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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 PACKING_KUNIT_TEST
44 tristate "KUnit tests for packing library" if !KUNIT_ALL_TESTS
45 depends on PACKING && KUNIT
46 default KUNIT_ALL_TESTS
47 help
48 This builds KUnit tests for the packing library.
49
50 For more information on KUnit and unit tests in general,
51 please refer to the KUnit documentation in Documentation/dev-tools/kunit/.
52
53 When in doubt, say N.
54
55config BITREVERSE
56 tristate
57
58config HAVE_ARCH_BITREVERSE
59 bool
60 default n
61 help
62 This option enables the use of hardware bit-reversal instructions on
63 architectures which support such operations.
64
65config ARCH_HAS_STRNCPY_FROM_USER
66 bool
67
68config ARCH_HAS_STRNLEN_USER
69 bool
70
71config GENERIC_STRNCPY_FROM_USER
72 def_bool !ARCH_HAS_STRNCPY_FROM_USER
73
74config GENERIC_STRNLEN_USER
75 def_bool !ARCH_HAS_STRNLEN_USER
76
77config GENERIC_NET_UTILS
78 bool
79
80source "lib/math/Kconfig"
81
82config NO_GENERIC_PCI_IOPORT_MAP
83 bool
84
85config GENERIC_IOMAP
86 bool
87 select GENERIC_PCI_IOMAP
88
89config STMP_DEVICE
90 bool
91
92config ARCH_USE_CMPXCHG_LOCKREF
93 bool
94
95config ARCH_HAS_FAST_MULTIPLIER
96 bool
97
98config ARCH_USE_SYM_ANNOTATIONS
99 bool
100
101config INDIRECT_PIO
102 bool "Access I/O in non-MMIO mode"
103 depends on ARM64
104 depends on HAS_IOPORT
105 help
106 On some platforms where no separate I/O space exists, there are I/O
107 hosts which can not be accessed in MMIO mode. Using the logical PIO
108 mechanism, the host-local I/O resource can be mapped into system
109 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
110 system can access the I/O devices with the mapped-logic PIO through
111 I/O accessors.
112
113 This way has relatively little I/O performance cost. Please make
114 sure your devices really need this configure item enabled.
115
116 When in doubt, say N.
117
118config INDIRECT_IOMEM
119 bool
120 help
121 This is selected by other options/architectures to provide the
122 emulated iomem accessors.
123
124config INDIRECT_IOMEM_FALLBACK
125 bool
126 depends on INDIRECT_IOMEM
127 help
128 If INDIRECT_IOMEM is selected, this enables falling back to plain
129 mmio accesses when the IO memory address is not a registered
130 emulated region.
131
132config TRACE_MMIO_ACCESS
133 bool "Register read/write tracing"
134 depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS
135 help
136 Create tracepoints for MMIO read/write operations. These trace events
137 can be used for logging all MMIO read/write operations.
138
139source "lib/crypto/Kconfig"
140
141config CRC_CCITT
142 tristate "CRC-CCITT functions"
143 help
144 This option is provided for the case where no in-kernel-tree
145 modules require CRC-CCITT functions, but a module built outside
146 the kernel tree does. Such modules that use library CRC-CCITT
147 functions require M here.
148
149config CRC16
150 tristate "CRC16 functions"
151 help
152 This option is provided for the case where no in-kernel-tree
153 modules require CRC16 functions, but a module built outside
154 the kernel tree does. Such modules that use library CRC16
155 functions require M here.
156
157config CRC_T10DIF
158 tristate "CRC calculation for the T10 Data Integrity Field"
159 select CRYPTO
160 select CRYPTO_CRCT10DIF
161 help
162 This option is only needed if a module that's not in the
163 kernel tree needs to calculate CRC checks for use with the
164 SCSI data integrity subsystem.
165
166config CRC64_ROCKSOFT
167 tristate "CRC calculation for the Rocksoft model CRC64"
168 select CRC64
169 select CRYPTO
170 select CRYPTO_CRC64_ROCKSOFT
171 help
172 This option provides a CRC64 API to a registered crypto driver.
173 This is used with the block layer's data integrity subsystem.
174
175config CRC_ITU_T
176 tristate "CRC ITU-T V.41 functions"
177 help
178 This option is provided for the case where no in-kernel-tree
179 modules require CRC ITU-T V.41 functions, but a module built outside
180 the kernel tree does. Such modules that use library CRC ITU-T V.41
181 functions require M here.
182
183config CRC32
184 tristate "CRC32/CRC32c functions"
185 default y
186 select BITREVERSE
187 help
188 This option is provided for the case where no in-kernel-tree
189 modules require CRC32/CRC32c functions, but a module built outside
190 the kernel tree does. Such modules that use library CRC32/CRC32c
191 functions require M here.
192
193config CRC32_SELFTEST
194 tristate "CRC32 perform self test on init"
195 depends on CRC32
196 help
197 This option enables the CRC32 library functions to perform a
198 self test on initialization. The self test computes crc32_le
199 and crc32_be over byte strings with random alignment and length
200 and computes the total elapsed time and number of bytes processed.
201
202choice
203 prompt "CRC32 implementation"
204 depends on CRC32
205 default CRC32_SLICEBY8
206 help
207 This option allows a kernel builder to override the default choice
208 of CRC32 algorithm. Choose the default ("slice by 8") unless you
209 know that you need one of the others.
210
211config CRC32_SLICEBY8
212 bool "Slice by 8 bytes"
213 help
214 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
215 This is the fastest algorithm, but comes with a 8KiB lookup table.
216 Most modern processors have enough cache to hold this table without
217 thrashing the cache.
218
219 This is the default implementation choice. Choose this one unless
220 you have a good reason not to.
221
222config CRC32_SLICEBY4
223 bool "Slice by 4 bytes"
224 help
225 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
226 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
227 table.
228
229 Only choose this option if you know what you are doing.
230
231config CRC32_SARWATE
232 bool "Sarwate's Algorithm (one byte at a time)"
233 help
234 Calculate checksum a byte at a time using Sarwate's algorithm. This
235 is not particularly fast, but has a small 256 byte lookup table.
236
237 Only choose this option if you know what you are doing.
238
239config CRC32_BIT
240 bool "Classic Algorithm (one bit at a time)"
241 help
242 Calculate checksum one bit at a time. This is VERY slow, but has
243 no lookup table. This is provided as a debugging option.
244
245 Only choose this option if you are debugging crc32.
246
247endchoice
248
249config CRC64
250 tristate "CRC64 functions"
251 help
252 This option is provided for the case where no in-kernel-tree
253 modules require CRC64 functions, but a module built outside
254 the kernel tree does. Such modules that use library CRC64
255 functions require M here.
256
257config CRC4
258 tristate "CRC4 functions"
259 help
260 This option is provided for the case where no in-kernel-tree
261 modules require CRC4 functions, but a module built outside
262 the kernel tree does. Such modules that use library CRC4
263 functions require M here.
264
265config CRC7
266 tristate "CRC7 functions"
267 help
268 This option is provided for the case where no in-kernel-tree
269 modules require CRC7 functions, but a module built outside
270 the kernel tree does. Such modules that use library CRC7
271 functions require M here.
272
273config LIBCRC32C
274 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
275 select CRYPTO
276 select CRYPTO_CRC32C
277 help
278 This option is provided for the case where no in-kernel-tree
279 modules require CRC32c functions, but a module built outside the
280 kernel tree does. Such modules that use library CRC32c functions
281 require M here. See Castagnoli93.
282 Module will be libcrc32c.
283
284config CRC8
285 tristate "CRC8 function"
286 help
287 This option provides CRC8 function. Drivers may select this
288 when they need to do cyclic redundancy check according CRC8
289 algorithm. Module will be called crc8.
290
291config XXHASH
292 tristate
293
294config AUDIT_GENERIC
295 bool
296 depends on AUDIT && !AUDIT_ARCH
297 default y
298
299config AUDIT_ARCH_COMPAT_GENERIC
300 bool
301 default n
302
303config AUDIT_COMPAT_GENERIC
304 bool
305 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
306 default y
307
308config RANDOM32_SELFTEST
309 bool "PRNG perform self test on init"
310 help
311 This option enables the 32 bit PRNG library functions to perform a
312 self test on initialization.
313
314#
315# compression support is select'ed if needed
316#
317config 842_COMPRESS
318 select CRC32
319 tristate
320
321config 842_DECOMPRESS
322 select CRC32
323 tristate
324
325config ZLIB_INFLATE
326 tristate
327
328config ZLIB_DEFLATE
329 tristate
330 select BITREVERSE
331
332config ZLIB_DFLTCC
333 def_bool y
334 depends on S390
335 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
336 help
337 Enable s390x hardware support for zlib in the kernel.
338
339config LZO_COMPRESS
340 tristate
341
342config LZO_DECOMPRESS
343 tristate
344
345config LZ4_COMPRESS
346 tristate
347
348config LZ4HC_COMPRESS
349 tristate
350
351config LZ4_DECOMPRESS
352 tristate
353
354config ZSTD_COMMON
355 select XXHASH
356 tristate
357
358config ZSTD_COMPRESS
359 select ZSTD_COMMON
360 tristate
361
362config ZSTD_DECOMPRESS
363 select ZSTD_COMMON
364 tristate
365
366source "lib/xz/Kconfig"
367
368#
369# These all provide a common interface (hence the apparent duplication with
370# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
371#
372config DECOMPRESS_GZIP
373 select ZLIB_INFLATE
374 tristate
375
376config DECOMPRESS_BZIP2
377 tristate
378
379config DECOMPRESS_LZMA
380 tristate
381
382config DECOMPRESS_XZ
383 select XZ_DEC
384 tristate
385
386config DECOMPRESS_LZO
387 select LZO_DECOMPRESS
388 tristate
389
390config DECOMPRESS_LZ4
391 select LZ4_DECOMPRESS
392 tristate
393
394config DECOMPRESS_ZSTD
395 select ZSTD_DECOMPRESS
396 tristate
397
398#
399# Generic allocator support is selected if needed
400#
401config GENERIC_ALLOCATOR
402 bool
403
404#
405# reed solomon support is select'ed if needed
406#
407config REED_SOLOMON
408 tristate
409
410config REED_SOLOMON_ENC8
411 bool
412
413config REED_SOLOMON_DEC8
414 bool
415
416config REED_SOLOMON_ENC16
417 bool
418
419config REED_SOLOMON_DEC16
420 bool
421
422#
423# BCH support is selected if needed
424#
425config BCH
426 tristate
427 select BITREVERSE
428
429config BCH_CONST_PARAMS
430 bool
431 help
432 Drivers may select this option to force specific constant
433 values for parameters 'm' (Galois field order) and 't'
434 (error correction capability). Those specific values must
435 be set by declaring default values for symbols BCH_CONST_M
436 and BCH_CONST_T.
437 Doing so will enable extra compiler optimizations,
438 improving encoding and decoding performance up to 2x for
439 usual (m,t) values (typically such that m*t < 200).
440 When this option is selected, the BCH library supports
441 only a single (m,t) configuration. This is mainly useful
442 for NAND flash board drivers requiring known, fixed BCH
443 parameters.
444
445config BCH_CONST_M
446 int
447 range 5 15
448 help
449 Constant value for Galois field order 'm'. If 'k' is the
450 number of data bits to protect, 'm' should be chosen such
451 that (k + m*t) <= 2**m - 1.
452 Drivers should declare a default value for this symbol if
453 they select option BCH_CONST_PARAMS.
454
455config BCH_CONST_T
456 int
457 help
458 Constant value for error correction capability in bits 't'.
459 Drivers should declare a default value for this symbol if
460 they select option BCH_CONST_PARAMS.
461
462#
463# Textsearch support is select'ed if needed
464#
465config TEXTSEARCH
466 bool
467
468config TEXTSEARCH_KMP
469 tristate
470
471config TEXTSEARCH_BM
472 tristate
473
474config TEXTSEARCH_FSM
475 tristate
476
477config BTREE
478 bool
479
480config INTERVAL_TREE
481 bool
482 help
483 Simple, embeddable, interval-tree. Can find the start of an
484 overlapping range in log(n) time and then iterate over all
485 overlapping nodes. The algorithm is implemented as an
486 augmented rbtree.
487
488 See:
489
490 Documentation/core-api/rbtree.rst
491
492 for more information.
493
494config INTERVAL_TREE_SPAN_ITER
495 bool
496 depends on INTERVAL_TREE
497
498config XARRAY_MULTI
499 bool
500 help
501 Support entries which occupy multiple consecutive indices in the
502 XArray.
503
504config ASSOCIATIVE_ARRAY
505 bool
506 help
507 Generic associative array. Can be searched and iterated over whilst
508 it is being modified. It is also reasonably quick to search and
509 modify. The algorithms are non-recursive, and the trees are highly
510 capacious.
511
512 See:
513
514 Documentation/core-api/assoc_array.rst
515
516 for more information.
517
518config CLOSURES
519 bool
520
521config HAS_IOMEM
522 bool
523 depends on !NO_IOMEM
524 default y
525
526config HAS_IOPORT
527 bool
528
529config HAS_IOPORT_MAP
530 bool
531 depends on HAS_IOMEM && !NO_IOPORT_MAP
532 default y
533
534source "kernel/dma/Kconfig"
535
536config SGL_ALLOC
537 bool
538 default n
539
540config IOMMU_HELPER
541 bool
542
543config CHECK_SIGNATURE
544 bool
545
546config CPUMASK_OFFSTACK
547 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
548 help
549 Use dynamic allocation for cpumask_var_t, instead of putting
550 them on the stack. This is a bit more expensive, but avoids
551 stack overflow.
552
553config FORCE_NR_CPUS
554 def_bool !SMP
555
556config CPU_RMAP
557 bool
558 depends on SMP
559
560config DQL
561 bool
562
563config GLOB
564 bool
565# This actually supports modular compilation, but the module overhead
566# is ridiculous for the amount of code involved. Until an out-of-tree
567# driver asks for it, we'll just link it directly it into the kernel
568# when required. Since we're ignoring out-of-tree users, there's also
569# no need bother prompting for a manual decision:
570# prompt "glob_match() function"
571 help
572 This option provides a glob_match function for performing
573 simple text pattern matching. It originated in the ATA code
574 to blacklist particular drive models, but other device drivers
575 may need similar functionality.
576
577 All drivers in the Linux kernel tree that require this function
578 should automatically select this option. Say N unless you
579 are compiling an out-of tree driver which tells you that it
580 depends on this.
581
582config GLOB_SELFTEST
583 tristate "glob self-test on init"
584 depends on GLOB
585 help
586 This option enables a simple self-test of the glob_match
587 function on startup. It is primarily useful for people
588 working on the code to ensure they haven't introduced any
589 regressions.
590
591 It only adds a little bit of code and slows kernel boot (or
592 module load) by a small amount, so you're welcome to play with
593 it, but you probably don't need it.
594
595#
596# Netlink attribute parsing support is select'ed if needed
597#
598config NLATTR
599 bool
600
601#
602# Generic 64-bit atomic support is selected if needed
603#
604config GENERIC_ATOMIC64
605 bool
606
607config LRU_CACHE
608 tristate
609
610config CLZ_TAB
611 bool
612
613config IRQ_POLL
614 bool "IRQ polling library"
615 help
616 Helper library to poll interrupt mitigation using polling.
617
618config MPILIB
619 tristate
620 select CLZ_TAB
621 help
622 Multiprecision maths library from GnuPG.
623 It is used to implement RSA digital signature verification,
624 which is used by IMA/EVM digital signature extension.
625
626config SIGNATURE
627 tristate
628 depends on KEYS
629 select CRYPTO
630 select CRYPTO_SHA1
631 select MPILIB
632 help
633 Digital signature verification. Currently only RSA is supported.
634 Implementation is done using GnuPG MPI library
635
636config DIMLIB
637 tristate
638 depends on NET
639 help
640 Dynamic Interrupt Moderation library.
641 Implements an algorithm for dynamically changing CQ moderation values
642 according to run time performance.
643
644#
645# libfdt files, only selected if needed.
646#
647config LIBFDT
648 bool
649
650config OID_REGISTRY
651 tristate
652 help
653 Enable fast lookup object identifier registry.
654
655config UCS2_STRING
656 tristate
657
658#
659# generic vdso
660#
661source "lib/vdso/Kconfig"
662
663source "lib/fonts/Kconfig"
664
665config SG_SPLIT
666 def_bool n
667 help
668 Provides a helper to split scatterlists into chunks, each chunk being
669 a scatterlist. This should be selected by a driver or an API which
670 whishes to split a scatterlist amongst multiple DMA channels.
671
672config SG_POOL
673 def_bool n
674 help
675 Provides a helper to allocate chained scatterlists. This should be
676 selected by a driver or an API which whishes to allocate chained
677 scatterlist.
678
679#
680# sg chaining option
681#
682
683config ARCH_NO_SG_CHAIN
684 def_bool n
685
686config ARCH_HAS_PMEM_API
687 bool
688
689config MEMREGION
690 bool
691
692config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
693 bool
694
695config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
696 bool
697
698# use memcpy to implement user copies for nommu architectures
699config UACCESS_MEMCPY
700 bool
701
702config ARCH_HAS_UACCESS_FLUSHCACHE
703 bool
704
705# arch has a concept of a recoverable synchronous exception due to a
706# memory-read error like x86 machine-check or ARM data-abort, and
707# implements copy_mc_to_{user,kernel} to abort and report
708# 'bytes-transferred' if that exception fires when accessing the source
709# buffer.
710config ARCH_HAS_COPY_MC
711 bool
712
713# Temporary. Goes away when all archs are cleaned up
714config ARCH_STACKWALK
715 bool
716
717config STACKDEPOT
718 bool
719 select STACKTRACE
720 help
721 Stack depot: stack trace storage that avoids duplication
722
723config STACKDEPOT_ALWAYS_INIT
724 bool
725 select STACKDEPOT
726 help
727 Always initialize stack depot during early boot
728
729config STACKDEPOT_MAX_FRAMES
730 int "Maximum number of frames in trace saved in stack depot"
731 range 1 256
732 default 64
733 depends on STACKDEPOT
734
735config REF_TRACKER
736 bool
737 depends on STACKTRACE_SUPPORT
738 select STACKDEPOT
739
740config SBITMAP
741 bool
742
743config PARMAN
744 tristate "parman" if COMPILE_TEST
745
746config OBJAGG
747 tristate "objagg" if COMPILE_TEST
748
749config LWQ_TEST
750 bool "Boot-time test for lwq queuing"
751 help
752 Run boot-time test of light-weight queuing.
753
754endmenu
755
756config GENERIC_IOREMAP
757 bool
758
759config GENERIC_LIB_ASHLDI3
760 bool
761
762config GENERIC_LIB_ASHRDI3
763 bool
764
765config GENERIC_LIB_LSHRDI3
766 bool
767
768config GENERIC_LIB_MULDI3
769 bool
770
771config GENERIC_LIB_CMPDI2
772 bool
773
774config GENERIC_LIB_UCMPDI2
775 bool
776
777config GENERIC_LIB_DEVMEM_IS_ALLOWED
778 bool
779
780config PLDMFW
781 bool
782 default n
783
784config ASN1_ENCODER
785 tristate
786
787config POLYNOMIAL
788 tristate
789
790config FIRMWARE_TABLE
791 bool
792
793config UNION_FIND
794 bool
795
796config MIN_HEAP
797 bool
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 help
96 On some platforms where no separate I/O space exists, there are I/O
97 hosts which can not be accessed in MMIO mode. Using the logical PIO
98 mechanism, the host-local I/O resource can be mapped into system
99 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
100 system can access the I/O devices with the mapped-logic PIO through
101 I/O accessors.
102
103 This way has relatively little I/O performance cost. Please make
104 sure your devices really need this configure item enabled.
105
106 When in doubt, say N.
107
108config INDIRECT_IOMEM
109 bool
110 help
111 This is selected by other options/architectures to provide the
112 emulated iomem accessors.
113
114config INDIRECT_IOMEM_FALLBACK
115 bool
116 depends on INDIRECT_IOMEM
117 help
118 If INDIRECT_IOMEM is selected, this enables falling back to plain
119 mmio accesses when the IO memory address is not a registered
120 emulated region.
121
122config TRACE_MMIO_ACCESS
123 bool "Register read/write tracing"
124 depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS
125 help
126 Create tracepoints for MMIO read/write operations. These trace events
127 can be used for logging all MMIO read/write operations.
128
129source "lib/crypto/Kconfig"
130
131config CRC_CCITT
132 tristate "CRC-CCITT functions"
133 help
134 This option is provided for the case where no in-kernel-tree
135 modules require CRC-CCITT functions, but a module built outside
136 the kernel tree does. Such modules that use library CRC-CCITT
137 functions require M here.
138
139config CRC16
140 tristate "CRC16 functions"
141 help
142 This option is provided for the case where no in-kernel-tree
143 modules require CRC16 functions, but a module built outside
144 the kernel tree does. Such modules that use library CRC16
145 functions require M here.
146
147config CRC_T10DIF
148 tristate "CRC calculation for the T10 Data Integrity Field"
149 select CRYPTO
150 select CRYPTO_CRCT10DIF
151 help
152 This option is only needed if a module that's not in the
153 kernel tree needs to calculate CRC checks for use with the
154 SCSI data integrity subsystem.
155
156config CRC64_ROCKSOFT
157 tristate "CRC calculation for the Rocksoft model CRC64"
158 select CRC64
159 select CRYPTO
160 select CRYPTO_CRC64_ROCKSOFT
161 help
162 This option provides a CRC64 API to a registered crypto driver.
163 This is used with the block layer's data integrity subsystem.
164
165config CRC_ITU_T
166 tristate "CRC ITU-T V.41 functions"
167 help
168 This option is provided for the case where no in-kernel-tree
169 modules require CRC ITU-T V.41 functions, but a module built outside
170 the kernel tree does. Such modules that use library CRC ITU-T V.41
171 functions require M here.
172
173config CRC32
174 tristate "CRC32/CRC32c functions"
175 default y
176 select BITREVERSE
177 help
178 This option is provided for the case where no in-kernel-tree
179 modules require CRC32/CRC32c functions, but a module built outside
180 the kernel tree does. Such modules that use library CRC32/CRC32c
181 functions require M here.
182
183config CRC32_SELFTEST
184 tristate "CRC32 perform self test on init"
185 depends on CRC32
186 help
187 This option enables the CRC32 library functions to perform a
188 self test on initialization. The self test computes crc32_le
189 and crc32_be over byte strings with random alignment and length
190 and computes the total elapsed time and number of bytes processed.
191
192choice
193 prompt "CRC32 implementation"
194 depends on CRC32
195 default CRC32_SLICEBY8
196 help
197 This option allows a kernel builder to override the default choice
198 of CRC32 algorithm. Choose the default ("slice by 8") unless you
199 know that you need one of the others.
200
201config CRC32_SLICEBY8
202 bool "Slice by 8 bytes"
203 help
204 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
205 This is the fastest algorithm, but comes with a 8KiB lookup table.
206 Most modern processors have enough cache to hold this table without
207 thrashing the cache.
208
209 This is the default implementation choice. Choose this one unless
210 you have a good reason not to.
211
212config CRC32_SLICEBY4
213 bool "Slice by 4 bytes"
214 help
215 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
216 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
217 table.
218
219 Only choose this option if you know what you are doing.
220
221config CRC32_SARWATE
222 bool "Sarwate's Algorithm (one byte at a time)"
223 help
224 Calculate checksum a byte at a time using Sarwate's algorithm. This
225 is not particularly fast, but has a small 256 byte lookup table.
226
227 Only choose this option if you know what you are doing.
228
229config CRC32_BIT
230 bool "Classic Algorithm (one bit at a time)"
231 help
232 Calculate checksum one bit at a time. This is VERY slow, but has
233 no lookup table. This is provided as a debugging option.
234
235 Only choose this option if you are debugging crc32.
236
237endchoice
238
239config CRC64
240 tristate "CRC64 functions"
241 help
242 This option is provided for the case where no in-kernel-tree
243 modules require CRC64 functions, but a module built outside
244 the kernel tree does. Such modules that use library CRC64
245 functions require M here.
246
247config CRC4
248 tristate "CRC4 functions"
249 help
250 This option is provided for the case where no in-kernel-tree
251 modules require CRC4 functions, but a module built outside
252 the kernel tree does. Such modules that use library CRC4
253 functions require M here.
254
255config CRC7
256 tristate "CRC7 functions"
257 help
258 This option is provided for the case where no in-kernel-tree
259 modules require CRC7 functions, but a module built outside
260 the kernel tree does. Such modules that use library CRC7
261 functions require M here.
262
263config LIBCRC32C
264 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
265 select CRYPTO
266 select CRYPTO_CRC32C
267 help
268 This option is provided for the case where no in-kernel-tree
269 modules require CRC32c functions, but a module built outside the
270 kernel tree does. Such modules that use library CRC32c functions
271 require M here. See Castagnoli93.
272 Module will be libcrc32c.
273
274config CRC8
275 tristate "CRC8 function"
276 help
277 This option provides CRC8 function. Drivers may select this
278 when they need to do cyclic redundancy check according CRC8
279 algorithm. Module will be called crc8.
280
281config XXHASH
282 tristate
283
284config AUDIT_GENERIC
285 bool
286 depends on AUDIT && !AUDIT_ARCH
287 default y
288
289config AUDIT_ARCH_COMPAT_GENERIC
290 bool
291 default n
292
293config AUDIT_COMPAT_GENERIC
294 bool
295 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
296 default y
297
298config RANDOM32_SELFTEST
299 bool "PRNG perform self test on init"
300 help
301 This option enables the 32 bit PRNG library functions to perform a
302 self test on initialization.
303
304#
305# compression support is select'ed if needed
306#
307config 842_COMPRESS
308 select CRC32
309 tristate
310
311config 842_DECOMPRESS
312 select CRC32
313 tristate
314
315config ZLIB_INFLATE
316 tristate
317
318config ZLIB_DEFLATE
319 tristate
320 select BITREVERSE
321
322config ZLIB_DFLTCC
323 def_bool y
324 depends on S390
325 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
326 help
327 Enable s390x hardware support for zlib in the kernel.
328
329config LZO_COMPRESS
330 tristate
331
332config LZO_DECOMPRESS
333 tristate
334
335config LZ4_COMPRESS
336 tristate
337
338config LZ4HC_COMPRESS
339 tristate
340
341config LZ4_DECOMPRESS
342 tristate
343
344config ZSTD_COMMON
345 select XXHASH
346 tristate
347
348config ZSTD_COMPRESS
349 select ZSTD_COMMON
350 tristate
351
352config ZSTD_DECOMPRESS
353 select ZSTD_COMMON
354 tristate
355
356source "lib/xz/Kconfig"
357
358#
359# These all provide a common interface (hence the apparent duplication with
360# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
361#
362config DECOMPRESS_GZIP
363 select ZLIB_INFLATE
364 tristate
365
366config DECOMPRESS_BZIP2
367 tristate
368
369config DECOMPRESS_LZMA
370 tristate
371
372config DECOMPRESS_XZ
373 select XZ_DEC
374 tristate
375
376config DECOMPRESS_LZO
377 select LZO_DECOMPRESS
378 tristate
379
380config DECOMPRESS_LZ4
381 select LZ4_DECOMPRESS
382 tristate
383
384config DECOMPRESS_ZSTD
385 select ZSTD_DECOMPRESS
386 tristate
387
388#
389# Generic allocator support is selected if needed
390#
391config GENERIC_ALLOCATOR
392 bool
393
394#
395# reed solomon support is select'ed if needed
396#
397config REED_SOLOMON
398 tristate
399
400config REED_SOLOMON_ENC8
401 bool
402
403config REED_SOLOMON_DEC8
404 bool
405
406config REED_SOLOMON_ENC16
407 bool
408
409config REED_SOLOMON_DEC16
410 bool
411
412#
413# BCH support is selected if needed
414#
415config BCH
416 tristate
417
418config BCH_CONST_PARAMS
419 bool
420 help
421 Drivers may select this option to force specific constant
422 values for parameters 'm' (Galois field order) and 't'
423 (error correction capability). Those specific values must
424 be set by declaring default values for symbols BCH_CONST_M
425 and BCH_CONST_T.
426 Doing so will enable extra compiler optimizations,
427 improving encoding and decoding performance up to 2x for
428 usual (m,t) values (typically such that m*t < 200).
429 When this option is selected, the BCH library supports
430 only a single (m,t) configuration. This is mainly useful
431 for NAND flash board drivers requiring known, fixed BCH
432 parameters.
433
434config BCH_CONST_M
435 int
436 range 5 15
437 help
438 Constant value for Galois field order 'm'. If 'k' is the
439 number of data bits to protect, 'm' should be chosen such
440 that (k + m*t) <= 2**m - 1.
441 Drivers should declare a default value for this symbol if
442 they select option BCH_CONST_PARAMS.
443
444config BCH_CONST_T
445 int
446 help
447 Constant value for error correction capability in bits 't'.
448 Drivers should declare a default value for this symbol if
449 they select option BCH_CONST_PARAMS.
450
451#
452# Textsearch support is select'ed if needed
453#
454config TEXTSEARCH
455 bool
456
457config TEXTSEARCH_KMP
458 tristate
459
460config TEXTSEARCH_BM
461 tristate
462
463config TEXTSEARCH_FSM
464 tristate
465
466config BTREE
467 bool
468
469config INTERVAL_TREE
470 bool
471 help
472 Simple, embeddable, interval-tree. Can find the start of an
473 overlapping range in log(n) time and then iterate over all
474 overlapping nodes. The algorithm is implemented as an
475 augmented rbtree.
476
477 See:
478
479 Documentation/core-api/rbtree.rst
480
481 for more information.
482
483config INTERVAL_TREE_SPAN_ITER
484 bool
485 depends on INTERVAL_TREE
486
487config XARRAY_MULTI
488 bool
489 help
490 Support entries which occupy multiple consecutive indices in the
491 XArray.
492
493config ASSOCIATIVE_ARRAY
494 bool
495 help
496 Generic associative array. Can be searched and iterated over whilst
497 it is being modified. It is also reasonably quick to search and
498 modify. The algorithms are non-recursive, and the trees are highly
499 capacious.
500
501 See:
502
503 Documentation/core-api/assoc_array.rst
504
505 for more information.
506
507config HAS_IOMEM
508 bool
509 depends on !NO_IOMEM
510 default y
511
512config HAS_IOPORT_MAP
513 bool
514 depends on HAS_IOMEM && !NO_IOPORT_MAP
515 default y
516
517source "kernel/dma/Kconfig"
518
519config SGL_ALLOC
520 bool
521 default n
522
523config IOMMU_HELPER
524 bool
525
526config CHECK_SIGNATURE
527 bool
528
529config CPUMASK_OFFSTACK
530 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
531 help
532 Use dynamic allocation for cpumask_var_t, instead of putting
533 them on the stack. This is a bit more expensive, but avoids
534 stack overflow.
535
536config FORCE_NR_CPUS
537 bool "Set number of CPUs at compile time"
538 depends on SMP && EXPERT && !COMPILE_TEST
539 help
540 Say Yes if you have NR_CPUS set to an actual number of possible
541 CPUs in your system, not to a default value. This forces the core
542 code to rely on compile-time value and optimize kernel routines
543 better.
544
545config CPU_RMAP
546 bool
547 depends on SMP
548
549config DQL
550 bool
551
552config GLOB
553 bool
554# This actually supports modular compilation, but the module overhead
555# is ridiculous for the amount of code involved. Until an out-of-tree
556# driver asks for it, we'll just link it directly it into the kernel
557# when required. Since we're ignoring out-of-tree users, there's also
558# no need bother prompting for a manual decision:
559# prompt "glob_match() function"
560 help
561 This option provides a glob_match function for performing
562 simple text pattern matching. It originated in the ATA code
563 to blacklist particular drive models, but other device drivers
564 may need similar functionality.
565
566 All drivers in the Linux kernel tree that require this function
567 should automatically select this option. Say N unless you
568 are compiling an out-of tree driver which tells you that it
569 depends on this.
570
571config GLOB_SELFTEST
572 tristate "glob self-test on init"
573 depends on GLOB
574 help
575 This option enables a simple self-test of the glob_match
576 function on startup. It is primarily useful for people
577 working on the code to ensure they haven't introduced any
578 regressions.
579
580 It only adds a little bit of code and slows kernel boot (or
581 module load) by a small amount, so you're welcome to play with
582 it, but you probably don't need it.
583
584#
585# Netlink attribute parsing support is select'ed if needed
586#
587config NLATTR
588 bool
589
590#
591# Generic 64-bit atomic support is selected if needed
592#
593config GENERIC_ATOMIC64
594 bool
595
596config LRU_CACHE
597 tristate
598
599config CLZ_TAB
600 bool
601
602config IRQ_POLL
603 bool "IRQ polling library"
604 help
605 Helper library to poll interrupt mitigation using polling.
606
607config MPILIB
608 tristate
609 select CLZ_TAB
610 help
611 Multiprecision maths library from GnuPG.
612 It is used to implement RSA digital signature verification,
613 which is used by IMA/EVM digital signature extension.
614
615config SIGNATURE
616 tristate
617 depends on KEYS
618 select CRYPTO
619 select CRYPTO_SHA1
620 select MPILIB
621 help
622 Digital signature verification. Currently only RSA is supported.
623 Implementation is done using GnuPG MPI library
624
625config DIMLIB
626 bool
627 help
628 Dynamic Interrupt Moderation library.
629 Implements an algorithm for dynamically changing CQ moderation values
630 according to run time performance.
631
632#
633# libfdt files, only selected if needed.
634#
635config LIBFDT
636 bool
637
638config OID_REGISTRY
639 tristate
640 help
641 Enable fast lookup object identifier registry.
642
643config UCS2_STRING
644 tristate
645
646#
647# generic vdso
648#
649source "lib/vdso/Kconfig"
650
651source "lib/fonts/Kconfig"
652
653config SG_SPLIT
654 def_bool n
655 help
656 Provides a helper to split scatterlists into chunks, each chunk being
657 a scatterlist. This should be selected by a driver or an API which
658 whishes to split a scatterlist amongst multiple DMA channels.
659
660config SG_POOL
661 def_bool n
662 help
663 Provides a helper to allocate chained scatterlists. This should be
664 selected by a driver or an API which whishes to allocate chained
665 scatterlist.
666
667#
668# sg chaining option
669#
670
671config ARCH_NO_SG_CHAIN
672 def_bool n
673
674config ARCH_HAS_PMEM_API
675 bool
676
677config MEMREGION
678 bool
679
680config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
681 bool
682
683config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
684 bool
685
686# use memcpy to implement user copies for nommu architectures
687config UACCESS_MEMCPY
688 bool
689
690config ARCH_HAS_UACCESS_FLUSHCACHE
691 bool
692
693# arch has a concept of a recoverable synchronous exception due to a
694# memory-read error like x86 machine-check or ARM data-abort, and
695# implements copy_mc_to_{user,kernel} to abort and report
696# 'bytes-transferred' if that exception fires when accessing the source
697# buffer.
698config ARCH_HAS_COPY_MC
699 bool
700
701# Temporary. Goes away when all archs are cleaned up
702config ARCH_STACKWALK
703 bool
704
705config STACKDEPOT
706 bool
707 select STACKTRACE
708
709config STACKDEPOT_ALWAYS_INIT
710 bool
711 select STACKDEPOT
712
713config REF_TRACKER
714 bool
715 depends on STACKTRACE_SUPPORT
716 select STACKDEPOT
717
718config SBITMAP
719 bool
720
721config PARMAN
722 tristate "parman" if COMPILE_TEST
723
724config OBJAGG
725 tristate "objagg" if COMPILE_TEST
726
727endmenu
728
729config GENERIC_IOREMAP
730 bool
731
732config GENERIC_LIB_ASHLDI3
733 bool
734
735config GENERIC_LIB_ASHRDI3
736 bool
737
738config GENERIC_LIB_LSHRDI3
739 bool
740
741config GENERIC_LIB_MULDI3
742 bool
743
744config GENERIC_LIB_CMPDI2
745 bool
746
747config GENERIC_LIB_UCMPDI2
748 bool
749
750config GENERIC_LIB_DEVMEM_IS_ALLOWED
751 bool
752
753config PLDMFW
754 bool
755 default n
756
757config ASN1_ENCODER
758 tristate
759
760config POLYNOMIAL
761 tristate