1
2
3
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
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
321
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
351
352config GENERIC_ALLOCATOR
353 bool
354
355
356
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
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
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
503
504
505
506
507
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
534
535config NLATTR
536 bool
537
538
539
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
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
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
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
632config UACCESS_MEMCPY
633 bool
634
635config ARCH_HAS_UACCESS_FLUSHCACHE
636 bool
637
638
639
640
641
642
643config ARCH_HAS_COPY_MC
644 bool
645
646
647config ARCH_STACKWALK
648 bool
649
650config STACKDEPOT
651 bool
652 select STACKTRACE
653
654config STACK_HASH_ORDER
655 int "stack depot hash size (12 => 4KB, 20 => 1024KB)"
656 range 12 20
657 default 20
658 depends on STACKDEPOT
659 help
660 Select the hash size as a power of 2 for the stackdepot hash table.
661 Choose a lower value to reduce the memory impact.
662
663config SBITMAP
664 bool
665
666config PARMAN
667 tristate "parman" if COMPILE_TEST
668
669config OBJAGG
670 tristate "objagg" if COMPILE_TEST
671
672config STRING_SELFTEST
673 tristate "Test string functions"
674
675endmenu
676
677config GENERIC_IOREMAP
678 bool
679
680config GENERIC_LIB_ASHLDI3
681 bool
682
683config GENERIC_LIB_ASHRDI3
684 bool
685
686config GENERIC_LIB_LSHRDI3
687 bool
688
689config GENERIC_LIB_MULDI3
690 bool
691
692config GENERIC_LIB_CMPDI2
693 bool
694
695config GENERIC_LIB_UCMPDI2
696 bool
697
698config GENERIC_LIB_DEVMEM_IS_ALLOWED
699 bool
700
701config PLDMFW
702 bool
703 default n
704
705config ASN1_ENCODER
706 tristate
707
