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