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 HAVE_ARCH_BITREVERSE
  17         bool
  18         default n
  19         depends on BITREVERSE
  20         help
  21           This option enables the use of hardware bit-reversal instructions on
  22           architectures which support such operations.
  23
  24 config RATIONAL
  25         bool
  26
  27 config GENERIC_STRNCPY_FROM_USER
  28         bool
  29
  30 config GENERIC_STRNLEN_USER
  31         bool
  32
  33 config GENERIC_NET_UTILS
  34         bool
  35
  36 config GENERIC_FIND_FIRST_BIT
  37         bool
  38
  39 config NO_GENERIC_PCI_IOPORT_MAP
  40         bool
  41
  42 config GENERIC_PCI_IOMAP
  43         bool
  44
  45 config GENERIC_IOMAP
  46         bool
  47         select GENERIC_PCI_IOMAP
  48
  49 config GENERIC_IO
  50         bool
  51         default n
  52
  53 config STMP_DEVICE
  54         bool
  55
  56 config PERCPU_RWSEM
  57         bool
  58
  59 config ARCH_USE_CMPXCHG_LOCKREF
  60         bool
  61
  62 config ARCH_HAS_FAST_MULTIPLIER
  63         bool
  64
  65 config CRC_CCITT
  66         tristate "CRC-CCITT functions"
  67         help
  68           This option is provided for the case where no in-kernel-tree
  69           modules require CRC-CCITT functions, but a module built outside
  70           the kernel tree does. Such modules that use library CRC-CCITT
  71           functions require M here.
  72
  73 config CRC16
  74         tristate "CRC16 functions"
  75         help
  76           This option is provided for the case where no in-kernel-tree
  77           modules require CRC16 functions, but a module built outside
  78           the kernel tree does. Such modules that use library CRC16
  79           functions require M here.
  80
  81 config CRC_T10DIF
  82         tristate "CRC calculation for the T10 Data Integrity Field"
  83         select CRYPTO
  84         select CRYPTO_CRCT10DIF
  85         help
  86           This option is only needed if a module that's not in the
  87           kernel tree needs to calculate CRC checks for use with the
  88           SCSI data integrity subsystem.
  89
  90 config CRC_ITU_T
  91         tristate "CRC ITU-T V.41 functions"
  92         help
  93           This option is provided for the case where no in-kernel-tree
  94           modules require CRC ITU-T V.41 functions, but a module built outside
  95           the kernel tree does. Such modules that use library CRC ITU-T V.41
  96           functions require M here.
  97
  98 config CRC32
  99         tristate "CRC32/CRC32c functions"
 100         default y
 101         select BITREVERSE
 102         help
 103           This option is provided for the case where no in-kernel-tree
 104           modules require CRC32/CRC32c functions, but a module built outside
 105           the kernel tree does. Such modules that use library CRC32/CRC32c
 106           functions require M here.
 107
 108 config CRC32_SELFTEST
 109         bool "CRC32 perform self test on init"
 110         default n
 111         depends on CRC32
 112         help
 113           This option enables the CRC32 library functions to perform a
 114           self test on initialization. The self test computes crc32_le
 115           and crc32_be over byte strings with random alignment and length
 116           and computes the total elapsed time and number of bytes processed.
 117
 118 choice
 119         prompt "CRC32 implementation"
 120         depends on CRC32
 121         default CRC32_SLICEBY8
 122         help
 123           This option allows a kernel builder to override the default choice
 124           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
 125           know that you need one of the others.
 126
 127 config CRC32_SLICEBY8
 128         bool "Slice by 8 bytes"
 129         help
 130           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 131           This is the fastest algorithm, but comes with a 8KiB lookup table.
 132           Most modern processors have enough cache to hold this table without
 133           thrashing the cache.
 134
 135           This is the default implementation choice.  Choose this one unless
 136           you have a good reason not to.
 137
 138 config CRC32_SLICEBY4
 139         bool "Slice by 4 bytes"
 140         help
 141           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 142           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 143           table.
 144
 145           Only choose this option if you know what you are doing.
 146
 147 config CRC32_SARWATE
 148         bool "Sarwate's Algorithm (one byte at a time)"
 149         help
 150           Calculate checksum a byte at a time using Sarwate's algorithm.  This
 151           is not particularly fast, but has a small 256 byte lookup table.
 152
 153           Only choose this option if you know what you are doing.
 154
 155 config CRC32_BIT
 156         bool "Classic Algorithm (one bit at a time)"
 157         help
 158           Calculate checksum one bit at a time.  This is VERY slow, but has
 159           no lookup table.  This is provided as a debugging option.
 160
 161           Only choose this option if you are debugging crc32.
 162
 163 endchoice
 164
 165 config CRC7
 166         tristate "CRC7 functions"
 167         help
 168           This option is provided for the case where no in-kernel-tree
 169           modules require CRC7 functions, but a module built outside
 170           the kernel tree does. Such modules that use library CRC7
 171           functions require M here.
 172
 173 config LIBCRC32C
 174         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 175         select CRYPTO
 176         select CRYPTO_CRC32C
 177         help
 178           This option is provided for the case where no in-kernel-tree
 179           modules require CRC32c functions, but a module built outside the
 180           kernel tree does. Such modules that use library CRC32c functions
 181           require M here.  See Castagnoli93.
 182           Module will be libcrc32c.
 183
 184 config CRC8
 185         tristate "CRC8 function"
 186         help
 187           This option provides CRC8 function. Drivers may select this
 188           when they need to do cyclic redundancy check according CRC8
 189           algorithm. Module will be called crc8.
 190
 191 config AUDIT_GENERIC
 192         bool
 193         depends on AUDIT && !AUDIT_ARCH
 194         default y
 195
 196 config AUDIT_ARCH_COMPAT_GENERIC
 197         bool
 198         default n
 199
 200 config AUDIT_COMPAT_GENERIC
 201         bool
 202         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
 203         default y
 204
 205 config RANDOM32_SELFTEST
 206         bool "PRNG perform self test on init"
 207         default n
 208         help
 209           This option enables the 32 bit PRNG library functions to perform a
 210           self test on initialization.
 211
 212 #
 213 # compression support is select'ed if needed
 214 #
 215 config ZLIB_INFLATE
 216         tristate
 217
 218 config ZLIB_DEFLATE
 219         tristate
 220
 221 config LZO_COMPRESS
 222         tristate
 223
 224 config LZO_DECOMPRESS
 225         tristate
 226
 227 config LZ4_COMPRESS
 228         tristate
 229
 230 config LZ4HC_COMPRESS
 231         tristate
 232
 233 config LZ4_DECOMPRESS
 234         tristate
 235
 236 source "lib/xz/Kconfig"
 237
 238 #
 239 # These all provide a common interface (hence the apparent duplication with
 240 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 241 #
 242 config DECOMPRESS_GZIP
 243         select ZLIB_INFLATE
 244         tristate
 245
 246 config DECOMPRESS_BZIP2
 247         tristate
 248
 249 config DECOMPRESS_LZMA
 250         tristate
 251
 252 config DECOMPRESS_XZ
 253         select XZ_DEC
 254         tristate
 255
 256 config DECOMPRESS_LZO
 257         select LZO_DECOMPRESS
 258         tristate
 259
 260 config DECOMPRESS_LZ4
 261         select LZ4_DECOMPRESS
 262         tristate
 263
 264 #
 265 # Generic allocator support is selected if needed
 266 #
 267 config GENERIC_ALLOCATOR
 268         bool
 269
 270 #
 271 # reed solomon support is select'ed if needed
 272 #
 273 config REED_SOLOMON
 274         tristate
 275
 276 config REED_SOLOMON_ENC8
 277         bool
 278
 279 config REED_SOLOMON_DEC8
 280         bool
 281
 282 config REED_SOLOMON_ENC16
 283         bool
 284
 285 config REED_SOLOMON_DEC16
 286         bool
 287
 288 #
 289 # BCH support is selected if needed
 290 #
 291 config BCH
 292         tristate
 293
 294 config BCH_CONST_PARAMS
 295         bool
 296         help
 297           Drivers may select this option to force specific constant
 298           values for parameters 'm' (Galois field order) and 't'
 299           (error correction capability). Those specific values must
 300           be set by declaring default values for symbols BCH_CONST_M
 301           and BCH_CONST_T.
 302           Doing so will enable extra compiler optimizations,
 303           improving encoding and decoding performance up to 2x for
 304           usual (m,t) values (typically such that m*t < 200).
 305           When this option is selected, the BCH library supports
 306           only a single (m,t) configuration. This is mainly useful
 307           for NAND flash board drivers requiring known, fixed BCH
 308           parameters.
 309
 310 config BCH_CONST_M
 311         int
 312         range 5 15
 313         help
 314           Constant value for Galois field order 'm'. If 'k' is the
 315           number of data bits to protect, 'm' should be chosen such
 316           that (k + m*t) <= 2**m - 1.
 317           Drivers should declare a default value for this symbol if
 318           they select option BCH_CONST_PARAMS.
 319
 320 config BCH_CONST_T
 321         int
 322         help
 323           Constant value for error correction capability in bits 't'.
 324           Drivers should declare a default value for this symbol if
 325           they select option BCH_CONST_PARAMS.
 326
 327 #
 328 # Textsearch support is select'ed if needed
 329 #
 330 config TEXTSEARCH
 331         bool
 332
 333 config TEXTSEARCH_KMP
 334         tristate
 335
 336 config TEXTSEARCH_BM
 337         tristate
 338
 339 config TEXTSEARCH_FSM
 340         tristate
 341
 342 config BTREE
 343         bool
 344
 345 config INTERVAL_TREE
 346         bool
 347         help
 348           Simple, embeddable, interval-tree. Can find the start of an
 349           overlapping range in log(n) time and then iterate over all
 350           overlapping nodes. The algorithm is implemented as an
 351           augmented rbtree.
 352
 353           See:
 354
 355                 Documentation/rbtree.txt
 356
 357           for more information.
 358
 359 config ASSOCIATIVE_ARRAY
 360         bool
 361         help
 362           Generic associative array.  Can be searched and iterated over whilst
 363           it is being modified.  It is also reasonably quick to search and
 364           modify.  The algorithms are non-recursive, and the trees are highly
 365           capacious.
 366
 367           See:
 368
 369                 Documentation/assoc_array.txt
 370
 371           for more information.
 372
 373 config HAS_IOMEM
 374         bool
 375         depends on !NO_IOMEM
 376         select GENERIC_IO
 377         default y
 378
 379 config HAS_IOPORT_MAP
 380         bool
 381         depends on HAS_IOMEM && !NO_IOPORT_MAP
 382         default y
 383
 384 config HAS_DMA
 385         bool
 386         depends on !NO_DMA
 387         default y
 388
 389 config CHECK_SIGNATURE
 390         bool
 391
 392 config CPUMASK_OFFSTACK
 393         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 394         help
 395           Use dynamic allocation for cpumask_var_t, instead of putting
 396           them on the stack.  This is a bit more expensive, but avoids
 397           stack overflow.
 398
 399 config CPU_RMAP
 400         bool
 401         depends on SMP
 402
 403 config DQL
 404         bool
 405
 406 config GLOB
 407         bool
 408 #       This actually supports modular compilation, but the module overhead
 409 #       is ridiculous for the amount of code involved.  Until an out-of-tree
 410 #       driver asks for it, we'll just link it directly it into the kernel
 411 #       when required.  Since we're ignoring out-of-tree users, there's also
 412 #       no need bother prompting for a manual decision:
 413 #       prompt "glob_match() function"
 414         help
 415           This option provides a glob_match function for performing
 416           simple text pattern matching.  It originated in the ATA code
 417           to blacklist particular drive models, but other device drivers
 418           may need similar functionality.
 419
 420           All drivers in the Linux kernel tree that require this function
 421           should automatically select this option.  Say N unless you
 422           are compiling an out-of tree driver which tells you that it
 423           depends on this.
 424
 425 config GLOB_SELFTEST
 426         bool "glob self-test on init"
 427         default n
 428         depends on GLOB
 429         help
 430           This option enables a simple self-test of the glob_match
 431           function on startup.  It is primarily useful for people
 432           working on the code to ensure they haven't introduced any
 433           regressions.
 434
 435           It only adds a little bit of code and slows kernel boot (or
 436           module load) by a small amount, so you're welcome to play with
 437           it, but you probably don't need it.
 438
 439 #
 440 # Netlink attribute parsing support is select'ed if needed
 441 #
 442 config NLATTR
 443         bool
 444
 445 #
 446 # Generic 64-bit atomic support is selected if needed
 447 #
 448 config GENERIC_ATOMIC64
 449        bool
 450
 451 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 452         def_bool y if GENERIC_ATOMIC64
 453
 454 config LRU_CACHE
 455         tristate
 456
 457 config AVERAGE
 458         bool "Averaging functions"
 459         help
 460           This option is provided for the case where no in-kernel-tree
 461           modules require averaging functions, but a module built outside
 462           the kernel tree does. Such modules that use library averaging
 463           functions require Y here.
 464
 465           If unsure, say N.
 466
 467 config CLZ_TAB
 468         bool
 469
 470 config CORDIC
 471         tristate "CORDIC algorithm"
 472         help
 473           This option provides an implementation of the CORDIC algorithm;
 474           calculations are in fixed point. Module will be called cordic.
 475
 476 config DDR
 477         bool "JEDEC DDR data"
 478         help
 479           Data from JEDEC specs for DDR SDRAM memories,
 480           particularly the AC timing parameters and addressing
 481           information. This data is useful for drivers handling
 482           DDR SDRAM controllers.
 483
 484 config MPILIB
 485         tristate
 486         select CLZ_TAB
 487         help
 488           Multiprecision maths library from GnuPG.
 489           It is used to implement RSA digital signature verification,
 490           which is used by IMA/EVM digital signature extension.
 491
 492 config SIGNATURE
 493         tristate
 494         depends on KEYS
 495         select CRYPTO
 496         select CRYPTO_SHA1
 497         select MPILIB
 498         help
 499           Digital signature verification. Currently only RSA is supported.
 500           Implementation is done using GnuPG MPI library
 501
 502 #
 503 # libfdt files, only selected if needed.
 504 #
 505 config LIBFDT
 506         bool
 507
 508 config OID_REGISTRY
 509         tristate
 510         help
 511           Enable fast lookup object identifier registry.
 512
 513 config UCS2_STRING
 514         tristate
 515
 516 source "lib/fonts/Kconfig"
 517
 518 #
 519 # sg chaining option
 520 #
 521
 522 config ARCH_HAS_SG_CHAIN
 523         def_bool n
 524
 525 endmenu