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 PACKING
 23	bool "Generic bitfield packing and unpacking"
 24	default n
 25	help
 26	  This option provides the packing() helper function, which permits
 27	  converting bitfields between a CPU-usable representation and a
 28	  memory representation that can have any combination of these quirks:
 29	    - Is little endian (bytes are reversed within a 32-bit group)
 30	    - The least-significant 32-bit word comes first (within a 64-bit
 31	      group)
 32	    - The most significant bit of a byte is at its right (bit 0 of a
 33	      register description is numerically 2^7).
 34	  Drivers may use these helpers to match the bit indices as described
 35	  in the data sheets of the peripherals they are in control of.
 36
 37	  When in doubt, say N.
 38
 39config BITREVERSE
 40	tristate
 41
 42config HAVE_ARCH_BITREVERSE
 43	bool
 44	default n
 45	depends on BITREVERSE
 46	help
 47	  This option enables the use of hardware bit-reversal instructions on
 48	  architectures which support such operations.
 49
 50config GENERIC_STRNCPY_FROM_USER
 51	bool
 52
 53config GENERIC_STRNLEN_USER
 54	bool
 55
 56config GENERIC_NET_UTILS
 57	bool
 58
 59config GENERIC_FIND_FIRST_BIT
 60	bool
 61
 62source "lib/math/Kconfig"
 63
 64config NO_GENERIC_PCI_IOPORT_MAP
 65	bool
 66
 67config GENERIC_PCI_IOMAP
 68	bool
 69
 70config GENERIC_IOMAP
 71	bool
 72	select GENERIC_PCI_IOMAP
 73
 74config STMP_DEVICE
 75	bool
 76
 77config ARCH_USE_CMPXCHG_LOCKREF
 78	bool
 79
 80config ARCH_HAS_FAST_MULTIPLIER
 81	bool
 82
 
 
 
 83config INDIRECT_PIO
 84	bool "Access I/O in non-MMIO mode"
 85	depends on ARM64
 86	help
 87	  On some platforms where no separate I/O space exists, there are I/O
 88	  hosts which can not be accessed in MMIO mode. Using the logical PIO
 89	  mechanism, the host-local I/O resource can be mapped into system
 90	  logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
 91	  system can access the I/O devices with the mapped-logic PIO through
 92	  I/O accessors.
 93
 94	  This way has relatively little I/O performance cost. Please make
 95	  sure your devices really need this configure item enabled.
 96
 97	  When in doubt, say N.
 98
 99config CRC_CCITT
100	tristate "CRC-CCITT functions"
101	help
102	  This option is provided for the case where no in-kernel-tree
103	  modules require CRC-CCITT functions, but a module built outside
104	  the kernel tree does. Such modules that use library CRC-CCITT
105	  functions require M here.
106
107config CRC16
108	tristate "CRC16 functions"
109	help
110	  This option is provided for the case where no in-kernel-tree
111	  modules require CRC16 functions, but a module built outside
112	  the kernel tree does. Such modules that use library CRC16
113	  functions require M here.
114
115config CRC_T10DIF
116	tristate "CRC calculation for the T10 Data Integrity Field"
117	select CRYPTO
118	select CRYPTO_CRCT10DIF
119	help
120	  This option is only needed if a module that's not in the
121	  kernel tree needs to calculate CRC checks for use with the
122	  SCSI data integrity subsystem.
123
124config CRC_ITU_T
125	tristate "CRC ITU-T V.41 functions"
126	help
127	  This option is provided for the case where no in-kernel-tree
128	  modules require CRC ITU-T V.41 functions, but a module built outside
129	  the kernel tree does. Such modules that use library CRC ITU-T V.41
130	  functions require M here.
131
132config CRC32
133	tristate "CRC32/CRC32c functions"
134	default y
135	select BITREVERSE
136	help
137	  This option is provided for the case where no in-kernel-tree
138	  modules require CRC32/CRC32c functions, but a module built outside
139	  the kernel tree does. Such modules that use library CRC32/CRC32c
140	  functions require M here.
141
142config CRC32_SELFTEST
143	tristate "CRC32 perform self test on init"
144	depends on CRC32
145	help
146	  This option enables the CRC32 library functions to perform a
147	  self test on initialization. The self test computes crc32_le
148	  and crc32_be over byte strings with random alignment and length
149	  and computes the total elapsed time and number of bytes processed.
150
151choice
152	prompt "CRC32 implementation"
153	depends on CRC32
154	default CRC32_SLICEBY8
155	help
156	  This option allows a kernel builder to override the default choice
157	  of CRC32 algorithm.  Choose the default ("slice by 8") unless you
158	  know that you need one of the others.
159
160config CRC32_SLICEBY8
161	bool "Slice by 8 bytes"
162	help
163	  Calculate checksum 8 bytes at a time with a clever slicing algorithm.
164	  This is the fastest algorithm, but comes with a 8KiB lookup table.
165	  Most modern processors have enough cache to hold this table without
166	  thrashing the cache.
167
168	  This is the default implementation choice.  Choose this one unless
169	  you have a good reason not to.
170
171config CRC32_SLICEBY4
172	bool "Slice by 4 bytes"
173	help
174	  Calculate checksum 4 bytes at a time with a clever slicing algorithm.
175	  This is a bit slower than slice by 8, but has a smaller 4KiB lookup
176	  table.
177
178	  Only choose this option if you know what you are doing.
179
180config CRC32_SARWATE
181	bool "Sarwate's Algorithm (one byte at a time)"
182	help
183	  Calculate checksum a byte at a time using Sarwate's algorithm.  This
184	  is not particularly fast, but has a small 256 byte lookup table.
185
186	  Only choose this option if you know what you are doing.
187
188config CRC32_BIT
189	bool "Classic Algorithm (one bit at a time)"
190	help
191	  Calculate checksum one bit at a time.  This is VERY slow, but has
192	  no lookup table.  This is provided as a debugging option.
193
194	  Only choose this option if you are debugging crc32.
195
196endchoice
197
198config CRC64
199	tristate "CRC64 functions"
200	help
201	  This option is provided for the case where no in-kernel-tree
202	  modules require CRC64 functions, but a module built outside
203	  the kernel tree does. Such modules that use library CRC64
204	  functions require M here.
205
206config CRC4
207	tristate "CRC4 functions"
208	help
209	  This option is provided for the case where no in-kernel-tree
210	  modules require CRC4 functions, but a module built outside
211	  the kernel tree does. Such modules that use library CRC4
212	  functions require M here.
213
214config CRC7
215	tristate "CRC7 functions"
216	help
217	  This option is provided for the case where no in-kernel-tree
218	  modules require CRC7 functions, but a module built outside
219	  the kernel tree does. Such modules that use library CRC7
220	  functions require M here.
221
222config LIBCRC32C
223	tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
224	select CRYPTO
225	select CRYPTO_CRC32C
226	help
227	  This option is provided for the case where no in-kernel-tree
228	  modules require CRC32c functions, but a module built outside the
229	  kernel tree does. Such modules that use library CRC32c functions
230	  require M here.  See Castagnoli93.
231	  Module will be libcrc32c.
232
233config CRC8
234	tristate "CRC8 function"
235	help
236	  This option provides CRC8 function. Drivers may select this
237	  when they need to do cyclic redundancy check according CRC8
238	  algorithm. Module will be called crc8.
239
240config XXHASH
241	tristate
242
243config AUDIT_GENERIC
244	bool
245	depends on AUDIT && !AUDIT_ARCH
246	default y
247
248config AUDIT_ARCH_COMPAT_GENERIC
249	bool
250	default n
251
252config AUDIT_COMPAT_GENERIC
253	bool
254	depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
255	default y
256
257config RANDOM32_SELFTEST
258	bool "PRNG perform self test on init"
259	help
260	  This option enables the 32 bit PRNG library functions to perform a
261	  self test on initialization.
262
263#
264# compression support is select'ed if needed
265#
266config 842_COMPRESS
267	select CRC32
268	tristate
269
270config 842_DECOMPRESS
271	select CRC32
272	tristate
273
274config ZLIB_INFLATE
275	tristate
276
277config ZLIB_DEFLATE
278	tristate
279	select BITREVERSE
280
 
 
 
 
 
 
 
281config LZO_COMPRESS
282	tristate
283
284config LZO_DECOMPRESS
285	tristate
286
287config LZ4_COMPRESS
288	tristate
289
290config LZ4HC_COMPRESS
291	tristate
292
293config LZ4_DECOMPRESS
294	tristate
295
296config ZSTD_COMPRESS
297	select XXHASH
298	tristate
299
300config ZSTD_DECOMPRESS
301	select XXHASH
302	tristate
303
304source "lib/xz/Kconfig"
305
306#
307# These all provide a common interface (hence the apparent duplication with
308# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
309#
310config DECOMPRESS_GZIP
311	select ZLIB_INFLATE
312	tristate
313
314config DECOMPRESS_BZIP2
315	tristate
316
317config DECOMPRESS_LZMA
318	tristate
319
320config DECOMPRESS_XZ
321	select XZ_DEC
322	tristate
323
324config DECOMPRESS_LZO
325	select LZO_DECOMPRESS
326	tristate
327
328config DECOMPRESS_LZ4
329	select LZ4_DECOMPRESS
330	tristate
331
 
 
 
 
332#
333# Generic allocator support is selected if needed
334#
335config GENERIC_ALLOCATOR
336	bool
337
338#
339# reed solomon support is select'ed if needed
340#
341config REED_SOLOMON
342	tristate
343	
344config REED_SOLOMON_ENC8
345	bool
346
347config REED_SOLOMON_DEC8
348	bool
349
350config REED_SOLOMON_ENC16
351	bool
352
353config REED_SOLOMON_DEC16
354	bool
355
356#
357# BCH support is selected if needed
358#
359config BCH
360	tristate
361
362config BCH_CONST_PARAMS
363	bool
364	help
365	  Drivers may select this option to force specific constant
366	  values for parameters 'm' (Galois field order) and 't'
367	  (error correction capability). Those specific values must
368	  be set by declaring default values for symbols BCH_CONST_M
369	  and BCH_CONST_T.
370	  Doing so will enable extra compiler optimizations,
371	  improving encoding and decoding performance up to 2x for
372	  usual (m,t) values (typically such that m*t < 200).
373	  When this option is selected, the BCH library supports
374	  only a single (m,t) configuration. This is mainly useful
375	  for NAND flash board drivers requiring known, fixed BCH
376	  parameters.
377
378config BCH_CONST_M
379	int
380	range 5 15
381	help
382	  Constant value for Galois field order 'm'. If 'k' is the
383	  number of data bits to protect, 'm' should be chosen such
384	  that (k + m*t) <= 2**m - 1.
385	  Drivers should declare a default value for this symbol if
386	  they select option BCH_CONST_PARAMS.
387
388config BCH_CONST_T
389	int
390	help
391	  Constant value for error correction capability in bits 't'.
392	  Drivers should declare a default value for this symbol if
393	  they select option BCH_CONST_PARAMS.
394
395#
396# Textsearch support is select'ed if needed
397#
398config TEXTSEARCH
399	bool
400
401config TEXTSEARCH_KMP
402	tristate
403
404config TEXTSEARCH_BM
405	tristate
406
407config TEXTSEARCH_FSM
408	tristate
409
410config BTREE
411	bool
412
413config INTERVAL_TREE
414	bool
415	help
416	  Simple, embeddable, interval-tree. Can find the start of an
417	  overlapping range in log(n) time and then iterate over all
418	  overlapping nodes. The algorithm is implemented as an
419	  augmented rbtree.
420
421	  See:
422
423		Documentation/rbtree.txt
424
425	  for more information.
426
427config XARRAY_MULTI
428	bool
429	help
430	  Support entries which occupy multiple consecutive indices in the
431	  XArray.
432
433config ASSOCIATIVE_ARRAY
434	bool
435	help
436	  Generic associative array.  Can be searched and iterated over whilst
437	  it is being modified.  It is also reasonably quick to search and
438	  modify.  The algorithms are non-recursive, and the trees are highly
439	  capacious.
440
441	  See:
442
443		Documentation/core-api/assoc_array.rst
444
445	  for more information.
446
447config HAS_IOMEM
448	bool
449	depends on !NO_IOMEM
450	default y
451
452config HAS_IOPORT_MAP
453	bool
454	depends on HAS_IOMEM && !NO_IOPORT_MAP
455	default y
456
457source "kernel/dma/Kconfig"
458
459config SGL_ALLOC
460	bool
461	default n
462
463config IOMMU_HELPER
464	bool
465
466config CHECK_SIGNATURE
467	bool
468
469config CPUMASK_OFFSTACK
470	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
471	help
472	  Use dynamic allocation for cpumask_var_t, instead of putting
473	  them on the stack.  This is a bit more expensive, but avoids
474	  stack overflow.
475
476config CPU_RMAP
477	bool
478	depends on SMP
479
480config DQL
481	bool
482
483config GLOB
484	bool
485#	This actually supports modular compilation, but the module overhead
486#	is ridiculous for the amount of code involved.	Until an out-of-tree
487#	driver asks for it, we'll just link it directly it into the kernel
488#	when required.  Since we're ignoring out-of-tree users,	there's also
489#	no need bother prompting for a manual decision:
490#	prompt "glob_match() function"
491	help
492	  This option provides a glob_match function for performing
493	  simple text pattern matching.  It originated in the ATA code
494	  to blacklist particular drive models, but other device drivers
495	  may need similar functionality.
496
497	  All drivers in the Linux kernel tree that require this function
498	  should automatically select this option.  Say N unless you
499	  are compiling an out-of tree driver which tells you that it
500	  depends on this.
501
502config GLOB_SELFTEST
503	tristate "glob self-test on init"
504	depends on GLOB
505	help
506	  This option enables a simple self-test of the glob_match
507	  function on startup.	It is primarily useful for people
508	  working on the code to ensure they haven't introduced any
509	  regressions.
510
511	  It only adds a little bit of code and slows kernel boot (or
512	  module load) by a small amount, so you're welcome to play with
513	  it, but you probably don't need it.
514
515#
516# Netlink attribute parsing support is select'ed if needed
517#
518config NLATTR
519	bool
520
521#
522# Generic 64-bit atomic support is selected if needed
523#
524config GENERIC_ATOMIC64
525       bool
526
527config LRU_CACHE
528	tristate
529
530config CLZ_TAB
531	bool
532
533config IRQ_POLL
534	bool "IRQ polling library"
535	help
536	  Helper library to poll interrupt mitigation using polling.
537
538config MPILIB
539	tristate
540	select CLZ_TAB
541	help
542	  Multiprecision maths library from GnuPG.
543	  It is used to implement RSA digital signature verification,
544	  which is used by IMA/EVM digital signature extension.
545
546config SIGNATURE
547	tristate
548	depends on KEYS
549	select CRYPTO
550	select CRYPTO_SHA1
551	select MPILIB
552	help
553	  Digital signature verification. Currently only RSA is supported.
554	  Implementation is done using GnuPG MPI library
555
556config DIMLIB
557	bool
558	help
559	  Dynamic Interrupt Moderation library.
560	  Implements an algorithm for dynamically changing CQ moderation values
561	  according to run time performance.
562
563#
564# libfdt files, only selected if needed.
565#
566config LIBFDT
567	bool
568
569config OID_REGISTRY
570	tristate
571	help
572	  Enable fast lookup object identifier registry.
573
574config UCS2_STRING
575        tristate
576
577#
578# generic vdso
579#
580source "lib/vdso/Kconfig"
581
582source "lib/fonts/Kconfig"
583
584config SG_SPLIT
585	def_bool n
586	help
587	 Provides a helper to split scatterlists into chunks, each chunk being
588	 a scatterlist. This should be selected by a driver or an API which
589	 whishes to split a scatterlist amongst multiple DMA channels.
590
591config SG_POOL
592	def_bool n
593	help
594	 Provides a helper to allocate chained scatterlists. This should be
595	 selected by a driver or an API which whishes to allocate chained
596	 scatterlist.
597
598#
599# sg chaining option
600#
601
602config ARCH_NO_SG_CHAIN
603	def_bool n
604
605config ARCH_HAS_PMEM_API
606	bool
607
 
 
 
 
 
 
608# use memcpy to implement user copies for nommu architectures
609config UACCESS_MEMCPY
610	bool
611
612config ARCH_HAS_UACCESS_FLUSHCACHE
613	bool
614
615config ARCH_HAS_UACCESS_MCSAFE
616	bool
617
618# Temporary. Goes away when all archs are cleaned up
619config ARCH_STACKWALK
620       bool
621
622config STACKDEPOT
623	bool
624	select STACKTRACE
625
626config SBITMAP
627	bool
628
629config PARMAN
630	tristate "parman" if COMPILE_TEST
631
632config OBJAGG
633	tristate "objagg" if COMPILE_TEST
634
635config STRING_SELFTEST
636	tristate "Test string functions"
637
638endmenu
639
 
 
 
640config GENERIC_LIB_ASHLDI3
641	bool
642
643config GENERIC_LIB_ASHRDI3
644	bool
645
646config GENERIC_LIB_LSHRDI3
647	bool
648
649config GENERIC_LIB_MULDI3
650	bool
651
652config GENERIC_LIB_CMPDI2
653	bool
654
655config GENERIC_LIB_UCMPDI2
656	bool

  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	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 CRC_CCITT
106	tristate "CRC-CCITT functions"
107	help
108	  This option is provided for the case where no in-kernel-tree
109	  modules require CRC-CCITT functions, but a module built outside
110	  the kernel tree does. Such modules that use library CRC-CCITT
111	  functions require M here.
112
113config CRC16
114	tristate "CRC16 functions"
115	help
116	  This option is provided for the case where no in-kernel-tree
117	  modules require CRC16 functions, but a module built outside
118	  the kernel tree does. Such modules that use library CRC16
119	  functions require M here.
120
121config CRC_T10DIF
122	tristate "CRC calculation for the T10 Data Integrity Field"
123	select CRYPTO
124	select CRYPTO_CRCT10DIF
125	help
126	  This option is only needed if a module that's not in the
127	  kernel tree needs to calculate CRC checks for use with the
128	  SCSI data integrity subsystem.
129
130config CRC_ITU_T
131	tristate "CRC ITU-T V.41 functions"
132	help
133	  This option is provided for the case where no in-kernel-tree
134	  modules require CRC ITU-T V.41 functions, but a module built outside
135	  the kernel tree does. Such modules that use library CRC ITU-T V.41
136	  functions require M here.
137
138config CRC32
139	tristate "CRC32/CRC32c functions"
140	default y
141	select BITREVERSE
142	help
143	  This option is provided for the case where no in-kernel-tree
144	  modules require CRC32/CRC32c functions, but a module built outside
145	  the kernel tree does. Such modules that use library CRC32/CRC32c
146	  functions require M here.
147
148config CRC32_SELFTEST
149	tristate "CRC32 perform self test on init"
150	depends on CRC32
151	help
152	  This option enables the CRC32 library functions to perform a
153	  self test on initialization. The self test computes crc32_le
154	  and crc32_be over byte strings with random alignment and length
155	  and computes the total elapsed time and number of bytes processed.
156
157choice
158	prompt "CRC32 implementation"
159	depends on CRC32
160	default CRC32_SLICEBY8
161	help
162	  This option allows a kernel builder to override the default choice
163	  of CRC32 algorithm.  Choose the default ("slice by 8") unless you
164	  know that you need one of the others.
165
166config CRC32_SLICEBY8
167	bool "Slice by 8 bytes"
168	help
169	  Calculate checksum 8 bytes at a time with a clever slicing algorithm.
170	  This is the fastest algorithm, but comes with a 8KiB lookup table.
171	  Most modern processors have enough cache to hold this table without
172	  thrashing the cache.
173
174	  This is the default implementation choice.  Choose this one unless
175	  you have a good reason not to.
176
177config CRC32_SLICEBY4
178	bool "Slice by 4 bytes"
179	help
180	  Calculate checksum 4 bytes at a time with a clever slicing algorithm.
181	  This is a bit slower than slice by 8, but has a smaller 4KiB lookup
182	  table.
183
184	  Only choose this option if you know what you are doing.
185
186config CRC32_SARWATE
187	bool "Sarwate's Algorithm (one byte at a time)"
188	help
189	  Calculate checksum a byte at a time using Sarwate's algorithm.  This
190	  is not particularly fast, but has a small 256 byte lookup table.
191
192	  Only choose this option if you know what you are doing.
193
194config CRC32_BIT
195	bool "Classic Algorithm (one bit at a time)"
196	help
197	  Calculate checksum one bit at a time.  This is VERY slow, but has
198	  no lookup table.  This is provided as a debugging option.
199
200	  Only choose this option if you are debugging crc32.
201
202endchoice
203
204config CRC64
205	tristate "CRC64 functions"
206	help
207	  This option is provided for the case where no in-kernel-tree
208	  modules require CRC64 functions, but a module built outside
209	  the kernel tree does. Such modules that use library CRC64
210	  functions require M here.
211
212config CRC4
213	tristate "CRC4 functions"
214	help
215	  This option is provided for the case where no in-kernel-tree
216	  modules require CRC4 functions, but a module built outside
217	  the kernel tree does. Such modules that use library CRC4
218	  functions require M here.
219
220config CRC7
221	tristate "CRC7 functions"
222	help
223	  This option is provided for the case where no in-kernel-tree
224	  modules require CRC7 functions, but a module built outside
225	  the kernel tree does. Such modules that use library CRC7
226	  functions require M here.
227
228config LIBCRC32C
229	tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
230	select CRYPTO
231	select CRYPTO_CRC32C
232	help
233	  This option is provided for the case where no in-kernel-tree
234	  modules require CRC32c functions, but a module built outside the
235	  kernel tree does. Such modules that use library CRC32c functions
236	  require M here.  See Castagnoli93.
237	  Module will be libcrc32c.
238
239config CRC8
240	tristate "CRC8 function"
241	help
242	  This option provides CRC8 function. Drivers may select this
243	  when they need to do cyclic redundancy check according CRC8
244	  algorithm. Module will be called crc8.
245
246config XXHASH
247	tristate
248
249config AUDIT_GENERIC
250	bool
251	depends on AUDIT && !AUDIT_ARCH
252	default y
253
254config AUDIT_ARCH_COMPAT_GENERIC
255	bool
256	default n
257
258config AUDIT_COMPAT_GENERIC
259	bool
260	depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
261	default y
262
263config RANDOM32_SELFTEST
264	bool "PRNG perform self test on init"
265	help
266	  This option enables the 32 bit PRNG library functions to perform a
267	  self test on initialization.
268
269#
270# compression support is select'ed if needed
271#
272config 842_COMPRESS
273	select CRC32
274	tristate
275
276config 842_DECOMPRESS
277	select CRC32
278	tristate
279
280config ZLIB_INFLATE
281	tristate
282
283config ZLIB_DEFLATE
284	tristate
285	select BITREVERSE
286
287config ZLIB_DFLTCC
288	def_bool y
289	depends on S390
290	prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
291	help
292	 Enable s390x hardware support for zlib in the kernel.
293
294config LZO_COMPRESS
295	tristate
296
297config LZO_DECOMPRESS
298	tristate
299
300config LZ4_COMPRESS
301	tristate
302
303config LZ4HC_COMPRESS
304	tristate
305
306config LZ4_DECOMPRESS
307	tristate
308
309config ZSTD_COMPRESS
310	select XXHASH
311	tristate
312
313config ZSTD_DECOMPRESS
314	select XXHASH
315	tristate
316
317source "lib/xz/Kconfig"
318
319#
320# These all provide a common interface (hence the apparent duplication with
321# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
322#
323config DECOMPRESS_GZIP
324	select ZLIB_INFLATE
325	tristate
326
327config DECOMPRESS_BZIP2
328	tristate
329
330config DECOMPRESS_LZMA
331	tristate
332
333config DECOMPRESS_XZ
334	select XZ_DEC
335	tristate
336
337config DECOMPRESS_LZO
338	select LZO_DECOMPRESS
339	tristate
340
341config DECOMPRESS_LZ4
342	select LZ4_DECOMPRESS
343	tristate
344
345config DECOMPRESS_ZSTD
346	select ZSTD_DECOMPRESS
347	tristate
348
349#
350# Generic allocator support is selected if needed
351#
352config GENERIC_ALLOCATOR
353	bool
354
355#
356# reed solomon support is select'ed if needed
357#
358config REED_SOLOMON
359	tristate
360	
361config REED_SOLOMON_ENC8
362	bool
363
364config REED_SOLOMON_DEC8
365	bool
366
367config REED_SOLOMON_ENC16
368	bool
369
370config REED_SOLOMON_DEC16
371	bool
372
373#
374# BCH support is selected if needed
375#
376config BCH
377	tristate
378
379config BCH_CONST_PARAMS
380	bool
381	help
382	  Drivers may select this option to force specific constant
383	  values for parameters 'm' (Galois field order) and 't'
384	  (error correction capability). Those specific values must
385	  be set by declaring default values for symbols BCH_CONST_M
386	  and BCH_CONST_T.
387	  Doing so will enable extra compiler optimizations,
388	  improving encoding and decoding performance up to 2x for
389	  usual (m,t) values (typically such that m*t < 200).
390	  When this option is selected, the BCH library supports
391	  only a single (m,t) configuration. This is mainly useful
392	  for NAND flash board drivers requiring known, fixed BCH
393	  parameters.
394
395config BCH_CONST_M
396	int
397	range 5 15
398	help
399	  Constant value for Galois field order 'm'. If 'k' is the
400	  number of data bits to protect, 'm' should be chosen such
401	  that (k + m*t) <= 2**m - 1.
402	  Drivers should declare a default value for this symbol if
403	  they select option BCH_CONST_PARAMS.
404
405config BCH_CONST_T
406	int
407	help
408	  Constant value for error correction capability in bits 't'.
409	  Drivers should declare a default value for this symbol if
410	  they select option BCH_CONST_PARAMS.
411
412#
413# Textsearch support is select'ed if needed
414#
415config TEXTSEARCH
416	bool
417
418config TEXTSEARCH_KMP
419	tristate
420
421config TEXTSEARCH_BM
422	tristate
423
424config TEXTSEARCH_FSM
425	tristate
426
427config BTREE
428	bool
429
430config INTERVAL_TREE
431	bool
432	help
433	  Simple, embeddable, interval-tree. Can find the start of an
434	  overlapping range in log(n) time and then iterate over all
435	  overlapping nodes. The algorithm is implemented as an
436	  augmented rbtree.
437
438	  See:
439
440		Documentation/core-api/rbtree.rst
441
442	  for more information.
443
444config XARRAY_MULTI
445	bool
446	help
447	  Support entries which occupy multiple consecutive indices in the
448	  XArray.
449
450config ASSOCIATIVE_ARRAY
451	bool
452	help
453	  Generic associative array.  Can be searched and iterated over whilst
454	  it is being modified.  It is also reasonably quick to search and
455	  modify.  The algorithms are non-recursive, and the trees are highly
456	  capacious.
457
458	  See:
459
460		Documentation/core-api/assoc_array.rst
461
462	  for more information.
463
464config HAS_IOMEM
465	bool
466	depends on !NO_IOMEM
467	default y
468
469config HAS_IOPORT_MAP
470	bool
471	depends on HAS_IOMEM && !NO_IOPORT_MAP
472	default y
473
474source "kernel/dma/Kconfig"
475
476config SGL_ALLOC
477	bool
478	default n
479
480config IOMMU_HELPER
481	bool
482
483config CHECK_SIGNATURE
484	bool
485
486config CPUMASK_OFFSTACK
487	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
488	help
489	  Use dynamic allocation for cpumask_var_t, instead of putting
490	  them on the stack.  This is a bit more expensive, but avoids
491	  stack overflow.
492
493config CPU_RMAP
494	bool
495	depends on SMP
496
497config DQL
498	bool
499
500config GLOB
501	bool
502#	This actually supports modular compilation, but the module overhead
503#	is ridiculous for the amount of code involved.	Until an out-of-tree
504#	driver asks for it, we'll just link it directly it into the kernel
505#	when required.  Since we're ignoring out-of-tree users,	there's also
506#	no need bother prompting for a manual decision:
507#	prompt "glob_match() function"
508	help
509	  This option provides a glob_match function for performing
510	  simple text pattern matching.  It originated in the ATA code
511	  to blacklist particular drive models, but other device drivers
512	  may need similar functionality.
513
514	  All drivers in the Linux kernel tree that require this function
515	  should automatically select this option.  Say N unless you
516	  are compiling an out-of tree driver which tells you that it
517	  depends on this.
518
519config GLOB_SELFTEST
520	tristate "glob self-test on init"
521	depends on GLOB
522	help
523	  This option enables a simple self-test of the glob_match
524	  function on startup.	It is primarily useful for people
525	  working on the code to ensure they haven't introduced any
526	  regressions.
527
528	  It only adds a little bit of code and slows kernel boot (or
529	  module load) by a small amount, so you're welcome to play with
530	  it, but you probably don't need it.
531
532#
533# Netlink attribute parsing support is select'ed if needed
534#
535config NLATTR
536	bool
537
538#
539# Generic 64-bit atomic support is selected if needed
540#
541config GENERIC_ATOMIC64
542       bool
543
544config LRU_CACHE
545	tristate
546
547config CLZ_TAB
548	bool
549
550config IRQ_POLL
551	bool "IRQ polling library"
552	help
553	  Helper library to poll interrupt mitigation using polling.
554
555config MPILIB
556	tristate
557	select CLZ_TAB
558	help
559	  Multiprecision maths library from GnuPG.
560	  It is used to implement RSA digital signature verification,
561	  which is used by IMA/EVM digital signature extension.
562
563config SIGNATURE
564	tristate
565	depends on KEYS
566	select CRYPTO
567	select CRYPTO_SHA1
568	select MPILIB
569	help
570	  Digital signature verification. Currently only RSA is supported.
571	  Implementation is done using GnuPG MPI library
572
573config DIMLIB
574	bool
575	help
576	  Dynamic Interrupt Moderation library.
577	  Implements an algorithm for dynamically changing CQ moderation values
578	  according to run time performance.
579
580#
581# libfdt files, only selected if needed.
582#
583config LIBFDT
584	bool
585
586config OID_REGISTRY
587	tristate
588	help
589	  Enable fast lookup object identifier registry.
590
591config UCS2_STRING
592	tristate
593
594#
595# generic vdso
596#
597source "lib/vdso/Kconfig"
598
599source "lib/fonts/Kconfig"
600
601config SG_SPLIT
602	def_bool n
603	help
604	 Provides a helper to split scatterlists into chunks, each chunk being
605	 a scatterlist. This should be selected by a driver or an API which
606	 whishes to split a scatterlist amongst multiple DMA channels.
607
608config SG_POOL
609	def_bool n
610	help
611	 Provides a helper to allocate chained scatterlists. This should be
612	 selected by a driver or an API which whishes to allocate chained
613	 scatterlist.
614
615#
616# sg chaining option
617#
618
619config ARCH_NO_SG_CHAIN
620	def_bool n
621
622config ARCH_HAS_PMEM_API
623	bool
624
625config MEMREGION
626	bool
627
628config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
629	bool
630
631# use memcpy to implement user copies for nommu architectures
632config UACCESS_MEMCPY
633	bool
634
635config ARCH_HAS_UACCESS_FLUSHCACHE
636	bool
637
638config ARCH_HAS_UACCESS_MCSAFE
639	bool
640
641# Temporary. Goes away when all archs are cleaned up
642config ARCH_STACKWALK
643       bool
644
645config STACKDEPOT
646	bool
647	select STACKTRACE
648
649config SBITMAP
650	bool
651
652config PARMAN
653	tristate "parman" if COMPILE_TEST
654
655config OBJAGG
656	tristate "objagg" if COMPILE_TEST
657
658config STRING_SELFTEST
659	tristate "Test string functions"
660
661endmenu
662
663config GENERIC_IOREMAP
664	bool
665
666config GENERIC_LIB_ASHLDI3
667	bool
668
669config GENERIC_LIB_ASHRDI3
670	bool
671
672config GENERIC_LIB_LSHRDI3
673	bool
674
675config GENERIC_LIB_MULDI3
676	bool
677
678config GENERIC_LIB_CMPDI2
679	bool
680
681config GENERIC_LIB_UCMPDI2
682	bool
683
684config PLDMFW
685	bool
686	default n