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         select CRYPTO
  70         select CRYPTO_CRCT10DIF
  71         help
  72           This option is only needed if a module that's not in the
  73           kernel tree needs to calculate CRC checks for use with the
  74           SCSI data integrity subsystem.
  75
  76 config CRC_ITU_T
  77         tristate "CRC ITU-T V.41 functions"
  78         help
  79           This option is provided for the case where no in-kernel-tree
  80           modules require CRC ITU-T V.41 functions, but a module built outside
  81           the kernel tree does. Such modules that use library CRC ITU-T V.41
  82           functions require M here.
  83
  84 config CRC32
  85         tristate "CRC32/CRC32c functions"
  86         default y
  87         select BITREVERSE
  88         help
  89           This option is provided for the case where no in-kernel-tree
  90           modules require CRC32/CRC32c functions, but a module built outside
  91           the kernel tree does. Such modules that use library CRC32/CRC32c
  92           functions require M here.
  93
  94 config CRC32_SELFTEST
  95         bool "CRC32 perform self test on init"
  96         default n
  97         depends on CRC32
  98         help
  99           This option enables the CRC32 library functions to perform a
 100           self test on initialization. The self test computes crc32_le
 101           and crc32_be over byte strings with random alignment and length
 102           and computes the total elapsed time and number of bytes processed.
 103
 104 choice
 105         prompt "CRC32 implementation"
 106         depends on CRC32
 107         default CRC32_SLICEBY8
 108         help
 109           This option allows a kernel builder to override the default choice
 110           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
 111           know that you need one of the others.
 112
 113 config CRC32_SLICEBY8
 114         bool "Slice by 8 bytes"
 115         help
 116           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 117           This is the fastest algorithm, but comes with a 8KiB lookup table.
 118           Most modern processors have enough cache to hold this table without
 119           thrashing the cache.
 120
 121           This is the default implementation choice.  Choose this one unless
 122           you have a good reason not to.
 123
 124 config CRC32_SLICEBY4
 125         bool "Slice by 4 bytes"
 126         help
 127           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 128           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 129           table.
 130
 131           Only choose this option if you know what you are doing.
 132
 133 config CRC32_SARWATE
 134         bool "Sarwate's Algorithm (one byte at a time)"
 135         help
 136           Calculate checksum a byte at a time using Sarwate's algorithm.  This
 137           is not particularly fast, but has a small 256 byte lookup table.
 138
 139           Only choose this option if you know what you are doing.
 140
 141 config CRC32_BIT
 142         bool "Classic Algorithm (one bit at a time)"
 143         help
 144           Calculate checksum one bit at a time.  This is VERY slow, but has
 145           no lookup table.  This is provided as a debugging option.
 146
 147           Only choose this option if you are debugging crc32.
 148
 149 endchoice
 150
 151 config CRC7
 152         tristate "CRC7 functions"
 153         help
 154           This option is provided for the case where no in-kernel-tree
 155           modules require CRC7 functions, but a module built outside
 156           the kernel tree does. Such modules that use library CRC7
 157           functions require M here.
 158
 159 config LIBCRC32C
 160         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 161         select CRYPTO
 162         select CRYPTO_CRC32C
 163         help
 164           This option is provided for the case where no in-kernel-tree
 165           modules require CRC32c functions, but a module built outside the
 166           kernel tree does. Such modules that use library CRC32c functions
 167           require M here.  See Castagnoli93.
 168           Module will be libcrc32c.
 169
 170 config CRC8
 171         tristate "CRC8 function"
 172         help
 173           This option provides CRC8 function. Drivers may select this
 174           when they need to do cyclic redundancy check according CRC8
 175           algorithm. Module will be called crc8.
 176
 177 config AUDIT_GENERIC
 178         bool
 179         depends on AUDIT && !AUDIT_ARCH
 180         default y
 181
 182 #
 183 # compression support is select'ed if needed
 184 #
 185 config ZLIB_INFLATE
 186         tristate
 187
 188 config ZLIB_DEFLATE
 189         tristate
 190
 191 config LZO_COMPRESS
 192         tristate
 193
 194 config LZO_DECOMPRESS
 195         tristate
 196
 197 config LZ4_COMPRESS
 198         tristate
 199
 200 config LZ4HC_COMPRESS
 201         tristate
 202
 203 config LZ4_DECOMPRESS
 204         tristate
 205
 206 source "lib/xz/Kconfig"
 207
 208 #
 209 # These all provide a common interface (hence the apparent duplication with
 210 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 211 #
 212 config DECOMPRESS_GZIP
 213         select ZLIB_INFLATE
 214         tristate
 215
 216 config DECOMPRESS_BZIP2
 217         tristate
 218
 219 config DECOMPRESS_LZMA
 220         tristate
 221
 222 config DECOMPRESS_XZ
 223         select XZ_DEC
 224         tristate
 225
 226 config DECOMPRESS_LZO
 227         select LZO_DECOMPRESS
 228         tristate
 229
 230 config DECOMPRESS_LZ4
 231         select LZ4_DECOMPRESS
 232         tristate
 233
 234 #
 235 # Generic allocator support is selected if needed
 236 #
 237 config GENERIC_ALLOCATOR
 238         boolean
 239
 240 #
 241 # reed solomon support is select'ed if needed
 242 #
 243 config REED_SOLOMON
 244         tristate
 245
 246 config REED_SOLOMON_ENC8
 247         boolean
 248
 249 config REED_SOLOMON_DEC8
 250         boolean
 251
 252 config REED_SOLOMON_ENC16
 253         boolean
 254
 255 config REED_SOLOMON_DEC16
 256         boolean
 257
 258 #
 259 # BCH support is selected if needed
 260 #
 261 config BCH
 262         tristate
 263
 264 config BCH_CONST_PARAMS
 265         boolean
 266         help
 267           Drivers may select this option to force specific constant
 268           values for parameters 'm' (Galois field order) and 't'
 269           (error correction capability). Those specific values must
 270           be set by declaring default values for symbols BCH_CONST_M
 271           and BCH_CONST_T.
 272           Doing so will enable extra compiler optimizations,
 273           improving encoding and decoding performance up to 2x for
 274           usual (m,t) values (typically such that m*t < 200).
 275           When this option is selected, the BCH library supports
 276           only a single (m,t) configuration. This is mainly useful
 277           for NAND flash board drivers requiring known, fixed BCH
 278           parameters.
 279
 280 config BCH_CONST_M
 281         int
 282         range 5 15
 283         help
 284           Constant value for Galois field order 'm'. If 'k' is the
 285           number of data bits to protect, 'm' should be chosen such
 286           that (k + m*t) <= 2**m - 1.
 287           Drivers should declare a default value for this symbol if
 288           they select option BCH_CONST_PARAMS.
 289
 290 config BCH_CONST_T
 291         int
 292         help
 293           Constant value for error correction capability in bits 't'.
 294           Drivers should declare a default value for this symbol if
 295           they select option BCH_CONST_PARAMS.
 296
 297 #
 298 # Textsearch support is select'ed if needed
 299 #
 300 config TEXTSEARCH
 301         boolean
 302
 303 config TEXTSEARCH_KMP
 304         tristate
 305
 306 config TEXTSEARCH_BM
 307         tristate
 308
 309 config TEXTSEARCH_FSM
 310         tristate
 311
 312 config BTREE
 313         boolean
 314
 315 config HAS_IOMEM
 316         boolean
 317         depends on !NO_IOMEM
 318         select GENERIC_IO
 319         default y
 320
 321 config HAS_IOPORT
 322         boolean
 323         depends on HAS_IOMEM && !NO_IOPORT
 324         default y
 325
 326 config HAS_DMA
 327         boolean
 328         depends on !NO_DMA
 329         default y
 330
 331 config CHECK_SIGNATURE
 332         bool
 333
 334 config CPUMASK_OFFSTACK
 335         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 336         help
 337           Use dynamic allocation for cpumask_var_t, instead of putting
 338           them on the stack.  This is a bit more expensive, but avoids
 339           stack overflow.
 340
 341 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 342        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 343        depends on BROKEN
 344
 345 config CPU_RMAP
 346         bool
 347         depends on SMP
 348
 349 config DQL
 350         bool
 351
 352 #
 353 # Netlink attribute parsing support is select'ed if needed
 354 #
 355 config NLATTR
 356         bool
 357
 358 #
 359 # Generic 64-bit atomic support is selected if needed
 360 #
 361 config GENERIC_ATOMIC64
 362        bool
 363
 364 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 365         def_bool y if GENERIC_ATOMIC64
 366
 367 config LRU_CACHE
 368         tristate
 369
 370 config AVERAGE
 371         bool "Averaging functions"
 372         help
 373           This option is provided for the case where no in-kernel-tree
 374           modules require averaging functions, but a module built outside
 375           the kernel tree does. Such modules that use library averaging
 376           functions require Y here.
 377
 378           If unsure, say N.
 379
 380 config CLZ_TAB
 381         bool
 382
 383 config CORDIC
 384         tristate "CORDIC algorithm"
 385         help
 386           This option provides an implementation of the CORDIC algorithm;
 387           calculations are in fixed point. Module will be called cordic.
 388
 389 config DDR
 390         bool "JEDEC DDR data"
 391         help
 392           Data from JEDEC specs for DDR SDRAM memories,
 393           particularly the AC timing parameters and addressing
 394           information. This data is useful for drivers handling
 395           DDR SDRAM controllers.
 396
 397 config MPILIB
 398         tristate
 399         select CLZ_TAB
 400         help
 401           Multiprecision maths library from GnuPG.
 402           It is used to implement RSA digital signature verification,
 403           which is used by IMA/EVM digital signature extension.
 404
 405 config SIGNATURE
 406         tristate
 407         depends on KEYS && CRYPTO
 408         select CRYPTO_SHA1
 409         select MPILIB
 410         help
 411           Digital signature verification. Currently only RSA is supported.
 412           Implementation is done using GnuPG MPI library
 413
 414 #
 415 # libfdt files, only selected if needed.
 416 #
 417 config LIBFDT
 418         bool
 419
 420 config OID_REGISTRY
 421         tristate
 422         help
 423           Enable fast lookup object identifier registry.
 424
 425 config UCS2_STRING
 426         tristate
 427
 428 source "lib/fonts/Kconfig"
 429
 430 endmenu