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         select CRC32
 214         tristate
 215
 216 config 842_DECOMPRESS
 217         select CRC32
 218         tristate
 219
 220 config ZLIB_INFLATE
 221         tristate
 222
 223 config ZLIB_DEFLATE
 224         tristate
 225         select BITREVERSE
 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 CLZ_TAB
 464         bool
 465
 466 config CORDIC
 467         tristate "CORDIC algorithm"
 468         help
 469           This option provides an implementation of the CORDIC algorithm;
 470           calculations are in fixed point. Module will be called cordic.
 471
 472 config DDR
 473         bool "JEDEC DDR data"
 474         help
 475           Data from JEDEC specs for DDR SDRAM memories,
 476           particularly the AC timing parameters and addressing
 477           information. This data is useful for drivers handling
 478           DDR SDRAM controllers.
 479
 480 config IRQ_POLL
 481         bool "IRQ polling library"
 482         help
 483           Helper library to poll interrupt mitigation using polling.
 484
 485 config MPILIB
 486         tristate
 487         select CLZ_TAB
 488         help
 489           Multiprecision maths library from GnuPG.
 490           It is used to implement RSA digital signature verification,
 491           which is used by IMA/EVM digital signature extension.
 492
 493 config SIGNATURE
 494         tristate
 495         depends on KEYS
 496         select CRYPTO
 497         select CRYPTO_SHA1
 498         select MPILIB
 499         help
 500           Digital signature verification. Currently only RSA is supported.
 501           Implementation is done using GnuPG MPI library
 502
 503 #
 504 # libfdt files, only selected if needed.
 505 #
 506 config LIBFDT
 507         bool
 508
 509 config OID_REGISTRY
 510         tristate
 511         help
 512           Enable fast lookup object identifier registry.
 513
 514 config UCS2_STRING
 515         tristate
 516
 517 source "lib/fonts/Kconfig"
 518
 519 config SG_SPLIT
 520         def_bool n
 521         help
 522          Provides a helper to split scatterlists into chunks, each chunk being
 523          a scatterlist. This should be selected by a driver or an API which
 524          whishes to split a scatterlist amongst multiple DMA channels.
 525
 526 #
 527 # sg chaining option
 528 #
 529
 530 config ARCH_HAS_SG_CHAIN
 531         def_bool n
 532
 533 config ARCH_HAS_PMEM_API
 534         bool
 535
 536 config ARCH_HAS_MMIO_FLUSH
 537         bool
 538
 539 config STACKDEPOT
 540         bool
 541         select STACKTRACE
 542
 543 endmenu