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_FIND_FIRST_BIT
  26         bool
  27
  28 config NO_GENERIC_PCI_IOPORT_MAP
  29         bool
  30
  31 config GENERIC_PCI_IOMAP
  32         bool
  33
  34 config GENERIC_IOMAP
  35         bool
  36         select GENERIC_PCI_IOMAP
  37
  38 config GENERIC_IO
  39         boolean
  40         default n
  41
  42 config STMP_DEVICE
  43         bool
  44
  45 config PERCPU_RWSEM
  46         boolean
  47
  48 config CRC_CCITT
  49         tristate "CRC-CCITT functions"
  50         help
  51           This option is provided for the case where no in-kernel-tree
  52           modules require CRC-CCITT functions, but a module built outside
  53           the kernel tree does. Such modules that use library CRC-CCITT
  54           functions require M here.
  55
  56 config CRC16
  57         tristate "CRC16 functions"
  58         help
  59           This option is provided for the case where no in-kernel-tree
  60           modules require CRC16 functions, but a module built outside
  61           the kernel tree does. Such modules that use library CRC16
  62           functions require M here.
  63
  64 config CRC_T10DIF
  65         tristate "CRC calculation for the T10 Data Integrity Field"
  66         help
  67           This option is only needed if a module that's not in the
  68           kernel tree needs to calculate CRC checks for use with the
  69           SCSI data integrity subsystem.
  70
  71 config CRC_ITU_T
  72         tristate "CRC ITU-T V.41 functions"
  73         help
  74           This option is provided for the case where no in-kernel-tree
  75           modules require CRC ITU-T V.41 functions, but a module built outside
  76           the kernel tree does. Such modules that use library CRC ITU-T V.41
  77           functions require M here.
  78
  79 config CRC32
  80         tristate "CRC32/CRC32c functions"
  81         default y
  82         select BITREVERSE
  83         help
  84           This option is provided for the case where no in-kernel-tree
  85           modules require CRC32/CRC32c functions, but a module built outside
  86           the kernel tree does. Such modules that use library CRC32/CRC32c
  87           functions require M here.
  88
  89 config CRC32_SELFTEST
  90         bool "CRC32 perform self test on init"
  91         default n
  92         depends on CRC32
  93         help
  94           This option enables the CRC32 library functions to perform a
  95           self test on initialization. The self test computes crc32_le
  96           and crc32_be over byte strings with random alignment and length
  97           and computes the total elapsed time and number of bytes processed.
  98
  99 choice
 100         prompt "CRC32 implementation"
 101         depends on CRC32
 102         default CRC32_SLICEBY8
 103         help
 104           This option allows a kernel builder to override the default choice
 105           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
 106           know that you need one of the others.
 107
 108 config CRC32_SLICEBY8
 109         bool "Slice by 8 bytes"
 110         help
 111           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 112           This is the fastest algorithm, but comes with a 8KiB lookup table.
 113           Most modern processors have enough cache to hold this table without
 114           thrashing the cache.
 115
 116           This is the default implementation choice.  Choose this one unless
 117           you have a good reason not to.
 118
 119 config CRC32_SLICEBY4
 120         bool "Slice by 4 bytes"
 121         help
 122           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 123           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 124           table.
 125
 126           Only choose this option if you know what you are doing.
 127
 128 config CRC32_SARWATE
 129         bool "Sarwate's Algorithm (one byte at a time)"
 130         help
 131           Calculate checksum a byte at a time using Sarwate's algorithm.  This
 132           is not particularly fast, but has a small 256 byte lookup table.
 133
 134           Only choose this option if you know what you are doing.
 135
 136 config CRC32_BIT
 137         bool "Classic Algorithm (one bit at a time)"
 138         help
 139           Calculate checksum one bit at a time.  This is VERY slow, but has
 140           no lookup table.  This is provided as a debugging option.
 141
 142           Only choose this option if you are debugging crc32.
 143
 144 endchoice
 145
 146 config CRC7
 147         tristate "CRC7 functions"
 148         help
 149           This option is provided for the case where no in-kernel-tree
 150           modules require CRC7 functions, but a module built outside
 151           the kernel tree does. Such modules that use library CRC7
 152           functions require M here.
 153
 154 config LIBCRC32C
 155         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 156         select CRYPTO
 157         select CRYPTO_CRC32C
 158         help
 159           This option is provided for the case where no in-kernel-tree
 160           modules require CRC32c functions, but a module built outside the
 161           kernel tree does. Such modules that use library CRC32c functions
 162           require M here.  See Castagnoli93.
 163           Module will be libcrc32c.
 164
 165 config CRC8
 166         tristate "CRC8 function"
 167         help
 168           This option provides CRC8 function. Drivers may select this
 169           when they need to do cyclic redundancy check according CRC8
 170           algorithm. Module will be called crc8.
 171
 172 config AUDIT_GENERIC
 173         bool
 174         depends on AUDIT && !AUDIT_ARCH
 175         default y
 176
 177 #
 178 # compression support is select'ed if needed
 179 #
 180 config ZLIB_INFLATE
 181         tristate
 182
 183 config ZLIB_DEFLATE
 184         tristate
 185
 186 config LZO_COMPRESS
 187         tristate
 188
 189 config LZO_DECOMPRESS
 190         tristate
 191
 192 config LZ4K
 193         bool "LZ4K compression"
 194         default n
 195
 196 source "lib/xz/Kconfig"
 197
 198 #
 199 # These all provide a common interface (hence the apparent duplication with
 200 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 201 #
 202 config DECOMPRESS_GZIP
 203         select ZLIB_INFLATE
 204         tristate
 205
 206 config DECOMPRESS_BZIP2
 207         tristate
 208
 209 config DECOMPRESS_LZMA
 210         tristate
 211
 212 config DECOMPRESS_XZ
 213         select XZ_DEC
 214         tristate
 215
 216 config DECOMPRESS_LZO
 217         select LZO_DECOMPRESS
 218         tristate
 219
 220 #
 221 # Generic allocator support is selected if needed
 222 #
 223 config GENERIC_ALLOCATOR
 224         boolean
 225
 226 #
 227 # reed solomon support is select'ed if needed
 228 #
 229 config REED_SOLOMON
 230         tristate
 231
 232 config REED_SOLOMON_ENC8
 233         boolean
 234
 235 config REED_SOLOMON_DEC8
 236         boolean
 237
 238 config REED_SOLOMON_ENC16
 239         boolean
 240
 241 config REED_SOLOMON_DEC16
 242         boolean
 243
 244 #
 245 # BCH support is selected if needed
 246 #
 247 config BCH
 248         tristate
 249
 250 config BCH_CONST_PARAMS
 251         boolean
 252         help
 253           Drivers may select this option to force specific constant
 254           values for parameters 'm' (Galois field order) and 't'
 255           (error correction capability). Those specific values must
 256           be set by declaring default values for symbols BCH_CONST_M
 257           and BCH_CONST_T.
 258           Doing so will enable extra compiler optimizations,
 259           improving encoding and decoding performance up to 2x for
 260           usual (m,t) values (typically such that m*t < 200).
 261           When this option is selected, the BCH library supports
 262           only a single (m,t) configuration. This is mainly useful
 263           for NAND flash board drivers requiring known, fixed BCH
 264           parameters.
 265
 266 config BCH_CONST_M
 267         int
 268         range 5 15
 269         help
 270           Constant value for Galois field order 'm'. If 'k' is the
 271           number of data bits to protect, 'm' should be chosen such
 272           that (k + m*t) <= 2**m - 1.
 273           Drivers should declare a default value for this symbol if
 274           they select option BCH_CONST_PARAMS.
 275
 276 config BCH_CONST_T
 277         int
 278         help
 279           Constant value for error correction capability in bits 't'.
 280           Drivers should declare a default value for this symbol if
 281           they select option BCH_CONST_PARAMS.
 282
 283 #
 284 # Textsearch support is select'ed if needed
 285 #
 286 config TEXTSEARCH
 287         boolean
 288
 289 config TEXTSEARCH_KMP
 290         tristate
 291
 292 config TEXTSEARCH_BM
 293         tristate
 294
 295 config TEXTSEARCH_FSM
 296         tristate
 297
 298 config BTREE
 299         boolean
 300
 301 config HAS_IOMEM
 302         boolean
 303         depends on !NO_IOMEM
 304         select GENERIC_IO
 305         default y
 306
 307 config HAS_IOPORT
 308         boolean
 309         depends on HAS_IOMEM && !NO_IOPORT
 310         default y
 311
 312 config HAS_DMA
 313         boolean
 314         depends on !NO_DMA
 315         default y
 316
 317 config CHECK_SIGNATURE
 318         bool
 319
 320 config CPUMASK_OFFSTACK
 321         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 322         help
 323           Use dynamic allocation for cpumask_var_t, instead of putting
 324           them on the stack.  This is a bit more expensive, but avoids
 325           stack overflow.
 326
 327 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 328        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 329        depends on BROKEN
 330
 331 config CPU_RMAP
 332         bool
 333         depends on SMP
 334
 335 config DQL
 336         bool
 337
 338 #
 339 # Netlink attribute parsing support is select'ed if needed
 340 #
 341 config NLATTR
 342         bool
 343
 344 #
 345 # Generic 64-bit atomic support is selected if needed
 346 #
 347 config GENERIC_ATOMIC64
 348        bool
 349
 350 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 351         def_bool y if GENERIC_ATOMIC64
 352
 353 config LRU_CACHE
 354         tristate
 355
 356 config AVERAGE
 357         bool "Averaging functions"
 358         help
 359           This option is provided for the case where no in-kernel-tree
 360           modules require averaging functions, but a module built outside
 361           the kernel tree does. Such modules that use library averaging
 362           functions require Y here.
 363
 364           If unsure, say N.
 365
 366 config CLZ_TAB
 367         bool
 368
 369 config CORDIC
 370         tristate "CORDIC algorithm"
 371         help
 372           This option provides an implementation of the CORDIC algorithm;
 373           calculations are in fixed point. Module will be called cordic.
 374
 375 config DDR
 376         bool "JEDEC DDR data"
 377         help
 378           Data from JEDEC specs for DDR SDRAM memories,
 379           particularly the AC timing parameters and addressing
 380           information. This data is useful for drivers handling
 381           DDR SDRAM controllers.
 382
 383 config MPILIB
 384         tristate
 385         select CLZ_TAB
 386         help
 387           Multiprecision maths library from GnuPG.
 388           It is used to implement RSA digital signature verification,
 389           which is used by IMA/EVM digital signature extension.
 390
 391 config SIGNATURE
 392         tristate
 393         depends on KEYS && CRYPTO
 394         select CRYPTO_SHA1
 395         select MPILIB
 396         help
 397           Digital signature verification. Currently only RSA is supported.
 398           Implementation is done using GnuPG MPI library
 399
 400 #
 401 # libfdt files, only selected if needed.
 402 #
 403 config LIBFDT
 404         bool
 405
 406 config OID_REGISTRY
 407         tristate
 408         help
 409           Enable fast lookup object identifier registry.
 410
 411 config UCS2_STRING
 412         tristate
 413
 414 endmenu