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         select CRYPTO
  80         select CRYPTO_CRCT10DIF
  81         help
  82           This option is only needed if a module that's not in the
  83           kernel tree needs to calculate CRC checks for use with the
  84           SCSI data integrity subsystem.
  85
  86 config CRC_ITU_T
  87         tristate "CRC ITU-T V.41 functions"
  88         help
  89           This option is provided for the case where no in-kernel-tree
  90           modules require CRC ITU-T V.41 functions, but a module built outside
  91           the kernel tree does. Such modules that use library CRC ITU-T V.41
  92           functions require M here.
  93
  94 config CRC32
  95         tristate "CRC32/CRC32c functions"
  96         default y
  97         select BITREVERSE
  98         help
  99           This option is provided for the case where no in-kernel-tree
 100           modules require CRC32/CRC32c functions, but a module built outside
 101           the kernel tree does. Such modules that use library CRC32/CRC32c
 102           functions require M here.
 103
 104 config CRC32_SELFTEST
 105         bool "CRC32 perform self test on init"
 106         default n
 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 RANDOM32_SELFTEST
 193         bool "PRNG perform self test on init"
 194         default n
 195         help
 196           This option enables the 32 bit PRNG library functions to perform a
 197           self test on initialization.
 198
 199 #
 200 # compression support is select'ed if needed
 201 #
 202 config ZLIB_INFLATE
 203         tristate
 204
 205 config ZLIB_DEFLATE
 206         tristate
 207
 208 config LZO_COMPRESS
 209         tristate
 210
 211 config LZO_DECOMPRESS
 212         tristate
 213
 214 config LZ4_COMPRESS
 215         tristate
 216
 217 config LZ4HC_COMPRESS
 218         tristate
 219
 220 config LZ4_DECOMPRESS
 221         tristate
 222
 223 source "lib/xz/Kconfig"
 224
 225 #
 226 # These all provide a common interface (hence the apparent duplication with
 227 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 228 #
 229 config DECOMPRESS_GZIP
 230         select ZLIB_INFLATE
 231         tristate
 232
 233 config DECOMPRESS_BZIP2
 234         tristate
 235
 236 config DECOMPRESS_LZMA
 237         tristate
 238
 239 config DECOMPRESS_XZ
 240         select XZ_DEC
 241         tristate
 242
 243 config DECOMPRESS_LZO
 244         select LZO_DECOMPRESS
 245         tristate
 246
 247 config DECOMPRESS_LZ4
 248         select LZ4_DECOMPRESS
 249         tristate
 250
 251 #
 252 # Generic allocator support is selected if needed
 253 #
 254 config GENERIC_ALLOCATOR
 255         boolean
 256
 257 #
 258 # reed solomon support is select'ed if needed
 259 #
 260 config REED_SOLOMON
 261         tristate
 262
 263 config REED_SOLOMON_ENC8
 264         boolean
 265
 266 config REED_SOLOMON_DEC8
 267         boolean
 268
 269 config REED_SOLOMON_ENC16
 270         boolean
 271
 272 config REED_SOLOMON_DEC16
 273         boolean
 274
 275 #
 276 # BCH support is selected if needed
 277 #
 278 config BCH
 279         tristate
 280
 281 config BCH_CONST_PARAMS
 282         boolean
 283         help
 284           Drivers may select this option to force specific constant
 285           values for parameters 'm' (Galois field order) and 't'
 286           (error correction capability). Those specific values must
 287           be set by declaring default values for symbols BCH_CONST_M
 288           and BCH_CONST_T.
 289           Doing so will enable extra compiler optimizations,
 290           improving encoding and decoding performance up to 2x for
 291           usual (m,t) values (typically such that m*t < 200).
 292           When this option is selected, the BCH library supports
 293           only a single (m,t) configuration. This is mainly useful
 294           for NAND flash board drivers requiring known, fixed BCH
 295           parameters.
 296
 297 config BCH_CONST_M
 298         int
 299         range 5 15
 300         help
 301           Constant value for Galois field order 'm'. If 'k' is the
 302           number of data bits to protect, 'm' should be chosen such
 303           that (k + m*t) <= 2**m - 1.
 304           Drivers should declare a default value for this symbol if
 305           they select option BCH_CONST_PARAMS.
 306
 307 config BCH_CONST_T
 308         int
 309         help
 310           Constant value for error correction capability in bits 't'.
 311           Drivers should declare a default value for this symbol if
 312           they select option BCH_CONST_PARAMS.
 313
 314 #
 315 # Textsearch support is select'ed if needed
 316 #
 317 config TEXTSEARCH
 318         boolean
 319
 320 config TEXTSEARCH_KMP
 321         tristate
 322
 323 config TEXTSEARCH_BM
 324         tristate
 325
 326 config TEXTSEARCH_FSM
 327         tristate
 328
 329 config BTREE
 330         boolean
 331
 332 config HAS_IOMEM
 333         boolean
 334         depends on !NO_IOMEM
 335         select GENERIC_IO
 336         default y
 337
 338 config HAS_IOPORT
 339         boolean
 340         depends on HAS_IOMEM && !NO_IOPORT
 341         default y
 342
 343 config HAS_DMA
 344         boolean
 345         depends on !NO_DMA
 346         default y
 347
 348 config CHECK_SIGNATURE
 349         bool
 350
 351 config CPUMASK_OFFSTACK
 352         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 353         help
 354           Use dynamic allocation for cpumask_var_t, instead of putting
 355           them on the stack.  This is a bit more expensive, but avoids
 356           stack overflow.
 357
 358 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 359        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 360        depends on BROKEN
 361
 362 config CPU_RMAP
 363         bool
 364         depends on SMP
 365
 366 config DQL
 367         bool
 368
 369 #
 370 # Netlink attribute parsing support is select'ed if needed
 371 #
 372 config NLATTR
 373         bool
 374
 375 #
 376 # Generic 64-bit atomic support is selected if needed
 377 #
 378 config GENERIC_ATOMIC64
 379        bool
 380
 381 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 382         def_bool y if GENERIC_ATOMIC64
 383
 384 config LRU_CACHE
 385         tristate
 386
 387 config AVERAGE
 388         bool "Averaging functions"
 389         help
 390           This option is provided for the case where no in-kernel-tree
 391           modules require averaging functions, but a module built outside
 392           the kernel tree does. Such modules that use library averaging
 393           functions require Y here.
 394
 395           If unsure, say N.
 396
 397 config CLZ_TAB
 398         bool
 399
 400 config CORDIC
 401         tristate "CORDIC algorithm"
 402         help
 403           This option provides an implementation of the CORDIC algorithm;
 404           calculations are in fixed point. Module will be called cordic.
 405
 406 config DDR
 407         bool "JEDEC DDR data"
 408         help
 409           Data from JEDEC specs for DDR SDRAM memories,
 410           particularly the AC timing parameters and addressing
 411           information. This data is useful for drivers handling
 412           DDR SDRAM controllers.
 413
 414 config MPILIB
 415         tristate
 416         select CLZ_TAB
 417         help
 418           Multiprecision maths library from GnuPG.
 419           It is used to implement RSA digital signature verification,
 420           which is used by IMA/EVM digital signature extension.
 421
 422 config SIGNATURE
 423         tristate
 424         depends on KEYS && CRYPTO
 425         select CRYPTO_SHA1
 426         select MPILIB
 427         help
 428           Digital signature verification. Currently only RSA is supported.
 429           Implementation is done using GnuPG MPI library
 430
 431 #
 432 # libfdt files, only selected if needed.
 433 #
 434 config LIBFDT
 435         bool
 436
 437 config OID_REGISTRY
 438         tristate
 439         help
 440           Enable fast lookup object identifier registry.
 441
 442 config UCS2_STRING
 443         tristate
 444
 445 source "lib/fonts/Kconfig"
 446
 447 endmenu