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         bool "CRC32 perform self test on init"
 107         default n
 108         depends on CRC32
 109         help
 110           This option enables the CRC32 library functions to perform a
 111           self test on initialization. The self test computes crc32_le
 112           and crc32_be over byte strings with random alignment and length
 113           and computes the total elapsed time and number of bytes processed.
 114
 115 choice
 116         prompt "CRC32 implementation"
 117         depends on CRC32
 118         default CRC32_SLICEBY8
 119         help
 120           This option allows a kernel builder to override the default choice
 121           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
 122           know that you need one of the others.
 123
 124 config CRC32_SLICEBY8
 125         bool "Slice by 8 bytes"
 126         help
 127           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 128           This is the fastest algorithm, but comes with a 8KiB lookup table.
 129           Most modern processors have enough cache to hold this table without
 130           thrashing the cache.
 131
 132           This is the default implementation choice.  Choose this one unless
 133           you have a good reason not to.
 134
 135 config CRC32_SLICEBY4
 136         bool "Slice by 4 bytes"
 137         help
 138           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 139           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 140           table.
 141
 142           Only choose this option if you know what you are doing.
 143
 144 config CRC32_SARWATE
 145         bool "Sarwate's Algorithm (one byte at a time)"
 146         help
 147           Calculate checksum a byte at a time using Sarwate's algorithm.  This
 148           is not particularly fast, but has a small 256 byte lookup table.
 149
 150           Only choose this option if you know what you are doing.
 151
 152 config CRC32_BIT
 153         bool "Classic Algorithm (one bit at a time)"
 154         help
 155           Calculate checksum one bit at a time.  This is VERY slow, but has
 156           no lookup table.  This is provided as a debugging option.
 157
 158           Only choose this option if you are debugging crc32.
 159
 160 endchoice
 161
 162 config CRC7
 163         tristate "CRC7 functions"
 164         help
 165           This option is provided for the case where no in-kernel-tree
 166           modules require CRC7 functions, but a module built outside
 167           the kernel tree does. Such modules that use library CRC7
 168           functions require M here.
 169
 170 config LIBCRC32C
 171         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 172         select CRYPTO
 173         select CRYPTO_CRC32C
 174         help
 175           This option is provided for the case where no in-kernel-tree
 176           modules require CRC32c functions, but a module built outside the
 177           kernel tree does. Such modules that use library CRC32c functions
 178           require M here.  See Castagnoli93.
 179           Module will be libcrc32c.
 180
 181 config CRC8
 182         tristate "CRC8 function"
 183         help
 184           This option provides CRC8 function. Drivers may select this
 185           when they need to do cyclic redundancy check according CRC8
 186           algorithm. Module will be called crc8.
 187
 188 config CRC64_ECMA
 189         tristate "CRC64 ECMA function"
 190         help
 191           This option provides CRC64 ECMA function. Drivers may select this
 192           when they need to do cyclic redundancy check according to the CRC64
 193           ECMA algorithm.
 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 CHECK_SIGNATURE
 406         bool
 407
 408 config CPUMASK_OFFSTACK
 409         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 410         help
 411           Use dynamic allocation for cpumask_var_t, instead of putting
 412           them on the stack.  This is a bit more expensive, but avoids
 413           stack overflow.
 414
 415 config CPU_RMAP
 416         bool
 417         depends on SMP
 418
 419 config DQL
 420         bool
 421
 422 config GLOB
 423         bool
 424 #       This actually supports modular compilation, but the module overhead
 425 #       is ridiculous for the amount of code involved.  Until an out-of-tree
 426 #       driver asks for it, we'll just link it directly it into the kernel
 427 #       when required.  Since we're ignoring out-of-tree users, there's also
 428 #       no need bother prompting for a manual decision:
 429 #       prompt "glob_match() function"
 430         help
 431           This option provides a glob_match function for performing
 432           simple text pattern matching.  It originated in the ATA code
 433           to blacklist particular drive models, but other device drivers
 434           may need similar functionality.
 435
 436           All drivers in the Linux kernel tree that require this function
 437           should automatically select this option.  Say N unless you
 438           are compiling an out-of tree driver which tells you that it
 439           depends on this.
 440
 441 config GLOB_SELFTEST
 442         bool "glob self-test on init"
 443         default n
 444         depends on GLOB
 445         help
 446           This option enables a simple self-test of the glob_match
 447           function on startup.  It is primarily useful for people
 448           working on the code to ensure they haven't introduced any
 449           regressions.
 450
 451           It only adds a little bit of code and slows kernel boot (or
 452           module load) by a small amount, so you're welcome to play with
 453           it, but you probably don't need it.
 454
 455 #
 456 # Netlink attribute parsing support is select'ed if needed
 457 #
 458 config NLATTR
 459         bool
 460
 461 #
 462 # Generic 64-bit atomic support is selected if needed
 463 #
 464 config GENERIC_ATOMIC64
 465        bool
 466
 467 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 468         def_bool y if GENERIC_ATOMIC64
 469
 470 config LRU_CACHE
 471         tristate
 472
 473 config CLZ_TAB
 474         bool
 475
 476 config CORDIC
 477         tristate "CORDIC algorithm"
 478         help
 479           This option provides an implementation of the CORDIC algorithm;
 480           calculations are in fixed point. Module will be called cordic.
 481
 482 config DDR
 483         bool "JEDEC DDR data"
 484         help
 485           Data from JEDEC specs for DDR SDRAM memories,
 486           particularly the AC timing parameters and addressing
 487           information. This data is useful for drivers handling
 488           DDR SDRAM controllers.
 489
 490 config IRQ_POLL
 491         bool "IRQ polling library"
 492         help
 493           Helper library to poll interrupt mitigation using polling.
 494
 495 config MPILIB
 496         tristate
 497         select CLZ_TAB
 498         help
 499           Multiprecision maths library from GnuPG.
 500           It is used to implement RSA digital signature verification,
 501           which is used by IMA/EVM digital signature extension.
 502
 503 config SIGNATURE
 504         tristate
 505         depends on KEYS
 506         select CRYPTO
 507         select CRYPTO_SHA1
 508         select MPILIB
 509         help
 510           Digital signature verification. Currently only RSA is supported.
 511           Implementation is done using GnuPG MPI library
 512
 513 #
 514 # libfdt files, only selected if needed.
 515 #
 516 config LIBFDT
 517         bool
 518
 519 config OID_REGISTRY
 520         tristate
 521         help
 522           Enable fast lookup object identifier registry.
 523
 524 config UCS2_STRING
 525         tristate
 526
 527 source "lib/fonts/Kconfig"
 528
 529 config SG_SPLIT
 530         def_bool n
 531         help
 532          Provides a helper to split scatterlists into chunks, each chunk being
 533          a scatterlist. This should be selected by a driver or an API which
 534          whishes to split a scatterlist amongst multiple DMA channels.
 535
 536 config SG_POOL
 537         def_bool n
 538         help
 539          Provides a helper to allocate chained scatterlists. This should be
 540          selected by a driver or an API which whishes to allocate chained
 541          scatterlist.
 542
 543 #
 544 # sg chaining option
 545 #
 546
 547 config ARCH_HAS_SG_CHAIN
 548         def_bool n
 549
 550 config ARCH_HAS_PMEM_API
 551         bool
 552
 553 config ARCH_HAS_MMIO_FLUSH
 554         bool
 555
 556 config STACKDEPOT
 557         bool
 558         select STACKTRACE
 559
 560 endmenu