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 CRC_CCITT
  52         tristate "CRC-CCITT functions"
  53         help
  54           This option is provided for the case where no in-kernel-tree
  55           modules require CRC-CCITT functions, but a module built outside
  56           the kernel tree does. Such modules that use library CRC-CCITT
  57           functions require M here.
  58
  59 config CRC16
  60         tristate "CRC16 functions"
  61         help
  62           This option is provided for the case where no in-kernel-tree
  63           modules require CRC16 functions, but a module built outside
  64           the kernel tree does. Such modules that use library CRC16
  65           functions require M here.
  66
  67 config CRC_T10DIF
  68         tristate "CRC calculation for the T10 Data Integrity Field"
  69         select CRYPTO
  70         select CRYPTO_CRCT10DIF
  71         help
  72           This option is only needed if a module that's not in the
  73           kernel tree needs to calculate CRC checks for use with the
  74           SCSI data integrity subsystem.
  75
  76 config CRC_ITU_T
  77         tristate "CRC ITU-T V.41 functions"
  78         help
  79           This option is provided for the case where no in-kernel-tree
  80           modules require CRC ITU-T V.41 functions, but a module built outside
  81           the kernel tree does. Such modules that use library CRC ITU-T V.41
  82           functions require M here.
  83
  84 config CRC32
  85         tristate "CRC32/CRC32c functions"
  86         default y
  87         select BITREVERSE
  88         help
  89           This option is provided for the case where no in-kernel-tree
  90           modules require CRC32/CRC32c functions, but a module built outside
  91           the kernel tree does. Such modules that use library CRC32/CRC32c
  92           functions require M here.
  93
  94 config CRC32_SELFTEST
  95         bool "CRC32 perform self test on init"
  96         default n
  97         depends on CRC32
  98         help
  99           This option enables the CRC32 library functions to perform a
 100           self test on initialization. The self test computes crc32_le
 101           and crc32_be over byte strings with random alignment and length
 102           and computes the total elapsed time and number of bytes processed.
 103
 104 choice
 105         prompt "CRC32 implementation"
 106         depends on CRC32
 107         default CRC32_SLICEBY8
 108         help
 109           This option allows a kernel builder to override the default choice
 110           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
 111           know that you need one of the others.
 112
 113 config CRC32_SLICEBY8
 114         bool "Slice by 8 bytes"
 115         help
 116           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 117           This is the fastest algorithm, but comes with a 8KiB lookup table.
 118           Most modern processors have enough cache to hold this table without
 119           thrashing the cache.
 120
 121           This is the default implementation choice.  Choose this one unless
 122           you have a good reason not to.
 123
 124 config CRC32_SLICEBY4
 125         bool "Slice by 4 bytes"
 126         help
 127           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 128           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 129           table.
 130
 131           Only choose this option if you know what you are doing.
 132
 133 config CRC32_SARWATE
 134         bool "Sarwate's Algorithm (one byte at a time)"
 135         help
 136           Calculate checksum a byte at a time using Sarwate's algorithm.  This
 137           is not particularly fast, but has a small 256 byte lookup table.
 138
 139           Only choose this option if you know what you are doing.
 140
 141 config CRC32_BIT
 142         bool "Classic Algorithm (one bit at a time)"
 143         help
 144           Calculate checksum one bit at a time.  This is VERY slow, but has
 145           no lookup table.  This is provided as a debugging option.
 146
 147           Only choose this option if you are debugging crc32.
 148
 149 endchoice
 150
 151 config CRC7
 152         tristate "CRC7 functions"
 153         help
 154           This option is provided for the case where no in-kernel-tree
 155           modules require CRC7 functions, but a module built outside
 156           the kernel tree does. Such modules that use library CRC7
 157           functions require M here.
 158
 159 config LIBCRC32C
 160         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 161         select CRYPTO
 162         select CRYPTO_CRC32C
 163         help
 164           This option is provided for the case where no in-kernel-tree
 165           modules require CRC32c functions, but a module built outside the
 166           kernel tree does. Such modules that use library CRC32c functions
 167           require M here.  See Castagnoli93.
 168           Module will be libcrc32c.
 169
 170 config CRC8
 171         tristate "CRC8 function"
 172         help
 173           This option provides CRC8 function. Drivers may select this
 174           when they need to do cyclic redundancy check according CRC8
 175           algorithm. Module will be called crc8.
 176
 177 config AUDIT_GENERIC
 178         bool
 179         depends on AUDIT && !AUDIT_ARCH
 180         default y
 181
 182 #
 183 # compression support is select'ed if needed
 184 #
 185 config ZLIB_INFLATE
 186         tristate
 187
 188 config ZLIB_DEFLATE
 189         tristate
 190
 191 config LZO_COMPRESS
 192         tristate
 193
 194 config LZO_DECOMPRESS
 195         tristate
 196
 197 config LZ4_DECOMPRESS
 198         tristate
 199
 200 source "lib/xz/Kconfig"
 201
 202 #
 203 # These all provide a common interface (hence the apparent duplication with
 204 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 205 #
 206 config DECOMPRESS_GZIP
 207         select ZLIB_INFLATE
 208         tristate
 209
 210 config DECOMPRESS_BZIP2
 211         tristate
 212
 213 config DECOMPRESS_LZMA
 214         tristate
 215
 216 config DECOMPRESS_XZ
 217         select XZ_DEC
 218         tristate
 219
 220 config DECOMPRESS_LZO
 221         select LZO_DECOMPRESS
 222         tristate
 223
 224 config DECOMPRESS_LZ4
 225         select LZ4_DECOMPRESS
 226         tristate
 227
 228 #
 229 # Generic allocator support is selected if needed
 230 #
 231 config GENERIC_ALLOCATOR
 232         boolean
 233
 234 #
 235 # reed solomon support is select'ed if needed
 236 #
 237 config REED_SOLOMON
 238         tristate
 239
 240 config REED_SOLOMON_ENC8
 241         boolean
 242
 243 config REED_SOLOMON_DEC8
 244         boolean
 245
 246 config REED_SOLOMON_ENC16
 247         boolean
 248
 249 config REED_SOLOMON_DEC16
 250         boolean
 251
 252 #
 253 # BCH support is selected if needed
 254 #
 255 config BCH
 256         tristate
 257
 258 config BCH_CONST_PARAMS
 259         boolean
 260         help
 261           Drivers may select this option to force specific constant
 262           values for parameters 'm' (Galois field order) and 't'
 263           (error correction capability). Those specific values must
 264           be set by declaring default values for symbols BCH_CONST_M
 265           and BCH_CONST_T.
 266           Doing so will enable extra compiler optimizations,
 267           improving encoding and decoding performance up to 2x for
 268           usual (m,t) values (typically such that m*t < 200).
 269           When this option is selected, the BCH library supports
 270           only a single (m,t) configuration. This is mainly useful
 271           for NAND flash board drivers requiring known, fixed BCH
 272           parameters.
 273
 274 config BCH_CONST_M
 275         int
 276         range 5 15
 277         help
 278           Constant value for Galois field order 'm'. If 'k' is the
 279           number of data bits to protect, 'm' should be chosen such
 280           that (k + m*t) <= 2**m - 1.
 281           Drivers should declare a default value for this symbol if
 282           they select option BCH_CONST_PARAMS.
 283
 284 config BCH_CONST_T
 285         int
 286         help
 287           Constant value for error correction capability in bits 't'.
 288           Drivers should declare a default value for this symbol if
 289           they select option BCH_CONST_PARAMS.
 290
 291 #
 292 # Textsearch support is select'ed if needed
 293 #
 294 config TEXTSEARCH
 295         boolean
 296
 297 config TEXTSEARCH_KMP
 298         tristate
 299
 300 config TEXTSEARCH_BM
 301         tristate
 302
 303 config TEXTSEARCH_FSM
 304         tristate
 305
 306 config BTREE
 307         boolean
 308
 309 config HAS_IOMEM
 310         boolean
 311         depends on !NO_IOMEM
 312         select GENERIC_IO
 313         default y
 314
 315 config HAS_IOPORT
 316         boolean
 317         depends on HAS_IOMEM && !NO_IOPORT
 318         default y
 319
 320 config HAS_DMA
 321         boolean
 322         depends on !NO_DMA
 323         default y
 324
 325 config CHECK_SIGNATURE
 326         bool
 327
 328 config CPUMASK_OFFSTACK
 329         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 330         help
 331           Use dynamic allocation for cpumask_var_t, instead of putting
 332           them on the stack.  This is a bit more expensive, but avoids
 333           stack overflow.
 334
 335 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 336        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 337        depends on BROKEN
 338
 339 config CPU_RMAP
 340         bool
 341         depends on SMP
 342
 343 config DQL
 344         bool
 345
 346 #
 347 # Netlink attribute parsing support is select'ed if needed
 348 #
 349 config NLATTR
 350         bool
 351
 352 #
 353 # Generic 64-bit atomic support is selected if needed
 354 #
 355 config GENERIC_ATOMIC64
 356        bool
 357
 358 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 359         def_bool y if GENERIC_ATOMIC64
 360
 361 config LRU_CACHE
 362         tristate
 363
 364 config AVERAGE
 365         bool "Averaging functions"
 366         help
 367           This option is provided for the case where no in-kernel-tree
 368           modules require averaging functions, but a module built outside
 369           the kernel tree does. Such modules that use library averaging
 370           functions require Y here.
 371
 372           If unsure, say N.
 373
 374 config CLZ_TAB
 375         bool
 376
 377 config CORDIC
 378         tristate "CORDIC algorithm"
 379         help
 380           This option provides an implementation of the CORDIC algorithm;
 381           calculations are in fixed point. Module will be called cordic.
 382
 383 config DDR
 384         bool "JEDEC DDR data"
 385         help
 386           Data from JEDEC specs for DDR SDRAM memories,
 387           particularly the AC timing parameters and addressing
 388           information. This data is useful for drivers handling
 389           DDR SDRAM controllers.
 390
 391 config MPILIB
 392         tristate
 393         select CLZ_TAB
 394         help
 395           Multiprecision maths library from GnuPG.
 396           It is used to implement RSA digital signature verification,
 397           which is used by IMA/EVM digital signature extension.
 398
 399 config SIGNATURE
 400         tristate
 401         depends on KEYS && CRYPTO
 402         select CRYPTO_SHA1
 403         select MPILIB
 404         help
 405           Digital signature verification. Currently only RSA is supported.
 406           Implementation is done using GnuPG MPI library
 407
 408 #
 409 # libfdt files, only selected if needed.
 410 #
 411 config LIBFDT
 412         bool
 413
 414 config OID_REGISTRY
 415         tristate
 416         help
 417           Enable fast lookup object identifier registry.
 418
 419 config UCS2_STRING
 420         tristate
 421
 422 source "lib/fonts/Kconfig"
 423
 424 endmenu