linux/lib/Kconfig
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   1#
   2# Library configuration
   3#
   4
   5config BINARY_PRINTF
   6        def_bool n
   7
   8menu "Library routines"
   9
  10config RAID6_PQ
  11        tristate
  12
  13config BITREVERSE
  14        tristate
  15
  16config RATIONAL
  17        boolean
  18
  19config GENERIC_STRNCPY_FROM_USER
  20        bool
  21
  22config GENERIC_STRNLEN_USER
  23        bool
  24
  25config GENERIC_FIND_FIRST_BIT
  26        bool
  27
  28config NO_GENERIC_PCI_IOPORT_MAP
  29        bool
  30
  31config GENERIC_PCI_IOMAP
  32        bool
  33
  34config GENERIC_IOMAP
  35        bool
  36        select GENERIC_PCI_IOMAP
  37
  38config GENERIC_IO
  39        boolean
  40        default n
  41
  42config STMP_DEVICE
  43        bool
  44
  45config PERCPU_RWSEM
  46        boolean
  47
  48config 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
  56config 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
  64config 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
  71config 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
  79config 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
  89config 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
  99choice
 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
 108config 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
 119config 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
 128config 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
 136config 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
 144endchoice
 145
 146config 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
 154config 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
 165config 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
 172config AUDIT_GENERIC
 173        bool
 174        depends on AUDIT && !AUDIT_ARCH
 175        default y
 176
 177#
 178# compression support is select'ed if needed
 179#
 180config ZLIB_INFLATE
 181        tristate
 182
 183config ZLIB_DEFLATE
 184        tristate
 185
 186config LZO_COMPRESS
 187        tristate
 188
 189config LZO_DECOMPRESS
 190        tristate
 191
 192source "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#
 198config DECOMPRESS_GZIP
 199        select ZLIB_INFLATE
 200        tristate
 201
 202config DECOMPRESS_BZIP2
 203        tristate
 204
 205config DECOMPRESS_LZMA
 206        tristate
 207
 208config DECOMPRESS_XZ
 209        select XZ_DEC
 210        tristate
 211
 212config DECOMPRESS_LZO
 213        select LZO_DECOMPRESS
 214        tristate
 215
 216#
 217# Generic allocator support is selected if needed
 218#
 219config GENERIC_ALLOCATOR
 220        boolean
 221
 222#
 223# reed solomon support is select'ed if needed
 224#
 225config REED_SOLOMON
 226        tristate
 227        
 228config REED_SOLOMON_ENC8
 229        boolean
 230
 231config REED_SOLOMON_DEC8
 232        boolean
 233
 234config REED_SOLOMON_ENC16
 235        boolean
 236
 237config REED_SOLOMON_DEC16
 238        boolean
 239
 240#
 241# BCH support is selected if needed
 242#
 243config BCH
 244        tristate
 245
 246config 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
 262config 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
 272config 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#
 282config TEXTSEARCH
 283        boolean
 284
 285config TEXTSEARCH_KMP
 286        tristate
 287
 288config TEXTSEARCH_BM
 289        tristate
 290
 291config TEXTSEARCH_FSM
 292        tristate
 293
 294config BTREE
 295        boolean
 296
 297config HAS_IOMEM
 298        boolean
 299        depends on !NO_IOMEM
 300        select GENERIC_IO
 301        default y
 302
 303config HAS_IOPORT
 304        boolean
 305        depends on HAS_IOMEM && !NO_IOPORT
 306        default y
 307
 308config HAS_DMA
 309        boolean
 310        depends on !NO_DMA
 311        default y
 312
 313config CHECK_SIGNATURE
 314        bool
 315
 316config 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
 323config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 324       bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 325       depends on EXPERIMENTAL && BROKEN
 326
 327config CPU_RMAP
 328        bool
 329        depends on SMP
 330
 331config DQL
 332        bool
 333
 334#
 335# Netlink attribute parsing support is select'ed if needed
 336#
 337config NLATTR
 338        bool
 339
 340#
 341# Generic 64-bit atomic support is selected if needed
 342#
 343config GENERIC_ATOMIC64
 344       bool
 345
 346config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 347        def_bool y if GENERIC_ATOMIC64
 348
 349config LRU_CACHE
 350        tristate
 351
 352config 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
 362config CLZ_TAB
 363        bool
 364
 365config 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
 371config 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
 379config 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
 387config 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#
 399config LIBFDT
 400        bool
 401
 402config OID_REGISTRY
 403        tristate
 404        help
 405          Enable fast lookup object identifier registry.
 406
 407endmenu
 408
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