lib/Kconfig

   1 #
   2 # Library configuration
   3 #
   4
   5 config BINARY_PRINTF
   6         def_bool n
   7
   8 menu "Library routines"
   9
  10 config RAID6_PQ
  11         tristate
  12
  13 config BITREVERSE
  14         tristate
  15
  16 config HAVE_ARCH_BITREVERSE
  17         bool
  18         default n
  19         depends on BITREVERSE
  20         help
  21           This option enables the use of hardware bit-reversal instructions on
  22           architectures which support such operations.
  23
  24 config RATIONAL
  25         bool
  26
  27 config GENERIC_STRNCPY_FROM_USER
  28         bool
  29
  30 config GENERIC_STRNLEN_USER
  31         bool
  32
  33 config GENERIC_NET_UTILS
  34         bool
  35
  36 config GENERIC_FIND_FIRST_BIT
  37         bool
  38
  39 config NO_GENERIC_PCI_IOPORT_MAP
  40         bool
  41
  42 config GENERIC_PCI_IOMAP
  43         bool
  44
  45 config GENERIC_IOMAP
  46         bool
  47         select GENERIC_PCI_IOMAP
  48
  49 config GENERIC_IO
  50         bool
  51         default n
  52
  53 config STMP_DEVICE
  54         bool
  55
  56 config ARCH_USE_CMPXCHG_LOCKREF
  57         bool
  58
  59 config ARCH_HAS_FAST_MULTIPLIER
  60         bool
  61
  62 config CRC_CCITT
  63         tristate "CRC-CCITT functions"
  64         help
  65           This option is provided for the case where no in-kernel-tree
  66           modules require CRC-CCITT functions, but a module built outside
  67           the kernel tree does. Such modules that use library CRC-CCITT
  68           functions require M here.
  69
  70 config CRC16
  71         tristate "CRC16 functions"
  72         help
  73           This option is provided for the case where no in-kernel-tree
  74           modules require CRC16 functions, but a module built outside
  75           the kernel tree does. Such modules that use library CRC16
  76           functions require M here.
  77
  78 config CRC_T10DIF
  79         tristate "CRC calculation for the T10 Data Integrity Field"
  80         select CRYPTO
  81         select CRYPTO_CRCT10DIF
  82         help
  83           This option is only needed if a module that's not in the
  84           kernel tree needs to calculate CRC checks for use with the
  85           SCSI data integrity subsystem.
  86
  87 config CRC_ITU_T
  88         tristate "CRC ITU-T V.41 functions"
  89         help
  90           This option is provided for the case where no in-kernel-tree
  91           modules require CRC ITU-T V.41 functions, but a module built outside
  92           the kernel tree does. Such modules that use library CRC ITU-T V.41
  93           functions require M here.
  94
  95 config CRC32
  96         tristate "CRC32/CRC32c functions"
  97         default y
  98         select BITREVERSE
  99         help
 100           This option is provided for the case where no in-kernel-tree
 101           modules require CRC32/CRC32c functions, but a module built outside
 102           the kernel tree does. Such modules that use library CRC32/CRC32c
 103           functions require M here.
 104
 105 config CRC32_SELFTEST
 106         tristate "CRC32 perform self test on init"
 107         depends on CRC32
 108         help
 109           This option enables the CRC32 library functions to perform a
 110           self test on initialization. The self test computes crc32_le
 111           and crc32_be over byte strings with random alignment and length
 112           and computes the total elapsed time and number of bytes processed.
 113
 114 choice
 115         prompt "CRC32 implementation"
 116         depends on CRC32
 117         default CRC32_SLICEBY8
 118         help
 119           This option allows a kernel builder to override the default choice
 120           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
 121           know that you need one of the others.
 122
 123 config CRC32_SLICEBY8
 124         bool "Slice by 8 bytes"
 125         help
 126           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 127           This is the fastest algorithm, but comes with a 8KiB lookup table.
 128           Most modern processors have enough cache to hold this table without
 129           thrashing the cache.
 130
 131           This is the default implementation choice.  Choose this one unless
 132           you have a good reason not to.
 133
 134 config CRC32_SLICEBY4
 135         bool "Slice by 4 bytes"
 136         help
 137           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 138           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 139           table.
 140
 141           Only choose this option if you know what you are doing.
 142
 143 config CRC32_SARWATE
 144         bool "Sarwate's Algorithm (one byte at a time)"
 145         help
 146           Calculate checksum a byte at a time using Sarwate's algorithm.  This
 147           is not particularly fast, but has a small 256 byte lookup table.
 148
 149           Only choose this option if you know what you are doing.
 150
 151 config CRC32_BIT
 152         bool "Classic Algorithm (one bit at a time)"
 153         help
 154           Calculate checksum one bit at a time.  This is VERY slow, but has
 155           no lookup table.  This is provided as a debugging option.
 156
 157           Only choose this option if you are debugging crc32.
 158
 159 endchoice
 160
 161 config CRC4
 162         tristate "CRC4 functions"
 163         help
 164           This option is provided for the case where no in-kernel-tree
 165           modules require CRC4 functions, but a module built outside
 166           the kernel tree does. Such modules that use library CRC4
 167           functions require M here.
 168
 169 config CRC7
 170         tristate "CRC7 functions"
 171         help
 172           This option is provided for the case where no in-kernel-tree
 173           modules require CRC7 functions, but a module built outside
 174           the kernel tree does. Such modules that use library CRC7
 175           functions require M here.
 176
 177 config LIBCRC32C
 178         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 179         select CRYPTO
 180         select CRYPTO_CRC32C
 181         help
 182           This option is provided for the case where no in-kernel-tree
 183           modules require CRC32c functions, but a module built outside the
 184           kernel tree does. Such modules that use library CRC32c functions
 185           require M here.  See Castagnoli93.
 186           Module will be libcrc32c.
 187
 188 config CRC8
 189         tristate "CRC8 function"
 190         help
 191           This option provides CRC8 function. Drivers may select this
 192           when they need to do cyclic redundancy check according CRC8
 193           algorithm. Module will be called crc8.
 194
 195 config XXHASH
 196         tristate
 197
 198 config AUDIT_GENERIC
 199         bool
 200         depends on AUDIT && !AUDIT_ARCH
 201         default y
 202
 203 config AUDIT_ARCH_COMPAT_GENERIC
 204         bool
 205         default n
 206
 207 config AUDIT_COMPAT_GENERIC
 208         bool
 209         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
 210         default y
 211
 212 config RANDOM32_SELFTEST
 213         bool "PRNG perform self test on init"
 214         default n
 215         help
 216           This option enables the 32 bit PRNG library functions to perform a
 217           self test on initialization.
 218
 219 #
 220 # compression support is select'ed if needed
 221 #
 222 config 842_COMPRESS
 223         select CRC32
 224         tristate
 225
 226 config 842_DECOMPRESS
 227         select CRC32
 228         tristate
 229
 230 config ZLIB_INFLATE
 231         tristate
 232
 233 config ZLIB_DEFLATE
 234         tristate
 235         select BITREVERSE
 236
 237 config LZO_COMPRESS
 238         tristate
 239
 240 config LZO_DECOMPRESS
 241         tristate
 242
 243 config LZ4_COMPRESS
 244         tristate
 245
 246 config LZ4HC_COMPRESS
 247         tristate
 248
 249 config LZ4_DECOMPRESS
 250         tristate
 251
 252 config ZSTD_COMPRESS
 253         select XXHASH
 254         tristate
 255
 256 config ZSTD_DECOMPRESS
 257         select XXHASH
 258         tristate
 259
 260 source "lib/xz/Kconfig"
 261
 262 #
 263 # These all provide a common interface (hence the apparent duplication with
 264 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 265 #
 266 config DECOMPRESS_GZIP
 267         select ZLIB_INFLATE
 268         tristate
 269
 270 config DECOMPRESS_BZIP2
 271         tristate
 272
 273 config DECOMPRESS_LZMA
 274         tristate
 275
 276 config DECOMPRESS_XZ
 277         select XZ_DEC
 278         tristate
 279
 280 config DECOMPRESS_LZO
 281         select LZO_DECOMPRESS
 282         tristate
 283
 284 config DECOMPRESS_LZ4
 285         select LZ4_DECOMPRESS
 286         tristate
 287
 288 #
 289 # Generic allocator support is selected if needed
 290 #
 291 config GENERIC_ALLOCATOR
 292         bool
 293
 294 #
 295 # reed solomon support is select'ed if needed
 296 #
 297 config REED_SOLOMON
 298         tristate
 299
 300 config REED_SOLOMON_ENC8
 301         bool
 302
 303 config REED_SOLOMON_DEC8
 304         bool
 305
 306 config REED_SOLOMON_ENC16
 307         bool
 308
 309 config REED_SOLOMON_DEC16
 310         bool
 311
 312 #
 313 # BCH support is selected if needed
 314 #
 315 config BCH
 316         tristate
 317
 318 config BCH_CONST_PARAMS
 319         bool
 320         help
 321           Drivers may select this option to force specific constant
 322           values for parameters 'm' (Galois field order) and 't'
 323           (error correction capability). Those specific values must
 324           be set by declaring default values for symbols BCH_CONST_M
 325           and BCH_CONST_T.
 326           Doing so will enable extra compiler optimizations,
 327           improving encoding and decoding performance up to 2x for
 328           usual (m,t) values (typically such that m*t < 200).
 329           When this option is selected, the BCH library supports
 330           only a single (m,t) configuration. This is mainly useful
 331           for NAND flash board drivers requiring known, fixed BCH
 332           parameters.
 333
 334 config BCH_CONST_M
 335         int
 336         range 5 15
 337         help
 338           Constant value for Galois field order 'm'. If 'k' is the
 339           number of data bits to protect, 'm' should be chosen such
 340           that (k + m*t) <= 2**m - 1.
 341           Drivers should declare a default value for this symbol if
 342           they select option BCH_CONST_PARAMS.
 343
 344 config BCH_CONST_T
 345         int
 346         help
 347           Constant value for error correction capability in bits 't'.
 348           Drivers should declare a default value for this symbol if
 349           they select option BCH_CONST_PARAMS.
 350
 351 #
 352 # Textsearch support is select'ed if needed
 353 #
 354 config TEXTSEARCH
 355         bool
 356
 357 config TEXTSEARCH_KMP
 358         tristate
 359
 360 config TEXTSEARCH_BM
 361         tristate
 362
 363 config TEXTSEARCH_FSM
 364         tristate
 365
 366 config BTREE
 367         bool
 368
 369 config INTERVAL_TREE
 370         bool
 371         help
 372           Simple, embeddable, interval-tree. Can find the start of an
 373           overlapping range in log(n) time and then iterate over all
 374           overlapping nodes. The algorithm is implemented as an
 375           augmented rbtree.
 376
 377           See:
 378
 379                 Documentation/rbtree.txt
 380
 381           for more information.
 382
 383 config RADIX_TREE_MULTIORDER
 384         bool
 385
 386 config ASSOCIATIVE_ARRAY
 387         bool
 388         help
 389           Generic associative array.  Can be searched and iterated over whilst
 390           it is being modified.  It is also reasonably quick to search and
 391           modify.  The algorithms are non-recursive, and the trees are highly
 392           capacious.
 393
 394           See:
 395
 396                 Documentation/assoc_array.txt
 397
 398           for more information.
 399
 400 config HAS_IOMEM
 401         bool
 402         depends on !NO_IOMEM
 403         select GENERIC_IO
 404         default y
 405
 406 config HAS_IOPORT_MAP
 407         bool
 408         depends on HAS_IOMEM && !NO_IOPORT_MAP
 409         default y
 410
 411 config HAS_DMA
 412         bool
 413         depends on !NO_DMA
 414         default y
 415
 416 config DMA_NOOP_OPS
 417         bool
 418         depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
 419         default n
 420
 421 config DMA_VIRT_OPS
 422         bool
 423         depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
 424         default n
 425
 426 config CHECK_SIGNATURE
 427         bool
 428
 429 config CPUMASK_OFFSTACK
 430         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 431         help
 432           Use dynamic allocation for cpumask_var_t, instead of putting
 433           them on the stack.  This is a bit more expensive, but avoids
 434           stack overflow.
 435
 436 config CPU_RMAP
 437         bool
 438         depends on SMP
 439
 440 config DQL
 441         bool
 442
 443 config GLOB
 444         bool
 445 #       This actually supports modular compilation, but the module overhead
 446 #       is ridiculous for the amount of code involved.  Until an out-of-tree
 447 #       driver asks for it, we'll just link it directly it into the kernel
 448 #       when required.  Since we're ignoring out-of-tree users, there's also
 449 #       no need bother prompting for a manual decision:
 450 #       prompt "glob_match() function"
 451         help
 452           This option provides a glob_match function for performing
 453           simple text pattern matching.  It originated in the ATA code
 454           to blacklist particular drive models, but other device drivers
 455           may need similar functionality.
 456
 457           All drivers in the Linux kernel tree that require this function
 458           should automatically select this option.  Say N unless you
 459           are compiling an out-of tree driver which tells you that it
 460           depends on this.
 461
 462 config GLOB_SELFTEST
 463         tristate "glob self-test on init"
 464         depends on GLOB
 465         help
 466           This option enables a simple self-test of the glob_match
 467           function on startup.  It is primarily useful for people
 468           working on the code to ensure they haven't introduced any
 469           regressions.
 470
 471           It only adds a little bit of code and slows kernel boot (or
 472           module load) by a small amount, so you're welcome to play with
 473           it, but you probably don't need it.
 474
 475 #
 476 # Netlink attribute parsing support is select'ed if needed
 477 #
 478 config NLATTR
 479         bool
 480
 481 #
 482 # Generic 64-bit atomic support is selected if needed
 483 #
 484 config GENERIC_ATOMIC64
 485        bool
 486
 487 config LRU_CACHE
 488         tristate
 489
 490 config CLZ_TAB
 491         bool
 492
 493 config CORDIC
 494         tristate "CORDIC algorithm"
 495         help
 496           This option provides an implementation of the CORDIC algorithm;
 497           calculations are in fixed point. Module will be called cordic.
 498
 499 config DDR
 500         bool "JEDEC DDR data"
 501         help
 502           Data from JEDEC specs for DDR SDRAM memories,
 503           particularly the AC timing parameters and addressing
 504           information. This data is useful for drivers handling
 505           DDR SDRAM controllers.
 506
 507 config IRQ_POLL
 508         bool "IRQ polling library"
 509         help
 510           Helper library to poll interrupt mitigation using polling.
 511
 512 config MPILIB
 513         tristate
 514         select CLZ_TAB
 515         help
 516           Multiprecision maths library from GnuPG.
 517           It is used to implement RSA digital signature verification,
 518           which is used by IMA/EVM digital signature extension.
 519
 520 config SIGNATURE
 521         tristate
 522         depends on KEYS
 523         select CRYPTO
 524         select CRYPTO_SHA1
 525         select MPILIB
 526         help
 527           Digital signature verification. Currently only RSA is supported.
 528           Implementation is done using GnuPG MPI library
 529
 530 #
 531 # libfdt files, only selected if needed.
 532 #
 533 config LIBFDT
 534         bool
 535
 536 config OID_REGISTRY
 537         tristate
 538         help
 539           Enable fast lookup object identifier registry.
 540
 541 config UCS2_STRING
 542         tristate
 543
 544 source "lib/fonts/Kconfig"
 545
 546 config SG_SPLIT
 547         def_bool n
 548         help
 549          Provides a helper to split scatterlists into chunks, each chunk being
 550          a scatterlist. This should be selected by a driver or an API which
 551          whishes to split a scatterlist amongst multiple DMA channels.
 552
 553 config SG_POOL
 554         def_bool n
 555         help
 556          Provides a helper to allocate chained scatterlists. This should be
 557          selected by a driver or an API which whishes to allocate chained
 558          scatterlist.
 559
 560 #
 561 # sg chaining option
 562 #
 563
 564 config ARCH_HAS_SG_CHAIN
 565         def_bool n
 566
 567 config ARCH_HAS_PMEM_API
 568         bool
 569
 570 config ARCH_HAS_UACCESS_FLUSHCACHE
 571         bool
 572
 573 config STACKDEPOT
 574         bool
 575         select STACKTRACE
 576
 577 config SBITMAP
 578         bool
 579
 580 config PARMAN
 581         tristate "parman" if COMPILE_TEST
 582
 583 config PRIME_NUMBERS
 584         tristate
 585
 586 config STRING_SELFTEST
 587         bool "Test string functions"
 588
 589 endmenu