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 842_COMPRESS
 216         tristate
 217
 218 config 842_DECOMPRESS
 219         tristate
 220
 221 config ZLIB_INFLATE
 222         tristate
 223
 224 config ZLIB_DEFLATE
 225         tristate
 226
 227 config LZO_COMPRESS
 228         tristate
 229
 230 config LZO_DECOMPRESS
 231         tristate
 232
 233 config LZ4_COMPRESS
 234         tristate
 235
 236 config LZ4HC_COMPRESS
 237         tristate
 238
 239 config LZ4_DECOMPRESS
 240         tristate
 241
 242 source "lib/xz/Kconfig"
 243
 244 #
 245 # These all provide a common interface (hence the apparent duplication with
 246 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 247 #
 248 config DECOMPRESS_GZIP
 249         select ZLIB_INFLATE
 250         tristate
 251
 252 config DECOMPRESS_BZIP2
 253         tristate
 254
 255 config DECOMPRESS_LZMA
 256         tristate
 257
 258 config DECOMPRESS_XZ
 259         select XZ_DEC
 260         tristate
 261
 262 config DECOMPRESS_LZO
 263         select LZO_DECOMPRESS
 264         tristate
 265
 266 config DECOMPRESS_LZ4
 267         select LZ4_DECOMPRESS
 268         tristate
 269
 270 #
 271 # Generic allocator support is selected if needed
 272 #
 273 config GENERIC_ALLOCATOR
 274         bool
 275
 276 #
 277 # reed solomon support is select'ed if needed
 278 #
 279 config REED_SOLOMON
 280         tristate
 281
 282 config REED_SOLOMON_ENC8
 283         bool
 284
 285 config REED_SOLOMON_DEC8
 286         bool
 287
 288 config REED_SOLOMON_ENC16
 289         bool
 290
 291 config REED_SOLOMON_DEC16
 292         bool
 293
 294 #
 295 # BCH support is selected if needed
 296 #
 297 config BCH
 298         tristate
 299
 300 config BCH_CONST_PARAMS
 301         bool
 302         help
 303           Drivers may select this option to force specific constant
 304           values for parameters 'm' (Galois field order) and 't'
 305           (error correction capability). Those specific values must
 306           be set by declaring default values for symbols BCH_CONST_M
 307           and BCH_CONST_T.
 308           Doing so will enable extra compiler optimizations,
 309           improving encoding and decoding performance up to 2x for
 310           usual (m,t) values (typically such that m*t < 200).
 311           When this option is selected, the BCH library supports
 312           only a single (m,t) configuration. This is mainly useful
 313           for NAND flash board drivers requiring known, fixed BCH
 314           parameters.
 315
 316 config BCH_CONST_M
 317         int
 318         range 5 15
 319         help
 320           Constant value for Galois field order 'm'. If 'k' is the
 321           number of data bits to protect, 'm' should be chosen such
 322           that (k + m*t) <= 2**m - 1.
 323           Drivers should declare a default value for this symbol if
 324           they select option BCH_CONST_PARAMS.
 325
 326 config BCH_CONST_T
 327         int
 328         help
 329           Constant value for error correction capability in bits 't'.
 330           Drivers should declare a default value for this symbol if
 331           they select option BCH_CONST_PARAMS.
 332
 333 #
 334 # Textsearch support is select'ed if needed
 335 #
 336 config TEXTSEARCH
 337         bool
 338
 339 config TEXTSEARCH_KMP
 340         tristate
 341
 342 config TEXTSEARCH_BM
 343         tristate
 344
 345 config TEXTSEARCH_FSM
 346         tristate
 347
 348 config BTREE
 349         bool
 350
 351 config INTERVAL_TREE
 352         bool
 353         help
 354           Simple, embeddable, interval-tree. Can find the start of an
 355           overlapping range in log(n) time and then iterate over all
 356           overlapping nodes. The algorithm is implemented as an
 357           augmented rbtree.
 358
 359           See:
 360
 361                 Documentation/rbtree.txt
 362
 363           for more information.
 364
 365 config ASSOCIATIVE_ARRAY
 366         bool
 367         help
 368           Generic associative array.  Can be searched and iterated over whilst
 369           it is being modified.  It is also reasonably quick to search and
 370           modify.  The algorithms are non-recursive, and the trees are highly
 371           capacious.
 372
 373           See:
 374
 375                 Documentation/assoc_array.txt
 376
 377           for more information.
 378
 379 config HAS_IOMEM
 380         bool
 381         depends on !NO_IOMEM
 382         select GENERIC_IO
 383         default y
 384
 385 config HAS_IOPORT_MAP
 386         bool
 387         depends on HAS_IOMEM && !NO_IOPORT_MAP
 388         default y
 389
 390 config HAS_DMA
 391         bool
 392         depends on !NO_DMA
 393         default y
 394
 395 config CHECK_SIGNATURE
 396         bool
 397
 398 config CPUMASK_OFFSTACK
 399         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 400         help
 401           Use dynamic allocation for cpumask_var_t, instead of putting
 402           them on the stack.  This is a bit more expensive, but avoids
 403           stack overflow.
 404
 405 config CPU_RMAP
 406         bool
 407         depends on SMP
 408
 409 config DQL
 410         bool
 411
 412 config GLOB
 413         bool
 414 #       This actually supports modular compilation, but the module overhead
 415 #       is ridiculous for the amount of code involved.  Until an out-of-tree
 416 #       driver asks for it, we'll just link it directly it into the kernel
 417 #       when required.  Since we're ignoring out-of-tree users, there's also
 418 #       no need bother prompting for a manual decision:
 419 #       prompt "glob_match() function"
 420         help
 421           This option provides a glob_match function for performing
 422           simple text pattern matching.  It originated in the ATA code
 423           to blacklist particular drive models, but other device drivers
 424           may need similar functionality.
 425
 426           All drivers in the Linux kernel tree that require this function
 427           should automatically select this option.  Say N unless you
 428           are compiling an out-of tree driver which tells you that it
 429           depends on this.
 430
 431 config GLOB_SELFTEST
 432         bool "glob self-test on init"
 433         default n
 434         depends on GLOB
 435         help
 436           This option enables a simple self-test of the glob_match
 437           function on startup.  It is primarily useful for people
 438           working on the code to ensure they haven't introduced any
 439           regressions.
 440
 441           It only adds a little bit of code and slows kernel boot (or
 442           module load) by a small amount, so you're welcome to play with
 443           it, but you probably don't need it.
 444
 445 #
 446 # Netlink attribute parsing support is select'ed if needed
 447 #
 448 config NLATTR
 449         bool
 450
 451 #
 452 # Generic 64-bit atomic support is selected if needed
 453 #
 454 config GENERIC_ATOMIC64
 455        bool
 456
 457 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 458         def_bool y if GENERIC_ATOMIC64
 459
 460 config LRU_CACHE
 461         tristate
 462
 463 config AVERAGE
 464         bool "Averaging functions"
 465         help
 466           This option is provided for the case where no in-kernel-tree
 467           modules require averaging functions, but a module built outside
 468           the kernel tree does. Such modules that use library averaging
 469           functions require Y here.
 470
 471           If unsure, say N.
 472
 473 config CLZ_TAB
 474         bool
 475
 476 config CORDIC
 477         tristate "CORDIC algorithm"
 478         help
 479           This option provides an implementation of the CORDIC algorithm;
 480           calculations are in fixed point. Module will be called cordic.
 481
 482 config DDR
 483         bool "JEDEC DDR data"
 484         help
 485           Data from JEDEC specs for DDR SDRAM memories,
 486           particularly the AC timing parameters and addressing
 487           information. This data is useful for drivers handling
 488           DDR SDRAM controllers.
 489
 490 config MPILIB
 491         tristate
 492         select CLZ_TAB
 493         help
 494           Multiprecision maths library from GnuPG.
 495           It is used to implement RSA digital signature verification,
 496           which is used by IMA/EVM digital signature extension.
 497
 498 config SIGNATURE
 499         tristate
 500         depends on KEYS
 501         select CRYPTO
 502         select CRYPTO_SHA1
 503         select MPILIB
 504         help
 505           Digital signature verification. Currently only RSA is supported.
 506           Implementation is done using GnuPG MPI library
 507
 508 #
 509 # libfdt files, only selected if needed.
 510 #
 511 config LIBFDT
 512         bool
 513
 514 config OID_REGISTRY
 515         tristate
 516         help
 517           Enable fast lookup object identifier registry.
 518
 519 config UCS2_STRING
 520         tristate
 521
 522 source "lib/fonts/Kconfig"
 523
 524 #
 525 # sg chaining option
 526 #
 527
 528 config ARCH_HAS_SG_CHAIN
 529         def_bool n
 530
 531 config ARCH_HAS_PMEM_API
 532         bool
 533
 534 endmenu