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 ARCH_USE_CMPXCHG_LOCKREF
  57         bool
  58
  59 config ARCH_HAS_FAST_MULTIPLIER
  60         bool
  61
  62 config CRC_CCITT
  63         tristate "CRC-CCITT functions"
  64         help
  65           This option is provided for the case where no in-kernel-tree
  66           modules require CRC-CCITT functions, but a module built outside
  67           the kernel tree does. Such modules that use library CRC-CCITT
  68           functions require M here.
  69
  70 config CRC16
  71         tristate "CRC16 functions"
  72         help
  73           This option is provided for the case where no in-kernel-tree
  74           modules require CRC16 functions, but a module built outside
  75           the kernel tree does. Such modules that use library CRC16
  76           functions require M here.
  77
  78 config CRC_T10DIF
  79         tristate "CRC calculation for the T10 Data Integrity Field"
  80         select CRYPTO
  81         select CRYPTO_CRCT10DIF
  82         help
  83           This option is only needed if a module that's not in the
  84           kernel tree needs to calculate CRC checks for use with the
  85           SCSI data integrity subsystem.
  86
  87 config CRC_ITU_T
  88         tristate "CRC ITU-T V.41 functions"
  89         help
  90           This option is provided for the case where no in-kernel-tree
  91           modules require CRC ITU-T V.41 functions, but a module built outside
  92           the kernel tree does. Such modules that use library CRC ITU-T V.41
  93           functions require M here.
  94
  95 config CRC32
  96         tristate "CRC32/CRC32c functions"
  97         default y
  98         select BITREVERSE
  99         help
 100           This option is provided for the case where no in-kernel-tree
 101           modules require CRC32/CRC32c functions, but a module built outside
 102           the kernel tree does. Such modules that use library CRC32/CRC32c
 103           functions require M here.
 104
 105 config CRC32_SELFTEST
 106         bool "CRC32 perform self test on init"
 107         default n
 108         depends on CRC32
 109         help
 110           This option enables the CRC32 library functions to perform a
 111           self test on initialization. The self test computes crc32_le
 112           and crc32_be over byte strings with random alignment and length
 113           and computes the total elapsed time and number of bytes processed.
 114
 115 choice
 116         prompt "CRC32 implementation"
 117         depends on CRC32
 118         default CRC32_SLICEBY8
 119         help
 120           This option allows a kernel builder to override the default choice
 121           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
 122           know that you need one of the others.
 123
 124 config CRC32_SLICEBY8
 125         bool "Slice by 8 bytes"
 126         help
 127           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 128           This is the fastest algorithm, but comes with a 8KiB lookup table.
 129           Most modern processors have enough cache to hold this table without
 130           thrashing the cache.
 131
 132           This is the default implementation choice.  Choose this one unless
 133           you have a good reason not to.
 134
 135 config CRC32_SLICEBY4
 136         bool "Slice by 4 bytes"
 137         help
 138           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 139           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 140           table.
 141
 142           Only choose this option if you know what you are doing.
 143
 144 config CRC32_SARWATE
 145         bool "Sarwate's Algorithm (one byte at a time)"
 146         help
 147           Calculate checksum a byte at a time using Sarwate's algorithm.  This
 148           is not particularly fast, but has a small 256 byte lookup table.
 149
 150           Only choose this option if you know what you are doing.
 151
 152 config CRC32_BIT
 153         bool "Classic Algorithm (one bit at a time)"
 154         help
 155           Calculate checksum one bit at a time.  This is VERY slow, but has
 156           no lookup table.  This is provided as a debugging option.
 157
 158           Only choose this option if you are debugging crc32.
 159
 160 endchoice
 161
 162 config CRC7
 163         tristate "CRC7 functions"
 164         help
 165           This option is provided for the case where no in-kernel-tree
 166           modules require CRC7 functions, but a module built outside
 167           the kernel tree does. Such modules that use library CRC7
 168           functions require M here.
 169
 170 config LIBCRC32C
 171         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 172         select CRYPTO
 173         select CRYPTO_CRC32C
 174         help
 175           This option is provided for the case where no in-kernel-tree
 176           modules require CRC32c functions, but a module built outside the
 177           kernel tree does. Such modules that use library CRC32c functions
 178           require M here.  See Castagnoli93.
 179           Module will be libcrc32c.
 180
 181 config CRC8
 182         tristate "CRC8 function"
 183         help
 184           This option provides CRC8 function. Drivers may select this
 185           when they need to do cyclic redundancy check according CRC8
 186           algorithm. Module will be called crc8.
 187
 188 config AUDIT_GENERIC
 189         bool
 190         depends on AUDIT && !AUDIT_ARCH
 191         default y
 192
 193 config AUDIT_ARCH_COMPAT_GENERIC
 194         bool
 195         default n
 196
 197 config AUDIT_COMPAT_GENERIC
 198         bool
 199         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
 200         default y
 201
 202 config RANDOM32_SELFTEST
 203         bool "PRNG perform self test on init"
 204         default n
 205         help
 206           This option enables the 32 bit PRNG library functions to perform a
 207           self test on initialization.
 208
 209 #
 210 # compression support is select'ed if needed
 211 #
 212 config 842_COMPRESS
 213         tristate
 214
 215 config 842_DECOMPRESS
 216         tristate
 217
 218 config ZLIB_INFLATE
 219         tristate
 220
 221 config ZLIB_DEFLATE
 222         tristate
 223
 224 config LZO_COMPRESS
 225         tristate
 226
 227 config LZO_DECOMPRESS
 228         tristate
 229
 230 config LZ4_COMPRESS
 231         tristate
 232
 233 config LZ4HC_COMPRESS
 234         tristate
 235
 236 config LZ4_DECOMPRESS
 237         tristate
 238
 239 source "lib/xz/Kconfig"
 240
 241 #
 242 # These all provide a common interface (hence the apparent duplication with
 243 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 244 #
 245 config DECOMPRESS_GZIP
 246         select ZLIB_INFLATE
 247         tristate
 248
 249 config DECOMPRESS_BZIP2
 250         tristate
 251
 252 config DECOMPRESS_LZMA
 253         tristate
 254
 255 config DECOMPRESS_XZ
 256         select XZ_DEC
 257         tristate
 258
 259 config DECOMPRESS_LZO
 260         select LZO_DECOMPRESS
 261         tristate
 262
 263 config DECOMPRESS_LZ4
 264         select LZ4_DECOMPRESS
 265         tristate
 266
 267 #
 268 # Generic allocator support is selected if needed
 269 #
 270 config GENERIC_ALLOCATOR
 271         bool
 272
 273 #
 274 # reed solomon support is select'ed if needed
 275 #
 276 config REED_SOLOMON
 277         tristate
 278
 279 config REED_SOLOMON_ENC8
 280         bool
 281
 282 config REED_SOLOMON_DEC8
 283         bool
 284
 285 config REED_SOLOMON_ENC16
 286         bool
 287
 288 config REED_SOLOMON_DEC16
 289         bool
 290
 291 #
 292 # BCH support is selected if needed
 293 #
 294 config BCH
 295         tristate
 296
 297 config BCH_CONST_PARAMS
 298         bool
 299         help
 300           Drivers may select this option to force specific constant
 301           values for parameters 'm' (Galois field order) and 't'
 302           (error correction capability). Those specific values must
 303           be set by declaring default values for symbols BCH_CONST_M
 304           and BCH_CONST_T.
 305           Doing so will enable extra compiler optimizations,
 306           improving encoding and decoding performance up to 2x for
 307           usual (m,t) values (typically such that m*t < 200).
 308           When this option is selected, the BCH library supports
 309           only a single (m,t) configuration. This is mainly useful
 310           for NAND flash board drivers requiring known, fixed BCH
 311           parameters.
 312
 313 config BCH_CONST_M
 314         int
 315         range 5 15
 316         help
 317           Constant value for Galois field order 'm'. If 'k' is the
 318           number of data bits to protect, 'm' should be chosen such
 319           that (k + m*t) <= 2**m - 1.
 320           Drivers should declare a default value for this symbol if
 321           they select option BCH_CONST_PARAMS.
 322
 323 config BCH_CONST_T
 324         int
 325         help
 326           Constant value for error correction capability in bits 't'.
 327           Drivers should declare a default value for this symbol if
 328           they select option BCH_CONST_PARAMS.
 329
 330 #
 331 # Textsearch support is select'ed if needed
 332 #
 333 config TEXTSEARCH
 334         bool
 335
 336 config TEXTSEARCH_KMP
 337         tristate
 338
 339 config TEXTSEARCH_BM
 340         tristate
 341
 342 config TEXTSEARCH_FSM
 343         tristate
 344
 345 config BTREE
 346         bool
 347
 348 config INTERVAL_TREE
 349         bool
 350         help
 351           Simple, embeddable, interval-tree. Can find the start of an
 352           overlapping range in log(n) time and then iterate over all
 353           overlapping nodes. The algorithm is implemented as an
 354           augmented rbtree.
 355
 356           See:
 357
 358                 Documentation/rbtree.txt
 359
 360           for more information.
 361
 362 config ASSOCIATIVE_ARRAY
 363         bool
 364         help
 365           Generic associative array.  Can be searched and iterated over whilst
 366           it is being modified.  It is also reasonably quick to search and
 367           modify.  The algorithms are non-recursive, and the trees are highly
 368           capacious.
 369
 370           See:
 371
 372                 Documentation/assoc_array.txt
 373
 374           for more information.
 375
 376 config HAS_IOMEM
 377         bool
 378         depends on !NO_IOMEM
 379         select GENERIC_IO
 380         default y
 381
 382 config HAS_IOPORT_MAP
 383         bool
 384         depends on HAS_IOMEM && !NO_IOPORT_MAP
 385         default y
 386
 387 config HAS_DMA
 388         bool
 389         depends on !NO_DMA
 390         default y
 391
 392 config CHECK_SIGNATURE
 393         bool
 394
 395 config CPUMASK_OFFSTACK
 396         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 397         help
 398           Use dynamic allocation for cpumask_var_t, instead of putting
 399           them on the stack.  This is a bit more expensive, but avoids
 400           stack overflow.
 401
 402 config CPU_RMAP
 403         bool
 404         depends on SMP
 405
 406 config DQL
 407         bool
 408
 409 config GLOB
 410         bool
 411 #       This actually supports modular compilation, but the module overhead
 412 #       is ridiculous for the amount of code involved.  Until an out-of-tree
 413 #       driver asks for it, we'll just link it directly it into the kernel
 414 #       when required.  Since we're ignoring out-of-tree users, there's also
 415 #       no need bother prompting for a manual decision:
 416 #       prompt "glob_match() function"
 417         help
 418           This option provides a glob_match function for performing
 419           simple text pattern matching.  It originated in the ATA code
 420           to blacklist particular drive models, but other device drivers
 421           may need similar functionality.
 422
 423           All drivers in the Linux kernel tree that require this function
 424           should automatically select this option.  Say N unless you
 425           are compiling an out-of tree driver which tells you that it
 426           depends on this.
 427
 428 config GLOB_SELFTEST
 429         bool "glob self-test on init"
 430         default n
 431         depends on GLOB
 432         help
 433           This option enables a simple self-test of the glob_match
 434           function on startup.  It is primarily useful for people
 435           working on the code to ensure they haven't introduced any
 436           regressions.
 437
 438           It only adds a little bit of code and slows kernel boot (or
 439           module load) by a small amount, so you're welcome to play with
 440           it, but you probably don't need it.
 441
 442 #
 443 # Netlink attribute parsing support is select'ed if needed
 444 #
 445 config NLATTR
 446         bool
 447
 448 #
 449 # Generic 64-bit atomic support is selected if needed
 450 #
 451 config GENERIC_ATOMIC64
 452        bool
 453
 454 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 455         def_bool y if GENERIC_ATOMIC64
 456
 457 config LRU_CACHE
 458         tristate
 459
 460 config CLZ_TAB
 461         bool
 462
 463 config CORDIC
 464         tristate "CORDIC algorithm"
 465         help
 466           This option provides an implementation of the CORDIC algorithm;
 467           calculations are in fixed point. Module will be called cordic.
 468
 469 config DDR
 470         bool "JEDEC DDR data"
 471         help
 472           Data from JEDEC specs for DDR SDRAM memories,
 473           particularly the AC timing parameters and addressing
 474           information. This data is useful for drivers handling
 475           DDR SDRAM controllers.
 476
 477 config MPILIB
 478         tristate
 479         select CLZ_TAB
 480         help
 481           Multiprecision maths library from GnuPG.
 482           It is used to implement RSA digital signature verification,
 483           which is used by IMA/EVM digital signature extension.
 484
 485 config SIGNATURE
 486         tristate
 487         depends on KEYS
 488         select CRYPTO
 489         select CRYPTO_SHA1
 490         select MPILIB
 491         help
 492           Digital signature verification. Currently only RSA is supported.
 493           Implementation is done using GnuPG MPI library
 494
 495 #
 496 # libfdt files, only selected if needed.
 497 #
 498 config LIBFDT
 499         bool
 500
 501 config OID_REGISTRY
 502         tristate
 503         help
 504           Enable fast lookup object identifier registry.
 505
 506 config UCS2_STRING
 507         tristate
 508
 509 source "lib/fonts/Kconfig"
 510
 511 config SG_SPLIT
 512         def_bool n
 513         help
 514          Provides a heler to split scatterlists into chunks, each chunk being a
 515          scatterlist. This should be selected by a driver or an API which
 516          whishes to split a scatterlist amongst multiple DMA channel.
 517
 518 #
 519 # sg chaining option
 520 #
 521
 522 config ARCH_HAS_SG_CHAIN
 523         def_bool n
 524
 525 config ARCH_HAS_PMEM_API
 526         bool
 527
 528 endmenu