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         tristate "CRC32 perform self test on init"
 121         depends on CRC32
 122         help
 123           This option enables the CRC32 library functions to perform a
 124           self test on initialization. The self test computes crc32_le
 125           and crc32_be over byte strings with random alignment and length
 126           and computes the total elapsed time and number of bytes processed.
 127
 128 choice
 129         prompt "CRC32 implementation"
 130         depends on CRC32
 131         default CRC32_SLICEBY8
 132         help
 133           This option allows a kernel builder to override the default choice
 134           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
 135           know that you need one of the others.
 136
 137 config CRC32_SLICEBY8
 138         bool "Slice by 8 bytes"
 139         help
 140           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 141           This is the fastest algorithm, but comes with a 8KiB lookup table.
 142           Most modern processors have enough cache to hold this table without
 143           thrashing the cache.
 144
 145           This is the default implementation choice.  Choose this one unless
 146           you have a good reason not to.
 147
 148 config CRC32_SLICEBY4
 149         bool "Slice by 4 bytes"
 150         help
 151           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 152           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 153           table.
 154
 155           Only choose this option if you know what you are doing.
 156
 157 config CRC32_SARWATE
 158         bool "Sarwate's Algorithm (one byte at a time)"
 159         help
 160           Calculate checksum a byte at a time using Sarwate's algorithm.  This
 161           is not particularly fast, but has a small 256 byte lookup table.
 162
 163           Only choose this option if you know what you are doing.
 164
 165 config CRC32_BIT
 166         bool "Classic Algorithm (one bit at a time)"
 167         help
 168           Calculate checksum one bit at a time.  This is VERY slow, but has
 169           no lookup table.  This is provided as a debugging option.
 170
 171           Only choose this option if you are debugging crc32.
 172
 173 endchoice
 174
 175 config CRC4
 176         tristate "CRC4 functions"
 177         help
 178           This option is provided for the case where no in-kernel-tree
 179           modules require CRC4 functions, but a module built outside
 180           the kernel tree does. Such modules that use library CRC4
 181           functions require M here.
 182
 183 config CRC7
 184         tristate "CRC7 functions"
 185         help
 186           This option is provided for the case where no in-kernel-tree
 187           modules require CRC7 functions, but a module built outside
 188           the kernel tree does. Such modules that use library CRC7
 189           functions require M here.
 190
 191 config LIBCRC32C
 192         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
 193         select CRYPTO
 194         select CRYPTO_CRC32C
 195         help
 196           This option is provided for the case where no in-kernel-tree
 197           modules require CRC32c functions, but a module built outside the
 198           kernel tree does. Such modules that use library CRC32c functions
 199           require M here.  See Castagnoli93.
 200           Module will be libcrc32c.
 201
 202 config CRC8
 203         tristate "CRC8 function"
 204         help
 205           This option provides CRC8 function. Drivers may select this
 206           when they need to do cyclic redundancy check according CRC8
 207           algorithm. Module will be called crc8.
 208
 209 config AUDIT_GENERIC
 210         bool
 211         depends on AUDIT && !AUDIT_ARCH
 212         default y
 213
 214 config AUDIT_ARCH_COMPAT_GENERIC
 215         bool
 216         default n
 217
 218 config AUDIT_COMPAT_GENERIC
 219         bool
 220         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
 221         default y
 222
 223 config RANDOM32_SELFTEST
 224         bool "PRNG perform self test on init"
 225         default n
 226         help
 227           This option enables the 32 bit PRNG library functions to perform a
 228           self test on initialization.
 229
 230 #
 231 # compression support is select'ed if needed
 232 #
 233 config 842_COMPRESS
 234         select CRC32
 235         tristate
 236
 237 config 842_DECOMPRESS
 238         select CRC32
 239         tristate
 240
 241 config ZLIB_INFLATE
 242         tristate
 243
 244 config ZLIB_DEFLATE
 245         tristate
 246         select BITREVERSE
 247
 248 config LZO_COMPRESS
 249         tristate
 250
 251 config LZO_DECOMPRESS
 252         tristate
 253
 254 config LZ4_COMPRESS
 255         tristate
 256
 257 config LZ4HC_COMPRESS
 258         tristate
 259
 260 config LZ4_DECOMPRESS
 261         tristate
 262
 263 source "lib/xz/Kconfig"
 264
 265 #
 266 # These all provide a common interface (hence the apparent duplication with
 267 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
 268 #
 269 config DECOMPRESS_GZIP
 270         select ZLIB_INFLATE
 271         tristate
 272
 273 config DECOMPRESS_BZIP2
 274         tristate
 275
 276 config DECOMPRESS_LZMA
 277         tristate
 278
 279 config DECOMPRESS_XZ
 280         select XZ_DEC
 281         tristate
 282
 283 config DECOMPRESS_LZO
 284         select LZO_DECOMPRESS
 285         tristate
 286
 287 config DECOMPRESS_LZ4
 288         select LZ4_DECOMPRESS
 289         tristate
 290
 291 #
 292 # Generic allocator support is selected if needed
 293 #
 294 config GENERIC_ALLOCATOR
 295         bool
 296
 297 #
 298 # reed solomon support is select'ed if needed
 299 #
 300 config REED_SOLOMON
 301         tristate
 302
 303 config REED_SOLOMON_ENC8
 304         bool
 305
 306 config REED_SOLOMON_DEC8
 307         bool
 308
 309 config REED_SOLOMON_ENC16
 310         bool
 311
 312 config REED_SOLOMON_DEC16
 313         bool
 314
 315 #
 316 # BCH support is selected if needed
 317 #
 318 config BCH
 319         tristate
 320
 321 config BCH_CONST_PARAMS
 322         bool
 323         help
 324           Drivers may select this option to force specific constant
 325           values for parameters 'm' (Galois field order) and 't'
 326           (error correction capability). Those specific values must
 327           be set by declaring default values for symbols BCH_CONST_M
 328           and BCH_CONST_T.
 329           Doing so will enable extra compiler optimizations,
 330           improving encoding and decoding performance up to 2x for
 331           usual (m,t) values (typically such that m*t < 200).
 332           When this option is selected, the BCH library supports
 333           only a single (m,t) configuration. This is mainly useful
 334           for NAND flash board drivers requiring known, fixed BCH
 335           parameters.
 336
 337 config BCH_CONST_M
 338         int
 339         range 5 15
 340         help
 341           Constant value for Galois field order 'm'. If 'k' is the
 342           number of data bits to protect, 'm' should be chosen such
 343           that (k + m*t) <= 2**m - 1.
 344           Drivers should declare a default value for this symbol if
 345           they select option BCH_CONST_PARAMS.
 346
 347 config BCH_CONST_T
 348         int
 349         help
 350           Constant value for error correction capability in bits 't'.
 351           Drivers should declare a default value for this symbol if
 352           they select option BCH_CONST_PARAMS.
 353
 354 #
 355 # Textsearch support is select'ed if needed
 356 #
 357 config TEXTSEARCH
 358         bool
 359
 360 config TEXTSEARCH_KMP
 361         tristate
 362
 363 config TEXTSEARCH_BM
 364         tristate
 365
 366 config TEXTSEARCH_FSM
 367         tristate
 368
 369 config BTREE
 370         bool
 371
 372 config INTERVAL_TREE
 373         bool
 374         help
 375           Simple, embeddable, interval-tree. Can find the start of an
 376           overlapping range in log(n) time and then iterate over all
 377           overlapping nodes. The algorithm is implemented as an
 378           augmented rbtree.
 379
 380           See:
 381
 382                 Documentation/rbtree.txt
 383
 384           for more information.
 385
 386 config RADIX_TREE_MULTIORDER
 387         bool
 388
 389 config ASSOCIATIVE_ARRAY
 390         bool
 391         help
 392           Generic associative array.  Can be searched and iterated over whilst
 393           it is being modified.  It is also reasonably quick to search and
 394           modify.  The algorithms are non-recursive, and the trees are highly
 395           capacious.
 396
 397           See:
 398
 399                 Documentation/assoc_array.txt
 400
 401           for more information.
 402
 403 config HAS_IOMEM
 404         bool
 405         depends on !NO_IOMEM
 406         select GENERIC_IO
 407         default y
 408
 409 config HAS_IOPORT_MAP
 410         bool
 411         depends on HAS_IOMEM && !NO_IOPORT_MAP
 412         default y
 413
 414 config HAS_DMA
 415         bool
 416         depends on !NO_DMA
 417         default y
 418
 419 config DMA_NOOP_OPS
 420         bool
 421         depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
 422         default n
 423
 424 config DMA_VIRT_OPS
 425         bool
 426         depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
 427         default n
 428
 429 config CHECK_SIGNATURE
 430         bool
 431
 432 config CPUMASK_OFFSTACK
 433         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
 434         help
 435           Use dynamic allocation for cpumask_var_t, instead of putting
 436           them on the stack.  This is a bit more expensive, but avoids
 437           stack overflow.
 438
 439 config CPU_RMAP
 440         bool
 441         depends on SMP
 442
 443 config DQL
 444         bool
 445
 446 config GLOB
 447         bool
 448 #       This actually supports modular compilation, but the module overhead
 449 #       is ridiculous for the amount of code involved.  Until an out-of-tree
 450 #       driver asks for it, we'll just link it directly it into the kernel
 451 #       when required.  Since we're ignoring out-of-tree users, there's also
 452 #       no need bother prompting for a manual decision:
 453 #       prompt "glob_match() function"
 454         help
 455           This option provides a glob_match function for performing
 456           simple text pattern matching.  It originated in the ATA code
 457           to blacklist particular drive models, but other device drivers
 458           may need similar functionality.
 459
 460           All drivers in the Linux kernel tree that require this function
 461           should automatically select this option.  Say N unless you
 462           are compiling an out-of tree driver which tells you that it
 463           depends on this.
 464
 465 config GLOB_SELFTEST
 466         tristate "glob self-test on init"
 467         depends on GLOB
 468         help
 469           This option enables a simple self-test of the glob_match
 470           function on startup.  It is primarily useful for people
 471           working on the code to ensure they haven't introduced any
 472           regressions.
 473
 474           It only adds a little bit of code and slows kernel boot (or
 475           module load) by a small amount, so you're welcome to play with
 476           it, but you probably don't need it.
 477
 478 #
 479 # Netlink attribute parsing support is select'ed if needed
 480 #
 481 config NLATTR
 482         bool
 483
 484 #
 485 # Generic 64-bit atomic support is selected if needed
 486 #
 487 config GENERIC_ATOMIC64
 488        bool
 489
 490 config LRU_CACHE
 491         tristate
 492
 493 config CLZ_TAB
 494         bool
 495
 496 config CORDIC
 497         tristate "CORDIC algorithm"
 498         help
 499           This option provides an implementation of the CORDIC algorithm;
 500           calculations are in fixed point. Module will be called cordic.
 501
 502 config DDR
 503         bool "JEDEC DDR data"
 504         help
 505           Data from JEDEC specs for DDR SDRAM memories,
 506           particularly the AC timing parameters and addressing
 507           information. This data is useful for drivers handling
 508           DDR SDRAM controllers.
 509
 510 config IRQ_POLL
 511         bool "IRQ polling library"
 512         help
 513           Helper library to poll interrupt mitigation using polling.
 514
 515 config MPILIB
 516         tristate
 517         select CLZ_TAB
 518         help
 519           Multiprecision maths library from GnuPG.
 520           It is used to implement RSA digital signature verification,
 521           which is used by IMA/EVM digital signature extension.
 522
 523 config SIGNATURE
 524         tristate
 525         depends on KEYS
 526         select CRYPTO
 527         select CRYPTO_SHA1
 528         select MPILIB
 529         help
 530           Digital signature verification. Currently only RSA is supported.
 531           Implementation is done using GnuPG MPI library
 532
 533 #
 534 # libfdt files, only selected if needed.
 535 #
 536 config LIBFDT
 537         bool
 538
 539 config OID_REGISTRY
 540         tristate
 541         help
 542           Enable fast lookup object identifier registry.
 543
 544 config UCS2_STRING
 545         tristate
 546
 547 source "lib/fonts/Kconfig"
 548
 549 config SG_SPLIT
 550         def_bool n
 551         help
 552          Provides a helper to split scatterlists into chunks, each chunk being
 553          a scatterlist. This should be selected by a driver or an API which
 554          whishes to split a scatterlist amongst multiple DMA channels.
 555
 556 config SG_POOL
 557         def_bool n
 558         help
 559          Provides a helper to allocate chained scatterlists. This should be
 560          selected by a driver or an API which whishes to allocate chained
 561          scatterlist.
 562
 563 #
 564 # sg chaining option
 565 #
 566
 567 config ARCH_HAS_SG_CHAIN
 568         def_bool n
 569
 570 config ARCH_HAS_PMEM_API
 571         bool
 572
 573 config ARCH_HAS_UACCESS_FLUSHCACHE
 574         bool
 575
 576 config ARCH_HAS_MMIO_FLUSH
 577         bool
 578
 579 config STACKDEPOT
 580         bool
 581         select STACKTRACE
 582
 583 config SBITMAP
 584         bool
 585
 586 config PARMAN
 587         tristate "parman" if COMPILE_TEST
 588
 589 config PRIME_NUMBERS
 590         tristate
 591
 592 endmenu