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 source "lib/xz/Kconfig"
 196
 197 #
 198 # These all provide a common interface (hence the apparent duplication with
 199 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 200 #
 201 config DECOMPRESS_GZIP
 202         select ZLIB_INFLATE
 203         tristate
 204
 205 config DECOMPRESS_BZIP2
 206         tristate
 207
 208 config DECOMPRESS_LZMA
 209         tristate
 210
 211 config DECOMPRESS_XZ
 212         select XZ_DEC
 213         tristate
 214
 215 config DECOMPRESS_LZO
 216         select LZO_DECOMPRESS
 217         tristate
 218
 219 #
 220 # Generic allocator support is selected if needed
 221 #
 222 config GENERIC_ALLOCATOR
 223         boolean
 224
 225 #
 226 # reed solomon support is select'ed if needed
 227 #
 228 config REED_SOLOMON
 229         tristate
 230
 231 config REED_SOLOMON_ENC8
 232         boolean
 233
 234 config REED_SOLOMON_DEC8
 235         boolean
 236
 237 config REED_SOLOMON_ENC16
 238         boolean
 239
 240 config REED_SOLOMON_DEC16
 241         boolean
 242
 243 #
 244 # BCH support is selected if needed
 245 #
 246 config BCH
 247         tristate
 248
 249 config BCH_CONST_PARAMS
 250         boolean
 251         help
 252           Drivers may select this option to force specific constant
 253           values for parameters 'm' (Galois field order) and 't'
 254           (error correction capability). Those specific values must
 255           be set by declaring default values for symbols BCH_CONST_M
 256           and BCH_CONST_T.
 257           Doing so will enable extra compiler optimizations,
 258           improving encoding and decoding performance up to 2x for
 259           usual (m,t) values (typically such that m*t < 200).
 260           When this option is selected, the BCH library supports
 261           only a single (m,t) configuration. This is mainly useful
 262           for NAND flash board drivers requiring known, fixed BCH
 263           parameters.
 264
 265 config BCH_CONST_M
 266         int
 267         range 5 15
 268         help
 269           Constant value for Galois field order 'm'. If 'k' is the
 270           number of data bits to protect, 'm' should be chosen such
 271           that (k + m*t) <= 2**m - 1.
 272           Drivers should declare a default value for this symbol if
 273           they select option BCH_CONST_PARAMS.
 274
 275 config BCH_CONST_T
 276         int
 277         help
 278           Constant value for error correction capability in bits 't'.
 279           Drivers should declare a default value for this symbol if
 280           they select option BCH_CONST_PARAMS.
 281
 282 #
 283 # Textsearch support is select'ed if needed
 284 #
 285 config TEXTSEARCH
 286         boolean
 287
 288 config TEXTSEARCH_KMP
 289         tristate
 290
 291 config TEXTSEARCH_BM
 292         tristate
 293
 294 config TEXTSEARCH_FSM
 295         tristate
 296
 297 config BTREE
 298         boolean
 299
 300 config HAS_IOMEM
 301         boolean
 302         depends on !NO_IOMEM
 303         select GENERIC_IO
 304         default y
 305
 306 config HAS_IOPORT
 307         boolean
 308         depends on HAS_IOMEM && !NO_IOPORT
 309         default y
 310
 311 config HAS_DMA
 312         boolean
 313         depends on !NO_DMA
 314         default y
 315
 316 config CHECK_SIGNATURE
 317         bool
 318
 319 config CPUMASK_OFFSTACK
 320         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 321         help
 322           Use dynamic allocation for cpumask_var_t, instead of putting
 323           them on the stack.  This is a bit more expensive, but avoids
 324           stack overflow.
 325
 326 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 327        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 328        depends on BROKEN
 329
 330 config CPU_RMAP
 331         bool
 332         depends on SMP
 333
 334 config DQL
 335         bool
 336
 337 #
 338 # Netlink attribute parsing support is select'ed if needed
 339 #
 340 config NLATTR
 341         bool
 342
 343 #
 344 # Generic 64-bit atomic support is selected if needed
 345 #
 346 config GENERIC_ATOMIC64
 347        bool
 348
 349 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 350         def_bool y if GENERIC_ATOMIC64
 351
 352 config LRU_CACHE
 353         tristate
 354
 355 config AVERAGE
 356         bool "Averaging functions"
 357         help
 358           This option is provided for the case where no in-kernel-tree
 359           modules require averaging functions, but a module built outside
 360           the kernel tree does. Such modules that use library averaging
 361           functions require Y here.
 362
 363           If unsure, say N.
 364
 365 config CLZ_TAB
 366         bool
 367
 368 config CORDIC
 369         tristate "CORDIC algorithm"
 370         help
 371           This option provides an implementation of the CORDIC algorithm;
 372           calculations are in fixed point. Module will be called cordic.
 373
 374 config DDR
 375         bool "JEDEC DDR data"
 376         help
 377           Data from JEDEC specs for DDR SDRAM memories,
 378           particularly the AC timing parameters and addressing
 379           information. This data is useful for drivers handling
 380           DDR SDRAM controllers.
 381
 382 config MPILIB
 383         tristate
 384         select CLZ_TAB
 385         help
 386           Multiprecision maths library from GnuPG.
 387           It is used to implement RSA digital signature verification,
 388           which is used by IMA/EVM digital signature extension.
 389
 390 config SIGNATURE
 391         tristate
 392         depends on KEYS && CRYPTO
 393         select CRYPTO_SHA1
 394         select MPILIB
 395         help
 396           Digital signature verification. Currently only RSA is supported.
 397           Implementation is done using GnuPG MPI library
 398
 399 #
 400 # libfdt files, only selected if needed.
 401 #
 402 config LIBFDT
 403         bool
 404
 405 config OID_REGISTRY
 406         tristate
 407         help
 408           Enable fast lookup object identifier registry.
 409
 410 config UCS2_STRING
 411         tristate
 412
 413 endmenu