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 AUDIT_GENERIC
 196         bool
 197         depends on AUDIT && !AUDIT_ARCH
 198         default y
 199
 200 config AUDIT_ARCH_COMPAT_GENERIC
 201         bool
 202         default n
 203
 204 config AUDIT_COMPAT_GENERIC
 205         bool
 206         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
 207         default y
 208
 209 config RANDOM32_SELFTEST
 210         bool "PRNG perform self test on init"
 211         default n
 212         help
 213           This option enables the 32 bit PRNG library functions to perform a
 214           self test on initialization.
 215
 216 #
 217 # compression support is select'ed if needed
 218 #
 219 config 842_COMPRESS
 220         select CRC32
 221         tristate
 222
 223 config 842_DECOMPRESS
 224         select CRC32
 225         tristate
 226
 227 config ZLIB_INFLATE
 228         tristate
 229
 230 config ZLIB_DEFLATE
 231         tristate
 232         select BITREVERSE
 233
 234 config LZO_COMPRESS
 235         tristate
 236
 237 config LZO_DECOMPRESS
 238         tristate
 239
 240 config LZ4_COMPRESS
 241         tristate
 242
 243 config LZ4HC_COMPRESS
 244         tristate
 245
 246 config LZ4_DECOMPRESS
 247         tristate
 248
 249 source "lib/xz/Kconfig"
 250
 251 #
 252 # These all provide a common interface (hence the apparent duplication with
 253 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 254 #
 255 config DECOMPRESS_GZIP
 256         select ZLIB_INFLATE
 257         tristate
 258
 259 config DECOMPRESS_BZIP2
 260         tristate
 261
 262 config DECOMPRESS_LZMA
 263         tristate
 264
 265 config DECOMPRESS_XZ
 266         select XZ_DEC
 267         tristate
 268
 269 config DECOMPRESS_LZO
 270         select LZO_DECOMPRESS
 271         tristate
 272
 273 config DECOMPRESS_LZ4
 274         select LZ4_DECOMPRESS
 275         tristate
 276
 277 #
 278 # Generic allocator support is selected if needed
 279 #
 280 config GENERIC_ALLOCATOR
 281         bool
 282
 283 #
 284 # reed solomon support is select'ed if needed
 285 #
 286 config REED_SOLOMON
 287         tristate
 288
 289 config REED_SOLOMON_ENC8
 290         bool
 291
 292 config REED_SOLOMON_DEC8
 293         bool
 294
 295 config REED_SOLOMON_ENC16
 296         bool
 297
 298 config REED_SOLOMON_DEC16
 299         bool
 300
 301 #
 302 # BCH support is selected if needed
 303 #
 304 config BCH
 305         tristate
 306
 307 config BCH_CONST_PARAMS
 308         bool
 309         help
 310           Drivers may select this option to force specific constant
 311           values for parameters 'm' (Galois field order) and 't'
 312           (error correction capability). Those specific values must
 313           be set by declaring default values for symbols BCH_CONST_M
 314           and BCH_CONST_T.
 315           Doing so will enable extra compiler optimizations,
 316           improving encoding and decoding performance up to 2x for
 317           usual (m,t) values (typically such that m*t < 200).
 318           When this option is selected, the BCH library supports
 319           only a single (m,t) configuration. This is mainly useful
 320           for NAND flash board drivers requiring known, fixed BCH
 321           parameters.
 322
 323 config BCH_CONST_M
 324         int
 325         range 5 15
 326         help
 327           Constant value for Galois field order 'm'. If 'k' is the
 328           number of data bits to protect, 'm' should be chosen such
 329           that (k + m*t) <= 2**m - 1.
 330           Drivers should declare a default value for this symbol if
 331           they select option BCH_CONST_PARAMS.
 332
 333 config BCH_CONST_T
 334         int
 335         help
 336           Constant value for error correction capability in bits 't'.
 337           Drivers should declare a default value for this symbol if
 338           they select option BCH_CONST_PARAMS.
 339
 340 #
 341 # Textsearch support is select'ed if needed
 342 #
 343 config TEXTSEARCH
 344         bool
 345
 346 config TEXTSEARCH_KMP
 347         tristate
 348
 349 config TEXTSEARCH_BM
 350         tristate
 351
 352 config TEXTSEARCH_FSM
 353         tristate
 354
 355 config BTREE
 356         bool
 357
 358 config INTERVAL_TREE
 359         bool
 360         help
 361           Simple, embeddable, interval-tree. Can find the start of an
 362           overlapping range in log(n) time and then iterate over all
 363           overlapping nodes. The algorithm is implemented as an
 364           augmented rbtree.
 365
 366           See:
 367
 368                 Documentation/rbtree.txt
 369
 370           for more information.
 371
 372 config RADIX_TREE_MULTIORDER
 373         bool
 374
 375 config ASSOCIATIVE_ARRAY
 376         bool
 377         help
 378           Generic associative array.  Can be searched and iterated over whilst
 379           it is being modified.  It is also reasonably quick to search and
 380           modify.  The algorithms are non-recursive, and the trees are highly
 381           capacious.
 382
 383           See:
 384
 385                 Documentation/assoc_array.txt
 386
 387           for more information.
 388
 389 config HAS_IOMEM
 390         bool
 391         depends on !NO_IOMEM
 392         select GENERIC_IO
 393         default y
 394
 395 config HAS_IOPORT_MAP
 396         bool
 397         depends on HAS_IOMEM && !NO_IOPORT_MAP
 398         default y
 399
 400 config HAS_DMA
 401         bool
 402         depends on !NO_DMA
 403         default y
 404
 405 config DMA_NOOP_OPS
 406         bool
 407         depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
 408         default n
 409
 410 config DMA_VIRT_OPS
 411         bool
 412         depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
 413         default n
 414
 415 config CHECK_SIGNATURE
 416         bool
 417
 418 config CPUMASK_OFFSTACK
 419         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 420         help
 421           Use dynamic allocation for cpumask_var_t, instead of putting
 422           them on the stack.  This is a bit more expensive, but avoids
 423           stack overflow.
 424
 425 config CPU_RMAP
 426         bool
 427         depends on SMP
 428
 429 config DQL
 430         bool
 431
 432 config GLOB
 433         bool
 434 #       This actually supports modular compilation, but the module overhead
 435 #       is ridiculous for the amount of code involved.  Until an out-of-tree
 436 #       driver asks for it, we'll just link it directly it into the kernel
 437 #       when required.  Since we're ignoring out-of-tree users, there's also
 438 #       no need bother prompting for a manual decision:
 439 #       prompt "glob_match() function"
 440         help
 441           This option provides a glob_match function for performing
 442           simple text pattern matching.  It originated in the ATA code
 443           to blacklist particular drive models, but other device drivers
 444           may need similar functionality.
 445
 446           All drivers in the Linux kernel tree that require this function
 447           should automatically select this option.  Say N unless you
 448           are compiling an out-of tree driver which tells you that it
 449           depends on this.
 450
 451 config GLOB_SELFTEST
 452         tristate "glob self-test on init"
 453         depends on GLOB
 454         help
 455           This option enables a simple self-test of the glob_match
 456           function on startup.  It is primarily useful for people
 457           working on the code to ensure they haven't introduced any
 458           regressions.
 459
 460           It only adds a little bit of code and slows kernel boot (or
 461           module load) by a small amount, so you're welcome to play with
 462           it, but you probably don't need it.
 463
 464 #
 465 # Netlink attribute parsing support is select'ed if needed
 466 #
 467 config NLATTR
 468         bool
 469
 470 #
 471 # Generic 64-bit atomic support is selected if needed
 472 #
 473 config GENERIC_ATOMIC64
 474        bool
 475
 476 config LRU_CACHE
 477         tristate
 478
 479 config CLZ_TAB
 480         bool
 481
 482 config CORDIC
 483         tristate "CORDIC algorithm"
 484         help
 485           This option provides an implementation of the CORDIC algorithm;
 486           calculations are in fixed point. Module will be called cordic.
 487
 488 config DDR
 489         bool "JEDEC DDR data"
 490         help
 491           Data from JEDEC specs for DDR SDRAM memories,
 492           particularly the AC timing parameters and addressing
 493           information. This data is useful for drivers handling
 494           DDR SDRAM controllers.
 495
 496 config IRQ_POLL
 497         bool "IRQ polling library"
 498         help
 499           Helper library to poll interrupt mitigation using polling.
 500
 501 config MPILIB
 502         tristate
 503         select CLZ_TAB
 504         help
 505           Multiprecision maths library from GnuPG.
 506           It is used to implement RSA digital signature verification,
 507           which is used by IMA/EVM digital signature extension.
 508
 509 config SIGNATURE
 510         tristate
 511         depends on KEYS
 512         select CRYPTO
 513         select CRYPTO_SHA1
 514         select MPILIB
 515         help
 516           Digital signature verification. Currently only RSA is supported.
 517           Implementation is done using GnuPG MPI library
 518
 519 #
 520 # libfdt files, only selected if needed.
 521 #
 522 config LIBFDT
 523         bool
 524
 525 config OID_REGISTRY
 526         tristate
 527         help
 528           Enable fast lookup object identifier registry.
 529
 530 config UCS2_STRING
 531         tristate
 532
 533 source "lib/fonts/Kconfig"
 534
 535 config SG_SPLIT
 536         def_bool n
 537         help
 538          Provides a helper to split scatterlists into chunks, each chunk being
 539          a scatterlist. This should be selected by a driver or an API which
 540          whishes to split a scatterlist amongst multiple DMA channels.
 541
 542 config SG_POOL
 543         def_bool n
 544         help
 545          Provides a helper to allocate chained scatterlists. This should be
 546          selected by a driver or an API which whishes to allocate chained
 547          scatterlist.
 548
 549 #
 550 # sg chaining option
 551 #
 552
 553 config ARCH_HAS_SG_CHAIN
 554         def_bool n
 555
 556 config ARCH_HAS_PMEM_API
 557         bool
 558
 559 config ARCH_HAS_MMIO_FLUSH
 560         bool
 561
 562 config STACKDEPOT
 563         bool
 564         select STACKTRACE
 565
 566 config SBITMAP
 567         bool
 568
 569 config PARMAN
 570         tristate "parman" if COMPILE_TEST
 571
 572 config PRIME_NUMBERS
 573         tristate
 574
 575 endmenu