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 CMPXCHG_LOCKREF
  55         def_bool y if ARCH_USE_CMPXCHG_LOCKREF
  56         depends on SMP
  57         depends on !GENERIC_LOCKBREAK
  58         depends on !DEBUG_SPINLOCK
  59         depends on !DEBUG_LOCK_ALLOC
  60
  61 config CRC_CCITT
  62         tristate "CRC-CCITT functions"
  63         help
  64           This option is provided for the case where no in-kernel-tree
  65           modules require CRC-CCITT functions, but a module built outside
  66           the kernel tree does. Such modules that use library CRC-CCITT
  67           functions require M here.
  68
  69 config CRC16
  70         tristate "CRC16 functions"
  71         help
  72           This option is provided for the case where no in-kernel-tree
  73           modules require CRC16 functions, but a module built outside
  74           the kernel tree does. Such modules that use library CRC16
  75           functions require M here.
  76
  77 config CRC_T10DIF
  78         tristate "CRC calculation for the T10 Data Integrity Field"
  79         help
  80           This option is only needed if a module that's not in the
  81           kernel tree needs to calculate CRC checks for use with the
  82           SCSI data integrity subsystem.
  83
  84 config CRC_ITU_T
  85         tristate "CRC ITU-T V.41 functions"
  86         help
  87           This option is provided for the case where no in-kernel-tree
  88           modules require CRC ITU-T V.41 functions, but a module built outside
  89           the kernel tree does. Such modules that use library CRC ITU-T V.41
  90           functions require M here.
  91
  92 config CRC32
  93         tristate "CRC32/CRC32c functions"
  94         default y
  95         select BITREVERSE
  96         help
  97           This option is provided for the case where no in-kernel-tree
  98           modules require CRC32/CRC32c functions, but a module built outside
  99           the kernel tree does. Such modules that use library CRC32/CRC32c
 100           functions require M here.
 101
 102 config CRC32_SELFTEST
 103         bool "CRC32 perform self test on init"
 104         default n
 105         depends on CRC32
 106         help
 107           This option enables the CRC32 library functions to perform a
 108           self test on initialization. The self test computes crc32_le
 109           and crc32_be over byte strings with random alignment and length
 110           and computes the total elapsed time and number of bytes processed.
 111
 112 choice
 113         prompt "CRC32 implementation"
 114         depends on CRC32
 115         default CRC32_SLICEBY8
 116         help
 117           This option allows a kernel builder to override the default choice
 118           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
 119           know that you need one of the others.
 120
 121 config CRC32_SLICEBY8
 122         bool "Slice by 8 bytes"
 123         help
 124           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 125           This is the fastest algorithm, but comes with a 8KiB lookup table.
 126           Most modern processors have enough cache to hold this table without
 127           thrashing the cache.
 128
 129           This is the default implementation choice.  Choose this one unless
 130           you have a good reason not to.
 131
 132 config CRC32_SLICEBY4
 133         bool "Slice by 4 bytes"
 134         help
 135           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 136           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 137           table.
 138
 139           Only choose this option if you know what you are doing.
 140
 141 config CRC32_SARWATE
 142         bool "Sarwate's Algorithm (one byte at a time)"
 143         help
 144           Calculate checksum a byte at a time using Sarwate's algorithm.  This
 145           is not particularly fast, but has a small 256 byte lookup table.
 146
 147           Only choose this option if you know what you are doing.
 148
 149 config CRC32_BIT
 150         bool "Classic Algorithm (one bit at a time)"
 151         help
 152           Calculate checksum one bit at a time.  This is VERY slow, but has
 153           no lookup table.  This is provided as a debugging option.
 154
 155           Only choose this option if you are debugging crc32.
 156
 157 endchoice
 158
 159 config CRC7
 160         tristate "CRC7 functions"
 161         help
 162           This option is provided for the case where no in-kernel-tree
 163           modules require CRC7 functions, but a module built outside
 164           the kernel tree does. Such modules that use library CRC7
 165           functions require M here.
 166
 167 config LIBCRC32C
 168         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 169         select CRYPTO
 170         select CRYPTO_CRC32C
 171         help
 172           This option is provided for the case where no in-kernel-tree
 173           modules require CRC32c functions, but a module built outside the
 174           kernel tree does. Such modules that use library CRC32c functions
 175           require M here.  See Castagnoli93.
 176           Module will be libcrc32c.
 177
 178 config CRC8
 179         tristate "CRC8 function"
 180         help
 181           This option provides CRC8 function. Drivers may select this
 182           when they need to do cyclic redundancy check according CRC8
 183           algorithm. Module will be called crc8.
 184
 185 config AUDIT_GENERIC
 186         bool
 187         depends on AUDIT && !AUDIT_ARCH
 188         default y
 189
 190 #
 191 # compression support is select'ed if needed
 192 #
 193 config ZLIB_INFLATE
 194         tristate
 195
 196 config ZLIB_DEFLATE
 197         tristate
 198
 199 config LZO_COMPRESS
 200         tristate
 201
 202 config LZO_DECOMPRESS
 203         tristate
 204
 205 config LZ4_COMPRESS
 206         tristate
 207
 208 config LZ4HC_COMPRESS
 209         tristate
 210
 211 config LZ4_DECOMPRESS
 212         tristate
 213
 214 source "lib/xz/Kconfig"
 215
 216 #
 217 # These all provide a common interface (hence the apparent duplication with
 218 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 219 #
 220 config DECOMPRESS_GZIP
 221         select ZLIB_INFLATE
 222         tristate
 223
 224 config DECOMPRESS_BZIP2
 225         tristate
 226
 227 config DECOMPRESS_LZMA
 228         tristate
 229
 230 config DECOMPRESS_XZ
 231         select XZ_DEC
 232         tristate
 233
 234 config DECOMPRESS_LZO
 235         select LZO_DECOMPRESS
 236         tristate
 237
 238 config DECOMPRESS_LZ4
 239         select LZ4_DECOMPRESS
 240         tristate
 241
 242 #
 243 # Generic allocator support is selected if needed
 244 #
 245 config GENERIC_ALLOCATOR
 246         boolean
 247
 248 #
 249 # reed solomon support is select'ed if needed
 250 #
 251 config REED_SOLOMON
 252         tristate
 253
 254 config REED_SOLOMON_ENC8
 255         boolean
 256
 257 config REED_SOLOMON_DEC8
 258         boolean
 259
 260 config REED_SOLOMON_ENC16
 261         boolean
 262
 263 config REED_SOLOMON_DEC16
 264         boolean
 265
 266 #
 267 # BCH support is selected if needed
 268 #
 269 config BCH
 270         tristate
 271
 272 config BCH_CONST_PARAMS
 273         boolean
 274         help
 275           Drivers may select this option to force specific constant
 276           values for parameters 'm' (Galois field order) and 't'
 277           (error correction capability). Those specific values must
 278           be set by declaring default values for symbols BCH_CONST_M
 279           and BCH_CONST_T.
 280           Doing so will enable extra compiler optimizations,
 281           improving encoding and decoding performance up to 2x for
 282           usual (m,t) values (typically such that m*t < 200).
 283           When this option is selected, the BCH library supports
 284           only a single (m,t) configuration. This is mainly useful
 285           for NAND flash board drivers requiring known, fixed BCH
 286           parameters.
 287
 288 config BCH_CONST_M
 289         int
 290         range 5 15
 291         help
 292           Constant value for Galois field order 'm'. If 'k' is the
 293           number of data bits to protect, 'm' should be chosen such
 294           that (k + m*t) <= 2**m - 1.
 295           Drivers should declare a default value for this symbol if
 296           they select option BCH_CONST_PARAMS.
 297
 298 config BCH_CONST_T
 299         int
 300         help
 301           Constant value for error correction capability in bits 't'.
 302           Drivers should declare a default value for this symbol if
 303           they select option BCH_CONST_PARAMS.
 304
 305 #
 306 # Textsearch support is select'ed if needed
 307 #
 308 config TEXTSEARCH
 309         boolean
 310
 311 config TEXTSEARCH_KMP
 312         tristate
 313
 314 config TEXTSEARCH_BM
 315         tristate
 316
 317 config TEXTSEARCH_FSM
 318         tristate
 319
 320 config BTREE
 321         boolean
 322
 323 config HAS_IOMEM
 324         boolean
 325         depends on !NO_IOMEM
 326         select GENERIC_IO
 327         default y
 328
 329 config HAS_IOPORT
 330         boolean
 331         depends on HAS_IOMEM && !NO_IOPORT
 332         default y
 333
 334 config HAS_DMA
 335         boolean
 336         depends on !NO_DMA
 337         default y
 338
 339 config CHECK_SIGNATURE
 340         bool
 341
 342 config CPUMASK_OFFSTACK
 343         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 344         help
 345           Use dynamic allocation for cpumask_var_t, instead of putting
 346           them on the stack.  This is a bit more expensive, but avoids
 347           stack overflow.
 348
 349 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 350        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 351        depends on BROKEN
 352
 353 config CPU_RMAP
 354         bool
 355         depends on SMP
 356
 357 config DQL
 358         bool
 359
 360 #
 361 # Netlink attribute parsing support is select'ed if needed
 362 #
 363 config NLATTR
 364         bool
 365
 366 #
 367 # Generic 64-bit atomic support is selected if needed
 368 #
 369 config GENERIC_ATOMIC64
 370        bool
 371
 372 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 373         def_bool y if GENERIC_ATOMIC64
 374
 375 config LRU_CACHE
 376         tristate
 377
 378 config AVERAGE
 379         bool "Averaging functions"
 380         help
 381           This option is provided for the case where no in-kernel-tree
 382           modules require averaging functions, but a module built outside
 383           the kernel tree does. Such modules that use library averaging
 384           functions require Y here.
 385
 386           If unsure, say N.
 387
 388 config CLZ_TAB
 389         bool
 390
 391 config CORDIC
 392         tristate "CORDIC algorithm"
 393         help
 394           This option provides an implementation of the CORDIC algorithm;
 395           calculations are in fixed point. Module will be called cordic.
 396
 397 config DDR
 398         bool "JEDEC DDR data"
 399         help
 400           Data from JEDEC specs for DDR SDRAM memories,
 401           particularly the AC timing parameters and addressing
 402           information. This data is useful for drivers handling
 403           DDR SDRAM controllers.
 404
 405 config MPILIB
 406         tristate
 407         select CLZ_TAB
 408         help
 409           Multiprecision maths library from GnuPG.
 410           It is used to implement RSA digital signature verification,
 411           which is used by IMA/EVM digital signature extension.
 412
 413 config SIGNATURE
 414         tristate
 415         depends on KEYS && CRYPTO
 416         select CRYPTO_SHA1
 417         select MPILIB
 418         help
 419           Digital signature verification. Currently only RSA is supported.
 420           Implementation is done using GnuPG MPI library
 421
 422 #
 423 # libfdt files, only selected if needed.
 424 #
 425 config LIBFDT
 426         bool
 427
 428 config OID_REGISTRY
 429         tristate
 430         help
 431           Enable fast lookup object identifier registry.
 432
 433 config UCS2_STRING
 434         tristate
 435
 436 source "lib/fonts/Kconfig"
 437
 438 endmenu