1
2
3
4
5config BINARY_PRINTF
6 def_bool n
7
8menu "Library routines"
9
10config RAID6_PQ
11 tristate
12
13config BITREVERSE
14 tristate
15
16config HAVE_ARCH_BITREVERSE
17 bool
18 default n
19 depends on BITREVERSE
20 help
21 This option enables the use of hardware bit-reversal instructions on
22 architectures which support such operations.
23
24config RATIONAL
25 bool
26
27config GENERIC_STRNCPY_FROM_USER
28 bool
29
30config GENERIC_STRNLEN_USER
31 bool
32
33config GENERIC_NET_UTILS
34 bool
35
36config GENERIC_FIND_FIRST_BIT
37 bool
38
39config NO_GENERIC_PCI_IOPORT_MAP
40 bool
41
42config GENERIC_PCI_IOMAP
43 bool
44
45config GENERIC_IOMAP
46 bool
47 select GENERIC_PCI_IOMAP
48
49config STMP_DEVICE
50 bool
51
52config ARCH_USE_CMPXCHG_LOCKREF
53 bool
54
55config ARCH_HAS_FAST_MULTIPLIER
56 bool
57
58config INDIRECT_PIO
59 bool "Access I/O in non-MMIO mode"
60 depends on ARM64
61 help
62 On some platforms where no separate I/O space exists, there are I/O
63 hosts which can not be accessed in MMIO mode. Using the logical PIO
64 mechanism, the host-local I/O resource can be mapped into system
65 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
66 system can access the I/O devices with the mapped-logic PIO through
67 I/O accessors.
68
69 This way has relatively little I/O performance cost. Please make
70 sure your devices really need this configure item enabled.
71
72 When in doubt, say N.
73
74config CRC_CCITT
75 tristate "CRC-CCITT functions"
76 help
77 This option is provided for the case where no in-kernel-tree
78 modules require CRC-CCITT functions, but a module built outside
79 the kernel tree does. Such modules that use library CRC-CCITT
80 functions require M here.
81
82config CRC16
83 tristate "CRC16 functions"
84 help
85 This option is provided for the case where no in-kernel-tree
86 modules require CRC16 functions, but a module built outside
87 the kernel tree does. Such modules that use library CRC16
88 functions require M here.
89
90config CRC_T10DIF
91 tristate "CRC calculation for the T10 Data Integrity Field"
92 select CRYPTO
93 select CRYPTO_CRCT10DIF
94 help
95 This option is only needed if a module that's not in the
96 kernel tree needs to calculate CRC checks for use with the
97 SCSI data integrity subsystem.
98
99config CRC_ITU_T
100 tristate "CRC ITU-T V.41 functions"
101 help
102 This option is provided for the case where no in-kernel-tree
103 modules require CRC ITU-T V.41 functions, but a module built outside
104 the kernel tree does. Such modules that use library CRC ITU-T V.41
105 functions require M here.
106
107config CRC32
108 tristate "CRC32/CRC32c functions"
109 default y
110 select BITREVERSE
111 help
112 This option is provided for the case where no in-kernel-tree
113 modules require CRC32/CRC32c functions, but a module built outside
114 the kernel tree does. Such modules that use library CRC32/CRC32c
115 functions require M here.
116
117config CRC32_SELFTEST
118 tristate "CRC32 perform self test on init"
119 depends on CRC32
120 help
121 This option enables the CRC32 library functions to perform a
122 self test on initialization. The self test computes crc32_le
123 and crc32_be over byte strings with random alignment and length
124 and computes the total elapsed time and number of bytes processed.
125
126choice
127 prompt "CRC32 implementation"
128 depends on CRC32
129 default CRC32_SLICEBY8
130 help
131 This option allows a kernel builder to override the default choice
132 of CRC32 algorithm. Choose the default ("slice by 8") unless you
133 know that you need one of the others.
134
135config CRC32_SLICEBY8
136 bool "Slice by 8 bytes"
137 help
138 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
139 This is the fastest algorithm, but comes with a 8KiB lookup table.
140 Most modern processors have enough cache to hold this table without
141 thrashing the cache.
142
143 This is the default implementation choice. Choose this one unless
144 you have a good reason not to.
145
146config CRC32_SLICEBY4
147 bool "Slice by 4 bytes"
148 help
149 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
150 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
151 table.
152
153 Only choose this option if you know what you are doing.
154
155config CRC32_SARWATE
156 bool "Sarwate's Algorithm (one byte at a time)"
157 help
158 Calculate checksum a byte at a time using Sarwate's algorithm. This
159 is not particularly fast, but has a small 256 byte lookup table.
160
161 Only choose this option if you know what you are doing.
162
163config CRC32_BIT
164 bool "Classic Algorithm (one bit at a time)"
165 help
166 Calculate checksum one bit at a time. This is VERY slow, but has
167 no lookup table. This is provided as a debugging option.
168
169 Only choose this option if you are debugging crc32.
170
171endchoice
172
173config CRC4
174 tristate "CRC4 functions"
175 help
176 This option is provided for the case where no in-kernel-tree
177 modules require CRC4 functions, but a module built outside
178 the kernel tree does. Such modules that use library CRC4
179 functions require M here.
180
181config CRC7
182 tristate "CRC7 functions"
183 help
184 This option is provided for the case where no in-kernel-tree
185 modules require CRC7 functions, but a module built outside
186 the kernel tree does. Such modules that use library CRC7
187 functions require M here.
188
189config LIBCRC32C
190 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
191 select CRYPTO
192 select CRYPTO_CRC32C
193 help
194 This option is provided for the case where no in-kernel-tree
195 modules require CRC32c functions, but a module built outside the
196 kernel tree does. Such modules that use library CRC32c functions
197 require M here. See Castagnoli93.
198 Module will be libcrc32c.
199
200config CRC8
201 tristate "CRC8 function"
202 help
203 This option provides CRC8 function. Drivers may select this
204 when they need to do cyclic redundancy check according CRC8
205 algorithm. Module will be called crc8.
206
207config XXHASH
208 tristate
209
210config AUDIT_GENERIC
211 bool
212 depends on AUDIT && !AUDIT_ARCH
213 default y
214
215config AUDIT_ARCH_COMPAT_GENERIC
216 bool
217 default n
218
219config AUDIT_COMPAT_GENERIC
220 bool
221 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
222 default y
223
224config RANDOM32_SELFTEST
225 bool "PRNG perform self test on init"
226 default n
227 help
228 This option enables the 32 bit PRNG library functions to perform a
229 self test on initialization.
230
231
232
233
234config 842_COMPRESS
235 select CRC32
236 tristate
237
238config 842_DECOMPRESS
239 select CRC32
240 tristate
241
242config ZLIB_INFLATE
243 tristate
244
245config ZLIB_DEFLATE
246 tristate
247 select BITREVERSE
248
249config LZO_COMPRESS
250 tristate
251
252config LZO_DECOMPRESS
253 tristate
254
255config LZ4_COMPRESS
256 tristate
257
258config LZ4HC_COMPRESS
259 tristate
260
261config LZ4_DECOMPRESS
262 tristate
263
264config ZSTD_COMPRESS
265 select XXHASH
266 tristate
267
268config ZSTD_DECOMPRESS
269 select XXHASH
270 tristate
271
272source "lib/xz/Kconfig"
273
274
275
276
277
278config DECOMPRESS_GZIP
279 select ZLIB_INFLATE
280 tristate
281
282config DECOMPRESS_BZIP2
283 tristate
284
285config DECOMPRESS_LZMA
286 tristate
287
288config DECOMPRESS_XZ
289 select XZ_DEC
290 tristate
291
292config DECOMPRESS_LZO
293 select LZO_DECOMPRESS
294 tristate
295
296config DECOMPRESS_LZ4
297 select LZ4_DECOMPRESS
298 tristate
299
300
301
302
303config GENERIC_ALLOCATOR
304 bool
305
306
307
308
309config REED_SOLOMON
310 tristate
311
312config REED_SOLOMON_ENC8
313 bool
314
315config REED_SOLOMON_DEC8
316 bool
317
318config REED_SOLOMON_ENC16
319 bool
320
321config REED_SOLOMON_DEC16
322 bool
323
324
325
326
327config BCH
328 tristate
329
330config BCH_CONST_PARAMS
331 bool
332 help
333 Drivers may select this option to force specific constant
334 values for parameters 'm' (Galois field order) and 't'
335 (error correction capability). Those specific values must
336 be set by declaring default values for symbols BCH_CONST_M
337 and BCH_CONST_T.
338 Doing so will enable extra compiler optimizations,
339 improving encoding and decoding performance up to 2x for
340 usual (m,t) values (typically such that m*t < 200).
341 When this option is selected, the BCH library supports
342 only a single (m,t) configuration. This is mainly useful
343 for NAND flash board drivers requiring known, fixed BCH
344 parameters.
345
346config BCH_CONST_M
347 int
348 range 5 15
349 help
350 Constant value for Galois field order 'm'. If 'k' is the
351 number of data bits to protect, 'm' should be chosen such
352 that (k + m*t) <= 2**m - 1.
353 Drivers should declare a default value for this symbol if
354 they select option BCH_CONST_PARAMS.
355
356config BCH_CONST_T
357 int
358 help
359 Constant value for error correction capability in bits 't'.
360 Drivers should declare a default value for this symbol if
361 they select option BCH_CONST_PARAMS.
362
363
364
365
366config TEXTSEARCH
367 bool
368
369config TEXTSEARCH_KMP
370 tristate
371
372config TEXTSEARCH_BM
373 tristate
374
375config TEXTSEARCH_FSM
376 tristate
377
378config BTREE
379 bool
380
381config INTERVAL_TREE
382 bool
383 help
384 Simple, embeddable, interval-tree. Can find the start of an
385 overlapping range in log(n) time and then iterate over all
386 overlapping nodes. The algorithm is implemented as an
387 augmented rbtree.
388
389 See:
390
391 Documentation/rbtree.txt
392
393 for more information.
394
395config RADIX_TREE_MULTIORDER
396 bool
397
398config ASSOCIATIVE_ARRAY
399 bool
400 help
401 Generic associative array. Can be searched and iterated over whilst
402 it is being modified. It is also reasonably quick to search and
403 modify. The algorithms are non-recursive, and the trees are highly
404 capacious.
405
406 See:
407
408 Documentation/assoc_array.txt
409
410 for more information.
411
412config HAS_IOMEM
413 bool
414 depends on !NO_IOMEM
415 select GENERIC_IO
416 default y
417
418config HAS_IOPORT_MAP
419 bool
420 depends on HAS_IOMEM && !NO_IOPORT_MAP
421 default y
422
423config HAS_DMA
424 bool
425 depends on !NO_DMA
426 default y
427
428config SGL_ALLOC
429 bool
430 default n
431
432config DMA_DIRECT_OPS
433 bool
434 depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
435 default n
436
437config DMA_VIRT_OPS
438 bool
439 depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
440 default n
441
442config CHECK_SIGNATURE
443 bool
444
445config CPUMASK_OFFSTACK
446 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
447 help
448 Use dynamic allocation for cpumask_var_t, instead of putting
449 them on the stack. This is a bit more expensive, but avoids
450 stack overflow.
451
452config CPU_RMAP
453 bool
454 depends on SMP
455
456config DQL
457 bool
458
459config GLOB
460 bool
461
462
463
464
465
466
467 help
468 This option provides a glob_match function for performing
469 simple text pattern matching. It originated in the ATA code
470 to blacklist particular drive models, but other device drivers
471 may need similar functionality.
472
473 All drivers in the Linux kernel tree that require this function
474 should automatically select this option. Say N unless you
475 are compiling an out-of tree driver which tells you that it
476 depends on this.
477
478config GLOB_SELFTEST
479 tristate "glob self-test on init"
480 depends on GLOB
481 help
482 This option enables a simple self-test of the glob_match
483 function on startup. It is primarily useful for people
484 working on the code to ensure they haven't introduced any
485 regressions.
486
487 It only adds a little bit of code and slows kernel boot (or
488 module load) by a small amount, so you're welcome to play with
489 it, but you probably don't need it.
490
491
492
493
494config NLATTR
495 bool
496
497
498
499
500config GENERIC_ATOMIC64
501 bool
502
503config LRU_CACHE
504 tristate
505
506config CLZ_TAB
507 bool
508
509config CORDIC
510 tristate "CORDIC algorithm"
511 help
512 This option provides an implementation of the CORDIC algorithm;
513 calculations are in fixed point. Module will be called cordic.
514
515config DDR
516 bool "JEDEC DDR data"
517 help
518 Data from JEDEC specs for DDR SDRAM memories,
519 particularly the AC timing parameters and addressing
520 information. This data is useful for drivers handling
521 DDR SDRAM controllers.
522
523config IRQ_POLL
524 bool "IRQ polling library"
525 help
526 Helper library to poll interrupt mitigation using polling.
527
528config MPILIB
529 tristate
530 select CLZ_TAB
531 help
532 Multiprecision maths library from GnuPG.
533 It is used to implement RSA digital signature verification,
534 which is used by IMA/EVM digital signature extension.
535
536config SIGNATURE
537 tristate
538 depends on KEYS
539 select CRYPTO
540 select CRYPTO_SHA1
541 select MPILIB
542 help
543 Digital signature verification. Currently only RSA is supported.
544 Implementation is done using GnuPG MPI library
545
546
547
548
549config LIBFDT
550 bool
551
552config OID_REGISTRY
553 tristate
554 help
555 Enable fast lookup object identifier registry.
556
557config UCS2_STRING
558 tristate
559
560source "lib/fonts/Kconfig"
561
562config SG_SPLIT
563 def_bool n
564 help
565 Provides a helper to split scatterlists into chunks, each chunk being
566 a scatterlist. This should be selected by a driver or an API which
567 whishes to split a scatterlist amongst multiple DMA channels.
568
569config SG_POOL
570 def_bool n
571 help
572 Provides a helper to allocate chained scatterlists. This should be
573 selected by a driver or an API which whishes to allocate chained
574 scatterlist.
575
576
577
578
579
580config ARCH_HAS_SG_CHAIN
581 def_bool n
582
583config ARCH_HAS_PMEM_API
584 bool
585
586config ARCH_HAS_UACCESS_FLUSHCACHE
587 bool
588
589config STACKDEPOT
590 bool
591 select STACKTRACE
592
593config SBITMAP
594 bool
595
596config PARMAN
597 tristate "parman" if COMPILE_TEST
598
599config PRIME_NUMBERS
600 tristate
601
602config STRING_SELFTEST
603 tristate "Test string functions"
604
605endmenu
606
607config GENERIC_ASHLDI3
608 bool
609
610config GENERIC_ASHRDI3
611 bool
612
613config GENERIC_LSHRDI3
614 bool
615
616config GENERIC_MULDI3
617 bool
618
619config GENERIC_CMPDI2
620 bool
621
622config GENERIC_UCMPDI2
623 bool
624
