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 INDIRECT_IOMEM
106 bool
107 help
108 This is selected by other options/architectures to provide the
109 emulated iomem accessors.
110
111config INDIRECT_IOMEM_FALLBACK
112 bool
113 depends on INDIRECT_IOMEM
114 help
115 If INDIRECT_IOMEM is selected, this enables falling back to plain
116 mmio accesses when the IO memory address is not a registered
117 emulated region.
118
119config CRC_CCITT
120 tristate "CRC-CCITT functions"
121 help
122 This option is provided for the case where no in-kernel-tree
123 modules require CRC-CCITT functions, but a module built outside
124 the kernel tree does. Such modules that use library CRC-CCITT
125 functions require M here.
126
127config CRC16
128 tristate "CRC16 functions"
129 help
130 This option is provided for the case where no in-kernel-tree
131 modules require CRC16 functions, but a module built outside
132 the kernel tree does. Such modules that use library CRC16
133 functions require M here.
134
135config CRC_T10DIF
136 tristate "CRC calculation for the T10 Data Integrity Field"
137 select CRYPTO
138 select CRYPTO_CRCT10DIF
139 help
140 This option is only needed if a module that's not in the
141 kernel tree needs to calculate CRC checks for use with the
142 SCSI data integrity subsystem.
143
144config CRC_ITU_T
145 tristate "CRC ITU-T V.41 functions"
146 help
147 This option is provided for the case where no in-kernel-tree
148 modules require CRC ITU-T V.41 functions, but a module built outside
149 the kernel tree does. Such modules that use library CRC ITU-T V.41
150 functions require M here.
151
152config CRC32
153 tristate "CRC32/CRC32c functions"
154 default y
155 select BITREVERSE
156 help
157 This option is provided for the case where no in-kernel-tree
158 modules require CRC32/CRC32c functions, but a module built outside
159 the kernel tree does. Such modules that use library CRC32/CRC32c
160 functions require M here.
161
162config CRC32_SELFTEST
163 tristate "CRC32 perform self test on init"
164 depends on CRC32
165 help
166 This option enables the CRC32 library functions to perform a
167 self test on initialization. The self test computes crc32_le
168 and crc32_be over byte strings with random alignment and length
169 and computes the total elapsed time and number of bytes processed.
170
171choice
172 prompt "CRC32 implementation"
173 depends on CRC32
174 default CRC32_SLICEBY8
175 help
176 This option allows a kernel builder to override the default choice
177 of CRC32 algorithm. Choose the default ("slice by 8") unless you
178 know that you need one of the others.
179
180config CRC32_SLICEBY8
181 bool "Slice by 8 bytes"
182 help
183 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
184 This is the fastest algorithm, but comes with a 8KiB lookup table.
185 Most modern processors have enough cache to hold this table without
186 thrashing the cache.
187
188 This is the default implementation choice. Choose this one unless
189 you have a good reason not to.
190
191config CRC32_SLICEBY4
192 bool "Slice by 4 bytes"
193 help
194 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
195 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
196 table.
197
198 Only choose this option if you know what you are doing.
199
200config CRC32_SARWATE
201 bool "Sarwate's Algorithm (one byte at a time)"
202 help
203 Calculate checksum a byte at a time using Sarwate's algorithm. This
204 is not particularly fast, but has a small 256 byte lookup table.
205
206 Only choose this option if you know what you are doing.
207
208config CRC32_BIT
209 bool "Classic Algorithm (one bit at a time)"
210 help
211 Calculate checksum one bit at a time. This is VERY slow, but has
212 no lookup table. This is provided as a debugging option.
213
214 Only choose this option if you are debugging crc32.
215
216endchoice
217
218config CRC64
219 tristate "CRC64 functions"
220 help
221 This option is provided for the case where no in-kernel-tree
222 modules require CRC64 functions, but a module built outside
223 the kernel tree does. Such modules that use library CRC64
224 functions require M here.
225
226config CRC4
227 tristate "CRC4 functions"
228 help
229 This option is provided for the case where no in-kernel-tree
230 modules require CRC4 functions, but a module built outside
231 the kernel tree does. Such modules that use library CRC4
232 functions require M here.
233
234config CRC7
235 tristate "CRC7 functions"
236 help
237 This option is provided for the case where no in-kernel-tree
238 modules require CRC7 functions, but a module built outside
239 the kernel tree does. Such modules that use library CRC7
240 functions require M here.
241
242config LIBCRC32C
243 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
244 select CRYPTO
245 select CRYPTO_CRC32C
246 help
247 This option is provided for the case where no in-kernel-tree
248 modules require CRC32c functions, but a module built outside the
249 kernel tree does. Such modules that use library CRC32c functions
250 require M here. See Castagnoli93.
251 Module will be libcrc32c.
252
253config CRC8
254 tristate "CRC8 function"
255 help
256 This option provides CRC8 function. Drivers may select this
257 when they need to do cyclic redundancy check according CRC8
258 algorithm. Module will be called crc8.
259
260config XXHASH
261 tristate
262
263config AUDIT_GENERIC
264 bool
265 depends on AUDIT && !AUDIT_ARCH
266 default y
267
268config AUDIT_ARCH_COMPAT_GENERIC
269 bool
270 default n
271
272config AUDIT_COMPAT_GENERIC
273 bool
274 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
275 default y
276
277config RANDOM32_SELFTEST
278 bool "PRNG perform self test on init"
279 help
280 This option enables the 32 bit PRNG library functions to perform a
281 self test on initialization.
282
283
284
285
286config 842_COMPRESS
287 select CRC32
288 tristate
289
290config 842_DECOMPRESS
291 select CRC32
292 tristate
293
294config ZLIB_INFLATE
295 tristate
296
297config ZLIB_DEFLATE
298 tristate
299 select BITREVERSE
300
301config ZLIB_DFLTCC
302 def_bool y
303 depends on S390
304 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
305 help
306 Enable s390x hardware support for zlib in the kernel.
307
308config LZO_COMPRESS
309 tristate
310
311config LZO_DECOMPRESS
312 tristate
313
314config LZ4_COMPRESS
315 tristate
316
317config LZ4HC_COMPRESS
318 tristate
319
320config LZ4_DECOMPRESS
321 tristate
322
323config ZSTD_COMPRESS
324 select XXHASH
325 tristate
326
327config ZSTD_DECOMPRESS
328 select XXHASH
329 tristate
330
331source "lib/xz/Kconfig"
332
333
334
335
336
337config DECOMPRESS_GZIP
338 select ZLIB_INFLATE
339 tristate
340
341config DECOMPRESS_BZIP2
342 tristate
343
344config DECOMPRESS_LZMA
345 tristate
346
347config DECOMPRESS_XZ
348 select XZ_DEC
349 tristate
350
351config DECOMPRESS_LZO
352 select LZO_DECOMPRESS
353 tristate
354
355config DECOMPRESS_LZ4
356 select LZ4_DECOMPRESS
357 tristate
358
359config DECOMPRESS_ZSTD
360 select ZSTD_DECOMPRESS
361 tristate
362
363
364
365
366config GENERIC_ALLOCATOR
367 bool
368
369
370
371
372config REED_SOLOMON
373 tristate
374
375config REED_SOLOMON_ENC8
376 bool
377
378config REED_SOLOMON_DEC8
379 bool
380
381config REED_SOLOMON_ENC16
382 bool
383
384config REED_SOLOMON_DEC16
385 bool
386
387
388
389
390config BCH
391 tristate
392
393config BCH_CONST_PARAMS
394 bool
395 help
396 Drivers may select this option to force specific constant
397 values for parameters 'm' (Galois field order) and 't'
398 (error correction capability). Those specific values must
399 be set by declaring default values for symbols BCH_CONST_M
400 and BCH_CONST_T.
401 Doing so will enable extra compiler optimizations,
402 improving encoding and decoding performance up to 2x for
403 usual (m,t) values (typically such that m*t < 200).
404 When this option is selected, the BCH library supports
405 only a single (m,t) configuration. This is mainly useful
406 for NAND flash board drivers requiring known, fixed BCH
407 parameters.
408
409config BCH_CONST_M
410 int
411 range 5 15
412 help
413 Constant value for Galois field order 'm'. If 'k' is the
414 number of data bits to protect, 'm' should be chosen such
415 that (k + m*t) <= 2**m - 1.
416 Drivers should declare a default value for this symbol if
417 they select option BCH_CONST_PARAMS.
418
419config BCH_CONST_T
420 int
421 help
422 Constant value for error correction capability in bits 't'.
423 Drivers should declare a default value for this symbol if
424 they select option BCH_CONST_PARAMS.
425
426
427
428
429config TEXTSEARCH
430 bool
431
432config TEXTSEARCH_KMP
433 tristate
434
435config TEXTSEARCH_BM
436 tristate
437
438config TEXTSEARCH_FSM
439 tristate
440
441config BTREE
442 bool
443
444config INTERVAL_TREE
445 bool
446 help
447 Simple, embeddable, interval-tree. Can find the start of an
448 overlapping range in log(n) time and then iterate over all
449 overlapping nodes. The algorithm is implemented as an
450 augmented rbtree.
451
452 See:
453
454 Documentation/core-api/rbtree.rst
455
456 for more information.
457
458config XARRAY_MULTI
459 bool
460 help
461 Support entries which occupy multiple consecutive indices in the
462 XArray.
463
464config ASSOCIATIVE_ARRAY
465 bool
466 help
467 Generic associative array. Can be searched and iterated over whilst
468 it is being modified. It is also reasonably quick to search and
469 modify. The algorithms are non-recursive, and the trees are highly
470 capacious.
471
472 See:
473
474 Documentation/core-api/assoc_array.rst
475
476 for more information.
477
478config HAS_IOMEM
479 bool
480 depends on !NO_IOMEM
481 default y
482
483config HAS_IOPORT_MAP
484 bool
485 depends on HAS_IOMEM && !NO_IOPORT_MAP
486 default y
487
488source "kernel/dma/Kconfig"
489
490config SGL_ALLOC
491 bool
492 default n
493
494config IOMMU_HELPER
495 bool
496
497config CHECK_SIGNATURE
498 bool
499
500config CPUMASK_OFFSTACK
501 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
502 help
503 Use dynamic allocation for cpumask_var_t, instead of putting
504 them on the stack. This is a bit more expensive, but avoids
505 stack overflow.
506
507config CPU_RMAP
508 bool
509 depends on SMP
510
511config DQL
512 bool
513
514config GLOB
515 bool
516
517
518
519
520
521
522 help
523 This option provides a glob_match function for performing
524 simple text pattern matching. It originated in the ATA code
525 to blacklist particular drive models, but other device drivers
526 may need similar functionality.
527
528 All drivers in the Linux kernel tree that require this function
529 should automatically select this option. Say N unless you
530 are compiling an out-of tree driver which tells you that it
531 depends on this.
532
533config GLOB_SELFTEST
534 tristate "glob self-test on init"
535 depends on GLOB
536 help
537 This option enables a simple self-test of the glob_match
538 function on startup. It is primarily useful for people
539 working on the code to ensure they haven't introduced any
540 regressions.
541
542 It only adds a little bit of code and slows kernel boot (or
543 module load) by a small amount, so you're welcome to play with
544 it, but you probably don't need it.
545
546
547
548
549config NLATTR
550 bool
551
552
553
554
555config GENERIC_ATOMIC64
556 bool
557
558config LRU_CACHE
559 tristate
560
561config CLZ_TAB
562 bool
563
564config IRQ_POLL
565 bool "IRQ polling library"
566 help
567 Helper library to poll interrupt mitigation using polling.
568
569config MPILIB
570 tristate
571 select CLZ_TAB
572 help
573 Multiprecision maths library from GnuPG.
574 It is used to implement RSA digital signature verification,
575 which is used by IMA/EVM digital signature extension.
576
577config SIGNATURE
578 tristate
579 depends on KEYS
580 select CRYPTO
581 select CRYPTO_SHA1
582 select MPILIB
583 help
584 Digital signature verification. Currently only RSA is supported.
585 Implementation is done using GnuPG MPI library
586
587config DIMLIB
588 bool
589 help
590 Dynamic Interrupt Moderation library.
591 Implements an algorithm for dynamically changing CQ moderation values
592 according to run time performance.
593
594
595
596
597config LIBFDT
598 bool
599
600config OID_REGISTRY
601 tristate
602 help
603 Enable fast lookup object identifier registry.
604
605config UCS2_STRING
606 tristate
607
608
609
610
611source "lib/vdso/Kconfig"
612
613source "lib/fonts/Kconfig"
614
615config SG_SPLIT
616 def_bool n
617 help
618 Provides a helper to split scatterlists into chunks, each chunk being
619 a scatterlist. This should be selected by a driver or an API which
620 whishes to split a scatterlist amongst multiple DMA channels.
621
622config SG_POOL
623 def_bool n
624 help
625 Provides a helper to allocate chained scatterlists. This should be
626 selected by a driver or an API which whishes to allocate chained
627 scatterlist.
628
629
630
631
632
633config ARCH_NO_SG_CHAIN
634 def_bool n
635
636config ARCH_HAS_PMEM_API
637 bool
638
639config MEMREGION
640 bool
641
642config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
643 bool
644
645
646config UACCESS_MEMCPY
647 bool
648
649config ARCH_HAS_UACCESS_FLUSHCACHE
650 bool
651
652
653
654
655
656
657config ARCH_HAS_COPY_MC
658 bool
659
660
661config ARCH_STACKWALK
662 bool
663
664config STACKDEPOT
665 bool
666 select STACKTRACE
667
668config STACK_HASH_ORDER
669 int "stack depot hash size (12 => 4KB, 20 => 1024KB)"
670 range 12 20
671 default 20
672 depends on STACKDEPOT
673 help
674 Select the hash size as a power of 2 for the stackdepot hash table.
675 Choose a lower value to reduce the memory impact.
676
677config SBITMAP
678 bool
679
680config PARMAN
681 tristate "parman" if COMPILE_TEST
682
683config OBJAGG
684 tristate "objagg" if COMPILE_TEST
685
686endmenu
687
688config GENERIC_IOREMAP
689 bool
690
691config GENERIC_LIB_ASHLDI3
692 bool
693
694config GENERIC_LIB_ASHRDI3
695 bool
696
697config GENERIC_LIB_LSHRDI3
698 bool
699
700config GENERIC_LIB_MULDI3
701 bool
702
703config GENERIC_LIB_CMPDI2
704 bool
705
706config GENERIC_LIB_UCMPDI2
707 bool
708
709config GENERIC_LIB_DEVMEM_IS_ALLOWED
710 bool
711
712config PLDMFW
713 bool
714 default n
715
716config ASN1_ENCODER
717 tristate
718
