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 LIBIO
  63         bool "Generic logical IO management"
  64         def_bool y if PCI && (ARM || UNICORE32 || MICROBLAZE || ARM64)
  65         help
  66           For some architectures, there are no IO space. To support the
  67           accesses to legacy I/O devices on those architectures, kernel
  68           implemented the memory mapped I/O mechanism based on bridge bus
  69           supports. But for some buses which do not support MMIO, the
  70           peripherals there should be accessed with device-specific way.
  71           To abstract those different I/O accesses into unified I/O accessors,
  72           this option provide a generic I/O space management way after mapping
  73           the device I/O to system logical/fake I/O and help to hide all the
  74           hardware detail.
  75
  76 config CRC_CCITT
  77         tristate "CRC-CCITT functions"
  78         help
  79           This option is provided for the case where no in-kernel-tree
  80           modules require CRC-CCITT functions, but a module built outside
  81           the kernel tree does. Such modules that use library CRC-CCITT
  82           functions require M here.
  83
  84 config CRC16
  85         tristate "CRC16 functions"
  86         help
  87           This option is provided for the case where no in-kernel-tree
  88           modules require CRC16 functions, but a module built outside
  89           the kernel tree does. Such modules that use library CRC16
  90           functions require M here.
  91
  92 config CRC_T10DIF
  93         tristate "CRC calculation for the T10 Data Integrity Field"
  94         select CRYPTO
  95         select CRYPTO_CRCT10DIF
  96         help
  97           This option is only needed if a module that's not in the
  98           kernel tree needs to calculate CRC checks for use with the
  99           SCSI data integrity subsystem.
 100
 101 config CRC_ITU_T
 102         tristate "CRC ITU-T V.41 functions"
 103         help
 104           This option is provided for the case where no in-kernel-tree
 105           modules require CRC ITU-T V.41 functions, but a module built outside
 106           the kernel tree does. Such modules that use library CRC ITU-T V.41
 107           functions require M here.
 108
 109 config CRC32
 110         tristate "CRC32/CRC32c functions"
 111         default y
 112         select BITREVERSE
 113         help
 114           This option is provided for the case where no in-kernel-tree
 115           modules require CRC32/CRC32c functions, but a module built outside
 116           the kernel tree does. Such modules that use library CRC32/CRC32c
 117           functions require M here.
 118
 119 config CRC32_SELFTEST
 120         bool "CRC32 perform self test on init"
 121         default n
 122         depends on CRC32
 123         help
 124           This option enables the CRC32 library functions to perform a
 125           self test on initialization. The self test computes crc32_le
 126           and crc32_be over byte strings with random alignment and length
 127           and computes the total elapsed time and number of bytes processed.
 128
 129 choice
 130         prompt "CRC32 implementation"
 131         depends on CRC32
 132         default CRC32_SLICEBY8
 133         help
 134           This option allows a kernel builder to override the default choice
 135           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
 136           know that you need one of the others.
 137
 138 config CRC32_SLICEBY8
 139         bool "Slice by 8 bytes"
 140         help
 141           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 142           This is the fastest algorithm, but comes with a 8KiB lookup table.
 143           Most modern processors have enough cache to hold this table without
 144           thrashing the cache.
 145
 146           This is the default implementation choice.  Choose this one unless
 147           you have a good reason not to.
 148
 149 config CRC32_SLICEBY4
 150         bool "Slice by 4 bytes"
 151         help
 152           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 153           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 154           table.
 155
 156           Only choose this option if you know what you are doing.
 157
 158 config CRC32_SARWATE
 159         bool "Sarwate's Algorithm (one byte at a time)"
 160         help
 161           Calculate checksum a byte at a time using Sarwate's algorithm.  This
 162           is not particularly fast, but has a small 256 byte lookup table.
 163
 164           Only choose this option if you know what you are doing.
 165
 166 config CRC32_BIT
 167         bool "Classic Algorithm (one bit at a time)"
 168         help
 169           Calculate checksum one bit at a time.  This is VERY slow, but has
 170           no lookup table.  This is provided as a debugging option.
 171
 172           Only choose this option if you are debugging crc32.
 173
 174 endchoice
 175
 176 config CRC7
 177         tristate "CRC7 functions"
 178         help
 179           This option is provided for the case where no in-kernel-tree
 180           modules require CRC7 functions, but a module built outside
 181           the kernel tree does. Such modules that use library CRC7
 182           functions require M here.
 183
 184 config LIBCRC32C
 185         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 186         select CRYPTO
 187         select CRYPTO_CRC32C
 188         help
 189           This option is provided for the case where no in-kernel-tree
 190           modules require CRC32c functions, but a module built outside the
 191           kernel tree does. Such modules that use library CRC32c functions
 192           require M here.  See Castagnoli93.
 193           Module will be libcrc32c.
 194
 195 config CRC8
 196         tristate "CRC8 function"
 197         help
 198           This option provides CRC8 function. Drivers may select this
 199           when they need to do cyclic redundancy check according CRC8
 200           algorithm. Module will be called crc8.
 201
 202 config AUDIT_GENERIC
 203         bool
 204         depends on AUDIT && !AUDIT_ARCH
 205         default y
 206
 207 config AUDIT_ARCH_COMPAT_GENERIC
 208         bool
 209         default n
 210
 211 config AUDIT_COMPAT_GENERIC
 212         bool
 213         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
 214         default y
 215
 216 config RANDOM32_SELFTEST
 217         bool "PRNG perform self test on init"
 218         default n
 219         help
 220           This option enables the 32 bit PRNG library functions to perform a
 221           self test on initialization.
 222
 223 #
 224 # compression support is select'ed if needed
 225 #
 226 config 842_COMPRESS
 227         select CRC32
 228         tristate
 229
 230 config 842_DECOMPRESS
 231         select CRC32
 232         tristate
 233
 234 config ZLIB_INFLATE
 235         tristate
 236
 237 config ZLIB_DEFLATE
 238         tristate
 239         select BITREVERSE
 240
 241 config LZO_COMPRESS
 242         tristate
 243
 244 config LZO_DECOMPRESS
 245         tristate
 246
 247 config LZ4_COMPRESS
 248         tristate
 249
 250 config LZ4HC_COMPRESS
 251         tristate
 252
 253 config LZ4_DECOMPRESS
 254         tristate
 255
 256 source "lib/xz/Kconfig"
 257
 258 #
 259 # These all provide a common interface (hence the apparent duplication with
 260 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 261 #
 262 config DECOMPRESS_GZIP
 263         select ZLIB_INFLATE
 264         tristate
 265
 266 config DECOMPRESS_BZIP2
 267         tristate
 268
 269 config DECOMPRESS_LZMA
 270         tristate
 271
 272 config DECOMPRESS_XZ
 273         select XZ_DEC
 274         tristate
 275
 276 config DECOMPRESS_LZO
 277         select LZO_DECOMPRESS
 278         tristate
 279
 280 config DECOMPRESS_LZ4
 281         select LZ4_DECOMPRESS
 282         tristate
 283
 284 #
 285 # Generic allocator support is selected if needed
 286 #
 287 config GENERIC_ALLOCATOR
 288         bool
 289
 290 #
 291 # reed solomon support is select'ed if needed
 292 #
 293 config REED_SOLOMON
 294         tristate
 295
 296 config REED_SOLOMON_ENC8
 297         bool
 298
 299 config REED_SOLOMON_DEC8
 300         bool
 301
 302 config REED_SOLOMON_ENC16
 303         bool
 304
 305 config REED_SOLOMON_DEC16
 306         bool
 307
 308 #
 309 # BCH support is selected if needed
 310 #
 311 config BCH
 312         tristate
 313
 314 config BCH_CONST_PARAMS
 315         bool
 316         help
 317           Drivers may select this option to force specific constant
 318           values for parameters 'm' (Galois field order) and 't'
 319           (error correction capability). Those specific values must
 320           be set by declaring default values for symbols BCH_CONST_M
 321           and BCH_CONST_T.
 322           Doing so will enable extra compiler optimizations,
 323           improving encoding and decoding performance up to 2x for
 324           usual (m,t) values (typically such that m*t < 200).
 325           When this option is selected, the BCH library supports
 326           only a single (m,t) configuration. This is mainly useful
 327           for NAND flash board drivers requiring known, fixed BCH
 328           parameters.
 329
 330 config BCH_CONST_M
 331         int
 332         range 5 15
 333         help
 334           Constant value for Galois field order 'm'. If 'k' is the
 335           number of data bits to protect, 'm' should be chosen such
 336           that (k + m*t) <= 2**m - 1.
 337           Drivers should declare a default value for this symbol if
 338           they select option BCH_CONST_PARAMS.
 339
 340 config BCH_CONST_T
 341         int
 342         help
 343           Constant value for error correction capability in bits 't'.
 344           Drivers should declare a default value for this symbol if
 345           they select option BCH_CONST_PARAMS.
 346
 347 #
 348 # Textsearch support is select'ed if needed
 349 #
 350 config TEXTSEARCH
 351         bool
 352
 353 config TEXTSEARCH_KMP
 354         tristate
 355
 356 config TEXTSEARCH_BM
 357         tristate
 358
 359 config TEXTSEARCH_FSM
 360         tristate
 361
 362 config BTREE
 363         bool
 364
 365 config INTERVAL_TREE
 366         bool
 367         help
 368           Simple, embeddable, interval-tree. Can find the start of an
 369           overlapping range in log(n) time and then iterate over all
 370           overlapping nodes. The algorithm is implemented as an
 371           augmented rbtree.
 372
 373           See:
 374
 375                 Documentation/rbtree.txt
 376
 377           for more information.
 378
 379 config RADIX_TREE_MULTIORDER
 380         bool
 381
 382 config ASSOCIATIVE_ARRAY
 383         bool
 384         help
 385           Generic associative array.  Can be searched and iterated over whilst
 386           it is being modified.  It is also reasonably quick to search and
 387           modify.  The algorithms are non-recursive, and the trees are highly
 388           capacious.
 389
 390           See:
 391
 392                 Documentation/assoc_array.txt
 393
 394           for more information.
 395
 396 config HAS_IOMEM
 397         bool
 398         depends on !NO_IOMEM
 399         select GENERIC_IO
 400         default y
 401
 402 config HAS_IOPORT_MAP
 403         bool
 404         depends on HAS_IOMEM && !NO_IOPORT_MAP
 405         default y
 406
 407 config HAS_DMA
 408         bool
 409         depends on !NO_DMA
 410         default y
 411
 412 config CHECK_SIGNATURE
 413         bool
 414
 415 config CPUMASK_OFFSTACK
 416         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 417         help
 418           Use dynamic allocation for cpumask_var_t, instead of putting
 419           them on the stack.  This is a bit more expensive, but avoids
 420           stack overflow.
 421
 422 config CPU_RMAP
 423         bool
 424         depends on SMP
 425
 426 config DQL
 427         bool
 428
 429 config GLOB
 430         bool
 431 #       This actually supports modular compilation, but the module overhead
 432 #       is ridiculous for the amount of code involved.  Until an out-of-tree
 433 #       driver asks for it, we'll just link it directly it into the kernel
 434 #       when required.  Since we're ignoring out-of-tree users, there's also
 435 #       no need bother prompting for a manual decision:
 436 #       prompt "glob_match() function"
 437         help
 438           This option provides a glob_match function for performing
 439           simple text pattern matching.  It originated in the ATA code
 440           to blacklist particular drive models, but other device drivers
 441           may need similar functionality.
 442
 443           All drivers in the Linux kernel tree that require this function
 444           should automatically select this option.  Say N unless you
 445           are compiling an out-of tree driver which tells you that it
 446           depends on this.
 447
 448 config GLOB_SELFTEST
 449         bool "glob self-test on init"
 450         default n
 451         depends on GLOB
 452         help
 453           This option enables a simple self-test of the glob_match
 454           function on startup.  It is primarily useful for people
 455           working on the code to ensure they haven't introduced any
 456           regressions.
 457
 458           It only adds a little bit of code and slows kernel boot (or
 459           module load) by a small amount, so you're welcome to play with
 460           it, but you probably don't need it.
 461
 462 #
 463 # Netlink attribute parsing support is select'ed if needed
 464 #
 465 config NLATTR
 466         bool
 467
 468 #
 469 # Generic 64-bit atomic support is selected if needed
 470 #
 471 config GENERIC_ATOMIC64
 472        bool
 473
 474 config LRU_CACHE
 475         tristate
 476
 477 config CLZ_TAB
 478         bool
 479
 480 config CORDIC
 481         tristate "CORDIC algorithm"
 482         help
 483           This option provides an implementation of the CORDIC algorithm;
 484           calculations are in fixed point. Module will be called cordic.
 485
 486 config DDR
 487         bool "JEDEC DDR data"
 488         help
 489           Data from JEDEC specs for DDR SDRAM memories,
 490           particularly the AC timing parameters and addressing
 491           information. This data is useful for drivers handling
 492           DDR SDRAM controllers.
 493
 494 config IRQ_POLL
 495         bool "IRQ polling library"
 496         help
 497           Helper library to poll interrupt mitigation using polling.
 498
 499 config MPILIB
 500         tristate
 501         select CLZ_TAB
 502         help
 503           Multiprecision maths library from GnuPG.
 504           It is used to implement RSA digital signature verification,
 505           which is used by IMA/EVM digital signature extension.
 506
 507 config SIGNATURE
 508         tristate
 509         depends on KEYS
 510         select CRYPTO
 511         select CRYPTO_SHA1
 512         select MPILIB
 513         help
 514           Digital signature verification. Currently only RSA is supported.
 515           Implementation is done using GnuPG MPI library
 516
 517 #
 518 # libfdt files, only selected if needed.
 519 #
 520 config LIBFDT
 521         bool
 522
 523 config OID_REGISTRY
 524         tristate
 525         help
 526           Enable fast lookup object identifier registry.
 527
 528 config UCS2_STRING
 529         tristate
 530
 531 source "lib/fonts/Kconfig"
 532
 533 config SG_SPLIT
 534         def_bool n
 535         help
 536          Provides a helper to split scatterlists into chunks, each chunk being
 537          a scatterlist. This should be selected by a driver or an API which
 538          whishes to split a scatterlist amongst multiple DMA channels.
 539
 540 config SG_POOL
 541         def_bool n
 542         help
 543          Provides a helper to allocate chained scatterlists. This should be
 544          selected by a driver or an API which whishes to allocate chained
 545          scatterlist.
 546
 547 #
 548 # sg chaining option
 549 #
 550
 551 config ARCH_HAS_SG_CHAIN
 552         def_bool n
 553
 554 config ARCH_HAS_PMEM_API
 555         bool
 556
 557 config ARCH_HAS_MMIO_FLUSH
 558         bool
 559
 560 config STACKDEPOT
 561         bool
 562         select STACKTRACE
 563
 564 config SBITMAP
 565         bool
 566
 567 endmenu