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1#
2# Library configuration
3#
4
5config BINARY_PRINTF
6 def_bool n
7
8menu "Library routines"
9
10config RAID6_PQ
11 tristate
12
13config BITREVERSE
14 tristate
15
16config RATIONAL
17 boolean
18
19config GENERIC_STRNCPY_FROM_USER
20 bool
21
22config GENERIC_STRNLEN_USER
23 bool
24
25config GENERIC_NET_UTILS
26 bool
27
28config GENERIC_FIND_FIRST_BIT
29 bool
30
31config NO_GENERIC_PCI_IOPORT_MAP
32 bool
33
34config GENERIC_PCI_IOMAP
35 bool
36
37config GENERIC_IOMAP
38 bool
39 select GENERIC_PCI_IOMAP
40
41config GENERIC_IO
42 boolean
43 default n
44
45config STMP_DEVICE
46 bool
47
48config PERCPU_RWSEM
49 boolean
50
51config ARCH_USE_CMPXCHG_LOCKREF
52 bool
53
54config CRC_CCITT
55 tristate "CRC-CCITT functions"
56 help
57 This option is provided for the case where no in-kernel-tree
58 modules require CRC-CCITT functions, but a module built outside
59 the kernel tree does. Such modules that use library CRC-CCITT
60 functions require M here.
61
62config CRC16
63 tristate "CRC16 functions"
64 help
65 This option is provided for the case where no in-kernel-tree
66 modules require CRC16 functions, but a module built outside
67 the kernel tree does. Such modules that use library CRC16
68 functions require M here.
69
70config CRC_T10DIF
71 tristate "CRC calculation for the T10 Data Integrity Field"
72 select CRYPTO
73 select CRYPTO_CRCT10DIF
74 help
75 This option is only needed if a module that's not in the
76 kernel tree needs to calculate CRC checks for use with the
77 SCSI data integrity subsystem.
78
79config CRC_ITU_T
80 tristate "CRC ITU-T V.41 functions"
81 help
82 This option is provided for the case where no in-kernel-tree
83 modules require CRC ITU-T V.41 functions, but a module built outside
84 the kernel tree does. Such modules that use library CRC ITU-T V.41
85 functions require M here.
86
87config CRC32
88 tristate "CRC32/CRC32c functions"
89 default y
90 select BITREVERSE
91 help
92 This option is provided for the case where no in-kernel-tree
93 modules require CRC32/CRC32c functions, but a module built outside
94 the kernel tree does. Such modules that use library CRC32/CRC32c
95 functions require M here.
96
97config CRC32_SELFTEST
98 bool "CRC32 perform self test on init"
99 default n
100 depends on CRC32
101 help
102 This option enables the CRC32 library functions to perform a
103 self test on initialization. The self test computes crc32_le
104 and crc32_be over byte strings with random alignment and length
105 and computes the total elapsed time and number of bytes processed.
106
107choice
108 prompt "CRC32 implementation"
109 depends on CRC32
110 default CRC32_SLICEBY8
111 help
112 This option allows a kernel builder to override the default choice
113 of CRC32 algorithm. Choose the default ("slice by 8") unless you
114 know that you need one of the others.
115
116config CRC32_SLICEBY8
117 bool "Slice by 8 bytes"
118 help
119 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
120 This is the fastest algorithm, but comes with a 8KiB lookup table.
121 Most modern processors have enough cache to hold this table without
122 thrashing the cache.
123
124 This is the default implementation choice. Choose this one unless
125 you have a good reason not to.
126
127config CRC32_SLICEBY4
128 bool "Slice by 4 bytes"
129 help
130 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
131 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
132 table.
133
134 Only choose this option if you know what you are doing.
135
136config CRC32_SARWATE
137 bool "Sarwate's Algorithm (one byte at a time)"
138 help
139 Calculate checksum a byte at a time using Sarwate's algorithm. This
140 is not particularly fast, but has a small 256 byte lookup table.
141
142 Only choose this option if you know what you are doing.
143
144config CRC32_BIT
145 bool "Classic Algorithm (one bit at a time)"
146 help
147 Calculate checksum one bit at a time. This is VERY slow, but has
148 no lookup table. This is provided as a debugging option.
149
150 Only choose this option if you are debugging crc32.
151
152endchoice
153
154config CRC7
155 tristate "CRC7 functions"
156 help
157 This option is provided for the case where no in-kernel-tree
158 modules require CRC7 functions, but a module built outside
159 the kernel tree does. Such modules that use library CRC7
160 functions require M here.
161
162config LIBCRC32C
163 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
164 select CRYPTO
165 select CRYPTO_CRC32C
166 help
167 This option is provided for the case where no in-kernel-tree
168 modules require CRC32c functions, but a module built outside the
169 kernel tree does. Such modules that use library CRC32c functions
170 require M here. See Castagnoli93.
171 Module will be libcrc32c.
172
173config CRC8
174 tristate "CRC8 function"
175 help
176 This option provides CRC8 function. Drivers may select this
177 when they need to do cyclic redundancy check according CRC8
178 algorithm. Module will be called crc8.
179
180config AUDIT_GENERIC
181 bool
182 depends on AUDIT && !AUDIT_ARCH
183 default y
184
185config AUDIT_ARCH_COMPAT_GENERIC
186 bool
187 default n
188
189config AUDIT_COMPAT_GENERIC
190 bool
191 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
192 default y
193
194config RANDOM32_SELFTEST
195 bool "PRNG perform self test on init"
196 default n
197 help
198 This option enables the 32 bit PRNG library functions to perform a
199 self test on initialization.
200
201#
202# compression support is select'ed if needed
203#
204config ZLIB_INFLATE
205 tristate
206
207config ZLIB_DEFLATE
208 tristate
209
210config LZO_COMPRESS
211 tristate
212
213config LZO_DECOMPRESS
214 tristate
215
216config LZ4_COMPRESS
217 tristate
218
219config LZ4HC_COMPRESS
220 tristate
221
222config LZ4_DECOMPRESS
223 tristate
224
225source "lib/xz/Kconfig"
226
227#
228# These all provide a common interface (hence the apparent duplication with
229# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
230#
231config DECOMPRESS_GZIP
232 select ZLIB_INFLATE
233 tristate
234
235config DECOMPRESS_BZIP2
236 tristate
237
238config DECOMPRESS_LZMA
239 tristate
240
241config DECOMPRESS_XZ
242 select XZ_DEC
243 tristate
244
245config DECOMPRESS_LZO
246 select LZO_DECOMPRESS
247 tristate
248
249config DECOMPRESS_LZ4
250 select LZ4_DECOMPRESS
251 tristate
252
253#
254# Generic allocator support is selected if needed
255#
256config GENERIC_ALLOCATOR
257 boolean
258
259#
260# reed solomon support is select'ed if needed
261#
262config REED_SOLOMON
263 tristate
264
265config REED_SOLOMON_ENC8
266 boolean
267
268config REED_SOLOMON_DEC8
269 boolean
270
271config REED_SOLOMON_ENC16
272 boolean
273
274config REED_SOLOMON_DEC16
275 boolean
276
277#
278# BCH support is selected if needed
279#
280config BCH
281 tristate
282
283config BCH_CONST_PARAMS
284 boolean
285 help
286 Drivers may select this option to force specific constant
287 values for parameters 'm' (Galois field order) and 't'
288 (error correction capability). Those specific values must
289 be set by declaring default values for symbols BCH_CONST_M
290 and BCH_CONST_T.
291 Doing so will enable extra compiler optimizations,
292 improving encoding and decoding performance up to 2x for
293 usual (m,t) values (typically such that m*t < 200).
294 When this option is selected, the BCH library supports
295 only a single (m,t) configuration. This is mainly useful
296 for NAND flash board drivers requiring known, fixed BCH
297 parameters.
298
299config BCH_CONST_M
300 int
301 range 5 15
302 help
303 Constant value for Galois field order 'm'. If 'k' is the
304 number of data bits to protect, 'm' should be chosen such
305 that (k + m*t) <= 2**m - 1.
306 Drivers should declare a default value for this symbol if
307 they select option BCH_CONST_PARAMS.
308
309config BCH_CONST_T
310 int
311 help
312 Constant value for error correction capability in bits 't'.
313 Drivers should declare a default value for this symbol if
314 they select option BCH_CONST_PARAMS.
315
316#
317# Textsearch support is select'ed if needed
318#
319config TEXTSEARCH
320 boolean
321
322config TEXTSEARCH_KMP
323 tristate
324
325config TEXTSEARCH_BM
326 tristate
327
328config TEXTSEARCH_FSM
329 tristate
330
331config BTREE
332 boolean
333
334config ASSOCIATIVE_ARRAY
335 bool
336 help
337 Generic associative array. Can be searched and iterated over whilst
338 it is being modified. It is also reasonably quick to search and
339 modify. The algorithms are non-recursive, and the trees are highly
340 capacious.
341
342 See:
343
344 Documentation/assoc_array.txt
345
346 for more information.
347
348config HAS_IOMEM
349 boolean
350 depends on !NO_IOMEM
351 select GENERIC_IO
352 default y
353
354config HAS_IOPORT_MAP
355 boolean
356 depends on HAS_IOMEM && !NO_IOPORT_MAP
357 default y
358
359config HAS_DMA
360 boolean
361 depends on !NO_DMA
362 default y
363
364config CHECK_SIGNATURE
365 bool
366
367config CPUMASK_OFFSTACK
368 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
369 help
370 Use dynamic allocation for cpumask_var_t, instead of putting
371 them on the stack. This is a bit more expensive, but avoids
372 stack overflow.
373
374config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
375 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
376 depends on BROKEN
377
378config CPU_RMAP
379 bool
380 depends on SMP
381
382config DQL
383 bool
384
385#
386# Netlink attribute parsing support is select'ed if needed
387#
388config NLATTR
389 bool
390
391#
392# Generic 64-bit atomic support is selected if needed
393#
394config GENERIC_ATOMIC64
395 bool
396
397config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
398 def_bool y if GENERIC_ATOMIC64
399
400config LRU_CACHE
401 tristate
402
403config AVERAGE
404 bool "Averaging functions"
405 help
406 This option is provided for the case where no in-kernel-tree
407 modules require averaging functions, but a module built outside
408 the kernel tree does. Such modules that use library averaging
409 functions require Y here.
410
411 If unsure, say N.
412
413config CLZ_TAB
414 bool
415
416config CORDIC
417 tristate "CORDIC algorithm"
418 help
419 This option provides an implementation of the CORDIC algorithm;
420 calculations are in fixed point. Module will be called cordic.
421
422config DDR
423 bool "JEDEC DDR data"
424 help
425 Data from JEDEC specs for DDR SDRAM memories,
426 particularly the AC timing parameters and addressing
427 information. This data is useful for drivers handling
428 DDR SDRAM controllers.
429
430config MPILIB
431 tristate
432 select CLZ_TAB
433 help
434 Multiprecision maths library from GnuPG.
435 It is used to implement RSA digital signature verification,
436 which is used by IMA/EVM digital signature extension.
437
438config SIGNATURE
439 tristate
440 depends on KEYS && CRYPTO
441 select CRYPTO_SHA1
442 select MPILIB
443 help
444 Digital signature verification. Currently only RSA is supported.
445 Implementation is done using GnuPG MPI library
446
447#
448# libfdt files, only selected if needed.
449#
450config LIBFDT
451 bool
452
453config OID_REGISTRY
454 tristate
455 help
456 Enable fast lookup object identifier registry.
457
458config UCS2_STRING
459 tristate
460
461source "lib/fonts/Kconfig"
462
463endmenu
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 INDIRECT_IOMEM
106 bool
107 help
108 This is selected by other options/architectures to provide the
109 emulated iomem accessors.
110
111config INDIRECT_IOMEM_FALLBACK
112 bool
113 depends on INDIRECT_IOMEM
114 help
115 If INDIRECT_IOMEM is selected, this enables falling back to plain
116 mmio accesses when the IO memory address is not a registered
117 emulated region.
118
119config CRC_CCITT
120 tristate "CRC-CCITT functions"
121 help
122 This option is provided for the case where no in-kernel-tree
123 modules require CRC-CCITT functions, but a module built outside
124 the kernel tree does. Such modules that use library CRC-CCITT
125 functions require M here.
126
127config CRC16
128 tristate "CRC16 functions"
129 help
130 This option is provided for the case where no in-kernel-tree
131 modules require CRC16 functions, but a module built outside
132 the kernel tree does. Such modules that use library CRC16
133 functions require M here.
134
135config CRC_T10DIF
136 tristate "CRC calculation for the T10 Data Integrity Field"
137 select CRYPTO
138 select CRYPTO_CRCT10DIF
139 help
140 This option is only needed if a module that's not in the
141 kernel tree needs to calculate CRC checks for use with the
142 SCSI data integrity subsystem.
143
144config CRC_ITU_T
145 tristate "CRC ITU-T V.41 functions"
146 help
147 This option is provided for the case where no in-kernel-tree
148 modules require CRC ITU-T V.41 functions, but a module built outside
149 the kernel tree does. Such modules that use library CRC ITU-T V.41
150 functions require M here.
151
152config CRC32
153 tristate "CRC32/CRC32c functions"
154 default y
155 select BITREVERSE
156 help
157 This option is provided for the case where no in-kernel-tree
158 modules require CRC32/CRC32c functions, but a module built outside
159 the kernel tree does. Such modules that use library CRC32/CRC32c
160 functions require M here.
161
162config CRC32_SELFTEST
163 tristate "CRC32 perform self test on init"
164 depends on CRC32
165 help
166 This option enables the CRC32 library functions to perform a
167 self test on initialization. The self test computes crc32_le
168 and crc32_be over byte strings with random alignment and length
169 and computes the total elapsed time and number of bytes processed.
170
171choice
172 prompt "CRC32 implementation"
173 depends on CRC32
174 default CRC32_SLICEBY8
175 help
176 This option allows a kernel builder to override the default choice
177 of CRC32 algorithm. Choose the default ("slice by 8") unless you
178 know that you need one of the others.
179
180config CRC32_SLICEBY8
181 bool "Slice by 8 bytes"
182 help
183 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
184 This is the fastest algorithm, but comes with a 8KiB lookup table.
185 Most modern processors have enough cache to hold this table without
186 thrashing the cache.
187
188 This is the default implementation choice. Choose this one unless
189 you have a good reason not to.
190
191config CRC32_SLICEBY4
192 bool "Slice by 4 bytes"
193 help
194 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
195 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
196 table.
197
198 Only choose this option if you know what you are doing.
199
200config CRC32_SARWATE
201 bool "Sarwate's Algorithm (one byte at a time)"
202 help
203 Calculate checksum a byte at a time using Sarwate's algorithm. This
204 is not particularly fast, but has a small 256 byte lookup table.
205
206 Only choose this option if you know what you are doing.
207
208config CRC32_BIT
209 bool "Classic Algorithm (one bit at a time)"
210 help
211 Calculate checksum one bit at a time. This is VERY slow, but has
212 no lookup table. This is provided as a debugging option.
213
214 Only choose this option if you are debugging crc32.
215
216endchoice
217
218config CRC64
219 tristate "CRC64 functions"
220 help
221 This option is provided for the case where no in-kernel-tree
222 modules require CRC64 functions, but a module built outside
223 the kernel tree does. Such modules that use library CRC64
224 functions require M here.
225
226config CRC4
227 tristate "CRC4 functions"
228 help
229 This option is provided for the case where no in-kernel-tree
230 modules require CRC4 functions, but a module built outside
231 the kernel tree does. Such modules that use library CRC4
232 functions require M here.
233
234config CRC7
235 tristate "CRC7 functions"
236 help
237 This option is provided for the case where no in-kernel-tree
238 modules require CRC7 functions, but a module built outside
239 the kernel tree does. Such modules that use library CRC7
240 functions require M here.
241
242config LIBCRC32C
243 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
244 select CRYPTO
245 select CRYPTO_CRC32C
246 help
247 This option is provided for the case where no in-kernel-tree
248 modules require CRC32c functions, but a module built outside the
249 kernel tree does. Such modules that use library CRC32c functions
250 require M here. See Castagnoli93.
251 Module will be libcrc32c.
252
253config CRC8
254 tristate "CRC8 function"
255 help
256 This option provides CRC8 function. Drivers may select this
257 when they need to do cyclic redundancy check according CRC8
258 algorithm. Module will be called crc8.
259
260config XXHASH
261 tristate
262
263config AUDIT_GENERIC
264 bool
265 depends on AUDIT && !AUDIT_ARCH
266 default y
267
268config AUDIT_ARCH_COMPAT_GENERIC
269 bool
270 default n
271
272config AUDIT_COMPAT_GENERIC
273 bool
274 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
275 default y
276
277config RANDOM32_SELFTEST
278 bool "PRNG perform self test on init"
279 help
280 This option enables the 32 bit PRNG library functions to perform a
281 self test on initialization.
282
283#
284# compression support is select'ed if needed
285#
286config 842_COMPRESS
287 select CRC32
288 tristate
289
290config 842_DECOMPRESS
291 select CRC32
292 tristate
293
294config ZLIB_INFLATE
295 tristate
296
297config ZLIB_DEFLATE
298 tristate
299 select BITREVERSE
300
301config ZLIB_DFLTCC
302 def_bool y
303 depends on S390
304 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
305 help
306 Enable s390x hardware support for zlib in the kernel.
307
308config LZO_COMPRESS
309 tristate
310
311config LZO_DECOMPRESS
312 tristate
313
314config LZ4_COMPRESS
315 tristate
316
317config LZ4HC_COMPRESS
318 tristate
319
320config LZ4_DECOMPRESS
321 tristate
322
323config ZSTD_COMPRESS
324 select XXHASH
325 tristate
326
327config ZSTD_DECOMPRESS
328 select XXHASH
329 tristate
330
331source "lib/xz/Kconfig"
332
333#
334# These all provide a common interface (hence the apparent duplication with
335# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
336#
337config DECOMPRESS_GZIP
338 select ZLIB_INFLATE
339 tristate
340
341config DECOMPRESS_BZIP2
342 tristate
343
344config DECOMPRESS_LZMA
345 tristate
346
347config DECOMPRESS_XZ
348 select XZ_DEC
349 tristate
350
351config DECOMPRESS_LZO
352 select LZO_DECOMPRESS
353 tristate
354
355config DECOMPRESS_LZ4
356 select LZ4_DECOMPRESS
357 tristate
358
359config DECOMPRESS_ZSTD
360 select ZSTD_DECOMPRESS
361 tristate
362
363#
364# Generic allocator support is selected if needed
365#
366config GENERIC_ALLOCATOR
367 bool
368
369#
370# reed solomon support is select'ed if needed
371#
372config REED_SOLOMON
373 tristate
374
375config REED_SOLOMON_ENC8
376 bool
377
378config REED_SOLOMON_DEC8
379 bool
380
381config REED_SOLOMON_ENC16
382 bool
383
384config REED_SOLOMON_DEC16
385 bool
386
387#
388# BCH support is selected if needed
389#
390config BCH
391 tristate
392
393config BCH_CONST_PARAMS
394 bool
395 help
396 Drivers may select this option to force specific constant
397 values for parameters 'm' (Galois field order) and 't'
398 (error correction capability). Those specific values must
399 be set by declaring default values for symbols BCH_CONST_M
400 and BCH_CONST_T.
401 Doing so will enable extra compiler optimizations,
402 improving encoding and decoding performance up to 2x for
403 usual (m,t) values (typically such that m*t < 200).
404 When this option is selected, the BCH library supports
405 only a single (m,t) configuration. This is mainly useful
406 for NAND flash board drivers requiring known, fixed BCH
407 parameters.
408
409config BCH_CONST_M
410 int
411 range 5 15
412 help
413 Constant value for Galois field order 'm'. If 'k' is the
414 number of data bits to protect, 'm' should be chosen such
415 that (k + m*t) <= 2**m - 1.
416 Drivers should declare a default value for this symbol if
417 they select option BCH_CONST_PARAMS.
418
419config BCH_CONST_T
420 int
421 help
422 Constant value for error correction capability in bits 't'.
423 Drivers should declare a default value for this symbol if
424 they select option BCH_CONST_PARAMS.
425
426#
427# Textsearch support is select'ed if needed
428#
429config TEXTSEARCH
430 bool
431
432config TEXTSEARCH_KMP
433 tristate
434
435config TEXTSEARCH_BM
436 tristate
437
438config TEXTSEARCH_FSM
439 tristate
440
441config BTREE
442 bool
443
444config INTERVAL_TREE
445 bool
446 help
447 Simple, embeddable, interval-tree. Can find the start of an
448 overlapping range in log(n) time and then iterate over all
449 overlapping nodes. The algorithm is implemented as an
450 augmented rbtree.
451
452 See:
453
454 Documentation/core-api/rbtree.rst
455
456 for more information.
457
458config XARRAY_MULTI
459 bool
460 help
461 Support entries which occupy multiple consecutive indices in the
462 XArray.
463
464config ASSOCIATIVE_ARRAY
465 bool
466 help
467 Generic associative array. Can be searched and iterated over whilst
468 it is being modified. It is also reasonably quick to search and
469 modify. The algorithms are non-recursive, and the trees are highly
470 capacious.
471
472 See:
473
474 Documentation/core-api/assoc_array.rst
475
476 for more information.
477
478config HAS_IOMEM
479 bool
480 depends on !NO_IOMEM
481 default y
482
483config HAS_IOPORT_MAP
484 bool
485 depends on HAS_IOMEM && !NO_IOPORT_MAP
486 default y
487
488source "kernel/dma/Kconfig"
489
490config SGL_ALLOC
491 bool
492 default n
493
494config IOMMU_HELPER
495 bool
496
497config CHECK_SIGNATURE
498 bool
499
500config CPUMASK_OFFSTACK
501 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
502 help
503 Use dynamic allocation for cpumask_var_t, instead of putting
504 them on the stack. This is a bit more expensive, but avoids
505 stack overflow.
506
507config CPU_RMAP
508 bool
509 depends on SMP
510
511config DQL
512 bool
513
514config GLOB
515 bool
516# This actually supports modular compilation, but the module overhead
517# is ridiculous for the amount of code involved. Until an out-of-tree
518# driver asks for it, we'll just link it directly it into the kernel
519# when required. Since we're ignoring out-of-tree users, there's also
520# no need bother prompting for a manual decision:
521# prompt "glob_match() function"
522 help
523 This option provides a glob_match function for performing
524 simple text pattern matching. It originated in the ATA code
525 to blacklist particular drive models, but other device drivers
526 may need similar functionality.
527
528 All drivers in the Linux kernel tree that require this function
529 should automatically select this option. Say N unless you
530 are compiling an out-of tree driver which tells you that it
531 depends on this.
532
533config GLOB_SELFTEST
534 tristate "glob self-test on init"
535 depends on GLOB
536 help
537 This option enables a simple self-test of the glob_match
538 function on startup. It is primarily useful for people
539 working on the code to ensure they haven't introduced any
540 regressions.
541
542 It only adds a little bit of code and slows kernel boot (or
543 module load) by a small amount, so you're welcome to play with
544 it, but you probably don't need it.
545
546#
547# Netlink attribute parsing support is select'ed if needed
548#
549config NLATTR
550 bool
551
552#
553# Generic 64-bit atomic support is selected if needed
554#
555config GENERIC_ATOMIC64
556 bool
557
558config LRU_CACHE
559 tristate
560
561config CLZ_TAB
562 bool
563
564config IRQ_POLL
565 bool "IRQ polling library"
566 help
567 Helper library to poll interrupt mitigation using polling.
568
569config MPILIB
570 tristate
571 select CLZ_TAB
572 help
573 Multiprecision maths library from GnuPG.
574 It is used to implement RSA digital signature verification,
575 which is used by IMA/EVM digital signature extension.
576
577config SIGNATURE
578 tristate
579 depends on KEYS
580 select CRYPTO
581 select CRYPTO_SHA1
582 select MPILIB
583 help
584 Digital signature verification. Currently only RSA is supported.
585 Implementation is done using GnuPG MPI library
586
587config DIMLIB
588 bool
589 help
590 Dynamic Interrupt Moderation library.
591 Implements an algorithm for dynamically changing CQ moderation values
592 according to run time performance.
593
594#
595# libfdt files, only selected if needed.
596#
597config LIBFDT
598 bool
599
600config OID_REGISTRY
601 tristate
602 help
603 Enable fast lookup object identifier registry.
604
605config UCS2_STRING
606 tristate
607
608#
609# generic vdso
610#
611source "lib/vdso/Kconfig"
612
613source "lib/fonts/Kconfig"
614
615config SG_SPLIT
616 def_bool n
617 help
618 Provides a helper to split scatterlists into chunks, each chunk being
619 a scatterlist. This should be selected by a driver or an API which
620 whishes to split a scatterlist amongst multiple DMA channels.
621
622config SG_POOL
623 def_bool n
624 help
625 Provides a helper to allocate chained scatterlists. This should be
626 selected by a driver or an API which whishes to allocate chained
627 scatterlist.
628
629#
630# sg chaining option
631#
632
633config ARCH_NO_SG_CHAIN
634 def_bool n
635
636config ARCH_HAS_PMEM_API
637 bool
638
639config MEMREGION
640 bool
641
642config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
643 bool
644
645# use memcpy to implement user copies for nommu architectures
646config UACCESS_MEMCPY
647 bool
648
649config ARCH_HAS_UACCESS_FLUSHCACHE
650 bool
651
652# arch has a concept of a recoverable synchronous exception due to a
653# memory-read error like x86 machine-check or ARM data-abort, and
654# implements copy_mc_to_{user,kernel} to abort and report
655# 'bytes-transferred' if that exception fires when accessing the source
656# buffer.
657config ARCH_HAS_COPY_MC
658 bool
659
660# Temporary. Goes away when all archs are cleaned up
661config ARCH_STACKWALK
662 bool
663
664config STACKDEPOT
665 bool
666 select STACKTRACE
667
668config STACK_HASH_ORDER
669 int "stack depot hash size (12 => 4KB, 20 => 1024KB)"
670 range 12 20
671 default 20
672 depends on STACKDEPOT
673 help
674 Select the hash size as a power of 2 for the stackdepot hash table.
675 Choose a lower value to reduce the memory impact.
676
677config SBITMAP
678 bool
679
680config PARMAN
681 tristate "parman" if COMPILE_TEST
682
683config OBJAGG
684 tristate "objagg" if COMPILE_TEST
685
686endmenu
687
688config GENERIC_IOREMAP
689 bool
690
691config GENERIC_LIB_ASHLDI3
692 bool
693
694config GENERIC_LIB_ASHRDI3
695 bool
696
697config GENERIC_LIB_LSHRDI3
698 bool
699
700config GENERIC_LIB_MULDI3
701 bool
702
703config GENERIC_LIB_CMPDI2
704 bool
705
706config GENERIC_LIB_UCMPDI2
707 bool
708
709config GENERIC_LIB_DEVMEM_IS_ALLOWED
710 bool
711
712config PLDMFW
713 bool
714 default n
715
716config ASN1_ENCODER
717 tristate