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 #
 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 HAS_IOMEM
 326         boolean
 327         depends on !NO_IOMEM
 328         select GENERIC_IO
 329         default y
 330
 331 config HAS_IOPORT
 332         boolean
 333         depends on HAS_IOMEM && !NO_IOPORT
 334         default y
 335
 336 config HAS_DMA
 337         boolean
 338         depends on !NO_DMA
 339         default y
 340
 341 config CHECK_SIGNATURE
 342         bool
 343
 344 config CPUMASK_OFFSTACK
 345         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 346         help
 347           Use dynamic allocation for cpumask_var_t, instead of putting
 348           them on the stack.  This is a bit more expensive, but avoids
 349           stack overflow.
 350
 351 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 352        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 353        depends on BROKEN
 354
 355 config CPU_RMAP
 356         bool
 357         depends on SMP
 358
 359 config DQL
 360         bool
 361
 362 #
 363 # Netlink attribute parsing support is select'ed if needed
 364 #
 365 config NLATTR
 366         bool
 367
 368 #
 369 # Generic 64-bit atomic support is selected if needed
 370 #
 371 config GENERIC_ATOMIC64
 372        bool
 373
 374 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 375         def_bool y if GENERIC_ATOMIC64
 376
 377 config LRU_CACHE
 378         tristate
 379
 380 config AVERAGE
 381         bool "Averaging functions"
 382         help
 383           This option is provided for the case where no in-kernel-tree
 384           modules require averaging functions, but a module built outside
 385           the kernel tree does. Such modules that use library averaging
 386           functions require Y here.
 387
 388           If unsure, say N.
 389
 390 config CLZ_TAB
 391         bool
 392
 393 config CORDIC
 394         tristate "CORDIC algorithm"
 395         help
 396           This option provides an implementation of the CORDIC algorithm;
 397           calculations are in fixed point. Module will be called cordic.
 398
 399 config DDR
 400         bool "JEDEC DDR data"
 401         help
 402           Data from JEDEC specs for DDR SDRAM memories,
 403           particularly the AC timing parameters and addressing
 404           information. This data is useful for drivers handling
 405           DDR SDRAM controllers.
 406
 407 config MPILIB
 408         tristate
 409         select CLZ_TAB
 410         help
 411           Multiprecision maths library from GnuPG.
 412           It is used to implement RSA digital signature verification,
 413           which is used by IMA/EVM digital signature extension.
 414
 415 config SIGNATURE
 416         tristate
 417         depends on KEYS && CRYPTO
 418         select CRYPTO_SHA1
 419         select MPILIB
 420         help
 421           Digital signature verification. Currently only RSA is supported.
 422           Implementation is done using GnuPG MPI library
 423
 424 #
 425 # libfdt files, only selected if needed.
 426 #
 427 config LIBFDT
 428         bool
 429
 430 config OID_REGISTRY
 431         tristate
 432         help
 433           Enable fast lookup object identifier registry.
 434
 435 config UCS2_STRING
 436         tristate
 437
 438 source "lib/fonts/Kconfig"
 439
 440 endmenu