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