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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 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