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 22d2218d4eSMatti Vaittinenconfig LINEAR_RANGES 23d2218d4eSMatti Vaittinen tristate 24d2218d4eSMatti Vaittinen 25554aae35SVladimir Olteanconfig PACKING 26554aae35SVladimir Oltean bool "Generic bitfield packing and unpacking" 27554aae35SVladimir Oltean default n 28554aae35SVladimir Oltean help 29554aae35SVladimir Oltean This option provides the packing() helper function, which permits 30554aae35SVladimir Oltean converting bitfields between a CPU-usable representation and a 31554aae35SVladimir Oltean memory representation that can have any combination of these quirks: 32554aae35SVladimir Oltean - Is little endian (bytes are reversed within a 32-bit group) 33554aae35SVladimir Oltean - The least-significant 32-bit word comes first (within a 64-bit 34554aae35SVladimir Oltean group) 35554aae35SVladimir Oltean - The most significant bit of a byte is at its right (bit 0 of a 36554aae35SVladimir Oltean register description is numerically 2^7). 37554aae35SVladimir Oltean Drivers may use these helpers to match the bit indices as described 38554aae35SVladimir Oltean in the data sheets of the peripherals they are in control of. 39554aae35SVladimir Oltean 40554aae35SVladimir Oltean When in doubt, say N. 41554aae35SVladimir Oltean 42a5cfc1ecSAkinobu Mitaconfig BITREVERSE 43a5cfc1ecSAkinobu Mita tristate 44a5cfc1ecSAkinobu Mita 45556d2f05SYalin Wangconfig HAVE_ARCH_BITREVERSE 46841c0090SChristoph Jaeger bool 47556d2f05SYalin Wang default n 48556d2f05SYalin Wang depends on BITREVERSE 49556d2f05SYalin Wang help 509e522c0dSAndrew Morton This option enables the use of hardware bit-reversal instructions on 519e522c0dSAndrew Morton architectures which support such operations. 52556d2f05SYalin Wang 532922585bSDavid S. Millerconfig GENERIC_STRNCPY_FROM_USER 542922585bSDavid S. Miller bool 552922585bSDavid S. Miller 56a08c5356SLinus Torvaldsconfig GENERIC_STRNLEN_USER 57a08c5356SLinus Torvalds bool 58a08c5356SLinus Torvalds 594cd5773aSAndy Shevchenkoconfig GENERIC_NET_UTILS 604cd5773aSAndy Shevchenko bool 614cd5773aSAndy Shevchenko 6219870defSAlexander van Heukelumconfig GENERIC_FIND_FIRST_BIT 639ba16087SJan Beulich bool 6419870defSAlexander van Heukelum 652c64e9cbSAndy Shevchenkosource "lib/math/Kconfig" 662c64e9cbSAndy Shevchenko 67b923650bSMichael S. Tsirkinconfig NO_GENERIC_PCI_IOPORT_MAP 68b923650bSMichael S. Tsirkin bool 69b923650bSMichael S. Tsirkin 7066eab4dfSMichael S. Tsirkinconfig GENERIC_PCI_IOMAP 7166eab4dfSMichael S. Tsirkin bool 7266eab4dfSMichael S. Tsirkin 734673ca8eSMichael S. Tsirkinconfig GENERIC_IOMAP 744673ca8eSMichael S. Tsirkin bool 7566eab4dfSMichael S. Tsirkin select GENERIC_PCI_IOMAP 764673ca8eSMichael S. Tsirkin 774ccf4beaSWolfram Sangconfig STMP_DEVICE 784ccf4beaSWolfram Sang bool 794ccf4beaSWolfram Sang 80bc08b449SLinus Torvaldsconfig ARCH_USE_CMPXCHG_LOCKREF 81bc08b449SLinus Torvalds bool 82bc08b449SLinus Torvalds 8372d93104SLinus Torvaldsconfig ARCH_HAS_FAST_MULTIPLIER 8472d93104SLinus Torvalds bool 8572d93104SLinus Torvalds 862ce0d7f9SMark Brownconfig ARCH_USE_SYM_ANNOTATIONS 872ce0d7f9SMark Brown bool 882ce0d7f9SMark Brown 89031e3601SZhichang Yuanconfig INDIRECT_PIO 90031e3601SZhichang Yuan bool "Access I/O in non-MMIO mode" 91031e3601SZhichang Yuan depends on ARM64 92031e3601SZhichang Yuan help 93031e3601SZhichang Yuan On some platforms where no separate I/O space exists, there are I/O 94031e3601SZhichang Yuan hosts which can not be accessed in MMIO mode. Using the logical PIO 95031e3601SZhichang Yuan mechanism, the host-local I/O resource can be mapped into system 96031e3601SZhichang Yuan logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the 97031e3601SZhichang Yuan system can access the I/O devices with the mapped-logic PIO through 98031e3601SZhichang Yuan I/O accessors. 99031e3601SZhichang Yuan 100031e3601SZhichang Yuan This way has relatively little I/O performance cost. Please make 101031e3601SZhichang Yuan sure your devices really need this configure item enabled. 102031e3601SZhichang Yuan 103031e3601SZhichang Yuan When in doubt, say N. 104031e3601SZhichang Yuan 1051da177e4SLinus Torvaldsconfig CRC_CCITT 1061da177e4SLinus Torvalds tristate "CRC-CCITT functions" 1071da177e4SLinus Torvalds help 1081da177e4SLinus Torvalds This option is provided for the case where no in-kernel-tree 1091da177e4SLinus Torvalds modules require CRC-CCITT functions, but a module built outside 1101da177e4SLinus Torvalds the kernel tree does. Such modules that use library CRC-CCITT 1111da177e4SLinus Torvalds functions require M here. 1121da177e4SLinus Torvalds 1137657ec1fSEvgeniy Polyakovconfig CRC16 1147657ec1fSEvgeniy Polyakov tristate "CRC16 functions" 1157657ec1fSEvgeniy Polyakov help 1167657ec1fSEvgeniy Polyakov This option is provided for the case where no in-kernel-tree 1177657ec1fSEvgeniy Polyakov modules require CRC16 functions, but a module built outside 1187657ec1fSEvgeniy Polyakov the kernel tree does. Such modules that use library CRC16 1197657ec1fSEvgeniy Polyakov functions require M here. 1207657ec1fSEvgeniy Polyakov 121f11f594eSMartin K. Petersenconfig CRC_T10DIF 122f11f594eSMartin K. Petersen tristate "CRC calculation for the T10 Data Integrity Field" 12368411521SHerbert Xu select CRYPTO 12468411521SHerbert Xu select CRYPTO_CRCT10DIF 125f11f594eSMartin K. Petersen help 126f11f594eSMartin K. Petersen This option is only needed if a module that's not in the 127f11f594eSMartin K. Petersen kernel tree needs to calculate CRC checks for use with the 128f11f594eSMartin K. Petersen SCSI data integrity subsystem. 129f11f594eSMartin K. Petersen 1303e7cbae7SIvo van Doornconfig CRC_ITU_T 1313e7cbae7SIvo van Doorn tristate "CRC ITU-T V.41 functions" 1323e7cbae7SIvo van Doorn help 1333e7cbae7SIvo van Doorn This option is provided for the case where no in-kernel-tree 1343e7cbae7SIvo van Doorn modules require CRC ITU-T V.41 functions, but a module built outside 1353e7cbae7SIvo van Doorn the kernel tree does. Such modules that use library CRC ITU-T V.41 1363e7cbae7SIvo van Doorn functions require M here. 1373e7cbae7SIvo van Doorn 1381da177e4SLinus Torvaldsconfig CRC32 13946c5801eSDarrick J. Wong tristate "CRC32/CRC32c functions" 1401da177e4SLinus Torvalds default y 141906d66dfSAkinobu Mita select BITREVERSE 1421da177e4SLinus Torvalds help 1431da177e4SLinus Torvalds This option is provided for the case where no in-kernel-tree 14446c5801eSDarrick J. Wong modules require CRC32/CRC32c functions, but a module built outside 14546c5801eSDarrick J. Wong the kernel tree does. Such modules that use library CRC32/CRC32c 14646c5801eSDarrick J. Wong functions require M here. 1471da177e4SLinus Torvalds 1483863ef31SBob Pearsonconfig CRC32_SELFTEST 1495fb7f874SGeert Uytterhoeven tristate "CRC32 perform self test on init" 1503863ef31SBob Pearson depends on CRC32 1513863ef31SBob Pearson help 1523863ef31SBob Pearson This option enables the CRC32 library functions to perform a 1533863ef31SBob Pearson self test on initialization. The self test computes crc32_le 1543863ef31SBob Pearson and crc32_be over byte strings with random alignment and length 1553863ef31SBob Pearson and computes the total elapsed time and number of bytes processed. 1563863ef31SBob Pearson 1575cde7656SDarrick J. Wongchoice 1585cde7656SDarrick J. Wong prompt "CRC32 implementation" 1595cde7656SDarrick J. Wong depends on CRC32 1605cde7656SDarrick J. Wong default CRC32_SLICEBY8 16182edb4baSDarrick J. Wong help 16282edb4baSDarrick J. Wong This option allows a kernel builder to override the default choice 16382edb4baSDarrick J. Wong of CRC32 algorithm. Choose the default ("slice by 8") unless you 16482edb4baSDarrick J. Wong know that you need one of the others. 1655cde7656SDarrick J. Wong 1665cde7656SDarrick J. Wongconfig CRC32_SLICEBY8 1675cde7656SDarrick J. Wong bool "Slice by 8 bytes" 1685cde7656SDarrick J. Wong help 1695cde7656SDarrick J. Wong Calculate checksum 8 bytes at a time with a clever slicing algorithm. 1705cde7656SDarrick J. Wong This is the fastest algorithm, but comes with a 8KiB lookup table. 1715cde7656SDarrick J. Wong Most modern processors have enough cache to hold this table without 1725cde7656SDarrick J. Wong thrashing the cache. 1735cde7656SDarrick J. Wong 1745cde7656SDarrick J. Wong This is the default implementation choice. Choose this one unless 1755cde7656SDarrick J. Wong you have a good reason not to. 1765cde7656SDarrick J. Wong 1775cde7656SDarrick J. Wongconfig CRC32_SLICEBY4 1785cde7656SDarrick J. Wong bool "Slice by 4 bytes" 1795cde7656SDarrick J. Wong help 1805cde7656SDarrick J. Wong Calculate checksum 4 bytes at a time with a clever slicing algorithm. 1815cde7656SDarrick J. Wong This is a bit slower than slice by 8, but has a smaller 4KiB lookup 1825cde7656SDarrick J. Wong table. 1835cde7656SDarrick J. Wong 1845cde7656SDarrick J. Wong Only choose this option if you know what you are doing. 1855cde7656SDarrick J. Wong 1865cde7656SDarrick J. Wongconfig CRC32_SARWATE 1875cde7656SDarrick J. Wong bool "Sarwate's Algorithm (one byte at a time)" 1885cde7656SDarrick J. Wong help 1895cde7656SDarrick J. Wong Calculate checksum a byte at a time using Sarwate's algorithm. This 1905cde7656SDarrick J. Wong is not particularly fast, but has a small 256 byte lookup table. 1915cde7656SDarrick J. Wong 1925cde7656SDarrick J. Wong Only choose this option if you know what you are doing. 1935cde7656SDarrick J. Wong 1945cde7656SDarrick J. Wongconfig CRC32_BIT 1955cde7656SDarrick J. Wong bool "Classic Algorithm (one bit at a time)" 1965cde7656SDarrick J. Wong help 1975cde7656SDarrick J. Wong Calculate checksum one bit at a time. This is VERY slow, but has 1985cde7656SDarrick J. Wong no lookup table. This is provided as a debugging option. 1995cde7656SDarrick J. Wong 2005cde7656SDarrick J. Wong Only choose this option if you are debugging crc32. 2015cde7656SDarrick J. Wong 2025cde7656SDarrick J. Wongendchoice 2035cde7656SDarrick J. Wong 204feba04fdSColy Liconfig CRC64 205feba04fdSColy Li tristate "CRC64 functions" 206feba04fdSColy Li help 207feba04fdSColy Li This option is provided for the case where no in-kernel-tree 208feba04fdSColy Li modules require CRC64 functions, but a module built outside 209feba04fdSColy Li the kernel tree does. Such modules that use library CRC64 210feba04fdSColy Li functions require M here. 211feba04fdSColy Li 2120cbaa448SJeremy Kerrconfig CRC4 2130cbaa448SJeremy Kerr tristate "CRC4 functions" 2140cbaa448SJeremy Kerr help 2150cbaa448SJeremy Kerr This option is provided for the case where no in-kernel-tree 2160cbaa448SJeremy Kerr modules require CRC4 functions, but a module built outside 2170cbaa448SJeremy Kerr the kernel tree does. Such modules that use library CRC4 2180cbaa448SJeremy Kerr functions require M here. 2190cbaa448SJeremy Kerr 220ad241528SJan Nikitenkoconfig CRC7 221ad241528SJan Nikitenko tristate "CRC7 functions" 222ad241528SJan Nikitenko help 223ad241528SJan Nikitenko This option is provided for the case where no in-kernel-tree 224ad241528SJan Nikitenko modules require CRC7 functions, but a module built outside 225ad241528SJan Nikitenko the kernel tree does. Such modules that use library CRC7 226ad241528SJan Nikitenko functions require M here. 227ad241528SJan Nikitenko 2281da177e4SLinus Torvaldsconfig LIBCRC32C 2291da177e4SLinus Torvalds tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 23093027354SHerbert Xu select CRYPTO 23169c35efcSHerbert Xu select CRYPTO_CRC32C 2321da177e4SLinus Torvalds help 2331da177e4SLinus Torvalds This option is provided for the case where no in-kernel-tree 2341da177e4SLinus Torvalds modules require CRC32c functions, but a module built outside the 2351da177e4SLinus Torvalds kernel tree does. Such modules that use library CRC32c functions 2361da177e4SLinus Torvalds require M here. See Castagnoli93. 2371da177e4SLinus Torvalds Module will be libcrc32c. 2381da177e4SLinus Torvalds 2397150962dSArend van Sprielconfig CRC8 2407150962dSArend van Spriel tristate "CRC8 function" 2417150962dSArend van Spriel help 2427150962dSArend van Spriel This option provides CRC8 function. Drivers may select this 2437150962dSArend van Spriel when they need to do cyclic redundancy check according CRC8 2447150962dSArend van Spriel algorithm. Module will be called crc8. 2457150962dSArend van Spriel 2465d240522SNick Terrellconfig XXHASH 2475d240522SNick Terrell tristate 2485d240522SNick Terrell 249e65e1fc2SAl Viroconfig AUDIT_GENERIC 250e65e1fc2SAl Viro bool 251e65e1fc2SAl Viro depends on AUDIT && !AUDIT_ARCH 252e65e1fc2SAl Viro default y 253e65e1fc2SAl Viro 2544b588411SAKASHI Takahiroconfig AUDIT_ARCH_COMPAT_GENERIC 2554b588411SAKASHI Takahiro bool 2564b588411SAKASHI Takahiro default n 2574b588411SAKASHI Takahiro 2584b588411SAKASHI Takahiroconfig AUDIT_COMPAT_GENERIC 2594b588411SAKASHI Takahiro bool 2604b588411SAKASHI Takahiro depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 2614b588411SAKASHI Takahiro default y 2624b588411SAKASHI Takahiro 263a6a9c0f1SDaniel Borkmannconfig RANDOM32_SELFTEST 264a6a9c0f1SDaniel Borkmann bool "PRNG perform self test on init" 265a6a9c0f1SDaniel Borkmann help 266a6a9c0f1SDaniel Borkmann This option enables the 32 bit PRNG library functions to perform a 267a6a9c0f1SDaniel Borkmann self test on initialization. 268a6a9c0f1SDaniel Borkmann 2691da177e4SLinus Torvalds# 2701da177e4SLinus Torvalds# compression support is select'ed if needed 2711da177e4SLinus Torvalds# 2722da572c9SDan Streetmanconfig 842_COMPRESS 2735b571677SArnd Bergmann select CRC32 2742da572c9SDan Streetman tristate 2752da572c9SDan Streetman 2762da572c9SDan Streetmanconfig 842_DECOMPRESS 2775b571677SArnd Bergmann select CRC32 2782da572c9SDan Streetman tristate 2792da572c9SDan Streetman 2801da177e4SLinus Torvaldsconfig ZLIB_INFLATE 2811da177e4SLinus Torvalds tristate 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvaldsconfig ZLIB_DEFLATE 2841da177e4SLinus Torvalds tristate 2851fd4e5c3SAndrew Morton select BITREVERSE 2861da177e4SLinus Torvalds 287aa5b395bSMikhail Zaslonkoconfig ZLIB_DFLTCC 288aa5b395bSMikhail Zaslonko def_bool y 289aa5b395bSMikhail Zaslonko depends on S390 290aa5b395bSMikhail Zaslonko prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib" 291aa5b395bSMikhail Zaslonko help 292aa5b395bSMikhail Zaslonko Enable s390x hardware support for zlib in the kernel. 293aa5b395bSMikhail Zaslonko 29464c70b1cSRichard Purdieconfig LZO_COMPRESS 29564c70b1cSRichard Purdie tristate 29664c70b1cSRichard Purdie 29764c70b1cSRichard Purdieconfig LZO_DECOMPRESS 29864c70b1cSRichard Purdie tristate 29964c70b1cSRichard Purdie 300c72ac7a1SChanho Minconfig LZ4_COMPRESS 301c72ac7a1SChanho Min tristate 302c72ac7a1SChanho Min 303c72ac7a1SChanho Minconfig LZ4HC_COMPRESS 304c72ac7a1SChanho Min tristate 305c72ac7a1SChanho Min 306e76e1fdfSKyungsik Leeconfig LZ4_DECOMPRESS 307e76e1fdfSKyungsik Lee tristate 308e76e1fdfSKyungsik Lee 30973f3d1b4SNick Terrellconfig ZSTD_COMPRESS 31073f3d1b4SNick Terrell select XXHASH 31173f3d1b4SNick Terrell tristate 31273f3d1b4SNick Terrell 31373f3d1b4SNick Terrellconfig ZSTD_DECOMPRESS 31473f3d1b4SNick Terrell select XXHASH 31573f3d1b4SNick Terrell tristate 31673f3d1b4SNick Terrell 31724fa0402SLasse Collinsource "lib/xz/Kconfig" 31824fa0402SLasse Collin 3191da177e4SLinus Torvalds# 320c8531ab3SH. Peter Anvin# These all provide a common interface (hence the apparent duplication with 321c8531ab3SH. Peter Anvin# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 322c8531ab3SH. Peter Anvin# 323c8531ab3SH. Peter Anvinconfig DECOMPRESS_GZIP 3247856a16eSH. Peter Anvin select ZLIB_INFLATE 325c8531ab3SH. Peter Anvin tristate 326c8531ab3SH. Peter Anvin 327c8531ab3SH. Peter Anvinconfig DECOMPRESS_BZIP2 328c8531ab3SH. Peter Anvin tristate 329c8531ab3SH. Peter Anvin 330c8531ab3SH. Peter Anvinconfig DECOMPRESS_LZMA 331c8531ab3SH. Peter Anvin tristate 332c8531ab3SH. Peter Anvin 3333ebe1243SLasse Collinconfig DECOMPRESS_XZ 3343ebe1243SLasse Collin select XZ_DEC 3353ebe1243SLasse Collin tristate 3363ebe1243SLasse Collin 337cacb246fSAlbin Tonnerreconfig DECOMPRESS_LZO 338cacb246fSAlbin Tonnerre select LZO_DECOMPRESS 339cacb246fSAlbin Tonnerre tristate 340cacb246fSAlbin Tonnerre 341e76e1fdfSKyungsik Leeconfig DECOMPRESS_LZ4 342e76e1fdfSKyungsik Lee select LZ4_DECOMPRESS 343e76e1fdfSKyungsik Lee tristate 344e76e1fdfSKyungsik Lee 3454963bb2bSNick Terrellconfig DECOMPRESS_ZSTD 3464963bb2bSNick Terrell select ZSTD_DECOMPRESS 3474963bb2bSNick Terrell tristate 3484963bb2bSNick Terrell 349c8531ab3SH. Peter Anvin# 350f14f75b8SJes Sorensen# Generic allocator support is selected if needed 351f14f75b8SJes Sorensen# 352f14f75b8SJes Sorensenconfig GENERIC_ALLOCATOR 3536341e62bSChristoph Jaeger bool 354f14f75b8SJes Sorensen 355f14f75b8SJes Sorensen# 3561da177e4SLinus Torvalds# reed solomon support is select'ed if needed 3571da177e4SLinus Torvalds# 3581da177e4SLinus Torvaldsconfig REED_SOLOMON 3591da177e4SLinus Torvalds tristate 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvaldsconfig REED_SOLOMON_ENC8 3626341e62bSChristoph Jaeger bool 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvaldsconfig REED_SOLOMON_DEC8 3656341e62bSChristoph Jaeger bool 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvaldsconfig REED_SOLOMON_ENC16 3686341e62bSChristoph Jaeger bool 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvaldsconfig REED_SOLOMON_DEC16 3716341e62bSChristoph Jaeger bool 3721da177e4SLinus Torvalds 373f7704347SDavid S. Miller# 374437aa565SIvan Djelic# BCH support is selected if needed 375437aa565SIvan Djelic# 376437aa565SIvan Djelicconfig BCH 377437aa565SIvan Djelic tristate 378437aa565SIvan Djelic 379437aa565SIvan Djelicconfig BCH_CONST_PARAMS 3806341e62bSChristoph Jaeger bool 381437aa565SIvan Djelic help 382437aa565SIvan Djelic Drivers may select this option to force specific constant 383437aa565SIvan Djelic values for parameters 'm' (Galois field order) and 't' 384437aa565SIvan Djelic (error correction capability). Those specific values must 385437aa565SIvan Djelic be set by declaring default values for symbols BCH_CONST_M 386437aa565SIvan Djelic and BCH_CONST_T. 387437aa565SIvan Djelic Doing so will enable extra compiler optimizations, 388437aa565SIvan Djelic improving encoding and decoding performance up to 2x for 389437aa565SIvan Djelic usual (m,t) values (typically such that m*t < 200). 390437aa565SIvan Djelic When this option is selected, the BCH library supports 391437aa565SIvan Djelic only a single (m,t) configuration. This is mainly useful 392437aa565SIvan Djelic for NAND flash board drivers requiring known, fixed BCH 393437aa565SIvan Djelic parameters. 394437aa565SIvan Djelic 395437aa565SIvan Djelicconfig BCH_CONST_M 396437aa565SIvan Djelic int 397437aa565SIvan Djelic range 5 15 398437aa565SIvan Djelic help 399437aa565SIvan Djelic Constant value for Galois field order 'm'. If 'k' is the 400437aa565SIvan Djelic number of data bits to protect, 'm' should be chosen such 401437aa565SIvan Djelic that (k + m*t) <= 2**m - 1. 402437aa565SIvan Djelic Drivers should declare a default value for this symbol if 403437aa565SIvan Djelic they select option BCH_CONST_PARAMS. 404437aa565SIvan Djelic 405437aa565SIvan Djelicconfig BCH_CONST_T 406437aa565SIvan Djelic int 407437aa565SIvan Djelic help 408437aa565SIvan Djelic Constant value for error correction capability in bits 't'. 409437aa565SIvan Djelic Drivers should declare a default value for this symbol if 410437aa565SIvan Djelic they select option BCH_CONST_PARAMS. 411437aa565SIvan Djelic 412437aa565SIvan Djelic# 413f7704347SDavid S. Miller# Textsearch support is select'ed if needed 414f7704347SDavid S. Miller# 4152de4ff7bSThomas Grafconfig TEXTSEARCH 4166341e62bSChristoph Jaeger bool 4171da177e4SLinus Torvalds 418df3fb93aSThomas Grafconfig TEXTSEARCH_KMP 419f7704347SDavid S. Miller tristate 420df3fb93aSThomas Graf 4218082e4edSPablo Neira Ayusoconfig TEXTSEARCH_BM 42229cb9f9cSDavid S. Miller tristate 4238082e4edSPablo Neira Ayuso 4246408f79cSThomas Grafconfig TEXTSEARCH_FSM 425f7704347SDavid S. Miller tristate 4266408f79cSThomas Graf 4275db53f3eSJoern Engelconfig BTREE 4286341e62bSChristoph Jaeger bool 4295db53f3eSJoern Engel 430a88cc108SChris Wilsonconfig INTERVAL_TREE 4316341e62bSChristoph Jaeger bool 432a88cc108SChris Wilson help 433a88cc108SChris Wilson Simple, embeddable, interval-tree. Can find the start of an 434a88cc108SChris Wilson overlapping range in log(n) time and then iterate over all 435a88cc108SChris Wilson overlapping nodes. The algorithm is implemented as an 436a88cc108SChris Wilson augmented rbtree. 437a88cc108SChris Wilson 438a88cc108SChris Wilson See: 439a88cc108SChris Wilson 44014bbe3e3SMatthew Wilcox (Oracle) Documentation/core-api/rbtree.rst 441a88cc108SChris Wilson 442a88cc108SChris Wilson for more information. 443a88cc108SChris Wilson 44402c02bf1SMatthew Wilcoxconfig XARRAY_MULTI 44557578c2eSMatthew Wilcox bool 44602c02bf1SMatthew Wilcox help 44702c02bf1SMatthew Wilcox Support entries which occupy multiple consecutive indices in the 44802c02bf1SMatthew Wilcox XArray. 44957578c2eSMatthew Wilcox 4503cb98950SDavid Howellsconfig ASSOCIATIVE_ARRAY 4513cb98950SDavid Howells bool 4523cb98950SDavid Howells help 4533cb98950SDavid Howells Generic associative array. Can be searched and iterated over whilst 4543cb98950SDavid Howells it is being modified. It is also reasonably quick to search and 4553cb98950SDavid Howells modify. The algorithms are non-recursive, and the trees are highly 4563cb98950SDavid Howells capacious. 4573cb98950SDavid Howells 4583cb98950SDavid Howells See: 4593cb98950SDavid Howells 4605fb94e9cSMauro Carvalho Chehab Documentation/core-api/assoc_array.rst 4613cb98950SDavid Howells 4623cb98950SDavid Howells for more information. 4633cb98950SDavid Howells 4645ea81769SAl Viroconfig HAS_IOMEM 4656341e62bSChristoph Jaeger bool 4665ea81769SAl Viro depends on !NO_IOMEM 4675ea81769SAl Viro default y 4685ea81769SAl Viro 469ce816fa8SUwe Kleine-Königconfig HAS_IOPORT_MAP 4706341e62bSChristoph Jaeger bool 471ce816fa8SUwe Kleine-König depends on HAS_IOMEM && !NO_IOPORT_MAP 472ee36c2bfSAl Viro default y 473ee36c2bfSAl Viro 474cf65a0f6SChristoph Hellwigsource "kernel/dma/Kconfig" 475411f0f3eSHeiko Carstens 476e80a0af4SBart Van Asscheconfig SGL_ALLOC 477e80a0af4SBart Van Assche bool 478e80a0af4SBart Van Assche default n 479e80a0af4SBart Van Assche 480a4ce5a48SChristoph Hellwigconfig IOMMU_HELPER 481a4ce5a48SChristoph Hellwig bool 482a4ce5a48SChristoph Hellwig 483928923c7SGeert Uytterhoevenconfig CHECK_SIGNATURE 484928923c7SGeert Uytterhoeven bool 485928923c7SGeert Uytterhoeven 486aab46da0SRusty Russellconfig CPUMASK_OFFSTACK 487aab46da0SRusty Russell bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 488aab46da0SRusty Russell help 489aab46da0SRusty Russell Use dynamic allocation for cpumask_var_t, instead of putting 490aab46da0SRusty Russell them on the stack. This is a bit more expensive, but avoids 491aab46da0SRusty Russell stack overflow. 492aab46da0SRusty Russell 493c39649c3SBen Hutchingsconfig CPU_RMAP 494c39649c3SBen Hutchings bool 495c39649c3SBen Hutchings depends on SMP 496c39649c3SBen Hutchings 49775957ba3STom Herbertconfig DQL 49875957ba3STom Herbert bool 49975957ba3STom Herbert 500b0125085SGeorge Spelvinconfig GLOB 501b0125085SGeorge Spelvin bool 502b0125085SGeorge Spelvin# This actually supports modular compilation, but the module overhead 503b0125085SGeorge Spelvin# is ridiculous for the amount of code involved. Until an out-of-tree 504b0125085SGeorge Spelvin# driver asks for it, we'll just link it directly it into the kernel 505b0125085SGeorge Spelvin# when required. Since we're ignoring out-of-tree users, there's also 506b0125085SGeorge Spelvin# no need bother prompting for a manual decision: 507b0125085SGeorge Spelvin# prompt "glob_match() function" 508b0125085SGeorge Spelvin help 509b0125085SGeorge Spelvin This option provides a glob_match function for performing 510b0125085SGeorge Spelvin simple text pattern matching. It originated in the ATA code 511b0125085SGeorge Spelvin to blacklist particular drive models, but other device drivers 512b0125085SGeorge Spelvin may need similar functionality. 513b0125085SGeorge Spelvin 514b0125085SGeorge Spelvin All drivers in the Linux kernel tree that require this function 515b0125085SGeorge Spelvin should automatically select this option. Say N unless you 516b0125085SGeorge Spelvin are compiling an out-of tree driver which tells you that it 517b0125085SGeorge Spelvin depends on this. 518b0125085SGeorge Spelvin 5195f9be824SGeorge Spelvinconfig GLOB_SELFTEST 520ba95b045SGeert Uytterhoeven tristate "glob self-test on init" 5215f9be824SGeorge Spelvin depends on GLOB 5225f9be824SGeorge Spelvin help 5235f9be824SGeorge Spelvin This option enables a simple self-test of the glob_match 5245f9be824SGeorge Spelvin function on startup. It is primarily useful for people 5255f9be824SGeorge Spelvin working on the code to ensure they haven't introduced any 5265f9be824SGeorge Spelvin regressions. 5275f9be824SGeorge Spelvin 5285f9be824SGeorge Spelvin It only adds a little bit of code and slows kernel boot (or 5295f9be824SGeorge Spelvin module load) by a small amount, so you're welcome to play with 5305f9be824SGeorge Spelvin it, but you probably don't need it. 5315f9be824SGeorge Spelvin 532e9cc8bddSGeert Uytterhoeven# 533e9cc8bddSGeert Uytterhoeven# Netlink attribute parsing support is select'ed if needed 534e9cc8bddSGeert Uytterhoeven# 535e9cc8bddSGeert Uytterhoevenconfig NLATTR 536e9cc8bddSGeert Uytterhoeven bool 537e9cc8bddSGeert Uytterhoeven 53809d4e0edSPaul Mackerras# 53909d4e0edSPaul Mackerras# Generic 64-bit atomic support is selected if needed 54009d4e0edSPaul Mackerras# 54109d4e0edSPaul Mackerrasconfig GENERIC_ATOMIC64 54209d4e0edSPaul Mackerras bool 54309d4e0edSPaul Mackerras 544b411b363SPhilipp Reisnerconfig LRU_CACHE 545b411b363SPhilipp Reisner tristate 546b411b363SPhilipp Reisner 547c6df4b17SDavid Millerconfig CLZ_TAB 548c6df4b17SDavid Miller bool 549c6df4b17SDavid Miller 550511cbce2SChristoph Hellwigconfig IRQ_POLL 551511cbce2SChristoph Hellwig bool "IRQ polling library" 552511cbce2SChristoph Hellwig help 553511cbce2SChristoph Hellwig Helper library to poll interrupt mitigation using polling. 554511cbce2SChristoph Hellwig 555d9c46b18SDmitry Kasatkinconfig MPILIB 5562e5f094bSDmitry Kasatkin tristate 557c6df4b17SDavid Miller select CLZ_TAB 558d9c46b18SDmitry Kasatkin help 559d9c46b18SDmitry Kasatkin Multiprecision maths library from GnuPG. 560d9c46b18SDmitry Kasatkin It is used to implement RSA digital signature verification, 561d9c46b18SDmitry Kasatkin which is used by IMA/EVM digital signature extension. 562d9c46b18SDmitry Kasatkin 5635e8898e9SDmitry Kasatkinconfig SIGNATURE 5642e5f094bSDmitry Kasatkin tristate 5650d1f64f6SDmitry Kasatkin depends on KEYS 5660d1f64f6SDmitry Kasatkin select CRYPTO 567be440ec7SDmitry Kasatkin select CRYPTO_SHA1 568051dbb91SDmitry Kasatkin select MPILIB 569051dbb91SDmitry Kasatkin help 570051dbb91SDmitry Kasatkin Digital signature verification. Currently only RSA is supported. 571051dbb91SDmitry Kasatkin Implementation is done using GnuPG MPI library 572051dbb91SDmitry Kasatkin 5734f75da36STal Gilboaconfig DIMLIB 574424adc32SUwe Kleine-König bool 5754f75da36STal Gilboa help 5764f75da36STal Gilboa Dynamic Interrupt Moderation library. 577991ad2b2SRandy Dunlap Implements an algorithm for dynamically changing CQ moderation values 5784f75da36STal Gilboa according to run time performance. 5794f75da36STal Gilboa 580ab253839SDavid Daney# 581ab253839SDavid Daney# libfdt files, only selected if needed. 582ab253839SDavid Daney# 583ab253839SDavid Daneyconfig LIBFDT 584ab253839SDavid Daney bool 585ab253839SDavid Daney 586a77ad6eaSDavid Howellsconfig OID_REGISTRY 587a77ad6eaSDavid Howells tristate 588a77ad6eaSDavid Howells help 589a77ad6eaSDavid Howells Enable fast lookup object identifier registry. 590a77ad6eaSDavid Howells 5910635eb8aSMatthew Garrettconfig UCS2_STRING 5920635eb8aSMatthew Garrett tristate 5930635eb8aSMatthew Garrett 59400b26474SVincenzo Frascino# 59500b26474SVincenzo Frascino# generic vdso 59600b26474SVincenzo Frascino# 59700b26474SVincenzo Frascinosource "lib/vdso/Kconfig" 59800b26474SVincenzo Frascino 599ee89bd6bSGeert Uytterhoevensource "lib/fonts/Kconfig" 600ee89bd6bSGeert Uytterhoeven 601f8bcbe62SRobert Jarzmikconfig SG_SPLIT 602f8bcbe62SRobert Jarzmik def_bool n 603f8bcbe62SRobert Jarzmik help 6047f7e92f7SGeert Uytterhoeven Provides a helper to split scatterlists into chunks, each chunk being 6057f7e92f7SGeert Uytterhoeven a scatterlist. This should be selected by a driver or an API which 6067f7e92f7SGeert Uytterhoeven whishes to split a scatterlist amongst multiple DMA channels. 607f8bcbe62SRobert Jarzmik 6089b1d6c89SMing Linconfig SG_POOL 6099b1d6c89SMing Lin def_bool n 6109b1d6c89SMing Lin help 6119b1d6c89SMing Lin Provides a helper to allocate chained scatterlists. This should be 6129b1d6c89SMing Lin selected by a driver or an API which whishes to allocate chained 6139b1d6c89SMing Lin scatterlist. 6149b1d6c89SMing Lin 615308c09f1SLaura Abbott# 616308c09f1SLaura Abbott# sg chaining option 617308c09f1SLaura Abbott# 618308c09f1SLaura Abbott 6197c703e54SChristoph Hellwigconfig ARCH_NO_SG_CHAIN 620308c09f1SLaura Abbott def_bool n 621308c09f1SLaura Abbott 62261031952SRoss Zwislerconfig ARCH_HAS_PMEM_API 62361031952SRoss Zwisler bool 62461031952SRoss Zwisler 62533dd7075SDan Williamsconfig MEMREGION 62633dd7075SDan Williams bool 62733dd7075SDan Williams 6289ffc1d19SDan Williamsconfig ARCH_HAS_MEMREMAP_COMPAT_ALIGN 6299ffc1d19SDan Williams bool 6309ffc1d19SDan Williams 631bd79f947SChristoph Hellwig# use memcpy to implement user copies for nommu architectures 632bd79f947SChristoph Hellwigconfig UACCESS_MEMCPY 633bd79f947SChristoph Hellwig bool 634bd79f947SChristoph Hellwig 6350aed55afSDan Williamsconfig ARCH_HAS_UACCESS_FLUSHCACHE 6360aed55afSDan Williams bool 6370aed55afSDan Williams 638*ec6347bbSDan Williams# arch has a concept of a recoverable synchronous exception due to a 639*ec6347bbSDan Williams# memory-read error like x86 machine-check or ARM data-abort, and 640*ec6347bbSDan Williams# implements copy_mc_to_{user,kernel} to abort and report 641*ec6347bbSDan Williams# 'bytes-transferred' if that exception fires when accessing the source 642*ec6347bbSDan Williams# buffer. 643*ec6347bbSDan Williamsconfig ARCH_HAS_COPY_MC 644522239b4SDan Williams bool 645522239b4SDan Williams 646214d8ca6SThomas Gleixner# Temporary. Goes away when all archs are cleaned up 647214d8ca6SThomas Gleixnerconfig ARCH_STACKWALK 648214d8ca6SThomas Gleixner bool 649214d8ca6SThomas Gleixner 650cd11016eSAlexander Potapenkoconfig STACKDEPOT 651cd11016eSAlexander Potapenko bool 652cd11016eSAlexander Potapenko select STACKTRACE 653cd11016eSAlexander Potapenko 65488459642SOmar Sandovalconfig SBITMAP 65588459642SOmar Sandoval bool 65688459642SOmar Sandoval 65744091d29SJiri Pirkoconfig PARMAN 6589d25af69SGeert Uytterhoeven tristate "parman" if COMPILE_TEST 65944091d29SJiri Pirko 6603dfdecc6SRandy Dunlapconfig OBJAGG 6613dfdecc6SRandy Dunlap tristate "objagg" if COMPILE_TEST 6623dfdecc6SRandy Dunlap 66303270c13SMatthew Wilcoxconfig STRING_SELFTEST 664d6b28e09SGeert Uytterhoeven tristate "Test string functions" 66503270c13SMatthew Wilcox 6662de4ff7bSThomas Grafendmenu 667b35cd988SPalmer Dabbelt 66880b0ca98SChristoph Hellwigconfig GENERIC_IOREMAP 66980b0ca98SChristoph Hellwig bool 67080b0ca98SChristoph Hellwig 671e3d59805SMatt Redfearnconfig GENERIC_LIB_ASHLDI3 672b35cd988SPalmer Dabbelt bool 673b35cd988SPalmer Dabbelt 674e3d59805SMatt Redfearnconfig GENERIC_LIB_ASHRDI3 675b35cd988SPalmer Dabbelt bool 676b35cd988SPalmer Dabbelt 677e3d59805SMatt Redfearnconfig GENERIC_LIB_LSHRDI3 678b35cd988SPalmer Dabbelt bool 679b35cd988SPalmer Dabbelt 680e3d59805SMatt Redfearnconfig GENERIC_LIB_MULDI3 681b35cd988SPalmer Dabbelt bool 682b35cd988SPalmer Dabbelt 683e3d59805SMatt Redfearnconfig GENERIC_LIB_CMPDI2 684b35cd988SPalmer Dabbelt bool 685b35cd988SPalmer Dabbelt 686e3d59805SMatt Redfearnconfig GENERIC_LIB_UCMPDI2 687b35cd988SPalmer Dabbelt bool 688b8265621SJacob Keller 689b8265621SJacob Kellerconfig PLDMFW 690b8265621SJacob Keller bool 691b8265621SJacob Keller default n 692