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