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