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 ASSOCIATIVE_ARRAY
 335         bool
 336         help
 337           Generic associative array.  Can be searched and iterated over whilst
 338           it is being modified.  It is also reasonably quick to search and
 339           modify.  The algorithms are non-recursive, and the trees are highly
 340           capacious.
 341
 342           See:
 343
 344                 Documentation/assoc_array.txt
 345
 346           for more information.
 347
 348 config HAS_IOMEM
 349         boolean
 350         depends on !NO_IOMEM
 351         select GENERIC_IO
 352         default y
 353
 354 config HAS_IOPORT_MAP
 355         boolean
 356         depends on HAS_IOMEM && !NO_IOPORT_MAP
 357         default y
 358
 359 config HAS_DMA
 360         boolean
 361         depends on !NO_DMA
 362         default y
 363
 364 config CHECK_SIGNATURE
 365         bool
 366
 367 config CPUMASK_OFFSTACK
 368         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 369         help
 370           Use dynamic allocation for cpumask_var_t, instead of putting
 371           them on the stack.  This is a bit more expensive, but avoids
 372           stack overflow.
 373
 374 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 375        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 376        depends on BROKEN
 377
 378 config CPU_RMAP
 379         bool
 380         depends on SMP
 381
 382 config DQL
 383         bool
 384
 385 #
 386 # Netlink attribute parsing support is select'ed if needed
 387 #
 388 config NLATTR
 389         bool
 390
 391 #
 392 # Generic 64-bit atomic support is selected if needed
 393 #
 394 config GENERIC_ATOMIC64
 395        bool
 396
 397 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 398         def_bool y if GENERIC_ATOMIC64
 399
 400 config LRU_CACHE
 401         tristate
 402
 403 config AVERAGE
 404         bool "Averaging functions"
 405         help
 406           This option is provided for the case where no in-kernel-tree
 407           modules require averaging functions, but a module built outside
 408           the kernel tree does. Such modules that use library averaging
 409           functions require Y here.
 410
 411           If unsure, say N.
 412
 413 config CLZ_TAB
 414         bool
 415
 416 config CORDIC
 417         tristate "CORDIC algorithm"
 418         help
 419           This option provides an implementation of the CORDIC algorithm;
 420           calculations are in fixed point. Module will be called cordic.
 421
 422 config DDR
 423         bool "JEDEC DDR data"
 424         help
 425           Data from JEDEC specs for DDR SDRAM memories,
 426           particularly the AC timing parameters and addressing
 427           information. This data is useful for drivers handling
 428           DDR SDRAM controllers.
 429
 430 config MPILIB
 431         tristate
 432         select CLZ_TAB
 433         help
 434           Multiprecision maths library from GnuPG.
 435           It is used to implement RSA digital signature verification,
 436           which is used by IMA/EVM digital signature extension.
 437
 438 config SIGNATURE
 439         tristate
 440         depends on KEYS && CRYPTO
 441         select CRYPTO_SHA1
 442         select MPILIB
 443         help
 444           Digital signature verification. Currently only RSA is supported.
 445           Implementation is done using GnuPG MPI library
 446
 447 #
 448 # libfdt files, only selected if needed.
 449 #
 450 config LIBFDT
 451         bool
 452
 453 config OID_REGISTRY
 454         tristate
 455         help
 456           Enable fast lookup object identifier registry.
 457
 458 config UCS2_STRING
 459         tristate
 460
 461 source "lib/fonts/Kconfig"
 462
 463 endmenu