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 RANDOM32_SELFTEST
 186         bool "PRNG perform self test on init"
 187         default n
 188         help
 189           This option enables the 32 bit PRNG library functions to perform a
 190           self test on initialization.
 191
 192 #
 193 # compression support is select'ed if needed
 194 #
 195 config ZLIB_INFLATE
 196         tristate
 197
 198 config ZLIB_DEFLATE
 199         tristate
 200
 201 config LZO_COMPRESS
 202         tristate
 203
 204 config LZO_DECOMPRESS
 205         tristate
 206
 207 config LZ4_COMPRESS
 208         tristate
 209
 210 config LZ4HC_COMPRESS
 211         tristate
 212
 213 config LZ4_DECOMPRESS
 214         tristate
 215
 216 source "lib/xz/Kconfig"
 217
 218 #
 219 # These all provide a common interface (hence the apparent duplication with
 220 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 221 #
 222 config DECOMPRESS_GZIP
 223         select ZLIB_INFLATE
 224         tristate
 225
 226 config DECOMPRESS_BZIP2
 227         tristate
 228
 229 config DECOMPRESS_LZMA
 230         tristate
 231
 232 config DECOMPRESS_XZ
 233         select XZ_DEC
 234         tristate
 235
 236 config DECOMPRESS_LZO
 237         select LZO_DECOMPRESS
 238         tristate
 239
 240 config DECOMPRESS_LZ4
 241         select LZ4_DECOMPRESS
 242         tristate
 243
 244 #
 245 # Generic allocator support is selected if needed
 246 #
 247 config GENERIC_ALLOCATOR
 248         boolean
 249
 250 #
 251 # reed solomon support is select'ed if needed
 252 #
 253 config REED_SOLOMON
 254         tristate
 255
 256 config REED_SOLOMON_ENC8
 257         boolean
 258
 259 config REED_SOLOMON_DEC8
 260         boolean
 261
 262 config REED_SOLOMON_ENC16
 263         boolean
 264
 265 config REED_SOLOMON_DEC16
 266         boolean
 267
 268 #
 269 # BCH support is selected if needed
 270 #
 271 config BCH
 272         tristate
 273
 274 config BCH_CONST_PARAMS
 275         boolean
 276         help
 277           Drivers may select this option to force specific constant
 278           values for parameters 'm' (Galois field order) and 't'
 279           (error correction capability). Those specific values must
 280           be set by declaring default values for symbols BCH_CONST_M
 281           and BCH_CONST_T.
 282           Doing so will enable extra compiler optimizations,
 283           improving encoding and decoding performance up to 2x for
 284           usual (m,t) values (typically such that m*t < 200).
 285           When this option is selected, the BCH library supports
 286           only a single (m,t) configuration. This is mainly useful
 287           for NAND flash board drivers requiring known, fixed BCH
 288           parameters.
 289
 290 config BCH_CONST_M
 291         int
 292         range 5 15
 293         help
 294           Constant value for Galois field order 'm'. If 'k' is the
 295           number of data bits to protect, 'm' should be chosen such
 296           that (k + m*t) <= 2**m - 1.
 297           Drivers should declare a default value for this symbol if
 298           they select option BCH_CONST_PARAMS.
 299
 300 config BCH_CONST_T
 301         int
 302         help
 303           Constant value for error correction capability in bits 't'.
 304           Drivers should declare a default value for this symbol if
 305           they select option BCH_CONST_PARAMS.
 306
 307 #
 308 # Textsearch support is select'ed if needed
 309 #
 310 config TEXTSEARCH
 311         boolean
 312
 313 config TEXTSEARCH_KMP
 314         tristate
 315
 316 config TEXTSEARCH_BM
 317         tristate
 318
 319 config TEXTSEARCH_FSM
 320         tristate
 321
 322 config BTREE
 323         boolean
 324
 325 config ASSOCIATIVE_ARRAY
 326         bool
 327         help
 328           Generic associative array.  Can be searched and iterated over whilst
 329           it is being modified.  It is also reasonably quick to search and
 330           modify.  The algorithms are non-recursive, and the trees are highly
 331           capacious.
 332
 333           See:
 334
 335                 Documentation/assoc_array.txt
 336
 337           for more information.
 338
 339 config HAS_IOMEM
 340         boolean
 341         depends on !NO_IOMEM
 342         select GENERIC_IO
 343         default y
 344
 345 config HAS_IOPORT
 346         boolean
 347         depends on HAS_IOMEM && !NO_IOPORT
 348         default y
 349
 350 config HAS_DMA
 351         boolean
 352         depends on !NO_DMA
 353         default y
 354
 355 config CHECK_SIGNATURE
 356         bool
 357
 358 config CPUMASK_OFFSTACK
 359         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 360         help
 361           Use dynamic allocation for cpumask_var_t, instead of putting
 362           them on the stack.  This is a bit more expensive, but avoids
 363           stack overflow.
 364
 365 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 366        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 367        depends on BROKEN
 368
 369 config CPU_RMAP
 370         bool
 371         depends on SMP
 372
 373 config DQL
 374         bool
 375
 376 #
 377 # Netlink attribute parsing support is select'ed if needed
 378 #
 379 config NLATTR
 380         bool
 381
 382 #
 383 # Generic 64-bit atomic support is selected if needed
 384 #
 385 config GENERIC_ATOMIC64
 386        bool
 387
 388 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 389         def_bool y if GENERIC_ATOMIC64
 390
 391 config LRU_CACHE
 392         tristate
 393
 394 config AVERAGE
 395         bool "Averaging functions"
 396         help
 397           This option is provided for the case where no in-kernel-tree
 398           modules require averaging functions, but a module built outside
 399           the kernel tree does. Such modules that use library averaging
 400           functions require Y here.
 401
 402           If unsure, say N.
 403
 404 config CLZ_TAB
 405         bool
 406
 407 config CORDIC
 408         tristate "CORDIC algorithm"
 409         help
 410           This option provides an implementation of the CORDIC algorithm;
 411           calculations are in fixed point. Module will be called cordic.
 412
 413 config DDR
 414         bool "JEDEC DDR data"
 415         help
 416           Data from JEDEC specs for DDR SDRAM memories,
 417           particularly the AC timing parameters and addressing
 418           information. This data is useful for drivers handling
 419           DDR SDRAM controllers.
 420
 421 config MPILIB
 422         tristate
 423         select CLZ_TAB
 424         help
 425           Multiprecision maths library from GnuPG.
 426           It is used to implement RSA digital signature verification,
 427           which is used by IMA/EVM digital signature extension.
 428
 429 config SIGNATURE
 430         tristate
 431         depends on KEYS && CRYPTO
 432         select CRYPTO_SHA1
 433         select MPILIB
 434         help
 435           Digital signature verification. Currently only RSA is supported.
 436           Implementation is done using GnuPG MPI library
 437
 438 #
 439 # libfdt files, only selected if needed.
 440 #
 441 config LIBFDT
 442         bool
 443
 444 config OID_REGISTRY
 445         tristate
 446         help
 447           Enable fast lookup object identifier registry.
 448
 449 config UCS2_STRING
 450         tristate
 451
 452 source "lib/fonts/Kconfig"
 453
 454 endmenu