Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 PACKING_KUNIT_TEST
44 tristate "KUnit tests for packing library" if !KUNIT_ALL_TESTS
45 depends on PACKING && KUNIT
46 default KUNIT_ALL_TESTS
47 help
48 This builds KUnit tests for the packing library.
49
50 For more information on KUnit and unit tests in general,
51 please refer to the KUnit documentation in Documentation/dev-tools/kunit/.
52
53 When in doubt, say N.
54
55config BITREVERSE
56 tristate
57
58config HAVE_ARCH_BITREVERSE
59 bool
60 default n
61 help
62 This option enables the use of hardware bit-reversal instructions on
63 architectures which support such operations.
64
65config ARCH_HAS_STRNCPY_FROM_USER
66 bool
67
68config ARCH_HAS_STRNLEN_USER
69 bool
70
71config GENERIC_STRNCPY_FROM_USER
72 def_bool !ARCH_HAS_STRNCPY_FROM_USER
73
74config GENERIC_STRNLEN_USER
75 def_bool !ARCH_HAS_STRNLEN_USER
76
77config GENERIC_NET_UTILS
78 bool
79
80source "lib/math/Kconfig"
81
82config NO_GENERIC_PCI_IOPORT_MAP
83 bool
84
85config GENERIC_IOMAP
86 bool
87 select GENERIC_PCI_IOMAP
88
89config STMP_DEVICE
90 bool
91
92config ARCH_USE_CMPXCHG_LOCKREF
93 bool
94
95config ARCH_HAS_FAST_MULTIPLIER
96 bool
97
98config ARCH_USE_SYM_ANNOTATIONS
99 bool
100
101config INDIRECT_PIO
102 bool "Access I/O in non-MMIO mode"
103 depends on ARM64
104 depends on HAS_IOPORT
105 help
106 On some platforms where no separate I/O space exists, there are I/O
107 hosts which can not be accessed in MMIO mode. Using the logical PIO
108 mechanism, the host-local I/O resource can be mapped into system
109 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
110 system can access the I/O devices with the mapped-logic PIO through
111 I/O accessors.
112
113 This way has relatively little I/O performance cost. Please make
114 sure your devices really need this configure item enabled.
115
116 When in doubt, say N.
117
118config INDIRECT_IOMEM
119 bool
120 help
121 This is selected by other options/architectures to provide the
122 emulated iomem accessors.
123
124config INDIRECT_IOMEM_FALLBACK
125 bool
126 depends on INDIRECT_IOMEM
127 help
128 If INDIRECT_IOMEM is selected, this enables falling back to plain
129 mmio accesses when the IO memory address is not a registered
130 emulated region.
131
132config TRACE_MMIO_ACCESS
133 bool "Register read/write tracing"
134 depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS
135 help
136 Create tracepoints for MMIO read/write operations. These trace events
137 can be used for logging all MMIO read/write operations.
138
139source "lib/crc/Kconfig"
140source "lib/crypto/Kconfig"
141
142config XXHASH
143 tristate
144
145config AUDIT_GENERIC
146 bool
147 depends on AUDIT && !AUDIT_ARCH
148 default y
149
150config AUDIT_ARCH_COMPAT_GENERIC
151 bool
152 default n
153
154config AUDIT_COMPAT_GENERIC
155 bool
156 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
157 default y
158
159config RANDOM32_SELFTEST
160 bool "PRNG perform self test on init"
161 help
162 This option enables the 32 bit PRNG library functions to perform a
163 self test on initialization.
164
165#
166# compression support is select'ed if needed
167#
168config 842_COMPRESS
169 select CRC32
170 tristate
171
172config 842_DECOMPRESS
173 select CRC32
174 tristate
175
176config ZLIB_INFLATE
177 tristate
178
179config ZLIB_DEFLATE
180 tristate
181 select BITREVERSE
182
183config ZLIB_DFLTCC
184 def_bool y
185 depends on S390
186 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
187 help
188 Enable s390x hardware support for zlib in the kernel.
189
190config LZO_COMPRESS
191 tristate
192
193config LZO_DECOMPRESS
194 tristate
195
196config LZ4_COMPRESS
197 tristate
198
199config LZ4HC_COMPRESS
200 tristate
201
202config LZ4_DECOMPRESS
203 tristate
204
205config ZSTD_COMMON
206 select XXHASH
207 tristate
208
209config ZSTD_COMPRESS
210 select ZSTD_COMMON
211 tristate
212
213config ZSTD_DECOMPRESS
214 select ZSTD_COMMON
215 tristate
216
217source "lib/xz/Kconfig"
218
219#
220# These all provide a common interface (hence the apparent duplication with
221# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
222#
223config DECOMPRESS_GZIP
224 select ZLIB_INFLATE
225 tristate
226
227config DECOMPRESS_BZIP2
228 tristate
229
230config DECOMPRESS_LZMA
231 tristate
232
233config DECOMPRESS_XZ
234 select XZ_DEC
235 tristate
236
237config DECOMPRESS_LZO
238 select LZO_DECOMPRESS
239 tristate
240
241config DECOMPRESS_LZ4
242 select LZ4_DECOMPRESS
243 tristate
244
245config DECOMPRESS_ZSTD
246 select ZSTD_DECOMPRESS
247 tristate
248
249#
250# Generic allocator support is selected if needed
251#
252config GENERIC_ALLOCATOR
253 bool
254
255#
256# reed solomon support is select'ed if needed
257#
258config REED_SOLOMON
259 tristate
260
261config REED_SOLOMON_ENC8
262 bool
263
264config REED_SOLOMON_DEC8
265 bool
266
267config REED_SOLOMON_ENC16
268 bool
269
270config REED_SOLOMON_DEC16
271 bool
272
273#
274# BCH support is selected if needed
275#
276config BCH
277 tristate
278 select BITREVERSE
279
280config BCH_CONST_PARAMS
281 bool
282 help
283 Drivers may select this option to force specific constant
284 values for parameters 'm' (Galois field order) and 't'
285 (error correction capability). Those specific values must
286 be set by declaring default values for symbols BCH_CONST_M
287 and BCH_CONST_T.
288 Doing so will enable extra compiler optimizations,
289 improving encoding and decoding performance up to 2x for
290 usual (m,t) values (typically such that m*t < 200).
291 When this option is selected, the BCH library supports
292 only a single (m,t) configuration. This is mainly useful
293 for NAND flash board drivers requiring known, fixed BCH
294 parameters.
295
296config BCH_CONST_M
297 int
298 range 5 15
299 help
300 Constant value for Galois field order 'm'. If 'k' is the
301 number of data bits to protect, 'm' should be chosen such
302 that (k + m*t) <= 2**m - 1.
303 Drivers should declare a default value for this symbol if
304 they select option BCH_CONST_PARAMS.
305
306config BCH_CONST_T
307 int
308 help
309 Constant value for error correction capability in bits 't'.
310 Drivers should declare a default value for this symbol if
311 they select option BCH_CONST_PARAMS.
312
313#
314# Textsearch support is select'ed if needed
315#
316config TEXTSEARCH
317 bool
318
319config TEXTSEARCH_KMP
320 tristate
321
322config TEXTSEARCH_BM
323 tristate
324
325config TEXTSEARCH_FSM
326 tristate
327
328config BTREE
329 bool
330
331config INTERVAL_TREE
332 bool
333 help
334 Simple, embeddable, interval-tree. Can find the start of an
335 overlapping range in log(n) time and then iterate over all
336 overlapping nodes. The algorithm is implemented as an
337 augmented rbtree.
338
339 See:
340
341 Documentation/core-api/rbtree.rst
342
343 for more information.
344
345config INTERVAL_TREE_SPAN_ITER
346 bool
347 depends on INTERVAL_TREE
348
349config XARRAY_MULTI
350 bool
351 help
352 Support entries which occupy multiple consecutive indices in the
353 XArray.
354
355config ASSOCIATIVE_ARRAY
356 bool
357 help
358 Generic associative array. Can be searched and iterated over whilst
359 it is being modified. It is also reasonably quick to search and
360 modify. The algorithms are non-recursive, and the trees are highly
361 capacious.
362
363 See:
364
365 Documentation/core-api/assoc_array.rst
366
367 for more information.
368
369config CLOSURES
370 bool
371
372config HAS_IOMEM
373 bool
374 depends on !NO_IOMEM
375 default y
376
377config HAS_IOPORT
378 bool
379
380config HAS_IOPORT_MAP
381 bool
382 depends on HAS_IOMEM && !NO_IOPORT_MAP
383 default y
384
385source "kernel/dma/Kconfig"
386
387config SGL_ALLOC
388 bool
389 default n
390
391config IOMMU_HELPER
392 bool
393
394config CHECK_SIGNATURE
395 bool
396
397config CPUMASK_OFFSTACK
398 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
399 help
400 Use dynamic allocation for cpumask_var_t, instead of putting
401 them on the stack. This is a bit more expensive, but avoids
402 stack overflow.
403
404config FORCE_NR_CPUS
405 def_bool !SMP
406
407config CPU_RMAP
408 bool
409 depends on SMP
410
411config DQL
412 bool
413
414config GLOB
415 bool
416# This actually supports modular compilation, but the module overhead
417# is ridiculous for the amount of code involved. Until an out-of-tree
418# driver asks for it, we'll just link it directly it into the kernel
419# when required. Since we're ignoring out-of-tree users, there's also
420# no need bother prompting for a manual decision:
421# prompt "glob_match() function"
422 help
423 This option provides a glob_match function for performing
424 simple text pattern matching. It originated in the ATA code
425 to blacklist particular drive models, but other device drivers
426 may need similar functionality.
427
428 All drivers in the Linux kernel tree that require this function
429 should automatically select this option. Say N unless you
430 are compiling an out-of tree driver which tells you that it
431 depends on this.
432
433config GLOB_SELFTEST
434 tristate "glob self-test on init"
435 depends on GLOB
436 help
437 This option enables a simple self-test of the glob_match
438 function on startup. It is primarily useful for people
439 working on the code to ensure they haven't introduced any
440 regressions.
441
442 It only adds a little bit of code and slows kernel boot (or
443 module load) by a small amount, so you're welcome to play with
444 it, but you probably don't need it.
445
446#
447# Netlink attribute parsing support is select'ed if needed
448#
449config NLATTR
450 bool
451
452#
453# Generic 64-bit atomic support is selected if needed
454#
455config GENERIC_ATOMIC64
456 bool
457
458config LRU_CACHE
459 tristate
460
461config CLZ_TAB
462 bool
463
464config IRQ_POLL
465 bool "IRQ polling library"
466 help
467 Helper library to poll interrupt mitigation using polling.
468
469config MPILIB
470 tristate
471 select CLZ_TAB
472 help
473 Multiprecision maths library from GnuPG.
474 It is used to implement RSA digital signature verification,
475 which is used by IMA/EVM digital signature extension.
476
477config SIGNATURE
478 tristate
479 depends on KEYS
480 select CRYPTO_LIB_SHA1
481 select MPILIB
482 help
483 Digital signature verification. Currently only RSA is supported.
484 Implementation is done using GnuPG MPI library
485
486config DIMLIB
487 tristate
488 depends on NET
489 help
490 Dynamic Interrupt Moderation library.
491 Implements an algorithm for dynamically changing CQ moderation values
492 according to run time performance.
493
494#
495# libfdt files, only selected if needed.
496#
497config LIBFDT
498 bool
499
500config OID_REGISTRY
501 tristate
502 help
503 Enable fast lookup object identifier registry.
504
505config UCS2_STRING
506 tristate
507
508#
509# generic vdso
510#
511source "lib/vdso/Kconfig"
512
513source "lib/fonts/Kconfig"
514
515config SG_SPLIT
516 def_bool n
517 help
518 Provides a helper to split scatterlists into chunks, each chunk being
519 a scatterlist. This should be selected by a driver or an API which
520 whishes to split a scatterlist amongst multiple DMA channels.
521
522config SG_POOL
523 def_bool n
524 help
525 Provides a helper to allocate chained scatterlists. This should be
526 selected by a driver or an API which whishes to allocate chained
527 scatterlist.
528
529#
530# sg chaining option
531#
532
533config ARCH_NO_SG_CHAIN
534 def_bool n
535
536config ARCH_HAS_PMEM_API
537 bool
538
539config MEMREGION
540 bool
541
542config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
543 bool
544
545config GENERIC_CPU_CACHE_MAINTENANCE
546 bool
547
548config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
549 bool
550
551# use memcpy to implement user copies for nommu architectures
552config UACCESS_MEMCPY
553 bool
554
555config ARCH_HAS_UACCESS_FLUSHCACHE
556 bool
557
558# arch has a concept of a recoverable synchronous exception due to a
559# memory-read error like x86 machine-check or ARM data-abort, and
560# implements copy_mc_to_{user,kernel} to abort and report
561# 'bytes-transferred' if that exception fires when accessing the source
562# buffer.
563config ARCH_HAS_COPY_MC
564 bool
565
566# Temporary. Goes away when all archs are cleaned up
567config ARCH_STACKWALK
568 bool
569
570config STACKDEPOT
571 bool
572 select STACKTRACE
573 help
574 Stack depot: stack trace storage that avoids duplication
575
576config STACKDEPOT_ALWAYS_INIT
577 bool
578 select STACKDEPOT
579 help
580 Always initialize stack depot during early boot
581
582config STACKDEPOT_MAX_FRAMES
583 int "Maximum number of frames in trace saved in stack depot"
584 range 1 256
585 default 64
586 depends on STACKDEPOT
587
588config REF_TRACKER
589 bool
590 depends on STACKTRACE_SUPPORT
591 select STACKDEPOT
592
593config SBITMAP
594 bool
595
596config PARMAN
597 tristate "parman" if COMPILE_TEST
598
599config OBJAGG
600 tristate "objagg" if COMPILE_TEST
601
602config LWQ_TEST
603 bool "Boot-time test for lwq queuing"
604 help
605 Run boot-time test of light-weight queuing.
606
607endmenu
608
609config GENERIC_IOREMAP
610 bool
611
612config GENERIC_LIB_ASHLDI3
613 bool
614
615config GENERIC_LIB_ASHRDI3
616 bool
617
618config GENERIC_LIB_LSHRDI3
619 bool
620
621config GENERIC_LIB_MULDI3
622 bool
623
624config GENERIC_LIB_CMPDI2
625 bool
626
627config GENERIC_LIB_UCMPDI2
628 bool
629
630config GENERIC_LIB_DEVMEM_IS_ALLOWED
631 bool
632
633config PLDMFW
634 bool
635 select CRC32
636 default n
637
638config ASN1_ENCODER
639 tristate
640
641config POLYNOMIAL
642 tristate
643
644config FIRMWARE_TABLE
645 bool
646
647config UNION_FIND
648 bool
649
650config MIN_HEAP
651 bool