xref: /linux/lib/Kconfig (revision 80b0ca98f91ddbc09828aff5a00af1c73837713e)
1ec8f24b7SThomas Gleixner# SPDX-License-Identifier: GPL-2.0-only
21da177e4SLinus Torvalds#
31da177e4SLinus Torvalds# Library configuration
41da177e4SLinus Torvalds#
51da177e4SLinus Torvalds
64370aa4aSLai Jiangshanconfig BINARY_PRINTF
74370aa4aSLai Jiangshan	def_bool n
84370aa4aSLai Jiangshan
91da177e4SLinus Torvaldsmenu "Library routines"
101da177e4SLinus Torvalds
11f5e70d0fSDavid Woodhouseconfig RAID6_PQ
12f5e70d0fSDavid Woodhouse	tristate
13f5e70d0fSDavid Woodhouse
14be85f93aSDaniel Verkampconfig RAID6_PQ_BENCHMARK
15be85f93aSDaniel Verkamp	bool "Automatically choose fastest RAID6 PQ functions"
16be85f93aSDaniel Verkamp	depends on RAID6_PQ
17be85f93aSDaniel Verkamp	default y
18be85f93aSDaniel Verkamp	help
19be85f93aSDaniel Verkamp	  Benchmark all available RAID6 PQ functions on init and choose the
20be85f93aSDaniel Verkamp	  fastest one.
21be85f93aSDaniel Verkamp
22554aae35SVladimir Olteanconfig PACKING
23554aae35SVladimir Oltean	bool "Generic bitfield packing and unpacking"
24554aae35SVladimir Oltean	default n
25554aae35SVladimir Oltean	help
26554aae35SVladimir Oltean	  This option provides the packing() helper function, which permits
27554aae35SVladimir Oltean	  converting bitfields between a CPU-usable representation and a
28554aae35SVladimir Oltean	  memory representation that can have any combination of these quirks:
29554aae35SVladimir Oltean	    - Is little endian (bytes are reversed within a 32-bit group)
30554aae35SVladimir Oltean	    - The least-significant 32-bit word comes first (within a 64-bit
31554aae35SVladimir Oltean	      group)
32554aae35SVladimir Oltean	    - The most significant bit of a byte is at its right (bit 0 of a
33554aae35SVladimir Oltean	      register description is numerically 2^7).
34554aae35SVladimir Oltean	  Drivers may use these helpers to match the bit indices as described
35554aae35SVladimir Oltean	  in the data sheets of the peripherals they are in control of.
36554aae35SVladimir Oltean
37554aae35SVladimir Oltean	  When in doubt, say N.
38554aae35SVladimir Oltean
39a5cfc1ecSAkinobu Mitaconfig BITREVERSE
40a5cfc1ecSAkinobu Mita	tristate
41a5cfc1ecSAkinobu Mita
42556d2f05SYalin Wangconfig HAVE_ARCH_BITREVERSE
43841c0090SChristoph Jaeger	bool
44556d2f05SYalin Wang	default n
45556d2f05SYalin Wang	depends on BITREVERSE
46556d2f05SYalin Wang	help
479e522c0dSAndrew Morton	  This option enables the use of hardware bit-reversal instructions on
489e522c0dSAndrew Morton	  architectures which support such operations.
49556d2f05SYalin Wang
502922585bSDavid S. Millerconfig GENERIC_STRNCPY_FROM_USER
512922585bSDavid S. Miller	bool
522922585bSDavid S. Miller
53a08c5356SLinus Torvaldsconfig GENERIC_STRNLEN_USER
54a08c5356SLinus Torvalds	bool
55a08c5356SLinus Torvalds
564cd5773aSAndy Shevchenkoconfig GENERIC_NET_UTILS
574cd5773aSAndy Shevchenko	bool
584cd5773aSAndy Shevchenko
5919870defSAlexander van Heukelumconfig GENERIC_FIND_FIRST_BIT
609ba16087SJan Beulich	bool
6119870defSAlexander van Heukelum
622c64e9cbSAndy Shevchenkosource "lib/math/Kconfig"
632c64e9cbSAndy Shevchenko
64b923650bSMichael S. Tsirkinconfig NO_GENERIC_PCI_IOPORT_MAP
65b923650bSMichael S. Tsirkin	bool
66b923650bSMichael S. Tsirkin
6766eab4dfSMichael S. Tsirkinconfig GENERIC_PCI_IOMAP
6866eab4dfSMichael S. Tsirkin	bool
6966eab4dfSMichael S. Tsirkin
704673ca8eSMichael S. Tsirkinconfig GENERIC_IOMAP
714673ca8eSMichael S. Tsirkin	bool
7266eab4dfSMichael S. Tsirkin	select GENERIC_PCI_IOMAP
734673ca8eSMichael S. Tsirkin
744ccf4beaSWolfram Sangconfig STMP_DEVICE
754ccf4beaSWolfram Sang	bool
764ccf4beaSWolfram Sang
77bc08b449SLinus Torvaldsconfig ARCH_USE_CMPXCHG_LOCKREF
78bc08b449SLinus Torvalds	bool
79bc08b449SLinus Torvalds
8072d93104SLinus Torvaldsconfig ARCH_HAS_FAST_MULTIPLIER
8172d93104SLinus Torvalds	bool
8272d93104SLinus Torvalds
83031e3601SZhichang Yuanconfig INDIRECT_PIO
84031e3601SZhichang Yuan	bool "Access I/O in non-MMIO mode"
85031e3601SZhichang Yuan	depends on ARM64
86031e3601SZhichang Yuan	help
87031e3601SZhichang Yuan	  On some platforms where no separate I/O space exists, there are I/O
88031e3601SZhichang Yuan	  hosts which can not be accessed in MMIO mode. Using the logical PIO
89031e3601SZhichang Yuan	  mechanism, the host-local I/O resource can be mapped into system
90031e3601SZhichang Yuan	  logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
91031e3601SZhichang Yuan	  system can access the I/O devices with the mapped-logic PIO through
92031e3601SZhichang Yuan	  I/O accessors.
93031e3601SZhichang Yuan
94031e3601SZhichang Yuan	  This way has relatively little I/O performance cost. Please make
95031e3601SZhichang Yuan	  sure your devices really need this configure item enabled.
96031e3601SZhichang Yuan
97031e3601SZhichang Yuan	  When in doubt, say N.
98031e3601SZhichang Yuan
991da177e4SLinus Torvaldsconfig CRC_CCITT
1001da177e4SLinus Torvalds	tristate "CRC-CCITT functions"
1011da177e4SLinus Torvalds	help
1021da177e4SLinus Torvalds	  This option is provided for the case where no in-kernel-tree
1031da177e4SLinus Torvalds	  modules require CRC-CCITT functions, but a module built outside
1041da177e4SLinus Torvalds	  the kernel tree does. Such modules that use library CRC-CCITT
1051da177e4SLinus Torvalds	  functions require M here.
1061da177e4SLinus Torvalds
1077657ec1fSEvgeniy Polyakovconfig CRC16
1087657ec1fSEvgeniy Polyakov	tristate "CRC16 functions"
1097657ec1fSEvgeniy Polyakov	help
1107657ec1fSEvgeniy Polyakov	  This option is provided for the case where no in-kernel-tree
1117657ec1fSEvgeniy Polyakov	  modules require CRC16 functions, but a module built outside
1127657ec1fSEvgeniy Polyakov	  the kernel tree does. Such modules that use library CRC16
1137657ec1fSEvgeniy Polyakov	  functions require M here.
1147657ec1fSEvgeniy Polyakov
115f11f594eSMartin K. Petersenconfig CRC_T10DIF
116f11f594eSMartin K. Petersen	tristate "CRC calculation for the T10 Data Integrity Field"
11768411521SHerbert Xu	select CRYPTO
11868411521SHerbert Xu	select CRYPTO_CRCT10DIF
119f11f594eSMartin K. Petersen	help
120f11f594eSMartin K. Petersen	  This option is only needed if a module that's not in the
121f11f594eSMartin K. Petersen	  kernel tree needs to calculate CRC checks for use with the
122f11f594eSMartin K. Petersen	  SCSI data integrity subsystem.
123f11f594eSMartin K. Petersen
1243e7cbae7SIvo van Doornconfig CRC_ITU_T
1253e7cbae7SIvo van Doorn	tristate "CRC ITU-T V.41 functions"
1263e7cbae7SIvo van Doorn	help
1273e7cbae7SIvo van Doorn	  This option is provided for the case where no in-kernel-tree
1283e7cbae7SIvo van Doorn	  modules require CRC ITU-T V.41 functions, but a module built outside
1293e7cbae7SIvo van Doorn	  the kernel tree does. Such modules that use library CRC ITU-T V.41
1303e7cbae7SIvo van Doorn	  functions require M here.
1313e7cbae7SIvo van Doorn
1321da177e4SLinus Torvaldsconfig CRC32
13346c5801eSDarrick J. Wong	tristate "CRC32/CRC32c functions"
1341da177e4SLinus Torvalds	default y
135906d66dfSAkinobu Mita	select BITREVERSE
1361da177e4SLinus Torvalds	help
1371da177e4SLinus Torvalds	  This option is provided for the case where no in-kernel-tree
13846c5801eSDarrick J. Wong	  modules require CRC32/CRC32c functions, but a module built outside
13946c5801eSDarrick J. Wong	  the kernel tree does. Such modules that use library CRC32/CRC32c
14046c5801eSDarrick J. Wong	  functions require M here.
1411da177e4SLinus Torvalds
1423863ef31SBob Pearsonconfig CRC32_SELFTEST
1435fb7f874SGeert Uytterhoeven	tristate "CRC32 perform self test on init"
1443863ef31SBob Pearson	depends on CRC32
1453863ef31SBob Pearson	help
1463863ef31SBob Pearson	  This option enables the CRC32 library functions to perform a
1473863ef31SBob Pearson	  self test on initialization. The self test computes crc32_le
1483863ef31SBob Pearson	  and crc32_be over byte strings with random alignment and length
1493863ef31SBob Pearson	  and computes the total elapsed time and number of bytes processed.
1503863ef31SBob Pearson
1515cde7656SDarrick J. Wongchoice
1525cde7656SDarrick J. Wong	prompt "CRC32 implementation"
1535cde7656SDarrick J. Wong	depends on CRC32
1545cde7656SDarrick J. Wong	default CRC32_SLICEBY8
15582edb4baSDarrick J. Wong	help
15682edb4baSDarrick J. Wong	  This option allows a kernel builder to override the default choice
15782edb4baSDarrick J. Wong	  of CRC32 algorithm.  Choose the default ("slice by 8") unless you
15882edb4baSDarrick J. Wong	  know that you need one of the others.
1595cde7656SDarrick J. Wong
1605cde7656SDarrick J. Wongconfig CRC32_SLICEBY8
1615cde7656SDarrick J. Wong	bool "Slice by 8 bytes"
1625cde7656SDarrick J. Wong	help
1635cde7656SDarrick J. Wong	  Calculate checksum 8 bytes at a time with a clever slicing algorithm.
1645cde7656SDarrick J. Wong	  This is the fastest algorithm, but comes with a 8KiB lookup table.
1655cde7656SDarrick J. Wong	  Most modern processors have enough cache to hold this table without
1665cde7656SDarrick J. Wong	  thrashing the cache.
1675cde7656SDarrick J. Wong
1685cde7656SDarrick J. Wong	  This is the default implementation choice.  Choose this one unless
1695cde7656SDarrick J. Wong	  you have a good reason not to.
1705cde7656SDarrick J. Wong
1715cde7656SDarrick J. Wongconfig CRC32_SLICEBY4
1725cde7656SDarrick J. Wong	bool "Slice by 4 bytes"
1735cde7656SDarrick J. Wong	help
1745cde7656SDarrick J. Wong	  Calculate checksum 4 bytes at a time with a clever slicing algorithm.
1755cde7656SDarrick J. Wong	  This is a bit slower than slice by 8, but has a smaller 4KiB lookup
1765cde7656SDarrick J. Wong	  table.
1775cde7656SDarrick J. Wong
1785cde7656SDarrick J. Wong	  Only choose this option if you know what you are doing.
1795cde7656SDarrick J. Wong
1805cde7656SDarrick J. Wongconfig CRC32_SARWATE
1815cde7656SDarrick J. Wong	bool "Sarwate's Algorithm (one byte at a time)"
1825cde7656SDarrick J. Wong	help
1835cde7656SDarrick J. Wong	  Calculate checksum a byte at a time using Sarwate's algorithm.  This
1845cde7656SDarrick J. Wong	  is not particularly fast, but has a small 256 byte lookup table.
1855cde7656SDarrick J. Wong
1865cde7656SDarrick J. Wong	  Only choose this option if you know what you are doing.
1875cde7656SDarrick J. Wong
1885cde7656SDarrick J. Wongconfig CRC32_BIT
1895cde7656SDarrick J. Wong	bool "Classic Algorithm (one bit at a time)"
1905cde7656SDarrick J. Wong	help
1915cde7656SDarrick J. Wong	  Calculate checksum one bit at a time.  This is VERY slow, but has
1925cde7656SDarrick J. Wong	  no lookup table.  This is provided as a debugging option.
1935cde7656SDarrick J. Wong
1945cde7656SDarrick J. Wong	  Only choose this option if you are debugging crc32.
1955cde7656SDarrick J. Wong
1965cde7656SDarrick J. Wongendchoice
1975cde7656SDarrick J. Wong
198feba04fdSColy Liconfig CRC64
199feba04fdSColy Li	tristate "CRC64 functions"
200feba04fdSColy Li	help
201feba04fdSColy Li	  This option is provided for the case where no in-kernel-tree
202feba04fdSColy Li	  modules require CRC64 functions, but a module built outside
203feba04fdSColy Li	  the kernel tree does. Such modules that use library CRC64
204feba04fdSColy Li	  functions require M here.
205feba04fdSColy Li
2060cbaa448SJeremy Kerrconfig CRC4
2070cbaa448SJeremy Kerr	tristate "CRC4 functions"
2080cbaa448SJeremy Kerr	help
2090cbaa448SJeremy Kerr	  This option is provided for the case where no in-kernel-tree
2100cbaa448SJeremy Kerr	  modules require CRC4 functions, but a module built outside
2110cbaa448SJeremy Kerr	  the kernel tree does. Such modules that use library CRC4
2120cbaa448SJeremy Kerr	  functions require M here.
2130cbaa448SJeremy Kerr
214ad241528SJan Nikitenkoconfig CRC7
215ad241528SJan Nikitenko	tristate "CRC7 functions"
216ad241528SJan Nikitenko	help
217ad241528SJan Nikitenko	  This option is provided for the case where no in-kernel-tree
218ad241528SJan Nikitenko	  modules require CRC7 functions, but a module built outside
219ad241528SJan Nikitenko	  the kernel tree does. Such modules that use library CRC7
220ad241528SJan Nikitenko	  functions require M here.
221ad241528SJan Nikitenko
2221da177e4SLinus Torvaldsconfig LIBCRC32C
2231da177e4SLinus Torvalds	tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
22493027354SHerbert Xu	select CRYPTO
22569c35efcSHerbert Xu	select CRYPTO_CRC32C
2261da177e4SLinus Torvalds	help
2271da177e4SLinus Torvalds	  This option is provided for the case where no in-kernel-tree
2281da177e4SLinus Torvalds	  modules require CRC32c functions, but a module built outside the
2291da177e4SLinus Torvalds	  kernel tree does. Such modules that use library CRC32c functions
2301da177e4SLinus Torvalds	  require M here.  See Castagnoli93.
2311da177e4SLinus Torvalds	  Module will be libcrc32c.
2321da177e4SLinus Torvalds
2337150962dSArend van Sprielconfig CRC8
2347150962dSArend van Spriel	tristate "CRC8 function"
2357150962dSArend van Spriel	help
2367150962dSArend van Spriel	  This option provides CRC8 function. Drivers may select this
2377150962dSArend van Spriel	  when they need to do cyclic redundancy check according CRC8
2387150962dSArend van Spriel	  algorithm. Module will be called crc8.
2397150962dSArend van Spriel
2405d240522SNick Terrellconfig XXHASH
2415d240522SNick Terrell	tristate
2425d240522SNick Terrell
243e65e1fc2SAl Viroconfig AUDIT_GENERIC
244e65e1fc2SAl Viro	bool
245e65e1fc2SAl Viro	depends on AUDIT && !AUDIT_ARCH
246e65e1fc2SAl Viro	default y
247e65e1fc2SAl Viro
2484b588411SAKASHI Takahiroconfig AUDIT_ARCH_COMPAT_GENERIC
2494b588411SAKASHI Takahiro	bool
2504b588411SAKASHI Takahiro	default n
2514b588411SAKASHI Takahiro
2524b588411SAKASHI Takahiroconfig AUDIT_COMPAT_GENERIC
2534b588411SAKASHI Takahiro	bool
2544b588411SAKASHI Takahiro	depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
2554b588411SAKASHI Takahiro	default y
2564b588411SAKASHI Takahiro
257a6a9c0f1SDaniel Borkmannconfig RANDOM32_SELFTEST
258a6a9c0f1SDaniel Borkmann	bool "PRNG perform self test on init"
259a6a9c0f1SDaniel Borkmann	help
260a6a9c0f1SDaniel Borkmann	  This option enables the 32 bit PRNG library functions to perform a
261a6a9c0f1SDaniel Borkmann	  self test on initialization.
262a6a9c0f1SDaniel Borkmann
2631da177e4SLinus Torvalds#
2641da177e4SLinus Torvalds# compression support is select'ed if needed
2651da177e4SLinus Torvalds#
2662da572c9SDan Streetmanconfig 842_COMPRESS
2675b571677SArnd Bergmann	select CRC32
2682da572c9SDan Streetman	tristate
2692da572c9SDan Streetman
2702da572c9SDan Streetmanconfig 842_DECOMPRESS
2715b571677SArnd Bergmann	select CRC32
2722da572c9SDan Streetman	tristate
2732da572c9SDan Streetman
2741da177e4SLinus Torvaldsconfig ZLIB_INFLATE
2751da177e4SLinus Torvalds	tristate
2761da177e4SLinus Torvalds
2771da177e4SLinus Torvaldsconfig ZLIB_DEFLATE
2781da177e4SLinus Torvalds	tristate
2791fd4e5c3SAndrew Morton	select BITREVERSE
2801da177e4SLinus Torvalds
28164c70b1cSRichard Purdieconfig LZO_COMPRESS
28264c70b1cSRichard Purdie	tristate
28364c70b1cSRichard Purdie
28464c70b1cSRichard Purdieconfig LZO_DECOMPRESS
28564c70b1cSRichard Purdie	tristate
28664c70b1cSRichard Purdie
287c72ac7a1SChanho Minconfig LZ4_COMPRESS
288c72ac7a1SChanho Min	tristate
289c72ac7a1SChanho Min
290c72ac7a1SChanho Minconfig LZ4HC_COMPRESS
291c72ac7a1SChanho Min	tristate
292c72ac7a1SChanho Min
293e76e1fdfSKyungsik Leeconfig LZ4_DECOMPRESS
294e76e1fdfSKyungsik Lee	tristate
295e76e1fdfSKyungsik Lee
29673f3d1b4SNick Terrellconfig ZSTD_COMPRESS
29773f3d1b4SNick Terrell	select XXHASH
29873f3d1b4SNick Terrell	tristate
29973f3d1b4SNick Terrell
30073f3d1b4SNick Terrellconfig ZSTD_DECOMPRESS
30173f3d1b4SNick Terrell	select XXHASH
30273f3d1b4SNick Terrell	tristate
30373f3d1b4SNick Terrell
30424fa0402SLasse Collinsource "lib/xz/Kconfig"
30524fa0402SLasse Collin
3061da177e4SLinus Torvalds#
307c8531ab3SH. Peter Anvin# These all provide a common interface (hence the apparent duplication with
308c8531ab3SH. Peter Anvin# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
309c8531ab3SH. Peter Anvin#
310c8531ab3SH. Peter Anvinconfig DECOMPRESS_GZIP
3117856a16eSH. Peter Anvin	select ZLIB_INFLATE
312c8531ab3SH. Peter Anvin	tristate
313c8531ab3SH. Peter Anvin
314c8531ab3SH. Peter Anvinconfig DECOMPRESS_BZIP2
315c8531ab3SH. Peter Anvin	tristate
316c8531ab3SH. Peter Anvin
317c8531ab3SH. Peter Anvinconfig DECOMPRESS_LZMA
318c8531ab3SH. Peter Anvin	tristate
319c8531ab3SH. Peter Anvin
3203ebe1243SLasse Collinconfig DECOMPRESS_XZ
3213ebe1243SLasse Collin	select XZ_DEC
3223ebe1243SLasse Collin	tristate
3233ebe1243SLasse Collin
324cacb246fSAlbin Tonnerreconfig DECOMPRESS_LZO
325cacb246fSAlbin Tonnerre	select LZO_DECOMPRESS
326cacb246fSAlbin Tonnerre	tristate
327cacb246fSAlbin Tonnerre
328e76e1fdfSKyungsik Leeconfig DECOMPRESS_LZ4
329e76e1fdfSKyungsik Lee	select LZ4_DECOMPRESS
330e76e1fdfSKyungsik Lee	tristate
331e76e1fdfSKyungsik Lee
332c8531ab3SH. Peter Anvin#
333f14f75b8SJes Sorensen# Generic allocator support is selected if needed
334f14f75b8SJes Sorensen#
335f14f75b8SJes Sorensenconfig GENERIC_ALLOCATOR
3366341e62bSChristoph Jaeger	bool
337f14f75b8SJes Sorensen
338f14f75b8SJes Sorensen#
3391da177e4SLinus Torvalds# reed solomon support is select'ed if needed
3401da177e4SLinus Torvalds#
3411da177e4SLinus Torvaldsconfig REED_SOLOMON
3421da177e4SLinus Torvalds	tristate
3431da177e4SLinus Torvalds
3441da177e4SLinus Torvaldsconfig REED_SOLOMON_ENC8
3456341e62bSChristoph Jaeger	bool
3461da177e4SLinus Torvalds
3471da177e4SLinus Torvaldsconfig REED_SOLOMON_DEC8
3486341e62bSChristoph Jaeger	bool
3491da177e4SLinus Torvalds
3501da177e4SLinus Torvaldsconfig REED_SOLOMON_ENC16
3516341e62bSChristoph Jaeger	bool
3521da177e4SLinus Torvalds
3531da177e4SLinus Torvaldsconfig REED_SOLOMON_DEC16
3546341e62bSChristoph Jaeger	bool
3551da177e4SLinus Torvalds
356f7704347SDavid S. Miller#
357437aa565SIvan Djelic# BCH support is selected if needed
358437aa565SIvan Djelic#
359437aa565SIvan Djelicconfig BCH
360437aa565SIvan Djelic	tristate
361437aa565SIvan Djelic
362437aa565SIvan Djelicconfig BCH_CONST_PARAMS
3636341e62bSChristoph Jaeger	bool
364437aa565SIvan Djelic	help
365437aa565SIvan Djelic	  Drivers may select this option to force specific constant
366437aa565SIvan Djelic	  values for parameters 'm' (Galois field order) and 't'
367437aa565SIvan Djelic	  (error correction capability). Those specific values must
368437aa565SIvan Djelic	  be set by declaring default values for symbols BCH_CONST_M
369437aa565SIvan Djelic	  and BCH_CONST_T.
370437aa565SIvan Djelic	  Doing so will enable extra compiler optimizations,
371437aa565SIvan Djelic	  improving encoding and decoding performance up to 2x for
372437aa565SIvan Djelic	  usual (m,t) values (typically such that m*t < 200).
373437aa565SIvan Djelic	  When this option is selected, the BCH library supports
374437aa565SIvan Djelic	  only a single (m,t) configuration. This is mainly useful
375437aa565SIvan Djelic	  for NAND flash board drivers requiring known, fixed BCH
376437aa565SIvan Djelic	  parameters.
377437aa565SIvan Djelic
378437aa565SIvan Djelicconfig BCH_CONST_M
379437aa565SIvan Djelic	int
380437aa565SIvan Djelic	range 5 15
381437aa565SIvan Djelic	help
382437aa565SIvan Djelic	  Constant value for Galois field order 'm'. If 'k' is the
383437aa565SIvan Djelic	  number of data bits to protect, 'm' should be chosen such
384437aa565SIvan Djelic	  that (k + m*t) <= 2**m - 1.
385437aa565SIvan Djelic	  Drivers should declare a default value for this symbol if
386437aa565SIvan Djelic	  they select option BCH_CONST_PARAMS.
387437aa565SIvan Djelic
388437aa565SIvan Djelicconfig BCH_CONST_T
389437aa565SIvan Djelic	int
390437aa565SIvan Djelic	help
391437aa565SIvan Djelic	  Constant value for error correction capability in bits 't'.
392437aa565SIvan Djelic	  Drivers should declare a default value for this symbol if
393437aa565SIvan Djelic	  they select option BCH_CONST_PARAMS.
394437aa565SIvan Djelic
395437aa565SIvan Djelic#
396f7704347SDavid S. Miller# Textsearch support is select'ed if needed
397f7704347SDavid S. Miller#
3982de4ff7bSThomas Grafconfig TEXTSEARCH
3996341e62bSChristoph Jaeger	bool
4001da177e4SLinus Torvalds
401df3fb93aSThomas Grafconfig TEXTSEARCH_KMP
402f7704347SDavid S. Miller	tristate
403df3fb93aSThomas Graf
4048082e4edSPablo Neira Ayusoconfig TEXTSEARCH_BM
40529cb9f9cSDavid S. Miller	tristate
4068082e4edSPablo Neira Ayuso
4076408f79cSThomas Grafconfig TEXTSEARCH_FSM
408f7704347SDavid S. Miller	tristate
4096408f79cSThomas Graf
4105db53f3eSJoern Engelconfig BTREE
4116341e62bSChristoph Jaeger	bool
4125db53f3eSJoern Engel
413a88cc108SChris Wilsonconfig INTERVAL_TREE
4146341e62bSChristoph Jaeger	bool
415a88cc108SChris Wilson	help
416a88cc108SChris Wilson	  Simple, embeddable, interval-tree. Can find the start of an
417a88cc108SChris Wilson	  overlapping range in log(n) time and then iterate over all
418a88cc108SChris Wilson	  overlapping nodes. The algorithm is implemented as an
419a88cc108SChris Wilson	  augmented rbtree.
420a88cc108SChris Wilson
421a88cc108SChris Wilson	  See:
422a88cc108SChris Wilson
423a88cc108SChris Wilson		Documentation/rbtree.txt
424a88cc108SChris Wilson
425a88cc108SChris Wilson	  for more information.
426a88cc108SChris Wilson
42702c02bf1SMatthew Wilcoxconfig XARRAY_MULTI
42857578c2eSMatthew Wilcox	bool
42902c02bf1SMatthew Wilcox	help
43002c02bf1SMatthew Wilcox	  Support entries which occupy multiple consecutive indices in the
43102c02bf1SMatthew Wilcox	  XArray.
43257578c2eSMatthew Wilcox
4333cb98950SDavid Howellsconfig ASSOCIATIVE_ARRAY
4343cb98950SDavid Howells	bool
4353cb98950SDavid Howells	help
4363cb98950SDavid Howells	  Generic associative array.  Can be searched and iterated over whilst
4373cb98950SDavid Howells	  it is being modified.  It is also reasonably quick to search and
4383cb98950SDavid Howells	  modify.  The algorithms are non-recursive, and the trees are highly
4393cb98950SDavid Howells	  capacious.
4403cb98950SDavid Howells
4413cb98950SDavid Howells	  See:
4423cb98950SDavid Howells
4435fb94e9cSMauro Carvalho Chehab		Documentation/core-api/assoc_array.rst
4443cb98950SDavid Howells
4453cb98950SDavid Howells	  for more information.
4463cb98950SDavid Howells
4475ea81769SAl Viroconfig HAS_IOMEM
4486341e62bSChristoph Jaeger	bool
4495ea81769SAl Viro	depends on !NO_IOMEM
4505ea81769SAl Viro	default y
4515ea81769SAl Viro
452ce816fa8SUwe Kleine-Königconfig HAS_IOPORT_MAP
4536341e62bSChristoph Jaeger	bool
454ce816fa8SUwe Kleine-König	depends on HAS_IOMEM && !NO_IOPORT_MAP
455ee36c2bfSAl Viro	default y
456ee36c2bfSAl Viro
457cf65a0f6SChristoph Hellwigsource "kernel/dma/Kconfig"
458411f0f3eSHeiko Carstens
459e80a0af4SBart Van Asscheconfig SGL_ALLOC
460e80a0af4SBart Van Assche	bool
461e80a0af4SBart Van Assche	default n
462e80a0af4SBart Van Assche
463a4ce5a48SChristoph Hellwigconfig IOMMU_HELPER
464a4ce5a48SChristoph Hellwig	bool
465a4ce5a48SChristoph Hellwig
466928923c7SGeert Uytterhoevenconfig CHECK_SIGNATURE
467928923c7SGeert Uytterhoeven	bool
468928923c7SGeert Uytterhoeven
469aab46da0SRusty Russellconfig CPUMASK_OFFSTACK
470aab46da0SRusty Russell	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
471aab46da0SRusty Russell	help
472aab46da0SRusty Russell	  Use dynamic allocation for cpumask_var_t, instead of putting
473aab46da0SRusty Russell	  them on the stack.  This is a bit more expensive, but avoids
474aab46da0SRusty Russell	  stack overflow.
475aab46da0SRusty Russell
476c39649c3SBen Hutchingsconfig CPU_RMAP
477c39649c3SBen Hutchings	bool
478c39649c3SBen Hutchings	depends on SMP
479c39649c3SBen Hutchings
48075957ba3STom Herbertconfig DQL
48175957ba3STom Herbert	bool
48275957ba3STom Herbert
483b0125085SGeorge Spelvinconfig GLOB
484b0125085SGeorge Spelvin	bool
485b0125085SGeorge Spelvin#	This actually supports modular compilation, but the module overhead
486b0125085SGeorge Spelvin#	is ridiculous for the amount of code involved.	Until an out-of-tree
487b0125085SGeorge Spelvin#	driver asks for it, we'll just link it directly it into the kernel
488b0125085SGeorge Spelvin#	when required.  Since we're ignoring out-of-tree users,	there's also
489b0125085SGeorge Spelvin#	no need bother prompting for a manual decision:
490b0125085SGeorge Spelvin#	prompt "glob_match() function"
491b0125085SGeorge Spelvin	help
492b0125085SGeorge Spelvin	  This option provides a glob_match function for performing
493b0125085SGeorge Spelvin	  simple text pattern matching.  It originated in the ATA code
494b0125085SGeorge Spelvin	  to blacklist particular drive models, but other device drivers
495b0125085SGeorge Spelvin	  may need similar functionality.
496b0125085SGeorge Spelvin
497b0125085SGeorge Spelvin	  All drivers in the Linux kernel tree that require this function
498b0125085SGeorge Spelvin	  should automatically select this option.  Say N unless you
499b0125085SGeorge Spelvin	  are compiling an out-of tree driver which tells you that it
500b0125085SGeorge Spelvin	  depends on this.
501b0125085SGeorge Spelvin
5025f9be824SGeorge Spelvinconfig GLOB_SELFTEST
503ba95b045SGeert Uytterhoeven	tristate "glob self-test on init"
5045f9be824SGeorge Spelvin	depends on GLOB
5055f9be824SGeorge Spelvin	help
5065f9be824SGeorge Spelvin	  This option enables a simple self-test of the glob_match
5075f9be824SGeorge Spelvin	  function on startup.	It is primarily useful for people
5085f9be824SGeorge Spelvin	  working on the code to ensure they haven't introduced any
5095f9be824SGeorge Spelvin	  regressions.
5105f9be824SGeorge Spelvin
5115f9be824SGeorge Spelvin	  It only adds a little bit of code and slows kernel boot (or
5125f9be824SGeorge Spelvin	  module load) by a small amount, so you're welcome to play with
5135f9be824SGeorge Spelvin	  it, but you probably don't need it.
5145f9be824SGeorge Spelvin
515e9cc8bddSGeert Uytterhoeven#
516e9cc8bddSGeert Uytterhoeven# Netlink attribute parsing support is select'ed if needed
517e9cc8bddSGeert Uytterhoeven#
518e9cc8bddSGeert Uytterhoevenconfig NLATTR
519e9cc8bddSGeert Uytterhoeven	bool
520e9cc8bddSGeert Uytterhoeven
52109d4e0edSPaul Mackerras#
52209d4e0edSPaul Mackerras# Generic 64-bit atomic support is selected if needed
52309d4e0edSPaul Mackerras#
52409d4e0edSPaul Mackerrasconfig GENERIC_ATOMIC64
52509d4e0edSPaul Mackerras       bool
52609d4e0edSPaul Mackerras
527b411b363SPhilipp Reisnerconfig LRU_CACHE
528b411b363SPhilipp Reisner	tristate
529b411b363SPhilipp Reisner
530c6df4b17SDavid Millerconfig CLZ_TAB
531c6df4b17SDavid Miller	bool
532c6df4b17SDavid Miller
533511cbce2SChristoph Hellwigconfig IRQ_POLL
534511cbce2SChristoph Hellwig	bool "IRQ polling library"
535511cbce2SChristoph Hellwig	help
536511cbce2SChristoph Hellwig	  Helper library to poll interrupt mitigation using polling.
537511cbce2SChristoph Hellwig
538d9c46b18SDmitry Kasatkinconfig MPILIB
5392e5f094bSDmitry Kasatkin	tristate
540c6df4b17SDavid Miller	select CLZ_TAB
541d9c46b18SDmitry Kasatkin	help
542d9c46b18SDmitry Kasatkin	  Multiprecision maths library from GnuPG.
543d9c46b18SDmitry Kasatkin	  It is used to implement RSA digital signature verification,
544d9c46b18SDmitry Kasatkin	  which is used by IMA/EVM digital signature extension.
545d9c46b18SDmitry Kasatkin
5465e8898e9SDmitry Kasatkinconfig SIGNATURE
5472e5f094bSDmitry Kasatkin	tristate
5480d1f64f6SDmitry Kasatkin	depends on KEYS
5490d1f64f6SDmitry Kasatkin	select CRYPTO
550be440ec7SDmitry Kasatkin	select CRYPTO_SHA1
551051dbb91SDmitry Kasatkin	select MPILIB
552051dbb91SDmitry Kasatkin	help
553051dbb91SDmitry Kasatkin	  Digital signature verification. Currently only RSA is supported.
554051dbb91SDmitry Kasatkin	  Implementation is done using GnuPG MPI library
555051dbb91SDmitry Kasatkin
5564f75da36STal Gilboaconfig DIMLIB
557424adc32SUwe Kleine-König	bool
5584f75da36STal Gilboa	help
5594f75da36STal Gilboa	  Dynamic Interrupt Moderation library.
560991ad2b2SRandy Dunlap	  Implements an algorithm for dynamically changing CQ moderation values
5614f75da36STal Gilboa	  according to run time performance.
5624f75da36STal Gilboa
563ab253839SDavid Daney#
564ab253839SDavid Daney# libfdt files, only selected if needed.
565ab253839SDavid Daney#
566ab253839SDavid Daneyconfig LIBFDT
567ab253839SDavid Daney	bool
568ab253839SDavid Daney
569a77ad6eaSDavid Howellsconfig OID_REGISTRY
570a77ad6eaSDavid Howells	tristate
571a77ad6eaSDavid Howells	help
572a77ad6eaSDavid Howells	  Enable fast lookup object identifier registry.
573a77ad6eaSDavid Howells
5740635eb8aSMatthew Garrettconfig UCS2_STRING
5750635eb8aSMatthew Garrett        tristate
5760635eb8aSMatthew Garrett
57700b26474SVincenzo Frascino#
57800b26474SVincenzo Frascino# generic vdso
57900b26474SVincenzo Frascino#
58000b26474SVincenzo Frascinosource "lib/vdso/Kconfig"
58100b26474SVincenzo Frascino
582ee89bd6bSGeert Uytterhoevensource "lib/fonts/Kconfig"
583ee89bd6bSGeert Uytterhoeven
584f8bcbe62SRobert Jarzmikconfig SG_SPLIT
585f8bcbe62SRobert Jarzmik	def_bool n
586f8bcbe62SRobert Jarzmik	help
5877f7e92f7SGeert Uytterhoeven	 Provides a helper to split scatterlists into chunks, each chunk being
5887f7e92f7SGeert Uytterhoeven	 a scatterlist. This should be selected by a driver or an API which
5897f7e92f7SGeert Uytterhoeven	 whishes to split a scatterlist amongst multiple DMA channels.
590f8bcbe62SRobert Jarzmik
5919b1d6c89SMing Linconfig SG_POOL
5929b1d6c89SMing Lin	def_bool n
5939b1d6c89SMing Lin	help
5949b1d6c89SMing Lin	 Provides a helper to allocate chained scatterlists. This should be
5959b1d6c89SMing Lin	 selected by a driver or an API which whishes to allocate chained
5969b1d6c89SMing Lin	 scatterlist.
5979b1d6c89SMing Lin
598308c09f1SLaura Abbott#
599308c09f1SLaura Abbott# sg chaining option
600308c09f1SLaura Abbott#
601308c09f1SLaura Abbott
6027c703e54SChristoph Hellwigconfig ARCH_NO_SG_CHAIN
603308c09f1SLaura Abbott	def_bool n
604308c09f1SLaura Abbott
60561031952SRoss Zwislerconfig ARCH_HAS_PMEM_API
60661031952SRoss Zwisler	bool
60761031952SRoss Zwisler
608bd79f947SChristoph Hellwig# use memcpy to implement user copies for nommu architectures
609bd79f947SChristoph Hellwigconfig UACCESS_MEMCPY
610bd79f947SChristoph Hellwig	bool
611bd79f947SChristoph Hellwig
6120aed55afSDan Williamsconfig ARCH_HAS_UACCESS_FLUSHCACHE
6130aed55afSDan Williams	bool
6140aed55afSDan Williams
615522239b4SDan Williamsconfig ARCH_HAS_UACCESS_MCSAFE
616522239b4SDan Williams	bool
617522239b4SDan Williams
618214d8ca6SThomas Gleixner# Temporary. Goes away when all archs are cleaned up
619214d8ca6SThomas Gleixnerconfig ARCH_STACKWALK
620214d8ca6SThomas Gleixner       bool
621214d8ca6SThomas Gleixner
622cd11016eSAlexander Potapenkoconfig STACKDEPOT
623cd11016eSAlexander Potapenko	bool
624cd11016eSAlexander Potapenko	select STACKTRACE
625cd11016eSAlexander Potapenko
62688459642SOmar Sandovalconfig SBITMAP
62788459642SOmar Sandoval	bool
62888459642SOmar Sandoval
62944091d29SJiri Pirkoconfig PARMAN
6309d25af69SGeert Uytterhoeven	tristate "parman" if COMPILE_TEST
63144091d29SJiri Pirko
6323dfdecc6SRandy Dunlapconfig OBJAGG
6333dfdecc6SRandy Dunlap	tristate "objagg" if COMPILE_TEST
6343dfdecc6SRandy Dunlap
63503270c13SMatthew Wilcoxconfig STRING_SELFTEST
636d6b28e09SGeert Uytterhoeven	tristate "Test string functions"
63703270c13SMatthew Wilcox
6382de4ff7bSThomas Grafendmenu
639b35cd988SPalmer Dabbelt
640*80b0ca98SChristoph Hellwigconfig GENERIC_IOREMAP
641*80b0ca98SChristoph Hellwig	bool
642*80b0ca98SChristoph Hellwig
643e3d59805SMatt Redfearnconfig GENERIC_LIB_ASHLDI3
644b35cd988SPalmer Dabbelt	bool
645b35cd988SPalmer Dabbelt
646e3d59805SMatt Redfearnconfig GENERIC_LIB_ASHRDI3
647b35cd988SPalmer Dabbelt	bool
648b35cd988SPalmer Dabbelt
649e3d59805SMatt Redfearnconfig GENERIC_LIB_LSHRDI3
650b35cd988SPalmer Dabbelt	bool
651b35cd988SPalmer Dabbelt
652e3d59805SMatt Redfearnconfig GENERIC_LIB_MULDI3
653b35cd988SPalmer Dabbelt	bool
654b35cd988SPalmer Dabbelt
655e3d59805SMatt Redfearnconfig GENERIC_LIB_CMPDI2
656b35cd988SPalmer Dabbelt	bool
657b35cd988SPalmer Dabbelt
658e3d59805SMatt Redfearnconfig GENERIC_LIB_UCMPDI2
659b35cd988SPalmer Dabbelt	bool
660