where kernel src resides
119# Do we want to locate output files in a separate directory?
120ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
122endif
123
124# That's our default target when none is given on the command line
125PHONY := _all
126_all:
127
128# Cancel implicit rules on top Makefile
129$(CURDIR)/Makefile Makefile: ;
130
131ifneq ($(KBUILD_OUTPUT),)
132# Invoke a second make in the output directory, passing relevant variables
133# check that the output directory actually exists
134saved-output := $(KBUILD_OUTPUT)
135KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
136 && /bin/pwd)
137$(if $(KBUILD_OUTPUT),, \
138 $(error failed to create output directory "$(saved-output)"))
139
140PHONY += $(MAKECMDGOALS) sub-make
141
142$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
143 @:
144
145sub-make: FORCE
146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
148
149# Leave processing to above invocation of make
150skip-makefile := 1
151endif # ifneq ($(KBUILD_OUTPUT),)
152endif # ifeq ($(KBUILD_SRC),)
153
154# We process the rest of the Makefile if this is the final invocation of make
155ifeq ($(skip-makefile),)
156
157# Do not print "Entering directory ...",
158# but we want to display it when entering to the output directory
159# so that IDEs/editors are able to understand relative filenames.
160MAKEFLAGS += --no-print-directory
161
162# Call a source code checker (by default, "sparse") as part of the
163# C compilation.
164#
165# Use 'make C=1' to enable checking of only re-compiled files.
166# Use 'make C=2' to enable checking of *all* source files, regardless
167# of whether they are re-compiled or not.
168#
169# See the file "Documentation/sparse.txt" for more details, including
170# where to get the "sparse" utility.
171
172ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC = $(C)
174endif
175ifndef KBUILD_CHECKSRC
176 KBUILD_CHECKSRC = 0
177endif
178
179# Use make M=dir to specify directory of external module to build
180# Old syntax make ... SUBDIRS=$PWD is still supported
181# Setting the environment variable KBUILD_EXTMOD take precedence
182ifdef SUBDIRS
183 KBUILD_EXTMOD ?= $(SUBDIRS)
184endif
185
186ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD := $(M)
188endif
189
190# If building an external module we do not care about the all: rule
191# but instead _all depend on modules
192PHONY += all
193ifeq ($(KBUILD_EXTMOD),)
194_all: all
195else
196_all: modules
197endif
198
199ifeq ($(KBUILD_SRC),)
200 # building in the source tree
201 srctree := .
202else
203 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
204 # building in a subdirectory of the source tree
205 srctree := ..
206 else
207 srctree := $(KBUILD_SRC)
208 endif
209endif
210objtree := .
211src := $(srctree)
212obj := $(objtree)
213
214VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
215
216export srctree objtree VPATH
217
218# SUBARCH tells the usermode build what the underlying arch is. That is set
219# first, and if a usermode build is happening, the "ARCH=um" on the command
220# line overrides the setting of ARCH below. If a native build is happening,
221# then ARCH is assigned, getting whatever value it gets normally, and
222# SUBARCH is subsequently ignored.
223
224SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86 \
225 -e s/sun4u/sparc64/ \
226 -e s/arm.*/arm/ -e s/sa110/arm/ \
227 -e s/s390x/s390/ -e s/parisc64/parisc/ \
228 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
229 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
230
231# Cross compiling and selecting different set of gcc/bin-utils
232# ---------------------------------------------------------------------------
233#
234# When performing cross compilation for other architectures ARCH shall be set
235# to the target architecture. (See arch/* for the possibilities).
236# ARCH can be set during invocation of make:
237# make ARCH=ia64
238# Another way is to have ARCH set in the environment.
239# The default ARCH is the host where make is executed.
240
241# CROSS_COMPILE specify the prefix used for all executables used
242# during compilation. Only gcc and related bin-utils executables
243# are prefixed with $(CROSS_COMPILE).
244# CROSS_COMPILE can be set on the command line
245# make CROSS_COMPILE=ia64-linux-
246# Alternatively CROSS_COMPILE can be set in the environment.
247# A third alternative is to store a setting in .config so that plain
248# "make" in the configured kernel build directory always uses that.
249# Default value for CROSS_COMPILE is not to prefix executables
250# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
251ARCH ?= $(SUBARCH)
252CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
253
254# Architecture as present in compile.h
255UTS_MACHINE := $(ARCH)
256SRCARCH := $(ARCH)
257
258# Additional ARCH settings for x86
259ifeq ($(ARCH),i386)
260 SRCARCH := x86
261endif
262ifeq ($(ARCH),x86_64)
263 SRCARCH := x86
264endif
265
266# Additional ARCH settings for sparc
267ifeq ($(ARCH),sparc32)
268 SRCARCH := sparc
269endif
270ifeq ($(ARCH),sparc64)
271 SRCARCH := sparc
272endif
273
274# Additional ARCH settings for sh
275ifeq ($(ARCH),sh64)
276 SRCARCH := sh
277endif
278
279# Additional ARCH settings for tile
280ifeq ($(ARCH),tilepro)
281 SRCARCH := tile
282endif
283ifeq ($(ARCH),tilegx)
284 SRCARCH := tile
285endif
286
287# Where to locate arch specific headers
288hdr-arch := $(SRCARCH)
289
290KCONFIG_CONFIG ?= .config
291export KCONFIG_CONFIG
292
293# SHELL used by kbuild
294CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
295 else if [ -x /bin/bash ]; then echo /bin/bash; \
296 else echo sh; fi ; fi)
297
298HOSTCC = gcc
299HOSTCXX = g++
300HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
301HOSTCXXFLAGS = -O2
302
303ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
304HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
305 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
306endif
307
308# Decide whether to build built-in, modular, or both.
309# Normally, just do built-in.
310
311KBUILD_MODULES :=
312KBUILD_BUILTIN := 1
313
314# If we have only "make modules", don't compile built-in objects.
315# When we're building modules with modversions, we need to consider
316# the built-in objects during the descend as well, in order to
317# make sure the checksums are up to date before we record them.
318
319ifeq ($(MAKECMDGOALS),modules)
320 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
321endif
322
323# If we have "make <whatever> modules", compile modules
324# in addition to whatever we do anyway.
325# Just "make" or "make all" shall build modules as well
326
327ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
328 KBUILD_MODULES := 1
329endif
330
331ifeq ($(MAKECMDGOALS),)
332 KBUILD_MODULES := 1
333endif
334
335export KBUILD_MODULES KBUILD_BUILTIN
336export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
337
338# We need some generic definitions (do not try to remake the file).
339scripts/Kbuild.include: ;
340include scripts/Kbuild.include
341
342# Make variables (CC, etc...)
343AS = $(CROSS_COMPILE)as
344LD = $(CROSS_COMPILE)ld
345CC = $(CROSS_COMPILE)gcc
346CPP = $(CC) -E
347AR = $(CROSS_COMPILE)ar
348NM = $(CROSS_COMPILE)nm
349STRIP = $(CROSS_COMPILE)strip
350OBJCOPY = $(CROSS_COMPILE)objcopy
351OBJDUMP = $(CROSS_COMPILE)objdump
352AWK = awk
353GENKSYMS = scripts/genksyms/genksyms
354INSTALLKERNEL := installkernel
355DEPMOD = /sbin/depmod
356PERL = perl
357PYTHON = python
358CHECK = sparse
359
360CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
361 -Wbitwise -Wno-return-void $(CF)
362CFLAGS_MODULE =
363AFLAGS_MODULE =
364LDFLAGS_MODULE =
365CFLAGS_KERNEL =
366AFLAGS_KERNEL =
367CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
368CFLAGS_KCOV = -fsanitize-coverage=trace-pc
369
370
371# Use USERINCLUDE when you must reference the UAPI directories only.
372USERINCLUDE := \
373 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
374 -Iarch/$(hdr-arch)/include/generated/uapi \
375 -I$(srctree)/include/uapi \
376 -Iinclude/generated/uapi \
377 -include $(srctree)/include/linux/kconfig.h
378
379# Use LINUXINCLUDE when you must reference the include/ directory.
380# Needed to be compatible with the O= option
381LINUXINCLUDE := \
382 -I$(srctree)/arch/$(hdr-arch)/include \
383 -Iarch/$(hdr-arch)/include/generated/uapi \
384 -Iarch/$(hdr-arch)/include/generated \
385 $(if $(KBUILD_SRC), -I$(srctree)/include) \
386 -Iinclude \
387 $(USERINCLUDE)
388
389KBUILD_CPPFLAGS := -D__KERNEL__
390
391KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
392 -fno-strict-aliasing -fno-common \
393 -Werror-implicit-function-declaration \
394 -Wno-format-security \
395 -std=gnu89
396
397KBUILD_AFLAGS_KERNEL :=
398KBUILD_CFLAGS_KERNEL :=
399KBUILD_AFLAGS := -D__ASSEMBLY__
400KBUILD_AFLAGS_MODULE := -DMODULE
401KBUILD_CFLAGS_MODULE := -DMODULE
402KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
403
404# Read KERNELRELEASE from include/config/kernel.release (if it exists)
405KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
406KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
407
408export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
409export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
410export CPP AR NM STRIP OBJCOPY OBJDUMP
411export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
412export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
413
414export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
415export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
416export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
417export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
418export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
419export KBUILD_ARFLAGS
420
421# When compiling out-of-tree modules, put MODVERDIR in the module
422# tree rather than in the kernel tree. The kernel tree might
423# even be read-only.
424export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
425
426# Files to ignore in find ... statements
427
428export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
429 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
430 -prune -o
431export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
432 --exclude CVS --exclude .pc --exclude .hg --exclude .git
433
434# ===========================================================================
435# Rules shared between *config targets and build targets
436
437# Basic helpers built in scripts
438PHONY += scripts_basic
439scripts_basic:
440 $(Q)$(MAKE) $(build)=scripts/basic
441 $(Q)rm -f .tmp_quiet_recordmcount
442
443# To avoid any implicit rule to kick in, define an empty command.
444scripts/basic/%: scripts_basic ;
445
446PHONY += outputmakefile
447# outputmakefile generates a Makefile in the output directory, if using a
448# separate output directory. This allows convenient use of make in the
449# output directory.
450outputmakefile:
451ifneq ($(KBUILD_SRC),)
452 $(Q)ln -fsn $(srctree) source
453 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
454 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
455endif
456
457# Support for using generic headers in asm-generic
458PHONY += asm-generic
459asm-generic:
460 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
461 src=asm obj=arch/$(SRCARCH)/include/generated/asm
462 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
463 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
464
465# To make sure we do not include .config for any of the *config targets
466# catch them early, and hand them over to scripts/kconfig/Makefile
467# It is allowed to specify more targets when calling make, including
468# mixing *config targets and build targets.
469# For example 'make oldconfig all'.
470# Detect when mixed targets is specified, and make a second invocation
471# of make so .config is not included in this case either (for *config).
472
473version_h := include/generated/uapi/linux/version.h
474old_version_h := include/linux/version.h
475
476no-dot-config-targets := clean mrproper distclean \
477 cscope gtags TAGS tags help% %docs check% coccicheck \
478 $(version_h) headers_% archheaders archscripts \
479 kernelversion %src-pkg
480
481config-targets := 0
482mixed-targets := 0
483dot-config := 1
484
485ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
486 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
487 dot-config := 0
488 endif
489endif
490
491ifeq ($(KBUILD_EXTMOD),)
492 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
493 config-targets := 1
494 ifneq ($(words $(MAKECMDGOALS)),1)
495 mixed-targets := 1
496 endif
497 endif
498endif
499# install and module_install need also be processed one by one
500ifneq ($(filter install,$(MAKECMDGOALS)),)
501 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
502 mixed-targets := 1
503 endif
504endif
505
506ifeq ($(mixed-targets),1)
507# ===========================================================================
508# We're called with mixed targets (*config and build targets).
509# Handle them one by one.
510
511PHONY += $(MAKECMDGOALS) __build_one_by_one
512
513$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
514 @:
515
516__build_one_by_one:
517 $(Q)set -e; \
518 for i in $(MAKECMDGOALS); do \
519 $(MAKE) -f $(srctree)/Makefile $$i; \
520 done
521
522else
523ifeq ($(config-targets),1)
524# ===========================================================================
525# *config targets only - make sure prerequisites are updated, and descend
526# in scripts/kconfig to make the *config target
527
528# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
529# KBUILD_DEFCONFIG may point out an alternative default configuration
530# used for 'make defconfig'
531include arch/$(SRCARCH)/Makefile
532export KBUILD_DEFCONFIG KBUILD_KCONFIG
533
534config: scripts_basic outputmakefile FORCE
535 $(Q)$(MAKE) $(build)=scripts/kconfig $@
536
537%config: scripts_basic outputmakefile FORCE
538 $(Q)$(MAKE) $(build)=scripts/kconfig $@
539
540else
541# ===========================================================================
542# Build targets only - this includes vmlinux, arch specific targets, clean
543# targets and others. In general all targets except *config targets.
544
545ifeq ($(KBUILD_EXTMOD),)
546# Additional helpers built in scripts
547# Carefully list dependencies so we do not try to build scripts twice
548# in parallel
549PHONY += scripts
550scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
551 asm-generic
552 $(Q)$(MAKE) $(build)=$(@)
553
554# Objects we will link into vmlinux / subdirs we need to visit
555init-y := init
556drivers-y := drivers sound firmware
557net-y := net
558libs-y := lib
559core-y := usr
560virt-y := virt
561endif # KBUILD_EXTMOD
562
563ifeq ($(dot-config),1)
564# Read in config
565-include include/config/auto.conf
566
567ifeq ($(KBUILD_EXTMOD),)
568# Read in dependencies to all Kconfig* files, make sure to run
569# oldconfig if changes are detected.
570-include include/config/auto.conf.cmd
571
572# To avoid any implicit rule to kick in, define an empty command
573$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
574
575# If .config is newer than include/config/auto.conf, someone tinkered
576# with it and forgot to run make oldconfig.
577# if auto.conf.cmd is missing then we are probably in a cleaned tree so
578# we execute the config step to be sure to catch updated Kconfig files
579include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
580 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
581else
582# external modules needs include/generated/autoconf.h and include/config/auto.conf
583# but do not care if they are up-to-date. Use auto.conf to trigger the test
584PHONY += include/config/auto.conf
585
586include/config/auto.conf:
587 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
588 echo >&2; \
589 echo >&2 " ERROR: Kernel configuration is invalid."; \
590 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
591 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
592 echo >&2 ; \
593 /bin/false)
594
595endif # KBUILD_EXTMOD
596
597else
598# Dummy target needed, because used as prerequisite
599include/config/auto.conf: ;
600endif # $(dot-config)
601
602# The all: target is the default when no target is given on the
603# command line.
604# This allow a user to issue only 'make' to build a kernel including modules
605# Defaults to vmlinux, but the arch makefile usually adds further targets
606all: vmlinux
607
608# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
609# values of the respective KBUILD_* variables
610ARCH_CPPFLAGS :=
611ARCH_AFLAGS :=
612ARCH_CFLAGS :=
613include arch/$(SRCARCH)/Makefile
614
615KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
616
617ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
618KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
619else
620KBUILD_CFLAGS += -O2
621endif
622
623# Tell gcc to never replace conditional load with a non-conditional one
624KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
625
626ifdef CONFIG_READABLE_ASM
627# Disable optimizations that make assembler listings hard to read.
628# reorder blocks reorders the control in the function
629# ipa clone creates specialized cloned functions
630# partial inlining inlines only parts of functions
631KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
632 $(call cc-option,-fno-ipa-cp-clone,) \
633 $(call cc-option,-fno-partial-inlining)
634endif
635
636ifneq ($(CONFIG_FRAME_WARN),0)
637KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
638endif
639
640# Handle stack protector mode.
641#
642# Since kbuild can potentially perform two passes (first with the old
643# .config values and then with updated .config values), we cannot error out
644# if a desired compiler option is unsupported. If we were to error, kbuild
645# could never get to the second pass and actually notice that we changed
646# the option to something that was supported.
647#
648# Additionally, we don't want to fallback and/or silently change which compiler
649# flags will be used, since that leads to producing kernels with different
650# security feature characteristics depending on the compiler used. ("But I
651# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
652#
653# The middle ground is to warn here so that the failed option is obvious, but
654# to let the build fail with bad compiler flags so that we can't produce a
655# kernel when there is a CONFIG and compiler mismatch.
656#
657ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
658 stackp-flag := -fstack-protector
659 ifeq ($(call cc-option, $(stackp-flag)),)
660 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
661 -fstack-protector not supported by compiler)
662 endif
663else
664ifdef CONFIG_CC_STACKPROTECTOR_STRONG
665 stackp-flag := -fstack-protector-strong
666 ifeq ($(call cc-option, $(stackp-flag)),)
667 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
668 -fstack-protector-strong not supported by compiler)
669 endif
670else
671 # Force off for distro compilers that enable stack protector by default.
672 stackp-flag := $(call cc-option, -fno-stack-protector)
673endif
674endif
675KBUILD_CFLAGS += $(stackp-flag)
676
677ifdef CONFIG_KCOV
678 ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
679 $(warning Cannot use CONFIG_KCOV: \
680 -fsanitize-coverage=trace-pc is not supported by compiler)
681 CFLAGS_KCOV =
682 endif
683endif
684
685ifeq ($(cc-name),clang)
686KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
687KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
688KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
689KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
690KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
691# Quiet clang warning: comparison of unsigned expression < 0 is always false
692KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
693# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
694# source of a reference will be _MergedGlobals and not on of the whitelisted names.
695# See modpost pattern 2
696KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
697KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
698else
699
700# This warning generated too much noise in a regular build.
701# Use make W=1 to enable this warning (see scripts/Makefile.build)
702KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
703endif
704
705ifdef CONFIG_FRAME_POINTER
706KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
707else
708# Some targets (ARM with Thumb2, for example), can't be built with frame
709# pointers. For those, we don't have FUNCTION_TRACER automatically
710# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
711# incompatible with -fomit-frame-pointer with current GCC, so we don't use
712# -fomit-frame-pointer with FUNCTION_TRACER.
713ifndef CONFIG_FUNCTION_TRACER
714KBUILD_CFLAGS += -fomit-frame-pointer
715endif
716endif
717
718KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
719
720ifdef CONFIG_DEBUG_INFO
721ifdef CONFIG_DEBUG_INFO_SPLIT
722KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
723else
724KBUILD_CFLAGS += -g
725endif
726KBUILD_AFLAGS += -Wa,-gdwarf-2
727endif
728ifdef CONFIG_DEBUG_INFO_DWARF4
729KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
730endif
731
732ifdef CONFIG_DEBUG_INFO_REDUCED
733KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
734 $(call cc-option,-fno-var-tracking)
735endif
736
737ifdef CONFIG_FUNCTION_TRACER
738ifndef CC_FLAGS_FTRACE
739CC_FLAGS_FTRACE := -pg
740endif
741export CC_FLAGS_FTRACE
742ifdef CONFIG_HAVE_FENTRY
743CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
744endif
745KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
746KBUILD_AFLAGS += $(CC_USING_FENTRY)
747ifdef CONFIG_DYNAMIC_FTRACE
748 ifdef CONFIG_HAVE_C_RECORDMCOUNT
749 BUILD_C_RECORDMCOUNT := y
750 export BUILD_C_RECORDMCOUNT
751 endif
752endif
753endif
754
755# We trigger additional mismatches with less inlining
756ifdef CONFIG_DEBUG_SECTION_MISMATCH
757KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
758endif
759
760# arch Makefile may override CC so keep this after arch Makefile is included
761NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
762CHECKFLAGS += $(NOSTDINC_FLAGS)
763
764# warn about C99 declaration after statement
765KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
766
767# disable pointer signed / unsigned warnings in gcc 4.0
768KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
769
770# disable invalid "can't wrap" optimizations for signed / pointers
771KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
772
773# conserve stack if available
774KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
775
776# disallow errors like 'EXPORT_GPL(foo);' with missing header
777KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
778
779# require functions to have arguments in prototypes, not empty 'int foo()'
780KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
781
782# Prohibit date/time macros, which would make the build non-deterministic
783KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
784
785# enforce correct pointer usage
786KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
787
788# use the deterministic mode of AR if available
789KBUILD_ARFLAGS := $(call ar-option,D)
790
791# check for 'asm goto'
792ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
793 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
794 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
795endif
796
797include scripts/Makefile.kasan
798include scripts/Makefile.extrawarn
799include scripts/Makefile.ubsan
800
801# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
802# last assignments
803KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
804KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
805KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
806
807# Use --build-id when available.
808LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
809 $(call cc-ldoption, -Wl$(comma)--build-id,))
810KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
811LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
812
813ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
814LDFLAGS_vmlinux += $(call ld-option, -X,)
815endif
816
817# Default kernel image to build when no specific target is given.
818# KBUILD_IMAGE may be overruled on the command line or
819# set in the environment
820# Also any assignments in arch/$(ARCH)/Makefile take precedence over
821# this default value
822export KBUILD_IMAGE ?= vmlinux
823
824#
825# INSTALL_PATH specifies where to place the updated kernel and system map
826# images. Default is /boot, but you can set it to other values
827export INSTALL_PATH ?= /boot
828
829#
830# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
831# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
832# an argument if needed. Otherwise it defaults to the kernel install path
833#
834export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
835
836#
837# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
838# relocations required by build roots. This is not defined in the
839# makefile but the argument can be passed to make if needed.
840#
841
842MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
843export MODLIB
844
845#
846# INSTALL_MOD_STRIP, if defined, will cause modules to be
847# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
848# the default option --strip-debug will be used. Otherwise,
849# INSTALL_MOD_STRIP value will be used as the options to the strip command.
850
851ifdef INSTALL_MOD_STRIP
852ifeq ($(INSTALL_MOD_STRIP),1)
853mod_strip_cmd = $(STRIP) --strip-debug
854else
855mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
856endif # INSTALL_MOD_STRIP=1
857else
858mod_strip_cmd = true
859endif # INSTALL_MOD_STRIP
860export mod_strip_cmd
861
862# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
863# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
864# or CONFIG_MODULE_COMPRESS_XZ.
865
866mod_compress_cmd = true
867ifdef CONFIG_MODULE_COMPRESS
868 ifdef CONFIG_MODULE_COMPRESS_GZIP
869 mod_compress_cmd = gzip -n -f
870 endif # CONFIG_MODULE_COMPRESS_GZIP
871 ifdef CONFIG_MODULE_COMPRESS_XZ
872 mod_compress_cmd = xz -f
873 endif # CONFIG_MODULE_COMPRESS_XZ
874endif # CONFIG_MODULE_COMPRESS
875export mod_compress_cmd
876
877# Select initial ramdisk compression format, default is gzip(1).
878# This shall be used by the dracut(8) tool while creating an initramfs image.
879#
880INITRD_COMPRESS-y := gzip
881INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
882INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
883INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
884INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
885INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
886# do not export INITRD_COMPRESS, since we didn't actually
887# choose a sane default compression above.
888# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
889
890ifdef CONFIG_MODULE_SIG_ALL
891$(eval $(call config_filename,MODULE_SIG_KEY))
892
893mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
894else
895mod_sign_cmd = true
896endif
897export mod_sign_cmd
898
899
900ifeq ($(KBUILD_EXTMOD),)
901core-y += kernel certs mm fs ipc security crypto block
902
903vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
904 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
905 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
906
907vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
908 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
909
910init-y := $(patsubst %/, %/built-in.o, $(init-y))
911core-y := $(patsubst %/, %/built-in.o, $(core-y))
912drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
913net-y := $(patsubst %/, %/built-in.o, $(net-y))
914libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
915libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
916libs-y := $(libs-y1) $(libs-y2)
917virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
918
919# Externally visible symbols (used by link-vmlinux.sh)
920export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
921export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
922export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
923export LDFLAGS_vmlinux
924# used by scripts/pacmage/Makefile
925export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
926
927vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
928
929# Final link of vmlinux
930 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
931quiet_cmd_link-vmlinux = LINK $@
932
933# Include targets which we want to
934# execute if the rest of the kernel build went well.
935vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
936ifdef CONFIG_HEADERS_CHECK
937 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
938endif
939ifdef CONFIG_SAMPLES
940 $(Q)$(MAKE) $(build)=samples
941endif
942ifdef CONFIG_BUILD_DOCSRC
943 $(Q)$(MAKE) $(build)=Documentation
944endif
945ifdef CONFIG_GDB_SCRIPTS
946 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
947endif
948 +$(call if_changed,link-vmlinux)
949
950# The actual objects are generated when descending,
951# make sure no implicit rule kicks in
952$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
953
954# Handle descending into subdirectories listed in $(vmlinux-dirs)
955# Preset locale variables to speed up the build process. Limit locale
956# tweaks to this spot to avoid wrong language settings when running
957# make menuconfig etc.
958# Error messages still appears in the original language
959
960PHONY += $(vmlinux-dirs)
961$(vmlinux-dirs): prepare scripts
962 $(Q)$(MAKE) $(build)=$@
963
964define filechk_kernel.release
965 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
966endef
967
968# Store (new) KERNELRELEASE string in include/config/kernel.release
969include/config/kernel.release: include/config/auto.conf FORCE
970 $(call filechk,kernel.release)
971
972
973# Things we need to do before we recursively start building the kernel
974# or the modules are listed in "prepare".
975# A multi level approach is used. prepareN is processed before prepareN-1.
976# archprepare is used in arch Makefiles and when processed asm symlink,
977# version.h and scripts_basic is processed / created.
978
979# Listed in dependency order
980PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
981
982# prepare3 is used to check if we are building in a separate output directory,
983# and if so do:
984# 1) Check that make has not been executed in the kernel src $(srctree)
985prepare3: include/config/kernel.release
986ifneq ($(KBUILD_SRC),)
987 @$(kecho) ' Using $(srctree) as source for kernel'
988 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
989 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
990 echo >&2 " in the '$(srctree)' directory.";\
991 /bin/false; \
992 fi;
993endif
994
995# prepare2 creates a makefile if using a separate output directory
996prepare2: prepare3 outputmakefile asm-generic
997
998prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
999 include/config/auto.conf
1000 $(cmd_crmodverdir)
1001
1002archprepare: archheaders archscripts prepare1 scripts_basic
1003
1004prepare0: archprepare FORCE
1005 $(Q)$(MAKE) $(build)=.
1006
1007# All the preparing..
1008prepare: prepare0 prepare-objtool
1009
1010ifdef CONFIG_STACK_VALIDATION
1011 has_libelf := $(call try-run,\
1012 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1013 ifeq ($(has_libelf),1)
1014 objtool_target := tools/objtool FORCE
1015 else
1016 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev or elfutils-libelf-devel")
1017 SKIP_STACK_VALIDATION := 1
1018 export SKIP_STACK_VALIDATION
1019 endif
1020endif
1021
1022PHONY += prepare-objtool
1023prepare-objtool: $(objtool_target)
1024
1025# Generate some files
1026# ---------------------------------------------------------------------------
1027
1028# KERNELRELEASE can change from a few different places, meaning version.h
1029# needs to be updated, so this check is forced on all builds
1030
1031uts_len := 64
1032define filechk_utsrelease.h
1033 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1034 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1035 exit 1; \
1036 fi; \
1037 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1038endef
1039
1040define filechk_version.h
1041 (echo \#define LINUX_VERSION_CODE $(shell \
1042 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1043 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1044endef
1045
1046$(version_h): $(srctree)/Makefile FORCE
1047 $(call filechk,version.h)
1048 $(Q)rm -f $(old_version_h)
1049
1050include/generated/utsrelease.h: include/config/kernel.release FORCE
1051 $(call filechk,utsrelease.h)
1052
1053PHONY += headerdep
1054headerdep:
1055 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1056 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1057
1058# ---------------------------------------------------------------------------
1059# Firmware install
1060INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1061export INSTALL_FW_PATH
1062
1063PHONY += firmware_install
1064firmware_install: FORCE
1065 @mkdir -p $(objtree)/firmware
1066 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1067
1068# ---------------------------------------------------------------------------
1069# Kernel headers
1070
1071#Default location for installed headers
1072export INSTALL_HDR_PATH = $(objtree)/usr
1073
1074# If we do an all arch process set dst to asm-$(hdr-arch)
1075hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1076
1077PHONY += archheaders
1078archheaders:
1079
1080PHONY += archscripts
1081archscripts:
1082
1083PHONY += __headers
1084__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1085 $(Q)$(MAKE) $(build)=scripts build_unifdef
1086
1087PHONY += headers_install_all
1088headers_install_all:
1089 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1090
1091PHONY += headers_install
1092headers_install: __headers
1093 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1094 $(error Headers not exportable for the $(SRCARCH) architecture))
1095 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1096 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1097
1098PHONY += headers_check_all
1099headers_check_all: headers_install_all
1100 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1101
1102PHONY += headers_check
1103headers_check: headers_install
1104 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1105 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1106
1107# ---------------------------------------------------------------------------
1108# Kernel selftest
1109
1110PHONY += kselftest
1111kselftest:
1112 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1113
1114kselftest-clean:
1115 $(Q)$(MAKE) -C tools/testing/selftests clean
1116
1117PHONY += kselftest-merge
1118kselftest-merge:
1119 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1120 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1121 -m $(objtree)/.config \
1122 $(srctree)/tools/testing/selftests/*/config
1123 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1124
1125# ---------------------------------------------------------------------------
1126# Modules
1127
1128ifdef CONFIG_MODULES
1129
1130# By default, build modules as well
1131
1132all: modules
1133
1134# Build modules
1135#
1136# A module can be listed more than once in obj-m resulting in
1137# duplicate lines in modules.order files. Those are removed
1138# using awk while concatenating to the final file.
1139
1140PHONY += modules
1141modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1142 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1143 @$(kecho) ' Building modules, stage 2.';
1144 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1145 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1146
1147modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1148 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1149
1150%/modules.builtin: include/config/auto.conf
1151 $(Q)$(MAKE) $(modbuiltin)=$*
1152
1153
1154# Target to prepare building external modules
1155PHONY += modules_prepare
1156modules_prepare: prepare scripts
1157
1158# Target to install modules
1159PHONY += modules_install
1160modules_install: _modinst_ _modinst_post
1161
1162PHONY += _modinst_
1163_modinst_:
1164 @rm -rf $(MODLIB)/kernel
1165 @rm -f $(MODLIB)/source
1166 @mkdir -p $(MODLIB)/kernel
1167 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1168 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1169 rm -f $(MODLIB)/build ; \
1170 ln -s $(CURDIR) $(MODLIB)/build ; \
1171 fi
1172 @cp -f $(objtree)/modules.order $(MODLIB)/
1173 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1174 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1175
1176# This depmod is only for convenience to give the initial
1177# boot a modules.dep even before / is mounted read-write. However the
1178# boot script depmod is the master version.
1179PHONY += _modinst_post
1180_modinst_post: _modinst_
1181 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1182 $(call cmd,depmod)
1183
1184ifeq ($(CONFIG_MODULE_SIG), y)
1185PHONY += modules_sign
1186modules_sign:
1187 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1188endif
1189
1190else # CONFIG_MODULES
1191
1192# Modules not configured
1193# ---------------------------------------------------------------------------
1194
1195modules modules_install: FORCE
1196 @echo >&2
1197 @echo >&2 "The present kernel configuration has modules disabled."
1198 @echo >&2 "Type 'make config' and enable loadable module support."
1199 @echo >&2 "Then build a kernel with module support enabled."
1200 @echo >&2
1201 @exit 1
1202
1203endif # CONFIG_MODULES
1204
1205###
1206# Cleaning is done on three levels.
1207# make clean Delete most generated files
1208# Leave enough to build external modules
1209# make mrproper Delete the current configuration, and all generated files
1210# make distclean Remove editor backup files, patch leftover files and the like
1211
1212# Directories & files removed with 'make clean'
1213CLEAN_DIRS += $(MODVERDIR)
1214
1215# Directories & files removed with 'make mrproper'
1216MRPROPER_DIRS += include/config usr/include include/generated \
1217 arch/*/include/generated .tmp_objdiff
1218MRPROPER_FILES += .config .config.old .version .old_version \
1219 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1220 signing_key.pem signing_key.priv signing_key.x509 \
1221 x509.genkey extra_certificates signing_key.x509.keyid \
1222 signing_key.x509.signer vmlinux-gdb.py
1223
1224# clean - Delete most, but leave enough to build external modules
1225#
1226clean: rm-dirs := $(CLEAN_DIRS)
1227clean: rm-files := $(CLEAN_FILES)
1228clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1229
1230PHONY += $(clean-dirs) clean archclean vmlinuxclean
1231$(clean-dirs):
1232 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1233
1234vmlinuxclean:
1235 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1236
1237clean: archclean vmlinuxclean
1238
1239# mrproper - Delete all generated files, including .config
1240#
1241mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1242mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1243mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1244
1245PHONY += $(mrproper-dirs) mrproper archmrproper
1246$(mrproper-dirs):
1247 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1248
1249mrproper: clean archmrproper $(mrproper-dirs)
1250 $(call cmd,rmdirs)
1251 $(call cmd,rmfiles)
1252
1253# distclean
1254#
1255PHONY += distclean
1256
1257distclean: mrproper
1258 @find $(srctree) $(RCS_FIND_IGNORE) \
1259 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1260 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1261 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1262 -type f -print | xargs rm -f
1263
1264
1265# Packaging of the kernel to various formats
1266# ---------------------------------------------------------------------------
1267# rpm target kept for backward compatibility
1268package-dir := scripts/package
1269
1270%src-pkg: FORCE
1271 $(Q)$(MAKE) $(build)=$(package-dir) $@
1272%pkg: include/config/kernel.release FORCE
1273 $(Q)$(MAKE) $(build)=$(package-dir) $@
1274rpm: include/config/kernel.release FORCE
1275 $(Q)$(MAKE) $(build)=$(package-dir) $@
1276
1277
1278# Brief documentation of the typical targets used
1279# ---------------------------------------------------------------------------
1280
1281boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1282boards := $(sort $(notdir $(boards)))
1283board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1284board-dirs := $(sort $(notdir $(board-dirs:/=)))
1285
1286help:
1287 @echo 'Cleaning targets:'
1288 @echo ' clean - Remove most generated files but keep the config and'
1289 @echo ' enough build support to build external modules'
1290 @echo ' mrproper - Remove all generated files + config + various backup files'
1291 @echo ' distclean - mrproper + remove editor backup and patch files'
1292 @echo ''
1293 @echo 'Configuration targets:'
1294 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1295 @echo ''
1296 @echo 'Other generic targets:'
1297 @echo ' all - Build all targets marked with [*]'
1298 @echo '* vmlinux - Build the bare kernel'
1299 @echo '* modules - Build all modules'
1300 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1301 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1302 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1303 @echo ' dir/ - Build all files in dir and below'
1304 @echo ' dir/file.[ois] - Build specified target only'
1305 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1306 @echo ' (requires a recent binutils and recent build (System.map))'
1307 @echo ' dir/file.ko - Build module including final link'
1308 @echo ' modules_prepare - Set up for building external modules'
1309 @echo ' tags/TAGS - Generate tags file for editors'
1310 @echo ' cscope - Generate cscope index'
1311 @echo ' gtags - Generate GNU GLOBAL index'
1312 @echo ' kernelrelease - Output the release version string (use with make -s)'
1313 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1314 @echo ' image_name - Output the image name (use with make -s)'
1315 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1316 echo ' (default: $(INSTALL_HDR_PATH))'; \
1317 echo ''
1318 @echo 'Static analysers'
1319 @echo ' checkstack - Generate a list of stack hogs'
1320 @echo ' namespacecheck - Name space analysis on compiled kernel'
1321 @echo ' versioncheck - Sanity check on version.h usage'
1322 @echo ' includecheck - Check for duplicate included header files'
1323 @echo ' export_report - List the usages of all exported symbols'
1324 @echo ' headers_check - Sanity check on exported headers'
1325 @echo ' headerdep - Detect inclusion cycles in headers'
1326 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1327 @echo ''
1328 @echo 'Kernel selftest'
1329 @echo ' kselftest - Build and run kernel selftest (run as root)'
1330 @echo ' Build, install, and boot kernel before'
1331 @echo ' running kselftest on it'
1332 @echo ' kselftest-clean - Remove all generated kselftest files'
1333 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1334 @echo ' .config.'
1335 @echo ''
1336 @echo 'Kernel packaging:'
1337 @$(MAKE) $(build)=$(package-dir) help
1338 @echo ''
1339 @echo 'Documentation targets:'
1340 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1341 @echo ''
1342 @echo 'Architecture specific targets ($(SRCARCH)):'
1343 @$(if $(archhelp),$(archhelp),\
1344 echo ' No architecture specific help defined for $(SRCARCH)')
1345 @echo ''
1346 @$(if $(boards), \
1347 $(foreach b, $(boards), \
1348 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1349 echo '')
1350 @$(if $(board-dirs), \
1351 $(foreach b, $(board-dirs), \
1352 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1353 printf " %-16s - Show all of the above\\n" help-boards; \
1354 echo '')
1355
1356 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1357 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1358 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1359 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1360 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1361 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1362 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1363 @echo ' 1: warnings which may be relevant and do not occur too often'
1364 @echo ' 2: warnings which occur quite often but may still be relevant'
1365 @echo ' 3: more obscure warnings, can most likely be ignored'
1366 @echo ' Multiple levels can be combined with W=12 or W=123'
1367 @echo ''
1368 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1369 @echo 'For further info see the ./README file'
1370
1371
1372help-board-dirs := $(addprefix help-,$(board-dirs))
1373
1374help-boards: $(help-board-dirs)
1375
1376boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1377
1378$(help-board-dirs): help-%:
1379 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1380 @$(if $(boards-per-dir), \
1381 $(foreach b, $(boards-per-dir), \
1382 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1383 echo '')
1384
1385
1386# Documentation targets
1387# ---------------------------------------------------------------------------
1388%docs: scripts_basic FORCE
1389 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1390 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1391
1392else # KBUILD_EXTMOD
1393
1394###
1395# External module support.
1396# When building external modules the kernel used as basis is considered
1397# read-only, and no consistency checks are made and the make
1398# system is not used on the basis kernel. If updates are required
1399# in the basis kernel ordinary make commands (without M=...) must
1400# be used.
1401#
1402# The following are the only valid targets when building external
1403# modules.
1404# make M=dir clean Delete all automatically generated files
1405# make M=dir modules Make all modules in specified dir
1406# make M=dir Same as 'make M=dir modules'
1407# make M=dir modules_install
1408# Install the modules built in the module directory
1409# Assumes install directory is already created
1410
1411# We are always building modules
1412KBUILD_MODULES := 1
1413PHONY += crmodverdir
1414crmodverdir:
1415 $(cmd_crmodverdir)
1416
1417PHONY += $(objtree)/Module.symvers
1418$(objtree)/Module.symvers:
1419 @test -e $(objtree)/Module.symvers || ( \
1420 echo; \
1421 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1422 echo " is missing; modules will have no dependencies and modversions."; \
1423 echo )
1424
1425module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1426PHONY += $(module-dirs) modules
1427$(module-dirs): crmodverdir $(objtree)/Module.symvers
1428 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1429
1430modules: $(module-dirs)
1431 @$(kecho) ' Building modules, stage 2.';
1432 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1433
1434PHONY += modules_install
1435modules_install: _emodinst_ _emodinst_post
1436
1437install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1438PHONY += _emodinst_
1439_emodinst_:
1440 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1441 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1442
1443PHONY += _emodinst_post
1444_emodinst_post: _emodinst_
1445 $(call cmd,depmod)
1446
1447clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1448
1449PHONY += $(clean-dirs) clean
1450$(clean-dirs):
1451 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1452
1453clean: rm-dirs := $(MODVERDIR)
1454clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1455
1456help:
1457 @echo ' Building external modules.'
1458 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1459 @echo ''
1460 @echo ' modules - default target, build the module(s)'
1461 @echo ' modules_install - install the module'
1462 @echo ' clean - remove generated files in module directory only'
1463 @echo ''
1464
1465# Dummies...
1466PHONY += prepare scripts
1467prepare: ;
1468scripts: ;
1469endif # KBUILD_EXTMOD
1470
1471clean: $(clean-dirs)
1472 $(call cmd,rmdirs)
1473 $(call cmd,rmfiles)
1474 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1475 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1476 -o -name '*.ko.*' \
1477 -o -name '*.dwo' \
1478 -o -name '*.su' \
1479 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1480 -o -name '*.symtypes' -o -name 'modules.order' \
1481 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1482 -o -name '*.gcno' \) -type f -print | xargs rm -f
1483
1484# Generate tags for editors
1485# ---------------------------------------------------------------------------
1486quiet_cmd_tags = GEN $@
1487 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1488
1489tags TAGS cscope gtags: FORCE
1490 $(call cmd,tags)
1491
1492# Scripts to check various things for consistency
1493# ---------------------------------------------------------------------------
1494
1495PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1496
1497includecheck:
1498 find $(srctree)/* $(RCS_FIND_IGNORE) \
1499 -name '*.[hcS]' -type f -print | sort \
1500 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1501
1502versioncheck:
1503 find $(srctree)/* $(RCS_FIND_IGNORE) \
1504 -name '*.[hcS]' -type f -print | sort \
1505 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1506
1507coccicheck:
1508 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1509
1510namespacecheck:
1511 $(PERL) $(srctree)/scripts/namespace.pl
1512
1513export_report:
1514 $(PERL) $(srctree)/scripts/export_report.pl
1515
1516endif #ifeq ($(config-targets),1)
1517endif #ifeq ($(mixed-targets),1)
1518
1519PHONY += checkstack kernelrelease kernelversion image_name
1520
1521# UML needs a little special treatment here. It wants to use the host
1522# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1523# else wants $(ARCH), including people doing cross-builds, which means
1524# that $(SUBARCH) doesn't work here.
1525ifeq ($(ARCH), um)
1526CHECKSTACK_ARCH := $(SUBARCH)
1527else
1528CHECKSTACK_ARCH := $(ARCH)
1529endif
1530checkstack:
1531 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1532 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1533
1534kernelrelease:
1535 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1536
1537kernelversion:
1538 @echo $(KERNELVERSION)
1539
1540image_name:
1541 @echo $(KBUILD_IMAGE)
1542
1543# Clear a bunch of variables before executing the submake
1544tools/: FORCE
1545 $(Q)mkdir -p $(objtree)/tools
1546 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1547
1548tools/%: FORCE
1549 $(Q)mkdir -p $(objtree)/tools
1550 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1551
1552# Single targets
1553# ---------------------------------------------------------------------------
1554# Single targets are compatible with:
1555# - build with mixed source and output
1556# - build with separate output dir 'make O=...'
1557# - external modules
1558#
1559# target-dir => where to store outputfile
1560# build-dir => directory in kernel source tree to use
1561
1562ifeq ($(KBUILD_EXTMOD),)
1563 build-dir = $(patsubst %/,%,$(dir $@))
1564 target-dir = $(dir $@)
1565else
1566 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1567 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1568 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1569endif
1570
1571%.s: %.c prepare scripts FORCE
1572 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1573%.i: %.c prepare scripts FORCE
1574 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1575%.o: %.c prepare scripts FORCE
1576 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1577%.lst: %.c prepare scripts FORCE
1578 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1579%.s: %.S prepare scripts FORCE
1580 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1581%.o: %.S prepare scripts FORCE
1582 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1583%.symtypes: %.c prepare scripts FORCE
1584 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1585
1586# Modules
1587/: prepare scripts FORCE
1588 $(cmd_crmodverdir)
1589 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1590 $(build)=$(build-dir)
1591# Make sure the latest headers are built for Documentation
1592Documentation/: headers_install
1593%/: prepare scripts FORCE
1594 $(cmd_crmodverdir)
1595 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1596 $(build)=$(build-dir)
1597%.ko: prepare scripts FORCE
1598 $(cmd_crmodverdir)
1599 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1600 $(build)=$(build-dir) $(@:.ko=.o)
1601 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1602
1603# FIXME Should go into a make.lib or something
1604# ===========================================================================
1605
1606quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1607 cmd_rmdirs = rm -rf $(rm-dirs)
1608
1609quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1610 cmd_rmfiles = rm -f $(rm-files)
1611
1612# Run depmod only if we have System.map and depmod is executable
1613quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1614 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1615 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1616
1617# Create temporary dir for module support files
1618# clean it up only when building all modules
1619cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1620 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1621
1622# read all saved command lines
1623
1624targets := $(wildcard $(sort $(targets)))
1625cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1626
1627ifneq ($(cmd_files),)
1628 $(cmd_files): ; # Do not try to update included dependency files
1629 include $(cmd_files)
1630endif
1631
1632endif # skip-makefile
1633
1634PHONY += FORCE
1635FORCE:
1636
1637# Declare the contents of the .PHONY variable as phony. We keep that
1638# information in a variable so we can use it in if_changed and friends.
1639.PHONY: $(PHONY)