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	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 BITREVERSE
 44	tristate
 45
 46config HAVE_ARCH_BITREVERSE
 47	bool
 48	default n
 
 49	help
 50	  This option enables the use of hardware bit-reversal instructions on
 51	  architectures which support such operations.
 52
 53config ARCH_HAS_STRNCPY_FROM_USER
 54	bool
 55
 56config ARCH_HAS_STRNLEN_USER
 57	bool
 58
 59config GENERIC_STRNCPY_FROM_USER
 60	def_bool !ARCH_HAS_STRNCPY_FROM_USER
 61
 62config GENERIC_STRNLEN_USER
 63	def_bool !ARCH_HAS_STRNLEN_USER
 64
 65config GENERIC_NET_UTILS
 66	bool
 67
 68source "lib/math/Kconfig"
 69
 70config NO_GENERIC_PCI_IOPORT_MAP
 71	bool
 72
 73config GENERIC_PCI_IOMAP
 74	bool
 75
 76config GENERIC_IOMAP
 77	bool
 78	select GENERIC_PCI_IOMAP
 79
 80config STMP_DEVICE
 81	bool
 82
 83config ARCH_USE_CMPXCHG_LOCKREF
 84	bool
 85
 86config ARCH_HAS_FAST_MULTIPLIER
 87	bool
 88
 89config ARCH_USE_SYM_ANNOTATIONS
 90	bool
 91
 92config INDIRECT_PIO
 93	bool "Access I/O in non-MMIO mode"
 94	depends on ARM64
 95	help
 96	  On some platforms where no separate I/O space exists, there are I/O
 97	  hosts which can not be accessed in MMIO mode. Using the logical PIO
 98	  mechanism, the host-local I/O resource can be mapped into system
 99	  logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
100	  system can access the I/O devices with the mapped-logic PIO through
101	  I/O accessors.
102
103	  This way has relatively little I/O performance cost. Please make
104	  sure your devices really need this configure item enabled.
105
106	  When in doubt, say N.
107
108config INDIRECT_IOMEM
109	bool
110	help
111	  This is selected by other options/architectures to provide the
112	  emulated iomem accessors.
113
114config INDIRECT_IOMEM_FALLBACK
115	bool
116	depends on INDIRECT_IOMEM
117	help
118	  If INDIRECT_IOMEM is selected, this enables falling back to plain
119	  mmio accesses when the IO memory address is not a registered
120	  emulated region.
121
122config TRACE_MMIO_ACCESS
123	bool "Register read/write tracing"
124	depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS
125	help
126	  Create tracepoints for MMIO read/write operations. These trace events
127	  can be used for logging all MMIO read/write operations.
128
129source "lib/crypto/Kconfig"
130
131config CRC_CCITT
132	tristate "CRC-CCITT functions"
133	help
134	  This option is provided for the case where no in-kernel-tree
135	  modules require CRC-CCITT functions, but a module built outside
136	  the kernel tree does. Such modules that use library CRC-CCITT
137	  functions require M here.
138
139config CRC16
140	tristate "CRC16 functions"
141	help
142	  This option is provided for the case where no in-kernel-tree
143	  modules require CRC16 functions, but a module built outside
144	  the kernel tree does. Such modules that use library CRC16
145	  functions require M here.
146
147config CRC_T10DIF
148	tristate "CRC calculation for the T10 Data Integrity Field"
149	select CRYPTO
150	select CRYPTO_CRCT10DIF
151	help
152	  This option is only needed if a module that's not in the
153	  kernel tree needs to calculate CRC checks for use with the
154	  SCSI data integrity subsystem.
155
156config CRC64_ROCKSOFT
157	tristate "CRC calculation for the Rocksoft model CRC64"
158	select CRC64
159	select CRYPTO
160	select CRYPTO_CRC64_ROCKSOFT
161	help
162	  This option provides a CRC64 API to a registered crypto driver.
163	  This is used with the block layer's data integrity subsystem.
164
165config CRC_ITU_T
166	tristate "CRC ITU-T V.41 functions"
167	help
168	  This option is provided for the case where no in-kernel-tree
169	  modules require CRC ITU-T V.41 functions, but a module built outside
170	  the kernel tree does. Such modules that use library CRC ITU-T V.41
171	  functions require M here.
172
173config CRC32
174	tristate "CRC32/CRC32c functions"
175	default y
176	select BITREVERSE
177	help
178	  This option is provided for the case where no in-kernel-tree
179	  modules require CRC32/CRC32c functions, but a module built outside
180	  the kernel tree does. Such modules that use library CRC32/CRC32c
181	  functions require M here.
182
183config CRC32_SELFTEST
184	tristate "CRC32 perform self test on init"
185	depends on CRC32
186	help
187	  This option enables the CRC32 library functions to perform a
188	  self test on initialization. The self test computes crc32_le
189	  and crc32_be over byte strings with random alignment and length
190	  and computes the total elapsed time and number of bytes processed.
191
192choice
193	prompt "CRC32 implementation"
194	depends on CRC32
195	default CRC32_SLICEBY8
196	help
197	  This option allows a kernel builder to override the default choice
198	  of CRC32 algorithm.  Choose the default ("slice by 8") unless you
199	  know that you need one of the others.
200
201config CRC32_SLICEBY8
202	bool "Slice by 8 bytes"
203	help
204	  Calculate checksum 8 bytes at a time with a clever slicing algorithm.
205	  This is the fastest algorithm, but comes with a 8KiB lookup table.
206	  Most modern processors have enough cache to hold this table without
207	  thrashing the cache.
208
209	  This is the default implementation choice.  Choose this one unless
210	  you have a good reason not to.
211
212config CRC32_SLICEBY4
213	bool "Slice by 4 bytes"
214	help
215	  Calculate checksum 4 bytes at a time with a clever slicing algorithm.
216	  This is a bit slower than slice by 8, but has a smaller 4KiB lookup
217	  table.
218
219	  Only choose this option if you know what you are doing.
220
221config CRC32_SARWATE
222	bool "Sarwate's Algorithm (one byte at a time)"
223	help
224	  Calculate checksum a byte at a time using Sarwate's algorithm.  This
225	  is not particularly fast, but has a small 256 byte lookup table.
226
227	  Only choose this option if you know what you are doing.
228
229config CRC32_BIT
230	bool "Classic Algorithm (one bit at a time)"
231	help
232	  Calculate checksum one bit at a time.  This is VERY slow, but has
233	  no lookup table.  This is provided as a debugging option.
234
235	  Only choose this option if you are debugging crc32.
236
237endchoice
238
239config CRC64
240	tristate "CRC64 functions"
241	help
242	  This option is provided for the case where no in-kernel-tree
243	  modules require CRC64 functions, but a module built outside
244	  the kernel tree does. Such modules that use library CRC64
245	  functions require M here.
246
247config CRC4
248	tristate "CRC4 functions"
249	help
250	  This option is provided for the case where no in-kernel-tree
251	  modules require CRC4 functions, but a module built outside
252	  the kernel tree does. Such modules that use library CRC4
253	  functions require M here.
254
255config CRC7
256	tristate "CRC7 functions"
257	help
258	  This option is provided for the case where no in-kernel-tree
259	  modules require CRC7 functions, but a module built outside
260	  the kernel tree does. Such modules that use library CRC7
261	  functions require M here.
262
263config LIBCRC32C
264	tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
265	select CRYPTO
266	select CRYPTO_CRC32C
267	help
268	  This option is provided for the case where no in-kernel-tree
269	  modules require CRC32c functions, but a module built outside the
270	  kernel tree does. Such modules that use library CRC32c functions
271	  require M here.  See Castagnoli93.
272	  Module will be libcrc32c.
273
274config CRC8
275	tristate "CRC8 function"
276	help
277	  This option provides CRC8 function. Drivers may select this
278	  when they need to do cyclic redundancy check according CRC8
279	  algorithm. Module will be called crc8.
280
281config XXHASH
282	tristate
283
284config AUDIT_GENERIC
285	bool
286	depends on AUDIT && !AUDIT_ARCH
287	default y
288
289config AUDIT_ARCH_COMPAT_GENERIC
290	bool
291	default n
292
293config AUDIT_COMPAT_GENERIC
294	bool
295	depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
296	default y
297
298config RANDOM32_SELFTEST
299	bool "PRNG perform self test on init"
300	help
301	  This option enables the 32 bit PRNG library functions to perform a
302	  self test on initialization.
303
304#
305# compression support is select'ed if needed
306#
307config 842_COMPRESS
308	select CRC32
309	tristate
310
311config 842_DECOMPRESS
312	select CRC32
313	tristate
314
315config ZLIB_INFLATE
316	tristate
317
318config ZLIB_DEFLATE
319	tristate
320	select BITREVERSE
321
322config ZLIB_DFLTCC
323	def_bool y
324	depends on S390
325	prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
326	help
327	 Enable s390x hardware support for zlib in the kernel.
328
329config LZO_COMPRESS
330	tristate
331
332config LZO_DECOMPRESS
333	tristate
334
335config LZ4_COMPRESS
336	tristate
337
338config LZ4HC_COMPRESS
339	tristate
340
341config LZ4_DECOMPRESS
342	tristate
343
344config ZSTD_COMMON
345	select XXHASH
346	tristate
347
348config ZSTD_COMPRESS
349	select ZSTD_COMMON
350	tristate
351
352config ZSTD_DECOMPRESS
353	select ZSTD_COMMON
354	tristate
355
356source "lib/xz/Kconfig"
357
358#
359# These all provide a common interface (hence the apparent duplication with
360# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
361#
362config DECOMPRESS_GZIP
363	select ZLIB_INFLATE
364	tristate
365
366config DECOMPRESS_BZIP2
367	tristate
368
369config DECOMPRESS_LZMA
370	tristate
371
372config DECOMPRESS_XZ
373	select XZ_DEC
374	tristate
375
376config DECOMPRESS_LZO
377	select LZO_DECOMPRESS
378	tristate
379
380config DECOMPRESS_LZ4
381	select LZ4_DECOMPRESS
382	tristate
383
384config DECOMPRESS_ZSTD
385	select ZSTD_DECOMPRESS
386	tristate
387
388#
389# Generic allocator support is selected if needed
390#
391config GENERIC_ALLOCATOR
392	bool
393
394#
395# reed solomon support is select'ed if needed
396#
397config REED_SOLOMON
398	tristate
399	
400config REED_SOLOMON_ENC8
401	bool
402
403config REED_SOLOMON_DEC8
404	bool
405
406config REED_SOLOMON_ENC16
407	bool
408
409config REED_SOLOMON_DEC16
410	bool
411
412#
413# BCH support is selected if needed
414#
415config BCH
416	tristate
417
418config BCH_CONST_PARAMS
419	bool
420	help
421	  Drivers may select this option to force specific constant
422	  values for parameters 'm' (Galois field order) and 't'
423	  (error correction capability). Those specific values must
424	  be set by declaring default values for symbols BCH_CONST_M
425	  and BCH_CONST_T.
426	  Doing so will enable extra compiler optimizations,
427	  improving encoding and decoding performance up to 2x for
428	  usual (m,t) values (typically such that m*t < 200).
429	  When this option is selected, the BCH library supports
430	  only a single (m,t) configuration. This is mainly useful
431	  for NAND flash board drivers requiring known, fixed BCH
432	  parameters.
433
434config BCH_CONST_M
435	int
436	range 5 15
437	help
438	  Constant value for Galois field order 'm'. If 'k' is the
439	  number of data bits to protect, 'm' should be chosen such
440	  that (k + m*t) <= 2**m - 1.
441	  Drivers should declare a default value for this symbol if
442	  they select option BCH_CONST_PARAMS.
443
444config BCH_CONST_T
445	int
446	help
447	  Constant value for error correction capability in bits 't'.
448	  Drivers should declare a default value for this symbol if
449	  they select option BCH_CONST_PARAMS.
450
451#
452# Textsearch support is select'ed if needed
453#
454config TEXTSEARCH
455	bool
456
457config TEXTSEARCH_KMP
458	tristate
459
460config TEXTSEARCH_BM
461	tristate
462
463config TEXTSEARCH_FSM
464	tristate
465
466config BTREE
467	bool
468
469config INTERVAL_TREE
470	bool
471	help
472	  Simple, embeddable, interval-tree. Can find the start of an
473	  overlapping range in log(n) time and then iterate over all
474	  overlapping nodes. The algorithm is implemented as an
475	  augmented rbtree.
476
477	  See:
478
479		Documentation/core-api/rbtree.rst
480
481	  for more information.
482
483config INTERVAL_TREE_SPAN_ITER
484	bool
485	depends on INTERVAL_TREE
486
487config XARRAY_MULTI
488	bool
489	help
490	  Support entries which occupy multiple consecutive indices in the
491	  XArray.
492
493config ASSOCIATIVE_ARRAY
494	bool
495	help
496	  Generic associative array.  Can be searched and iterated over whilst
497	  it is being modified.  It is also reasonably quick to search and
498	  modify.  The algorithms are non-recursive, and the trees are highly
499	  capacious.
500
501	  See:
502
503		Documentation/core-api/assoc_array.rst
504
505	  for more information.
506
507config HAS_IOMEM
508	bool
509	depends on !NO_IOMEM
510	default y
511
512config HAS_IOPORT_MAP
513	bool
514	depends on HAS_IOMEM && !NO_IOPORT_MAP
515	default y
516
517source "kernel/dma/Kconfig"
518
519config SGL_ALLOC
520	bool
521	default n
522
523config IOMMU_HELPER
524	bool
525
526config CHECK_SIGNATURE
527	bool
528
529config CPUMASK_OFFSTACK
530	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
531	help
532	  Use dynamic allocation for cpumask_var_t, instead of putting
533	  them on the stack.  This is a bit more expensive, but avoids
534	  stack overflow.
535
536config FORCE_NR_CPUS
537       bool "Set number of CPUs at compile time"
538       depends on SMP && EXPERT && !COMPILE_TEST
539       help
540         Say Yes if you have NR_CPUS set to an actual number of possible
541         CPUs in your system, not to a default value. This forces the core
542         code to rely on compile-time value and optimize kernel routines
543         better.
544
545config CPU_RMAP
546	bool
547	depends on SMP
548
549config DQL
550	bool
551
552config GLOB
553	bool
554#	This actually supports modular compilation, but the module overhead
555#	is ridiculous for the amount of code involved.	Until an out-of-tree
556#	driver asks for it, we'll just link it directly it into the kernel
557#	when required.  Since we're ignoring out-of-tree users,	there's also
558#	no need bother prompting for a manual decision:
559#	prompt "glob_match() function"
560	help
561	  This option provides a glob_match function for performing
562	  simple text pattern matching.  It originated in the ATA code
563	  to blacklist particular drive models, but other device drivers
564	  may need similar functionality.
565
566	  All drivers in the Linux kernel tree that require this function
567	  should automatically select this option.  Say N unless you
568	  are compiling an out-of tree driver which tells you that it
569	  depends on this.
570
571config GLOB_SELFTEST
572	tristate "glob self-test on init"
573	depends on GLOB
574	help
575	  This option enables a simple self-test of the glob_match
576	  function on startup.	It is primarily useful for people
577	  working on the code to ensure they haven't introduced any
578	  regressions.
579
580	  It only adds a little bit of code and slows kernel boot (or
581	  module load) by a small amount, so you're welcome to play with
582	  it, but you probably don't need it.
583
584#
585# Netlink attribute parsing support is select'ed if needed
586#
587config NLATTR
588	bool
589
590#
591# Generic 64-bit atomic support is selected if needed
592#
593config GENERIC_ATOMIC64
594       bool
595
596config LRU_CACHE
597	tristate
598
599config CLZ_TAB
600	bool
601
602config IRQ_POLL
603	bool "IRQ polling library"
604	help
605	  Helper library to poll interrupt mitigation using polling.
606
607config MPILIB
608	tristate
609	select CLZ_TAB
610	help
611	  Multiprecision maths library from GnuPG.
612	  It is used to implement RSA digital signature verification,
613	  which is used by IMA/EVM digital signature extension.
614
615config SIGNATURE
616	tristate
617	depends on KEYS
618	select CRYPTO
619	select CRYPTO_SHA1
620	select MPILIB
621	help
622	  Digital signature verification. Currently only RSA is supported.
623	  Implementation is done using GnuPG MPI library
624
625config DIMLIB
626	bool
627	help
628	  Dynamic Interrupt Moderation library.
629	  Implements an algorithm for dynamically changing CQ moderation values
630	  according to run time performance.
631
632#
633# libfdt files, only selected if needed.
634#
635config LIBFDT
636	bool
637
638config OID_REGISTRY
639	tristate
640	help
641	  Enable fast lookup object identifier registry.
642
643config UCS2_STRING
644	tristate
645
646#
647# generic vdso
648#
649source "lib/vdso/Kconfig"
650
651source "lib/fonts/Kconfig"
652
653config SG_SPLIT
654	def_bool n
655	help
656	 Provides a helper to split scatterlists into chunks, each chunk being
657	 a scatterlist. This should be selected by a driver or an API which
658	 whishes to split a scatterlist amongst multiple DMA channels.
659
660config SG_POOL
661	def_bool n
662	help
663	 Provides a helper to allocate chained scatterlists. This should be
664	 selected by a driver or an API which whishes to allocate chained
665	 scatterlist.
666
667#
668# sg chaining option
669#
670
671config ARCH_NO_SG_CHAIN
672	def_bool n
673
674config ARCH_HAS_PMEM_API
675	bool
676
677config MEMREGION
678	bool
679
680config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
681	bool
682
683config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
684	bool
685
686# use memcpy to implement user copies for nommu architectures
687config UACCESS_MEMCPY
688	bool
689
690config ARCH_HAS_UACCESS_FLUSHCACHE
691	bool
692
693# arch has a concept of a recoverable synchronous exception due to a
694# memory-read error like x86 machine-check or ARM data-abort, and
695# implements copy_mc_to_{user,kernel} to abort and report
696# 'bytes-transferred' if that exception fires when accessing the source
697# buffer.
698config ARCH_HAS_COPY_MC
699	bool
700
701# Temporary. Goes away when all archs are cleaned up
702config ARCH_STACKWALK
703       bool
704
705config STACKDEPOT
706	bool
707	select STACKTRACE
708
709config STACKDEPOT_ALWAYS_INIT
710	bool
711	select STACKDEPOT
712
713config REF_TRACKER
714	bool
715	depends on STACKTRACE_SUPPORT
716	select STACKDEPOT
717
718config SBITMAP
719	bool
720
721config PARMAN
722	tristate "parman" if COMPILE_TEST
723
724config OBJAGG
725	tristate "objagg" if COMPILE_TEST
726
 
 
 
727endmenu
728
729config GENERIC_IOREMAP
730	bool
731
732config GENERIC_LIB_ASHLDI3
733	bool
734
735config GENERIC_LIB_ASHRDI3
736	bool
737
738config GENERIC_LIB_LSHRDI3
739	bool
740
741config GENERIC_LIB_MULDI3
742	bool
743
744config GENERIC_LIB_CMPDI2
745	bool
746
747config GENERIC_LIB_UCMPDI2
748	bool
749
750config GENERIC_LIB_DEVMEM_IS_ALLOWED
751	bool
752
753config PLDMFW
754	bool
755	default n
756
757config ASN1_ENCODER
758       tristate
759
760config POLYNOMIAL
761       tristate