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 RATIONAL
  17         boolean
  18
  19 config GENERIC_STRNCPY_FROM_USER
  20         bool
  21
  22 config GENERIC_STRNLEN_USER
  23         bool
  24
  25 config GENERIC_NET_UTILS
  26         bool
  27
  28 config GENERIC_FIND_FIRST_BIT
  29         bool
  30
  31 config NO_GENERIC_PCI_IOPORT_MAP
  32         bool
  33
  34 config GENERIC_PCI_IOMAP
  35         bool
  36
  37 config GENERIC_IOMAP
  38         bool
  39         select GENERIC_PCI_IOMAP
  40
  41 config GENERIC_IO
  42         boolean
  43         default n
  44
  45 config STMP_DEVICE
  46         bool
  47
  48 config PERCPU_RWSEM
  49         boolean
  50
  51 config ARCH_USE_CMPXCHG_LOCKREF
  52         bool
  53
  54 config CRC_CCITT
  55         tristate "CRC-CCITT functions"
  56         help
  57           This option is provided for the case where no in-kernel-tree
  58           modules require CRC-CCITT functions, but a module built outside
  59           the kernel tree does. Such modules that use library CRC-CCITT
  60           functions require M here.
  61
  62 config CRC16
  63         tristate "CRC16 functions"
  64         help
  65           This option is provided for the case where no in-kernel-tree
  66           modules require CRC16 functions, but a module built outside
  67           the kernel tree does. Such modules that use library CRC16
  68           functions require M here.
  69
  70 config CRC_T10DIF
  71         tristate "CRC calculation for the T10 Data Integrity Field"
  72         select CRYPTO
  73         select CRYPTO_CRCT10DIF
  74         help
  75           This option is only needed if a module that's not in the
  76           kernel tree needs to calculate CRC checks for use with the
  77           SCSI data integrity subsystem.
  78
  79 config CRC_ITU_T
  80         tristate "CRC ITU-T V.41 functions"
  81         help
  82           This option is provided for the case where no in-kernel-tree
  83           modules require CRC ITU-T V.41 functions, but a module built outside
  84           the kernel tree does. Such modules that use library CRC ITU-T V.41
  85           functions require M here.
  86
  87 config CRC32
  88         tristate "CRC32/CRC32c functions"
  89         default y
  90         select BITREVERSE
  91         help
  92           This option is provided for the case where no in-kernel-tree
  93           modules require CRC32/CRC32c functions, but a module built outside
  94           the kernel tree does. Such modules that use library CRC32/CRC32c
  95           functions require M here.
  96
  97 config CRC32_SELFTEST
  98         bool "CRC32 perform self test on init"
  99         default n
 100         depends on CRC32
 101         help
 102           This option enables the CRC32 library functions to perform a
 103           self test on initialization. The self test computes crc32_le
 104           and crc32_be over byte strings with random alignment and length
 105           and computes the total elapsed time and number of bytes processed.
 106
 107 choice
 108         prompt "CRC32 implementation"
 109         depends on CRC32
 110         default CRC32_SLICEBY8
 111         help
 112           This option allows a kernel builder to override the default choice
 113           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
 114           know that you need one of the others.
 115
 116 config CRC32_SLICEBY8
 117         bool "Slice by 8 bytes"
 118         help
 119           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 120           This is the fastest algorithm, but comes with a 8KiB lookup table.
 121           Most modern processors have enough cache to hold this table without
 122           thrashing the cache.
 123
 124           This is the default implementation choice.  Choose this one unless
 125           you have a good reason not to.
 126
 127 config CRC32_SLICEBY4
 128         bool "Slice by 4 bytes"
 129         help
 130           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 131           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 132           table.
 133
 134           Only choose this option if you know what you are doing.
 135
 136 config CRC32_SARWATE
 137         bool "Sarwate's Algorithm (one byte at a time)"
 138         help
 139           Calculate checksum a byte at a time using Sarwate's algorithm.  This
 140           is not particularly fast, but has a small 256 byte lookup table.
 141
 142           Only choose this option if you know what you are doing.
 143
 144 config CRC32_BIT
 145         bool "Classic Algorithm (one bit at a time)"
 146         help
 147           Calculate checksum one bit at a time.  This is VERY slow, but has
 148           no lookup table.  This is provided as a debugging option.
 149
 150           Only choose this option if you are debugging crc32.
 151
 152 endchoice
 153
 154 config CRC7
 155         tristate "CRC7 functions"
 156         help
 157           This option is provided for the case where no in-kernel-tree
 158           modules require CRC7 functions, but a module built outside
 159           the kernel tree does. Such modules that use library CRC7
 160           functions require M here.
 161
 162 config LIBCRC32C
 163         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 164         select CRYPTO
 165         select CRYPTO_CRC32C
 166         help
 167           This option is provided for the case where no in-kernel-tree
 168           modules require CRC32c functions, but a module built outside the
 169           kernel tree does. Such modules that use library CRC32c functions
 170           require M here.  See Castagnoli93.
 171           Module will be libcrc32c.
 172
 173 config CRC8
 174         tristate "CRC8 function"
 175         help
 176           This option provides CRC8 function. Drivers may select this
 177           when they need to do cyclic redundancy check according CRC8
 178           algorithm. Module will be called crc8.
 179
 180 config AUDIT_GENERIC
 181         bool
 182         depends on AUDIT && !AUDIT_ARCH
 183         default y
 184
 185 config AUDIT_ARCH_COMPAT_GENERIC
 186         bool
 187         default n
 188
 189 config AUDIT_COMPAT_GENERIC
 190         bool
 191         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
 192         default y
 193
 194 config RANDOM32_SELFTEST
 195         bool "PRNG perform self test on init"
 196         default n
 197         help
 198           This option enables the 32 bit PRNG library functions to perform a
 199           self test on initialization.
 200
 201 #
 202 # compression support is select'ed if needed
 203 #
 204 config ZLIB_INFLATE
 205         tristate
 206
 207 config ZLIB_DEFLATE
 208         tristate
 209
 210 config LZO_COMPRESS
 211         tristate
 212
 213 config LZO_DECOMPRESS
 214         tristate
 215
 216 config LZ4_COMPRESS
 217         tristate
 218
 219 config LZ4HC_COMPRESS
 220         tristate
 221
 222 config LZ4_DECOMPRESS
 223         tristate
 224
 225 source "lib/xz/Kconfig"
 226
 227 #
 228 # These all provide a common interface (hence the apparent duplication with
 229 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 230 #
 231 config DECOMPRESS_GZIP
 232         select ZLIB_INFLATE
 233         tristate
 234
 235 config DECOMPRESS_BZIP2
 236         tristate
 237
 238 config DECOMPRESS_LZMA
 239         tristate
 240
 241 config DECOMPRESS_XZ
 242         select XZ_DEC
 243         tristate
 244
 245 config DECOMPRESS_LZO
 246         select LZO_DECOMPRESS
 247         tristate
 248
 249 config DECOMPRESS_LZ4
 250         select LZ4_DECOMPRESS
 251         tristate
 252
 253 #
 254 # Generic allocator support is selected if needed
 255 #
 256 config GENERIC_ALLOCATOR
 257         boolean
 258
 259 #
 260 # reed solomon support is select'ed if needed
 261 #
 262 config REED_SOLOMON
 263         tristate
 264
 265 config REED_SOLOMON_ENC8
 266         boolean
 267
 268 config REED_SOLOMON_DEC8
 269         boolean
 270
 271 config REED_SOLOMON_ENC16
 272         boolean
 273
 274 config REED_SOLOMON_DEC16
 275         boolean
 276
 277 #
 278 # BCH support is selected if needed
 279 #
 280 config BCH
 281         tristate
 282
 283 config BCH_CONST_PARAMS
 284         boolean
 285         help
 286           Drivers may select this option to force specific constant
 287           values for parameters 'm' (Galois field order) and 't'
 288           (error correction capability). Those specific values must
 289           be set by declaring default values for symbols BCH_CONST_M
 290           and BCH_CONST_T.
 291           Doing so will enable extra compiler optimizations,
 292           improving encoding and decoding performance up to 2x for
 293           usual (m,t) values (typically such that m*t < 200).
 294           When this option is selected, the BCH library supports
 295           only a single (m,t) configuration. This is mainly useful
 296           for NAND flash board drivers requiring known, fixed BCH
 297           parameters.
 298
 299 config BCH_CONST_M
 300         int
 301         range 5 15
 302         help
 303           Constant value for Galois field order 'm'. If 'k' is the
 304           number of data bits to protect, 'm' should be chosen such
 305           that (k + m*t) <= 2**m - 1.
 306           Drivers should declare a default value for this symbol if
 307           they select option BCH_CONST_PARAMS.
 308
 309 config BCH_CONST_T
 310         int
 311         help
 312           Constant value for error correction capability in bits 't'.
 313           Drivers should declare a default value for this symbol if
 314           they select option BCH_CONST_PARAMS.
 315
 316 #
 317 # Textsearch support is select'ed if needed
 318 #
 319 config TEXTSEARCH
 320         boolean
 321
 322 config TEXTSEARCH_KMP
 323         tristate
 324
 325 config TEXTSEARCH_BM
 326         tristate
 327
 328 config TEXTSEARCH_FSM
 329         tristate
 330
 331 config BTREE
 332         boolean
 333
 334 config INTERVAL_TREE
 335         boolean
 336         help
 337           Simple, embeddable, interval-tree. Can find the start of an
 338           overlapping range in log(n) time and then iterate over all
 339           overlapping nodes. The algorithm is implemented as an
 340           augmented rbtree.
 341
 342           See:
 343
 344                 Documentation/rbtree.txt
 345
 346           for more information.
 347
 348 config ASSOCIATIVE_ARRAY
 349         bool
 350         help
 351           Generic associative array.  Can be searched and iterated over whilst
 352           it is being modified.  It is also reasonably quick to search and
 353           modify.  The algorithms are non-recursive, and the trees are highly
 354           capacious.
 355
 356           See:
 357
 358                 Documentation/assoc_array.txt
 359
 360           for more information.
 361
 362 config HAS_IOMEM
 363         boolean
 364         depends on !NO_IOMEM
 365         select GENERIC_IO
 366         default y
 367
 368 config HAS_IOPORT_MAP
 369         boolean
 370         depends on HAS_IOMEM && !NO_IOPORT_MAP
 371         default y
 372
 373 config HAS_DMA
 374         boolean
 375         depends on !NO_DMA
 376         default y
 377
 378 config CHECK_SIGNATURE
 379         bool
 380
 381 config CPUMASK_OFFSTACK
 382         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 383         help
 384           Use dynamic allocation for cpumask_var_t, instead of putting
 385           them on the stack.  This is a bit more expensive, but avoids
 386           stack overflow.
 387
 388 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 389        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 390        depends on BROKEN
 391
 392 config CPU_RMAP
 393         bool
 394         depends on SMP
 395
 396 config DQL
 397         bool
 398
 399 config GLOB
 400         bool
 401 #       This actually supports modular compilation, but the module overhead
 402 #       is ridiculous for the amount of code involved.  Until an out-of-tree
 403 #       driver asks for it, we'll just link it directly it into the kernel
 404 #       when required.  Since we're ignoring out-of-tree users, there's also
 405 #       no need bother prompting for a manual decision:
 406 #       prompt "glob_match() function"
 407         help
 408           This option provides a glob_match function for performing
 409           simple text pattern matching.  It originated in the ATA code
 410           to blacklist particular drive models, but other device drivers
 411           may need similar functionality.
 412
 413           All drivers in the Linux kernel tree that require this function
 414           should automatically select this option.  Say N unless you
 415           are compiling an out-of tree driver which tells you that it
 416           depends on this.
 417
 418 config GLOB_SELFTEST
 419         bool "glob self-test on init"
 420         default n
 421         depends on GLOB
 422         help
 423           This option enables a simple self-test of the glob_match
 424           function on startup.  It is primarily useful for people
 425           working on the code to ensure they haven't introduced any
 426           regressions.
 427
 428           It only adds a little bit of code and slows kernel boot (or
 429           module load) by a small amount, so you're welcome to play with
 430           it, but you probably don't need it.
 431
 432 #
 433 # Netlink attribute parsing support is select'ed if needed
 434 #
 435 config NLATTR
 436         bool
 437
 438 #
 439 # Generic 64-bit atomic support is selected if needed
 440 #
 441 config GENERIC_ATOMIC64
 442        bool
 443
 444 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 445         def_bool y if GENERIC_ATOMIC64
 446
 447 config LRU_CACHE
 448         tristate
 449
 450 config AVERAGE
 451         bool "Averaging functions"
 452         help
 453           This option is provided for the case where no in-kernel-tree
 454           modules require averaging functions, but a module built outside
 455           the kernel tree does. Such modules that use library averaging
 456           functions require Y here.
 457
 458           If unsure, say N.
 459
 460 config CLZ_TAB
 461         bool
 462
 463 config CORDIC
 464         tristate "CORDIC algorithm"
 465         help
 466           This option provides an implementation of the CORDIC algorithm;
 467           calculations are in fixed point. Module will be called cordic.
 468
 469 config DDR
 470         bool "JEDEC DDR data"
 471         help
 472           Data from JEDEC specs for DDR SDRAM memories,
 473           particularly the AC timing parameters and addressing
 474           information. This data is useful for drivers handling
 475           DDR SDRAM controllers.
 476
 477 config MPILIB
 478         tristate
 479         select CLZ_TAB
 480         help
 481           Multiprecision maths library from GnuPG.
 482           It is used to implement RSA digital signature verification,
 483           which is used by IMA/EVM digital signature extension.
 484
 485 config SIGNATURE
 486         tristate
 487         depends on KEYS
 488         select CRYPTO
 489         select CRYPTO_SHA1
 490         select MPILIB
 491         help
 492           Digital signature verification. Currently only RSA is supported.
 493           Implementation is done using GnuPG MPI library
 494
 495 #
 496 # libfdt files, only selected if needed.
 497 #
 498 config LIBFDT
 499         bool
 500
 501 config OID_REGISTRY
 502         tristate
 503         help
 504           Enable fast lookup object identifier registry.
 505
 506 config UCS2_STRING
 507         tristate
 508
 509 source "lib/fonts/Kconfig"
 510
 511 #
 512 # sg chaining option
 513 #
 514
 515 config ARCH_HAS_SG_CHAIN
 516         def_bool n
 517
 518 endmenu