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 AUDIT_GENERIC
 189         bool
 190         depends on AUDIT && !AUDIT_ARCH
 191         default y
 192
 193 config AUDIT_ARCH_COMPAT_GENERIC
 194         bool
 195         default n
 196
 197 config AUDIT_COMPAT_GENERIC
 198         bool
 199         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
 200         default y
 201
 202 config RANDOM32_SELFTEST
 203         bool "PRNG perform self test on init"
 204         default n
 205         help
 206           This option enables the 32 bit PRNG library functions to perform a
 207           self test on initialization.
 208
 209 #
 210 # compression support is select'ed if needed
 211 #
 212 config 842_COMPRESS
 213         tristate
 214
 215 config 842_DECOMPRESS
 216         tristate
 217
 218 config ZLIB_INFLATE
 219         tristate
 220
 221 config ZLIB_DEFLATE
 222         tristate
 223         select BITREVERSE
 224
 225 config LZO_COMPRESS
 226         tristate
 227
 228 config LZO_DECOMPRESS
 229         tristate
 230
 231 config LZ4_COMPRESS
 232         tristate
 233
 234 config LZ4HC_COMPRESS
 235         tristate
 236
 237 config LZ4_DECOMPRESS
 238         tristate
 239
 240 source "lib/xz/Kconfig"
 241
 242 #
 243 # These all provide a common interface (hence the apparent duplication with
 244 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 245 #
 246 config DECOMPRESS_GZIP
 247         select ZLIB_INFLATE
 248         tristate
 249
 250 config DECOMPRESS_BZIP2
 251         tristate
 252
 253 config DECOMPRESS_LZMA
 254         tristate
 255
 256 config DECOMPRESS_XZ
 257         select XZ_DEC
 258         tristate
 259
 260 config DECOMPRESS_LZO
 261         select LZO_DECOMPRESS
 262         tristate
 263
 264 config DECOMPRESS_LZ4
 265         select LZ4_DECOMPRESS
 266         tristate
 267
 268 #
 269 # Generic allocator support is selected if needed
 270 #
 271 config GENERIC_ALLOCATOR
 272         bool
 273
 274 #
 275 # reed solomon support is select'ed if needed
 276 #
 277 config REED_SOLOMON
 278         tristate
 279
 280 config REED_SOLOMON_ENC8
 281         bool
 282
 283 config REED_SOLOMON_DEC8
 284         bool
 285
 286 config REED_SOLOMON_ENC16
 287         bool
 288
 289 config REED_SOLOMON_DEC16
 290         bool
 291
 292 #
 293 # BCH support is selected if needed
 294 #
 295 config BCH
 296         tristate
 297
 298 config BCH_CONST_PARAMS
 299         bool
 300         help
 301           Drivers may select this option to force specific constant
 302           values for parameters 'm' (Galois field order) and 't'
 303           (error correction capability). Those specific values must
 304           be set by declaring default values for symbols BCH_CONST_M
 305           and BCH_CONST_T.
 306           Doing so will enable extra compiler optimizations,
 307           improving encoding and decoding performance up to 2x for
 308           usual (m,t) values (typically such that m*t < 200).
 309           When this option is selected, the BCH library supports
 310           only a single (m,t) configuration. This is mainly useful
 311           for NAND flash board drivers requiring known, fixed BCH
 312           parameters.
 313
 314 config BCH_CONST_M
 315         int
 316         range 5 15
 317         help
 318           Constant value for Galois field order 'm'. If 'k' is the
 319           number of data bits to protect, 'm' should be chosen such
 320           that (k + m*t) <= 2**m - 1.
 321           Drivers should declare a default value for this symbol if
 322           they select option BCH_CONST_PARAMS.
 323
 324 config BCH_CONST_T
 325         int
 326         help
 327           Constant value for error correction capability in bits 't'.
 328           Drivers should declare a default value for this symbol if
 329           they select option BCH_CONST_PARAMS.
 330
 331 #
 332 # Textsearch support is select'ed if needed
 333 #
 334 config TEXTSEARCH
 335         bool
 336
 337 config TEXTSEARCH_KMP
 338         tristate
 339
 340 config TEXTSEARCH_BM
 341         tristate
 342
 343 config TEXTSEARCH_FSM
 344         tristate
 345
 346 config BTREE
 347         bool
 348
 349 config INTERVAL_TREE
 350         bool
 351         help
 352           Simple, embeddable, interval-tree. Can find the start of an
 353           overlapping range in log(n) time and then iterate over all
 354           overlapping nodes. The algorithm is implemented as an
 355           augmented rbtree.
 356
 357           See:
 358
 359                 Documentation/rbtree.txt
 360
 361           for more information.
 362
 363 config ASSOCIATIVE_ARRAY
 364         bool
 365         help
 366           Generic associative array.  Can be searched and iterated over whilst
 367           it is being modified.  It is also reasonably quick to search and
 368           modify.  The algorithms are non-recursive, and the trees are highly
 369           capacious.
 370
 371           See:
 372
 373                 Documentation/assoc_array.txt
 374
 375           for more information.
 376
 377 config HAS_IOMEM
 378         bool
 379         depends on !NO_IOMEM
 380         select GENERIC_IO
 381         default y
 382
 383 config HAS_IOPORT_MAP
 384         bool
 385         depends on HAS_IOMEM && !NO_IOPORT_MAP
 386         default y
 387
 388 config HAS_DMA
 389         bool
 390         depends on !NO_DMA
 391         default y
 392
 393 config CHECK_SIGNATURE
 394         bool
 395
 396 config CPUMASK_OFFSTACK
 397         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 398         help
 399           Use dynamic allocation for cpumask_var_t, instead of putting
 400           them on the stack.  This is a bit more expensive, but avoids
 401           stack overflow.
 402
 403 config CPU_RMAP
 404         bool
 405         depends on SMP
 406
 407 config DQL
 408         bool
 409
 410 config GLOB
 411         bool
 412 #       This actually supports modular compilation, but the module overhead
 413 #       is ridiculous for the amount of code involved.  Until an out-of-tree
 414 #       driver asks for it, we'll just link it directly it into the kernel
 415 #       when required.  Since we're ignoring out-of-tree users, there's also
 416 #       no need bother prompting for a manual decision:
 417 #       prompt "glob_match() function"
 418         help
 419           This option provides a glob_match function for performing
 420           simple text pattern matching.  It originated in the ATA code
 421           to blacklist particular drive models, but other device drivers
 422           may need similar functionality.
 423
 424           All drivers in the Linux kernel tree that require this function
 425           should automatically select this option.  Say N unless you
 426           are compiling an out-of tree driver which tells you that it
 427           depends on this.
 428
 429 config GLOB_SELFTEST
 430         bool "glob self-test on init"
 431         default n
 432         depends on GLOB
 433         help
 434           This option enables a simple self-test of the glob_match
 435           function on startup.  It is primarily useful for people
 436           working on the code to ensure they haven't introduced any
 437           regressions.
 438
 439           It only adds a little bit of code and slows kernel boot (or
 440           module load) by a small amount, so you're welcome to play with
 441           it, but you probably don't need it.
 442
 443 #
 444 # Netlink attribute parsing support is select'ed if needed
 445 #
 446 config NLATTR
 447         bool
 448
 449 #
 450 # Generic 64-bit atomic support is selected if needed
 451 #
 452 config GENERIC_ATOMIC64
 453        bool
 454
 455 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 456         def_bool y if GENERIC_ATOMIC64
 457
 458 config LRU_CACHE
 459         tristate
 460
 461 config CLZ_TAB
 462         bool
 463
 464 config CORDIC
 465         tristate "CORDIC algorithm"
 466         help
 467           This option provides an implementation of the CORDIC algorithm;
 468           calculations are in fixed point. Module will be called cordic.
 469
 470 config DDR
 471         bool "JEDEC DDR data"
 472         help
 473           Data from JEDEC specs for DDR SDRAM memories,
 474           particularly the AC timing parameters and addressing
 475           information. This data is useful for drivers handling
 476           DDR SDRAM controllers.
 477
 478 config MPILIB
 479         tristate
 480         select CLZ_TAB
 481         help
 482           Multiprecision maths library from GnuPG.
 483           It is used to implement RSA digital signature verification,
 484           which is used by IMA/EVM digital signature extension.
 485
 486 config SIGNATURE
 487         tristate
 488         depends on KEYS
 489         select CRYPTO
 490         select CRYPTO_SHA1
 491         select MPILIB
 492         help
 493           Digital signature verification. Currently only RSA is supported.
 494           Implementation is done using GnuPG MPI library
 495
 496 #
 497 # libfdt files, only selected if needed.
 498 #
 499 config LIBFDT
 500         bool
 501
 502 config OID_REGISTRY
 503         tristate
 504         help
 505           Enable fast lookup object identifier registry.
 506
 507 config UCS2_STRING
 508         tristate
 509
 510 source "lib/fonts/Kconfig"
 511
 512 config SG_SPLIT
 513         def_bool n
 514         help
 515          Provides a heler to split scatterlists into chunks, each chunk being a
 516          scatterlist. This should be selected by a driver or an API which
 517          whishes to split a scatterlist amongst multiple DMA channel.
 518
 519 #
 520 # sg chaining option
 521 #
 522
 523 config ARCH_HAS_SG_CHAIN
 524         def_bool n
 525
 526 config ARCH_HAS_PMEM_API
 527         bool
 528
 529 config ARCH_HAS_MMIO_FLUSH
 530         bool
 531
 532 endmenu