Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#
2# Library configuration
3#
4
5config BINARY_PRINTF
6 def_bool n
7
8menu "Library routines"
9
10config RAID6_PQ
11 tristate
12
13config RAID6_PQ_BENCHMARK
14 bool "Automatically choose fastest RAID6 PQ functions"
15 depends on RAID6_PQ
16 default y
17 help
18 Benchmark all available RAID6 PQ functions on init and choose the
19 fastest one.
20
21config BITREVERSE
22 tristate
23
24config HAVE_ARCH_BITREVERSE
25 bool
26 default n
27 depends on BITREVERSE
28 help
29 This option enables the use of hardware bit-reversal instructions on
30 architectures which support such operations.
31
32config RATIONAL
33 bool
34
35config GENERIC_STRNCPY_FROM_USER
36 bool
37
38config GENERIC_STRNLEN_USER
39 bool
40
41config GENERIC_NET_UTILS
42 bool
43
44config GENERIC_FIND_FIRST_BIT
45 bool
46
47config NO_GENERIC_PCI_IOPORT_MAP
48 bool
49
50config GENERIC_PCI_IOMAP
51 bool
52
53config GENERIC_IOMAP
54 bool
55 select GENERIC_PCI_IOMAP
56
57config STMP_DEVICE
58 bool
59
60config ARCH_USE_CMPXCHG_LOCKREF
61 bool
62
63config ARCH_HAS_FAST_MULTIPLIER
64 bool
65
66config INDIRECT_PIO
67 bool "Access I/O in non-MMIO mode"
68 depends on ARM64
69 help
70 On some platforms where no separate I/O space exists, there are I/O
71 hosts which can not be accessed in MMIO mode. Using the logical PIO
72 mechanism, the host-local I/O resource can be mapped into system
73 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
74 system can access the I/O devices with the mapped-logic PIO through
75 I/O accessors.
76
77 This way has relatively little I/O performance cost. Please make
78 sure your devices really need this configure item enabled.
79
80 When in doubt, say N.
81
82config CRC_CCITT
83 tristate "CRC-CCITT functions"
84 help
85 This option is provided for the case where no in-kernel-tree
86 modules require CRC-CCITT functions, but a module built outside
87 the kernel tree does. Such modules that use library CRC-CCITT
88 functions require M here.
89
90config CRC16
91 tristate "CRC16 functions"
92 help
93 This option is provided for the case where no in-kernel-tree
94 modules require CRC16 functions, but a module built outside
95 the kernel tree does. Such modules that use library CRC16
96 functions require M here.
97
98config CRC_T10DIF
99 tristate "CRC calculation for the T10 Data Integrity Field"
100 select CRYPTO
101 select CRYPTO_CRCT10DIF
102 help
103 This option is only needed if a module that's not in the
104 kernel tree needs to calculate CRC checks for use with the
105 SCSI data integrity subsystem.
106
107config CRC_ITU_T
108 tristate "CRC ITU-T V.41 functions"
109 help
110 This option is provided for the case where no in-kernel-tree
111 modules require CRC ITU-T V.41 functions, but a module built outside
112 the kernel tree does. Such modules that use library CRC ITU-T V.41
113 functions require M here.
114
115config CRC32
116 tristate "CRC32/CRC32c functions"
117 default y
118 select BITREVERSE
119 help
120 This option is provided for the case where no in-kernel-tree
121 modules require CRC32/CRC32c functions, but a module built outside
122 the kernel tree does. Such modules that use library CRC32/CRC32c
123 functions require M here.
124
125config CRC32_SELFTEST
126 tristate "CRC32 perform self test on init"
127 depends on CRC32
128 help
129 This option enables the CRC32 library functions to perform a
130 self test on initialization. The self test computes crc32_le
131 and crc32_be over byte strings with random alignment and length
132 and computes the total elapsed time and number of bytes processed.
133
134choice
135 prompt "CRC32 implementation"
136 depends on CRC32
137 default CRC32_SLICEBY8
138 help
139 This option allows a kernel builder to override the default choice
140 of CRC32 algorithm. Choose the default ("slice by 8") unless you
141 know that you need one of the others.
142
143config CRC32_SLICEBY8
144 bool "Slice by 8 bytes"
145 help
146 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
147 This is the fastest algorithm, but comes with a 8KiB lookup table.
148 Most modern processors have enough cache to hold this table without
149 thrashing the cache.
150
151 This is the default implementation choice. Choose this one unless
152 you have a good reason not to.
153
154config CRC32_SLICEBY4
155 bool "Slice by 4 bytes"
156 help
157 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
158 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
159 table.
160
161 Only choose this option if you know what you are doing.
162
163config CRC32_SARWATE
164 bool "Sarwate's Algorithm (one byte at a time)"
165 help
166 Calculate checksum a byte at a time using Sarwate's algorithm. This
167 is not particularly fast, but has a small 256 byte lookup table.
168
169 Only choose this option if you know what you are doing.
170
171config CRC32_BIT
172 bool "Classic Algorithm (one bit at a time)"
173 help
174 Calculate checksum one bit at a time. This is VERY slow, but has
175 no lookup table. This is provided as a debugging option.
176
177 Only choose this option if you are debugging crc32.
178
179endchoice
180
181config CRC64
182 tristate "CRC64 functions"
183 help
184 This option is provided for the case where no in-kernel-tree
185 modules require CRC64 functions, but a module built outside
186 the kernel tree does. Such modules that use library CRC64
187 functions require M here.
188
189config CRC4
190 tristate "CRC4 functions"
191 help
192 This option is provided for the case where no in-kernel-tree
193 modules require CRC4 functions, but a module built outside
194 the kernel tree does. Such modules that use library CRC4
195 functions require M here.
196
197config CRC7
198 tristate "CRC7 functions"
199 help
200 This option is provided for the case where no in-kernel-tree
201 modules require CRC7 functions, but a module built outside
202 the kernel tree does. Such modules that use library CRC7
203 functions require M here.
204
205config LIBCRC32C
206 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
207 select CRYPTO
208 select CRYPTO_CRC32C
209 help
210 This option is provided for the case where no in-kernel-tree
211 modules require CRC32c functions, but a module built outside the
212 kernel tree does. Such modules that use library CRC32c functions
213 require M here. See Castagnoli93.
214 Module will be libcrc32c.
215
216config CRC8
217 tristate "CRC8 function"
218 help
219 This option provides CRC8 function. Drivers may select this
220 when they need to do cyclic redundancy check according CRC8
221 algorithm. Module will be called crc8.
222
223config XXHASH
224 tristate
225
226config AUDIT_GENERIC
227 bool
228 depends on AUDIT && !AUDIT_ARCH
229 default y
230
231config AUDIT_ARCH_COMPAT_GENERIC
232 bool
233 default n
234
235config AUDIT_COMPAT_GENERIC
236 bool
237 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
238 default y
239
240config RANDOM32_SELFTEST
241 bool "PRNG perform self test on init"
242 help
243 This option enables the 32 bit PRNG library functions to perform a
244 self test on initialization.
245
246#
247# compression support is select'ed if needed
248#
249config 842_COMPRESS
250 select CRC32
251 tristate
252
253config 842_DECOMPRESS
254 select CRC32
255 tristate
256
257config ZLIB_INFLATE
258 tristate
259
260config ZLIB_DEFLATE
261 tristate
262 select BITREVERSE
263
264config LZO_COMPRESS
265 tristate
266
267config LZO_DECOMPRESS
268 tristate
269
270config LZ4_COMPRESS
271 tristate
272
273config LZ4HC_COMPRESS
274 tristate
275
276config LZ4_DECOMPRESS
277 tristate
278
279config ZSTD_COMPRESS
280 select XXHASH
281 tristate
282
283config ZSTD_DECOMPRESS
284 select XXHASH
285 tristate
286
287source "lib/xz/Kconfig"
288
289#
290# These all provide a common interface (hence the apparent duplication with
291# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
292#
293config DECOMPRESS_GZIP
294 select ZLIB_INFLATE
295 tristate
296
297config DECOMPRESS_BZIP2
298 tristate
299
300config DECOMPRESS_LZMA
301 tristate
302
303config DECOMPRESS_XZ
304 select XZ_DEC
305 tristate
306
307config DECOMPRESS_LZO
308 select LZO_DECOMPRESS
309 tristate
310
311config DECOMPRESS_LZ4
312 select LZ4_DECOMPRESS
313 tristate
314
315#
316# Generic allocator support is selected if needed
317#
318config GENERIC_ALLOCATOR
319 bool
320
321#
322# reed solomon support is select'ed if needed
323#
324config REED_SOLOMON
325 tristate
326
327config REED_SOLOMON_ENC8
328 bool
329
330config REED_SOLOMON_DEC8
331 bool
332
333config REED_SOLOMON_ENC16
334 bool
335
336config REED_SOLOMON_DEC16
337 bool
338
339#
340# BCH support is selected if needed
341#
342config BCH
343 tristate
344
345config BCH_CONST_PARAMS
346 bool
347 help
348 Drivers may select this option to force specific constant
349 values for parameters 'm' (Galois field order) and 't'
350 (error correction capability). Those specific values must
351 be set by declaring default values for symbols BCH_CONST_M
352 and BCH_CONST_T.
353 Doing so will enable extra compiler optimizations,
354 improving encoding and decoding performance up to 2x for
355 usual (m,t) values (typically such that m*t < 200).
356 When this option is selected, the BCH library supports
357 only a single (m,t) configuration. This is mainly useful
358 for NAND flash board drivers requiring known, fixed BCH
359 parameters.
360
361config BCH_CONST_M
362 int
363 range 5 15
364 help
365 Constant value for Galois field order 'm'. If 'k' is the
366 number of data bits to protect, 'm' should be chosen such
367 that (k + m*t) <= 2**m - 1.
368 Drivers should declare a default value for this symbol if
369 they select option BCH_CONST_PARAMS.
370
371config BCH_CONST_T
372 int
373 help
374 Constant value for error correction capability in bits 't'.
375 Drivers should declare a default value for this symbol if
376 they select option BCH_CONST_PARAMS.
377
378#
379# Textsearch support is select'ed if needed
380#
381config TEXTSEARCH
382 bool
383
384config TEXTSEARCH_KMP
385 tristate
386
387config TEXTSEARCH_BM
388 tristate
389
390config TEXTSEARCH_FSM
391 tristate
392
393config BTREE
394 bool
395
396config INTERVAL_TREE
397 bool
398 help
399 Simple, embeddable, interval-tree. Can find the start of an
400 overlapping range in log(n) time and then iterate over all
401 overlapping nodes. The algorithm is implemented as an
402 augmented rbtree.
403
404 See:
405
406 Documentation/rbtree.txt
407
408 for more information.
409
410config XARRAY_MULTI
411 bool
412 help
413 Support entries which occupy multiple consecutive indices in the
414 XArray.
415
416config ASSOCIATIVE_ARRAY
417 bool
418 help
419 Generic associative array. Can be searched and iterated over whilst
420 it is being modified. It is also reasonably quick to search and
421 modify. The algorithms are non-recursive, and the trees are highly
422 capacious.
423
424 See:
425
426 Documentation/core-api/assoc_array.rst
427
428 for more information.
429
430config HAS_IOMEM
431 bool
432 depends on !NO_IOMEM
433 select GENERIC_IO
434 default y
435
436config HAS_IOPORT_MAP
437 bool
438 depends on HAS_IOMEM && !NO_IOPORT_MAP
439 default y
440
441source "kernel/dma/Kconfig"
442
443config SGL_ALLOC
444 bool
445 default n
446
447config IOMMU_HELPER
448 bool
449
450config CHECK_SIGNATURE
451 bool
452
453config CPUMASK_OFFSTACK
454 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
455 help
456 Use dynamic allocation for cpumask_var_t, instead of putting
457 them on the stack. This is a bit more expensive, but avoids
458 stack overflow.
459
460config CPU_RMAP
461 bool
462 depends on SMP
463
464config DQL
465 bool
466
467config GLOB
468 bool
469# This actually supports modular compilation, but the module overhead
470# is ridiculous for the amount of code involved. Until an out-of-tree
471# driver asks for it, we'll just link it directly it into the kernel
472# when required. Since we're ignoring out-of-tree users, there's also
473# no need bother prompting for a manual decision:
474# prompt "glob_match() function"
475 help
476 This option provides a glob_match function for performing
477 simple text pattern matching. It originated in the ATA code
478 to blacklist particular drive models, but other device drivers
479 may need similar functionality.
480
481 All drivers in the Linux kernel tree that require this function
482 should automatically select this option. Say N unless you
483 are compiling an out-of tree driver which tells you that it
484 depends on this.
485
486config GLOB_SELFTEST
487 tristate "glob self-test on init"
488 depends on GLOB
489 help
490 This option enables a simple self-test of the glob_match
491 function on startup. It is primarily useful for people
492 working on the code to ensure they haven't introduced any
493 regressions.
494
495 It only adds a little bit of code and slows kernel boot (or
496 module load) by a small amount, so you're welcome to play with
497 it, but you probably don't need it.
498
499#
500# Netlink attribute parsing support is select'ed if needed
501#
502config NLATTR
503 bool
504
505#
506# Generic 64-bit atomic support is selected if needed
507#
508config GENERIC_ATOMIC64
509 bool
510
511config LRU_CACHE
512 tristate
513
514config CLZ_TAB
515 bool
516
517config CORDIC
518 tristate "CORDIC algorithm"
519 help
520 This option provides an implementation of the CORDIC algorithm;
521 calculations are in fixed point. Module will be called cordic.
522
523config DDR
524 bool "JEDEC DDR data"
525 help
526 Data from JEDEC specs for DDR SDRAM memories,
527 particularly the AC timing parameters and addressing
528 information. This data is useful for drivers handling
529 DDR SDRAM controllers.
530
531config IRQ_POLL
532 bool "IRQ polling library"
533 help
534 Helper library to poll interrupt mitigation using polling.
535
536config MPILIB
537 tristate
538 select CLZ_TAB
539 help
540 Multiprecision maths library from GnuPG.
541 It is used to implement RSA digital signature verification,
542 which is used by IMA/EVM digital signature extension.
543
544config SIGNATURE
545 tristate
546 depends on KEYS
547 select CRYPTO
548 select CRYPTO_SHA1
549 select MPILIB
550 help
551 Digital signature verification. Currently only RSA is supported.
552 Implementation is done using GnuPG MPI library
553
554#
555# libfdt files, only selected if needed.
556#
557config LIBFDT
558 bool
559
560config OID_REGISTRY
561 tristate
562 help
563 Enable fast lookup object identifier registry.
564
565config UCS2_STRING
566 tristate
567
568source "lib/fonts/Kconfig"
569
570config SG_SPLIT
571 def_bool n
572 help
573 Provides a helper to split scatterlists into chunks, each chunk being
574 a scatterlist. This should be selected by a driver or an API which
575 whishes to split a scatterlist amongst multiple DMA channels.
576
577config SG_POOL
578 def_bool n
579 help
580 Provides a helper to allocate chained scatterlists. This should be
581 selected by a driver or an API which whishes to allocate chained
582 scatterlist.
583
584#
585# sg chaining option
586#
587
588config ARCH_NO_SG_CHAIN
589 def_bool n
590
591config ARCH_HAS_PMEM_API
592 bool
593
594config ARCH_HAS_UACCESS_FLUSHCACHE
595 bool
596
597config ARCH_HAS_UACCESS_MCSAFE
598 bool
599
600config STACKDEPOT
601 bool
602 select STACKTRACE
603
604config SBITMAP
605 bool
606
607config PARMAN
608 tristate "parman" if COMPILE_TEST
609
610config PRIME_NUMBERS
611 tristate
612
613config STRING_SELFTEST
614 tristate "Test string functions"
615
616endmenu
617
618config GENERIC_LIB_ASHLDI3
619 bool
620
621config GENERIC_LIB_ASHRDI3
622 bool
623
624config GENERIC_LIB_LSHRDI3
625 bool
626
627config GENERIC_LIB_MULDI3
628 bool
629
630config GENERIC_LIB_CMPDI2
631 bool
632
633config GENERIC_LIB_UCMPDI2
634 bool
635
636config OBJAGG
637 tristate "objagg" if COMPILE_TEST