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