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1# SPDX-License-Identifier: GPL-2.0-only
2#
3# Library configuration
4#
5
6config BINARY_PRINTF
7 def_bool n
8
9menu "Library routines"
10
11config RAID6_PQ
12 tristate
13
14config RAID6_PQ_BENCHMARK
15 bool "Automatically choose fastest RAID6 PQ functions"
16 depends on RAID6_PQ
17 default y
18 help
19 Benchmark all available RAID6 PQ functions on init and choose the
20 fastest one.
21
22config LINEAR_RANGES
23 tristate
24
25config PACKING
26 bool "Generic bitfield packing and unpacking"
27 select BITREVERSE
28 default n
29 help
30 This option provides the packing() helper function, which permits
31 converting bitfields between a CPU-usable representation and a
32 memory representation that can have any combination of these quirks:
33 - Is little endian (bytes are reversed within a 32-bit group)
34 - The least-significant 32-bit word comes first (within a 64-bit
35 group)
36 - The most significant bit of a byte is at its right (bit 0 of a
37 register description is numerically 2^7).
38 Drivers may use these helpers to match the bit indices as described
39 in the data sheets of the peripherals they are in control of.
40
41 When in doubt, say N.
42
43config BITREVERSE
44 tristate
45
46config HAVE_ARCH_BITREVERSE
47 bool
48 default n
49 help
50 This option enables the use of hardware bit-reversal instructions on
51 architectures which support such operations.
52
53config ARCH_HAS_STRNCPY_FROM_USER
54 bool
55
56config ARCH_HAS_STRNLEN_USER
57 bool
58
59config GENERIC_STRNCPY_FROM_USER
60 def_bool !ARCH_HAS_STRNCPY_FROM_USER
61
62config GENERIC_STRNLEN_USER
63 def_bool !ARCH_HAS_STRNLEN_USER
64
65config GENERIC_NET_UTILS
66 bool
67
68source "lib/math/Kconfig"
69
70config NO_GENERIC_PCI_IOPORT_MAP
71 bool
72
73config GENERIC_PCI_IOMAP
74 bool
75
76config GENERIC_IOMAP
77 bool
78 select GENERIC_PCI_IOMAP
79
80config STMP_DEVICE
81 bool
82
83config ARCH_USE_CMPXCHG_LOCKREF
84 bool
85
86config ARCH_HAS_FAST_MULTIPLIER
87 bool
88
89config ARCH_USE_SYM_ANNOTATIONS
90 bool
91
92config INDIRECT_PIO
93 bool "Access I/O in non-MMIO mode"
94 depends on ARM64
95 depends on HAS_IOPORT
96 help
97 On some platforms where no separate I/O space exists, there are I/O
98 hosts which can not be accessed in MMIO mode. Using the logical PIO
99 mechanism, the host-local I/O resource can be mapped into system
100 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
101 system can access the I/O devices with the mapped-logic PIO through
102 I/O accessors.
103
104 This way has relatively little I/O performance cost. Please make
105 sure your devices really need this configure item enabled.
106
107 When in doubt, say N.
108
109config INDIRECT_IOMEM
110 bool
111 help
112 This is selected by other options/architectures to provide the
113 emulated iomem accessors.
114
115config INDIRECT_IOMEM_FALLBACK
116 bool
117 depends on INDIRECT_IOMEM
118 help
119 If INDIRECT_IOMEM is selected, this enables falling back to plain
120 mmio accesses when the IO memory address is not a registered
121 emulated region.
122
123config TRACE_MMIO_ACCESS
124 bool "Register read/write tracing"
125 depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS
126 help
127 Create tracepoints for MMIO read/write operations. These trace events
128 can be used for logging all MMIO read/write operations.
129
130source "lib/crypto/Kconfig"
131
132config CRC_CCITT
133 tristate "CRC-CCITT functions"
134 help
135 This option is provided for the case where no in-kernel-tree
136 modules require CRC-CCITT functions, but a module built outside
137 the kernel tree does. Such modules that use library CRC-CCITT
138 functions require M here.
139
140config CRC16
141 tristate "CRC16 functions"
142 help
143 This option is provided for the case where no in-kernel-tree
144 modules require CRC16 functions, but a module built outside
145 the kernel tree does. Such modules that use library CRC16
146 functions require M here.
147
148config CRC_T10DIF
149 tristate "CRC calculation for the T10 Data Integrity Field"
150 select CRYPTO
151 select CRYPTO_CRCT10DIF
152 help
153 This option is only needed if a module that's not in the
154 kernel tree needs to calculate CRC checks for use with the
155 SCSI data integrity subsystem.
156
157config CRC64_ROCKSOFT
158 tristate "CRC calculation for the Rocksoft model CRC64"
159 select CRC64
160 select CRYPTO
161 select CRYPTO_CRC64_ROCKSOFT
162 help
163 This option provides a CRC64 API to a registered crypto driver.
164 This is used with the block layer's data integrity subsystem.
165
166config CRC_ITU_T
167 tristate "CRC ITU-T V.41 functions"
168 help
169 This option is provided for the case where no in-kernel-tree
170 modules require CRC ITU-T V.41 functions, but a module built outside
171 the kernel tree does. Such modules that use library CRC ITU-T V.41
172 functions require M here.
173
174config CRC32
175 tristate "CRC32/CRC32c functions"
176 default y
177 select BITREVERSE
178 help
179 This option is provided for the case where no in-kernel-tree
180 modules require CRC32/CRC32c functions, but a module built outside
181 the kernel tree does. Such modules that use library CRC32/CRC32c
182 functions require M here.
183
184config CRC32_SELFTEST
185 tristate "CRC32 perform self test on init"
186 depends on CRC32
187 help
188 This option enables the CRC32 library functions to perform a
189 self test on initialization. The self test computes crc32_le
190 and crc32_be over byte strings with random alignment and length
191 and computes the total elapsed time and number of bytes processed.
192
193choice
194 prompt "CRC32 implementation"
195 depends on CRC32
196 default CRC32_SLICEBY8
197 help
198 This option allows a kernel builder to override the default choice
199 of CRC32 algorithm. Choose the default ("slice by 8") unless you
200 know that you need one of the others.
201
202config CRC32_SLICEBY8
203 bool "Slice by 8 bytes"
204 help
205 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
206 This is the fastest algorithm, but comes with a 8KiB lookup table.
207 Most modern processors have enough cache to hold this table without
208 thrashing the cache.
209
210 This is the default implementation choice. Choose this one unless
211 you have a good reason not to.
212
213config CRC32_SLICEBY4
214 bool "Slice by 4 bytes"
215 help
216 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
217 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
218 table.
219
220 Only choose this option if you know what you are doing.
221
222config CRC32_SARWATE
223 bool "Sarwate's Algorithm (one byte at a time)"
224 help
225 Calculate checksum a byte at a time using Sarwate's algorithm. This
226 is not particularly fast, but has a small 256 byte lookup table.
227
228 Only choose this option if you know what you are doing.
229
230config CRC32_BIT
231 bool "Classic Algorithm (one bit at a time)"
232 help
233 Calculate checksum one bit at a time. This is VERY slow, but has
234 no lookup table. This is provided as a debugging option.
235
236 Only choose this option if you are debugging crc32.
237
238endchoice
239
240config CRC64
241 tristate "CRC64 functions"
242 help
243 This option is provided for the case where no in-kernel-tree
244 modules require CRC64 functions, but a module built outside
245 the kernel tree does. Such modules that use library CRC64
246 functions require M here.
247
248config CRC4
249 tristate "CRC4 functions"
250 help
251 This option is provided for the case where no in-kernel-tree
252 modules require CRC4 functions, but a module built outside
253 the kernel tree does. Such modules that use library CRC4
254 functions require M here.
255
256config CRC7
257 tristate "CRC7 functions"
258 help
259 This option is provided for the case where no in-kernel-tree
260 modules require CRC7 functions, but a module built outside
261 the kernel tree does. Such modules that use library CRC7
262 functions require M here.
263
264config LIBCRC32C
265 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
266 select CRYPTO
267 select CRYPTO_CRC32C
268 help
269 This option is provided for the case where no in-kernel-tree
270 modules require CRC32c functions, but a module built outside the
271 kernel tree does. Such modules that use library CRC32c functions
272 require M here. See Castagnoli93.
273 Module will be libcrc32c.
274
275config CRC8
276 tristate "CRC8 function"
277 help
278 This option provides CRC8 function. Drivers may select this
279 when they need to do cyclic redundancy check according CRC8
280 algorithm. Module will be called crc8.
281
282config XXHASH
283 tristate
284
285config AUDIT_GENERIC
286 bool
287 depends on AUDIT && !AUDIT_ARCH
288 default y
289
290config AUDIT_ARCH_COMPAT_GENERIC
291 bool
292 default n
293
294config AUDIT_COMPAT_GENERIC
295 bool
296 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
297 default y
298
299config RANDOM32_SELFTEST
300 bool "PRNG perform self test on init"
301 help
302 This option enables the 32 bit PRNG library functions to perform a
303 self test on initialization.
304
305#
306# compression support is select'ed if needed
307#
308config 842_COMPRESS
309 select CRC32
310 tristate
311
312config 842_DECOMPRESS
313 select CRC32
314 tristate
315
316config ZLIB_INFLATE
317 tristate
318
319config ZLIB_DEFLATE
320 tristate
321 select BITREVERSE
322
323config ZLIB_DFLTCC
324 def_bool y
325 depends on S390
326 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
327 help
328 Enable s390x hardware support for zlib in the kernel.
329
330config LZO_COMPRESS
331 tristate
332
333config LZO_DECOMPRESS
334 tristate
335
336config LZ4_COMPRESS
337 tristate
338
339config LZ4HC_COMPRESS
340 tristate
341
342config LZ4_DECOMPRESS
343 tristate
344
345config ZSTD_COMMON
346 select XXHASH
347 tristate
348
349config ZSTD_COMPRESS
350 select ZSTD_COMMON
351 tristate
352
353config ZSTD_DECOMPRESS
354 select ZSTD_COMMON
355 tristate
356
357source "lib/xz/Kconfig"
358
359#
360# These all provide a common interface (hence the apparent duplication with
361# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
362#
363config DECOMPRESS_GZIP
364 select ZLIB_INFLATE
365 tristate
366
367config DECOMPRESS_BZIP2
368 tristate
369
370config DECOMPRESS_LZMA
371 tristate
372
373config DECOMPRESS_XZ
374 select XZ_DEC
375 tristate
376
377config DECOMPRESS_LZO
378 select LZO_DECOMPRESS
379 tristate
380
381config DECOMPRESS_LZ4
382 select LZ4_DECOMPRESS
383 tristate
384
385config DECOMPRESS_ZSTD
386 select ZSTD_DECOMPRESS
387 tristate
388
389#
390# Generic allocator support is selected if needed
391#
392config GENERIC_ALLOCATOR
393 bool
394
395#
396# reed solomon support is select'ed if needed
397#
398config REED_SOLOMON
399 tristate
400
401config REED_SOLOMON_ENC8
402 bool
403
404config REED_SOLOMON_DEC8
405 bool
406
407config REED_SOLOMON_ENC16
408 bool
409
410config REED_SOLOMON_DEC16
411 bool
412
413#
414# BCH support is selected if needed
415#
416config BCH
417 tristate
418 select BITREVERSE
419
420config BCH_CONST_PARAMS
421 bool
422 help
423 Drivers may select this option to force specific constant
424 values for parameters 'm' (Galois field order) and 't'
425 (error correction capability). Those specific values must
426 be set by declaring default values for symbols BCH_CONST_M
427 and BCH_CONST_T.
428 Doing so will enable extra compiler optimizations,
429 improving encoding and decoding performance up to 2x for
430 usual (m,t) values (typically such that m*t < 200).
431 When this option is selected, the BCH library supports
432 only a single (m,t) configuration. This is mainly useful
433 for NAND flash board drivers requiring known, fixed BCH
434 parameters.
435
436config BCH_CONST_M
437 int
438 range 5 15
439 help
440 Constant value for Galois field order 'm'. If 'k' is the
441 number of data bits to protect, 'm' should be chosen such
442 that (k + m*t) <= 2**m - 1.
443 Drivers should declare a default value for this symbol if
444 they select option BCH_CONST_PARAMS.
445
446config BCH_CONST_T
447 int
448 help
449 Constant value for error correction capability in bits 't'.
450 Drivers should declare a default value for this symbol if
451 they select option BCH_CONST_PARAMS.
452
453#
454# Textsearch support is select'ed if needed
455#
456config TEXTSEARCH
457 bool
458
459config TEXTSEARCH_KMP
460 tristate
461
462config TEXTSEARCH_BM
463 tristate
464
465config TEXTSEARCH_FSM
466 tristate
467
468config BTREE
469 bool
470
471config INTERVAL_TREE
472 bool
473 help
474 Simple, embeddable, interval-tree. Can find the start of an
475 overlapping range in log(n) time and then iterate over all
476 overlapping nodes. The algorithm is implemented as an
477 augmented rbtree.
478
479 See:
480
481 Documentation/core-api/rbtree.rst
482
483 for more information.
484
485config INTERVAL_TREE_SPAN_ITER
486 bool
487 depends on INTERVAL_TREE
488
489config XARRAY_MULTI
490 bool
491 help
492 Support entries which occupy multiple consecutive indices in the
493 XArray.
494
495config ASSOCIATIVE_ARRAY
496 bool
497 help
498 Generic associative array. Can be searched and iterated over whilst
499 it is being modified. It is also reasonably quick to search and
500 modify. The algorithms are non-recursive, and the trees are highly
501 capacious.
502
503 See:
504
505 Documentation/core-api/assoc_array.rst
506
507 for more information.
508
509config CLOSURES
510 bool
511
512config HAS_IOMEM
513 bool
514 depends on !NO_IOMEM
515 default y
516
517config HAS_IOPORT
518 bool
519
520config HAS_IOPORT_MAP
521 bool
522 depends on HAS_IOMEM && !NO_IOPORT_MAP
523 default y
524
525source "kernel/dma/Kconfig"
526
527config SGL_ALLOC
528 bool
529 default n
530
531config IOMMU_HELPER
532 bool
533
534config CHECK_SIGNATURE
535 bool
536
537config CPUMASK_OFFSTACK
538 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
539 help
540 Use dynamic allocation for cpumask_var_t, instead of putting
541 them on the stack. This is a bit more expensive, but avoids
542 stack overflow.
543
544config FORCE_NR_CPUS
545 bool "Set number of CPUs at compile time"
546 depends on SMP && EXPERT && !COMPILE_TEST
547 help
548 Say Yes if you have NR_CPUS set to an actual number of possible
549 CPUs in your system, not to a default value. This forces the core
550 code to rely on compile-time value and optimize kernel routines
551 better.
552
553config CPU_RMAP
554 bool
555 depends on SMP
556
557config DQL
558 bool
559
560config GLOB
561 bool
562# This actually supports modular compilation, but the module overhead
563# is ridiculous for the amount of code involved. Until an out-of-tree
564# driver asks for it, we'll just link it directly it into the kernel
565# when required. Since we're ignoring out-of-tree users, there's also
566# no need bother prompting for a manual decision:
567# prompt "glob_match() function"
568 help
569 This option provides a glob_match function for performing
570 simple text pattern matching. It originated in the ATA code
571 to blacklist particular drive models, but other device drivers
572 may need similar functionality.
573
574 All drivers in the Linux kernel tree that require this function
575 should automatically select this option. Say N unless you
576 are compiling an out-of tree driver which tells you that it
577 depends on this.
578
579config GLOB_SELFTEST
580 tristate "glob self-test on init"
581 depends on GLOB
582 help
583 This option enables a simple self-test of the glob_match
584 function on startup. It is primarily useful for people
585 working on the code to ensure they haven't introduced any
586 regressions.
587
588 It only adds a little bit of code and slows kernel boot (or
589 module load) by a small amount, so you're welcome to play with
590 it, but you probably don't need it.
591
592#
593# Netlink attribute parsing support is select'ed if needed
594#
595config NLATTR
596 bool
597
598#
599# Generic 64-bit atomic support is selected if needed
600#
601config GENERIC_ATOMIC64
602 bool
603
604config LRU_CACHE
605 tristate
606
607config CLZ_TAB
608 bool
609
610config IRQ_POLL
611 bool "IRQ polling library"
612 help
613 Helper library to poll interrupt mitigation using polling.
614
615config MPILIB
616 tristate
617 select CLZ_TAB
618 help
619 Multiprecision maths library from GnuPG.
620 It is used to implement RSA digital signature verification,
621 which is used by IMA/EVM digital signature extension.
622
623config SIGNATURE
624 tristate
625 depends on KEYS
626 select CRYPTO
627 select CRYPTO_SHA1
628 select MPILIB
629 help
630 Digital signature verification. Currently only RSA is supported.
631 Implementation is done using GnuPG MPI library
632
633config DIMLIB
634 bool
635 help
636 Dynamic Interrupt Moderation library.
637 Implements an algorithm for dynamically changing CQ moderation values
638 according to run time performance.
639
640#
641# libfdt files, only selected if needed.
642#
643config LIBFDT
644 bool
645
646config OID_REGISTRY
647 tristate
648 help
649 Enable fast lookup object identifier registry.
650
651config UCS2_STRING
652 tristate
653
654#
655# generic vdso
656#
657source "lib/vdso/Kconfig"
658
659source "lib/fonts/Kconfig"
660
661config SG_SPLIT
662 def_bool n
663 help
664 Provides a helper to split scatterlists into chunks, each chunk being
665 a scatterlist. This should be selected by a driver or an API which
666 whishes to split a scatterlist amongst multiple DMA channels.
667
668config SG_POOL
669 def_bool n
670 help
671 Provides a helper to allocate chained scatterlists. This should be
672 selected by a driver or an API which whishes to allocate chained
673 scatterlist.
674
675#
676# sg chaining option
677#
678
679config ARCH_NO_SG_CHAIN
680 def_bool n
681
682config ARCH_HAS_PMEM_API
683 bool
684
685config MEMREGION
686 bool
687
688config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
689 bool
690
691config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
692 bool
693
694# use memcpy to implement user copies for nommu architectures
695config UACCESS_MEMCPY
696 bool
697
698config ARCH_HAS_UACCESS_FLUSHCACHE
699 bool
700
701# arch has a concept of a recoverable synchronous exception due to a
702# memory-read error like x86 machine-check or ARM data-abort, and
703# implements copy_mc_to_{user,kernel} to abort and report
704# 'bytes-transferred' if that exception fires when accessing the source
705# buffer.
706config ARCH_HAS_COPY_MC
707 bool
708
709# Temporary. Goes away when all archs are cleaned up
710config ARCH_STACKWALK
711 bool
712
713config STACKDEPOT
714 bool
715 select STACKTRACE
716 help
717 Stack depot: stack trace storage that avoids duplication
718
719config STACKDEPOT_ALWAYS_INIT
720 bool
721 select STACKDEPOT
722 help
723 Always initialize stack depot during early boot
724
725config STACKDEPOT_MAX_FRAMES
726 int "Maximum number of frames in trace saved in stack depot"
727 range 1 256
728 default 64
729 depends on STACKDEPOT
730
731config REF_TRACKER
732 bool
733 depends on STACKTRACE_SUPPORT
734 select STACKDEPOT
735
736config SBITMAP
737 bool
738
739config PARMAN
740 tristate "parman" if COMPILE_TEST
741
742config OBJAGG
743 tristate "objagg" if COMPILE_TEST
744
745config LWQ_TEST
746 bool "Boot-time test for lwq queuing"
747 help
748 Run boot-time test of light-weight queuing.
749
750endmenu
751
752config GENERIC_IOREMAP
753 bool
754
755config GENERIC_LIB_ASHLDI3
756 bool
757
758config GENERIC_LIB_ASHRDI3
759 bool
760
761config GENERIC_LIB_LSHRDI3
762 bool
763
764config GENERIC_LIB_MULDI3
765 bool
766
767config GENERIC_LIB_CMPDI2
768 bool
769
770config GENERIC_LIB_UCMPDI2
771 bool
772
773config GENERIC_LIB_DEVMEM_IS_ALLOWED
774 bool
775
776config PLDMFW
777 bool
778 default n
779
780config ASN1_ENCODER
781 tristate
782
783config POLYNOMIAL
784 tristate
785
786config FIRMWARE_TABLE
787 bool
1#
2# Library configuration
3#
4
5config BINARY_PRINTF
6 def_bool n
7
8menu "Library routines"
9
10config RAID6_PQ
11 tristate
12
13config BITREVERSE
14 tristate
15
16config HAVE_ARCH_BITREVERSE
17 bool
18 default n
19 depends on BITREVERSE
20 help
21 This option enables the use of hardware bit-reversal instructions on
22 architectures which support such operations.
23
24config RATIONAL
25 bool
26
27config GENERIC_STRNCPY_FROM_USER
28 bool
29
30config GENERIC_STRNLEN_USER
31 bool
32
33config GENERIC_NET_UTILS
34 bool
35
36config GENERIC_FIND_FIRST_BIT
37 bool
38
39config NO_GENERIC_PCI_IOPORT_MAP
40 bool
41
42config GENERIC_PCI_IOMAP
43 bool
44
45config GENERIC_IOMAP
46 bool
47 select GENERIC_PCI_IOMAP
48
49config GENERIC_IO
50 bool
51 default n
52
53config STMP_DEVICE
54 bool
55
56config ARCH_USE_CMPXCHG_LOCKREF
57 bool
58
59config ARCH_HAS_FAST_MULTIPLIER
60 bool
61
62config CRC_CCITT
63 tristate "CRC-CCITT functions"
64 help
65 This option is provided for the case where no in-kernel-tree
66 modules require CRC-CCITT functions, but a module built outside
67 the kernel tree does. Such modules that use library CRC-CCITT
68 functions require M here.
69
70config CRC16
71 tristate "CRC16 functions"
72 help
73 This option is provided for the case where no in-kernel-tree
74 modules require CRC16 functions, but a module built outside
75 the kernel tree does. Such modules that use library CRC16
76 functions require M here.
77
78config CRC_T10DIF
79 tristate "CRC calculation for the T10 Data Integrity Field"
80 select CRYPTO
81 select CRYPTO_CRCT10DIF
82 help
83 This option is only needed if a module that's not in the
84 kernel tree needs to calculate CRC checks for use with the
85 SCSI data integrity subsystem.
86
87config CRC_ITU_T
88 tristate "CRC ITU-T V.41 functions"
89 help
90 This option is provided for the case where no in-kernel-tree
91 modules require CRC ITU-T V.41 functions, but a module built outside
92 the kernel tree does. Such modules that use library CRC ITU-T V.41
93 functions require M here.
94
95config CRC32
96 tristate "CRC32/CRC32c functions"
97 default y
98 select BITREVERSE
99 help
100 This option is provided for the case where no in-kernel-tree
101 modules require CRC32/CRC32c functions, but a module built outside
102 the kernel tree does. Such modules that use library CRC32/CRC32c
103 functions require M here.
104
105config CRC32_SELFTEST
106 bool "CRC32 perform self test on init"
107 default n
108 depends on CRC32
109 help
110 This option enables the CRC32 library functions to perform a
111 self test on initialization. The self test computes crc32_le
112 and crc32_be over byte strings with random alignment and length
113 and computes the total elapsed time and number of bytes processed.
114
115choice
116 prompt "CRC32 implementation"
117 depends on CRC32
118 default CRC32_SLICEBY8
119 help
120 This option allows a kernel builder to override the default choice
121 of CRC32 algorithm. Choose the default ("slice by 8") unless you
122 know that you need one of the others.
123
124config CRC32_SLICEBY8
125 bool "Slice by 8 bytes"
126 help
127 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
128 This is the fastest algorithm, but comes with a 8KiB lookup table.
129 Most modern processors have enough cache to hold this table without
130 thrashing the cache.
131
132 This is the default implementation choice. Choose this one unless
133 you have a good reason not to.
134
135config CRC32_SLICEBY4
136 bool "Slice by 4 bytes"
137 help
138 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
139 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
140 table.
141
142 Only choose this option if you know what you are doing.
143
144config CRC32_SARWATE
145 bool "Sarwate's Algorithm (one byte at a time)"
146 help
147 Calculate checksum a byte at a time using Sarwate's algorithm. This
148 is not particularly fast, but has a small 256 byte lookup table.
149
150 Only choose this option if you know what you are doing.
151
152config CRC32_BIT
153 bool "Classic Algorithm (one bit at a time)"
154 help
155 Calculate checksum one bit at a time. This is VERY slow, but has
156 no lookup table. This is provided as a debugging option.
157
158 Only choose this option if you are debugging crc32.
159
160endchoice
161
162config CRC7
163 tristate "CRC7 functions"
164 help
165 This option is provided for the case where no in-kernel-tree
166 modules require CRC7 functions, but a module built outside
167 the kernel tree does. Such modules that use library CRC7
168 functions require M here.
169
170config LIBCRC32C
171 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
172 select CRYPTO
173 select CRYPTO_CRC32C
174 help
175 This option is provided for the case where no in-kernel-tree
176 modules require CRC32c functions, but a module built outside the
177 kernel tree does. Such modules that use library CRC32c functions
178 require M here. See Castagnoli93.
179 Module will be libcrc32c.
180
181config CRC8
182 tristate "CRC8 function"
183 help
184 This option provides CRC8 function. Drivers may select this
185 when they need to do cyclic redundancy check according CRC8
186 algorithm. Module will be called crc8.
187
188config AUDIT_GENERIC
189 bool
190 depends on AUDIT && !AUDIT_ARCH
191 default y
192
193config AUDIT_ARCH_COMPAT_GENERIC
194 bool
195 default n
196
197config AUDIT_COMPAT_GENERIC
198 bool
199 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
200 default y
201
202config RANDOM32_SELFTEST
203 bool "PRNG perform self test on init"
204 default n
205 help
206 This option enables the 32 bit PRNG library functions to perform a
207 self test on initialization.
208
209#
210# compression support is select'ed if needed
211#
212config 842_COMPRESS
213 select CRC32
214 tristate
215
216config 842_DECOMPRESS
217 select CRC32
218 tristate
219
220config ZLIB_INFLATE
221 tristate
222
223config ZLIB_DEFLATE
224 tristate
225 select BITREVERSE
226
227config LZO_COMPRESS
228 tristate
229
230config LZO_DECOMPRESS
231 tristate
232
233config LZ4_COMPRESS
234 tristate
235
236config LZ4HC_COMPRESS
237 tristate
238
239config LZ4_DECOMPRESS
240 tristate
241
242source "lib/xz/Kconfig"
243
244#
245# These all provide a common interface (hence the apparent duplication with
246# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
247#
248config DECOMPRESS_GZIP
249 select ZLIB_INFLATE
250 tristate
251
252config DECOMPRESS_BZIP2
253 tristate
254
255config DECOMPRESS_LZMA
256 tristate
257
258config DECOMPRESS_XZ
259 select XZ_DEC
260 tristate
261
262config DECOMPRESS_LZO
263 select LZO_DECOMPRESS
264 tristate
265
266config DECOMPRESS_LZ4
267 select LZ4_DECOMPRESS
268 tristate
269
270#
271# Generic allocator support is selected if needed
272#
273config GENERIC_ALLOCATOR
274 bool
275
276#
277# reed solomon support is select'ed if needed
278#
279config REED_SOLOMON
280 tristate
281
282config REED_SOLOMON_ENC8
283 bool
284
285config REED_SOLOMON_DEC8
286 bool
287
288config REED_SOLOMON_ENC16
289 bool
290
291config REED_SOLOMON_DEC16
292 bool
293
294#
295# BCH support is selected if needed
296#
297config BCH
298 tristate
299
300config BCH_CONST_PARAMS
301 bool
302 help
303 Drivers may select this option to force specific constant
304 values for parameters 'm' (Galois field order) and 't'
305 (error correction capability). Those specific values must
306 be set by declaring default values for symbols BCH_CONST_M
307 and BCH_CONST_T.
308 Doing so will enable extra compiler optimizations,
309 improving encoding and decoding performance up to 2x for
310 usual (m,t) values (typically such that m*t < 200).
311 When this option is selected, the BCH library supports
312 only a single (m,t) configuration. This is mainly useful
313 for NAND flash board drivers requiring known, fixed BCH
314 parameters.
315
316config BCH_CONST_M
317 int
318 range 5 15
319 help
320 Constant value for Galois field order 'm'. If 'k' is the
321 number of data bits to protect, 'm' should be chosen such
322 that (k + m*t) <= 2**m - 1.
323 Drivers should declare a default value for this symbol if
324 they select option BCH_CONST_PARAMS.
325
326config BCH_CONST_T
327 int
328 help
329 Constant value for error correction capability in bits 't'.
330 Drivers should declare a default value for this symbol if
331 they select option BCH_CONST_PARAMS.
332
333#
334# Textsearch support is select'ed if needed
335#
336config TEXTSEARCH
337 bool
338
339config TEXTSEARCH_KMP
340 tristate
341
342config TEXTSEARCH_BM
343 tristate
344
345config TEXTSEARCH_FSM
346 tristate
347
348config BTREE
349 bool
350
351config INTERVAL_TREE
352 bool
353 help
354 Simple, embeddable, interval-tree. Can find the start of an
355 overlapping range in log(n) time and then iterate over all
356 overlapping nodes. The algorithm is implemented as an
357 augmented rbtree.
358
359 See:
360
361 Documentation/rbtree.txt
362
363 for more information.
364
365config ASSOCIATIVE_ARRAY
366 bool
367 help
368 Generic associative array. Can be searched and iterated over whilst
369 it is being modified. It is also reasonably quick to search and
370 modify. The algorithms are non-recursive, and the trees are highly
371 capacious.
372
373 See:
374
375 Documentation/assoc_array.txt
376
377 for more information.
378
379config HAS_IOMEM
380 bool
381 depends on !NO_IOMEM
382 select GENERIC_IO
383 default y
384
385config HAS_IOPORT_MAP
386 bool
387 depends on HAS_IOMEM && !NO_IOPORT_MAP
388 default y
389
390config HAS_DMA
391 bool
392 depends on !NO_DMA
393 default y
394
395config CHECK_SIGNATURE
396 bool
397
398config CPUMASK_OFFSTACK
399 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
400 help
401 Use dynamic allocation for cpumask_var_t, instead of putting
402 them on the stack. This is a bit more expensive, but avoids
403 stack overflow.
404
405config CPU_RMAP
406 bool
407 depends on SMP
408
409config DQL
410 bool
411
412config GLOB
413 bool
414# This actually supports modular compilation, but the module overhead
415# is ridiculous for the amount of code involved. Until an out-of-tree
416# driver asks for it, we'll just link it directly it into the kernel
417# when required. Since we're ignoring out-of-tree users, there's also
418# no need bother prompting for a manual decision:
419# prompt "glob_match() function"
420 help
421 This option provides a glob_match function for performing
422 simple text pattern matching. It originated in the ATA code
423 to blacklist particular drive models, but other device drivers
424 may need similar functionality.
425
426 All drivers in the Linux kernel tree that require this function
427 should automatically select this option. Say N unless you
428 are compiling an out-of tree driver which tells you that it
429 depends on this.
430
431config GLOB_SELFTEST
432 bool "glob self-test on init"
433 default n
434 depends on GLOB
435 help
436 This option enables a simple self-test of the glob_match
437 function on startup. It is primarily useful for people
438 working on the code to ensure they haven't introduced any
439 regressions.
440
441 It only adds a little bit of code and slows kernel boot (or
442 module load) by a small amount, so you're welcome to play with
443 it, but you probably don't need it.
444
445#
446# Netlink attribute parsing support is select'ed if needed
447#
448config NLATTR
449 bool
450
451#
452# Generic 64-bit atomic support is selected if needed
453#
454config GENERIC_ATOMIC64
455 bool
456
457config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
458 def_bool y if GENERIC_ATOMIC64
459
460config LRU_CACHE
461 tristate
462
463config CLZ_TAB
464 bool
465
466config CORDIC
467 tristate "CORDIC algorithm"
468 help
469 This option provides an implementation of the CORDIC algorithm;
470 calculations are in fixed point. Module will be called cordic.
471
472config DDR
473 bool "JEDEC DDR data"
474 help
475 Data from JEDEC specs for DDR SDRAM memories,
476 particularly the AC timing parameters and addressing
477 information. This data is useful for drivers handling
478 DDR SDRAM controllers.
479
480config IRQ_POLL
481 bool "IRQ polling library"
482 help
483 Helper library to poll interrupt mitigation using polling.
484
485config MPILIB
486 tristate
487 select CLZ_TAB
488 help
489 Multiprecision maths library from GnuPG.
490 It is used to implement RSA digital signature verification,
491 which is used by IMA/EVM digital signature extension.
492
493config SIGNATURE
494 tristate
495 depends on KEYS
496 select CRYPTO
497 select CRYPTO_SHA1
498 select MPILIB
499 help
500 Digital signature verification. Currently only RSA is supported.
501 Implementation is done using GnuPG MPI library
502
503#
504# libfdt files, only selected if needed.
505#
506config LIBFDT
507 bool
508
509config OID_REGISTRY
510 tristate
511 help
512 Enable fast lookup object identifier registry.
513
514config UCS2_STRING
515 tristate
516
517source "lib/fonts/Kconfig"
518
519config SG_SPLIT
520 def_bool n
521 help
522 Provides a helper to split scatterlists into chunks, each chunk being
523 a scatterlist. This should be selected by a driver or an API which
524 whishes to split a scatterlist amongst multiple DMA channels.
525
526#
527# sg chaining option
528#
529
530config ARCH_HAS_SG_CHAIN
531 def_bool n
532
533config ARCH_HAS_PMEM_API
534 bool
535
536config ARCH_HAS_MMIO_FLUSH
537 bool
538
539config STACKDEPOT
540 bool
541 select STACKTRACE
542
543endmenu