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 CRC7
 162         tristate "CRC7 functions"
 163         help
 164           This option is provided for the case where no in-kernel-tree
 165           modules require CRC7 functions, but a module built outside
 166           the kernel tree does. Such modules that use library CRC7
 167           functions require M here.
 168
 169 config LIBCRC32C
 170         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 171         select CRYPTO
 172         select CRYPTO_CRC32C
 173         help
 174           This option is provided for the case where no in-kernel-tree
 175           modules require CRC32c functions, but a module built outside the
 176           kernel tree does. Such modules that use library CRC32c functions
 177           require M here.  See Castagnoli93.
 178           Module will be libcrc32c.
 179
 180 config CRC8
 181         tristate "CRC8 function"
 182         help
 183           This option provides CRC8 function. Drivers may select this
 184           when they need to do cyclic redundancy check according CRC8
 185           algorithm. Module will be called crc8.
 186
 187 config AUDIT_GENERIC
 188         bool
 189         depends on AUDIT && !AUDIT_ARCH
 190         default y
 191
 192 config AUDIT_ARCH_COMPAT_GENERIC
 193         bool
 194         default n
 195
 196 config AUDIT_COMPAT_GENERIC
 197         bool
 198         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
 199         default y
 200
 201 config RANDOM32_SELFTEST
 202         bool "PRNG perform self test on init"
 203         default n
 204         help
 205           This option enables the 32 bit PRNG library functions to perform a
 206           self test on initialization.
 207
 208 #
 209 # compression support is select'ed if needed
 210 #
 211 config 842_COMPRESS
 212         select CRC32
 213         tristate
 214
 215 config 842_DECOMPRESS
 216         select CRC32
 217         tristate
 218
 219 config ZLIB_INFLATE
 220         tristate
 221
 222 config ZLIB_DEFLATE
 223         tristate
 224         select BITREVERSE
 225
 226 config LZO_COMPRESS
 227         tristate
 228
 229 config LZO_DECOMPRESS
 230         tristate
 231
 232 config LZ4_COMPRESS
 233         tristate
 234
 235 config LZ4HC_COMPRESS
 236         tristate
 237
 238 config LZ4_DECOMPRESS
 239         tristate
 240
 241 source "lib/xz/Kconfig"
 242
 243 #
 244 # These all provide a common interface (hence the apparent duplication with
 245 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 246 #
 247 config DECOMPRESS_GZIP
 248         select ZLIB_INFLATE
 249         tristate
 250
 251 config DECOMPRESS_BZIP2
 252         tristate
 253
 254 config DECOMPRESS_LZMA
 255         tristate
 256
 257 config DECOMPRESS_XZ
 258         select XZ_DEC
 259         tristate
 260
 261 config DECOMPRESS_LZO
 262         select LZO_DECOMPRESS
 263         tristate
 264
 265 config DECOMPRESS_LZ4
 266         select LZ4_DECOMPRESS
 267         tristate
 268
 269 #
 270 # Generic allocator support is selected if needed
 271 #
 272 config GENERIC_ALLOCATOR
 273         bool
 274
 275 #
 276 # reed solomon support is select'ed if needed
 277 #
 278 config REED_SOLOMON
 279         tristate
 280
 281 config REED_SOLOMON_ENC8
 282         bool
 283
 284 config REED_SOLOMON_DEC8
 285         bool
 286
 287 config REED_SOLOMON_ENC16
 288         bool
 289
 290 config REED_SOLOMON_DEC16
 291         bool
 292
 293 #
 294 # BCH support is selected if needed
 295 #
 296 config BCH
 297         tristate
 298
 299 config BCH_CONST_PARAMS
 300         bool
 301         help
 302           Drivers may select this option to force specific constant
 303           values for parameters 'm' (Galois field order) and 't'
 304           (error correction capability). Those specific values must
 305           be set by declaring default values for symbols BCH_CONST_M
 306           and BCH_CONST_T.
 307           Doing so will enable extra compiler optimizations,
 308           improving encoding and decoding performance up to 2x for
 309           usual (m,t) values (typically such that m*t < 200).
 310           When this option is selected, the BCH library supports
 311           only a single (m,t) configuration. This is mainly useful
 312           for NAND flash board drivers requiring known, fixed BCH
 313           parameters.
 314
 315 config BCH_CONST_M
 316         int
 317         range 5 15
 318         help
 319           Constant value for Galois field order 'm'. If 'k' is the
 320           number of data bits to protect, 'm' should be chosen such
 321           that (k + m*t) <= 2**m - 1.
 322           Drivers should declare a default value for this symbol if
 323           they select option BCH_CONST_PARAMS.
 324
 325 config BCH_CONST_T
 326         int
 327         help
 328           Constant value for error correction capability in bits 't'.
 329           Drivers should declare a default value for this symbol if
 330           they select option BCH_CONST_PARAMS.
 331
 332 #
 333 # Textsearch support is select'ed if needed
 334 #
 335 config TEXTSEARCH
 336         bool
 337
 338 config TEXTSEARCH_KMP
 339         tristate
 340
 341 config TEXTSEARCH_BM
 342         tristate
 343
 344 config TEXTSEARCH_FSM
 345         tristate
 346
 347 config BTREE
 348         bool
 349
 350 config INTERVAL_TREE
 351         bool
 352         help
 353           Simple, embeddable, interval-tree. Can find the start of an
 354           overlapping range in log(n) time and then iterate over all
 355           overlapping nodes. The algorithm is implemented as an
 356           augmented rbtree.
 357
 358           See:
 359
 360                 Documentation/rbtree.txt
 361
 362           for more information.
 363
 364 config RADIX_TREE_MULTIORDER
 365         bool
 366
 367 config ASSOCIATIVE_ARRAY
 368         bool
 369         help
 370           Generic associative array.  Can be searched and iterated over whilst
 371           it is being modified.  It is also reasonably quick to search and
 372           modify.  The algorithms are non-recursive, and the trees are highly
 373           capacious.
 374
 375           See:
 376
 377                 Documentation/assoc_array.txt
 378
 379           for more information.
 380
 381 config HAS_IOMEM
 382         bool
 383         depends on !NO_IOMEM
 384         select GENERIC_IO
 385         default y
 386
 387 config HAS_IOPORT_MAP
 388         bool
 389         depends on HAS_IOMEM && !NO_IOPORT_MAP
 390         default y
 391
 392 config HAS_DMA
 393         bool
 394         depends on !NO_DMA
 395         default y
 396
 397 config CHECK_SIGNATURE
 398         bool
 399
 400 config CPUMASK_OFFSTACK
 401         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 402         help
 403           Use dynamic allocation for cpumask_var_t, instead of putting
 404           them on the stack.  This is a bit more expensive, but avoids
 405           stack overflow.
 406
 407 config CPU_RMAP
 408         bool
 409         depends on SMP
 410
 411 config DQL
 412         bool
 413
 414 config GLOB
 415         bool
 416 #       This actually supports modular compilation, but the module overhead
 417 #       is ridiculous for the amount of code involved.  Until an out-of-tree
 418 #       driver asks for it, we'll just link it directly it into the kernel
 419 #       when required.  Since we're ignoring out-of-tree users, there's also
 420 #       no need bother prompting for a manual decision:
 421 #       prompt "glob_match() function"
 422         help
 423           This option provides a glob_match function for performing
 424           simple text pattern matching.  It originated in the ATA code
 425           to blacklist particular drive models, but other device drivers
 426           may need similar functionality.
 427
 428           All drivers in the Linux kernel tree that require this function
 429           should automatically select this option.  Say N unless you
 430           are compiling an out-of tree driver which tells you that it
 431           depends on this.
 432
 433 config GLOB_SELFTEST
 434         bool "glob self-test on init"
 435         default n
 436         depends on GLOB
 437         help
 438           This option enables a simple self-test of the glob_match
 439           function on startup.  It is primarily useful for people
 440           working on the code to ensure they haven't introduced any
 441           regressions.
 442
 443           It only adds a little bit of code and slows kernel boot (or
 444           module load) by a small amount, so you're welcome to play with
 445           it, but you probably don't need it.
 446
 447 #
 448 # Netlink attribute parsing support is select'ed if needed
 449 #
 450 config NLATTR
 451         bool
 452
 453 #
 454 # Generic 64-bit atomic support is selected if needed
 455 #
 456 config GENERIC_ATOMIC64
 457        bool
 458
 459 config LRU_CACHE
 460         tristate
 461
 462 config CLZ_TAB
 463         bool
 464
 465 config CORDIC
 466         tristate "CORDIC algorithm"
 467         help
 468           This option provides an implementation of the CORDIC algorithm;
 469           calculations are in fixed point. Module will be called cordic.
 470
 471 config DDR
 472         bool "JEDEC DDR data"
 473         help
 474           Data from JEDEC specs for DDR SDRAM memories,
 475           particularly the AC timing parameters and addressing
 476           information. This data is useful for drivers handling
 477           DDR SDRAM controllers.
 478
 479 config IRQ_POLL
 480         bool "IRQ polling library"
 481         help
 482           Helper library to poll interrupt mitigation using polling.
 483
 484 config MPILIB
 485         tristate
 486         select CLZ_TAB
 487         help
 488           Multiprecision maths library from GnuPG.
 489           It is used to implement RSA digital signature verification,
 490           which is used by IMA/EVM digital signature extension.
 491
 492 config SIGNATURE
 493         tristate
 494         depends on KEYS
 495         select CRYPTO
 496         select CRYPTO_SHA1
 497         select MPILIB
 498         help
 499           Digital signature verification. Currently only RSA is supported.
 500           Implementation is done using GnuPG MPI library
 501
 502 #
 503 # libfdt files, only selected if needed.
 504 #
 505 config LIBFDT
 506         bool
 507
 508 config OID_REGISTRY
 509         tristate
 510         help
 511           Enable fast lookup object identifier registry.
 512
 513 config UCS2_STRING
 514         tristate
 515
 516 source "lib/fonts/Kconfig"
 517
 518 config SG_SPLIT
 519         def_bool n
 520         help
 521          Provides a helper to split scatterlists into chunks, each chunk being
 522          a scatterlist. This should be selected by a driver or an API which
 523          whishes to split a scatterlist amongst multiple DMA channels.
 524
 525 config SG_POOL
 526         def_bool n
 527         help
 528          Provides a helper to allocate chained scatterlists. This should be
 529          selected by a driver or an API which whishes to allocate chained
 530          scatterlist.
 531
 532 #
 533 # sg chaining option
 534 #
 535
 536 config ARCH_HAS_SG_CHAIN
 537         def_bool n
 538
 539 config ARCH_HAS_PMEM_API
 540         bool
 541
 542 config ARCH_HAS_MMIO_FLUSH
 543         bool
 544
 545 config STACKDEPOT
 546         bool
 547         select STACKTRACE
 548
 549 config SBITMAP
 550         bool
 551
 552 config PARMAN
 553         tristate
 554
 555 config PRIME_NUMBERS
 556         tristate
 557
 558 endmenu