1# 2# Library configuration 3# 4 5config BINARY_PRINTF 6 def_bool n 7 8menu "Library routines" 9 10config RAID6_PQ 11 tristate 12 13config BITREVERSE 14 tristate 15 16config 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 24config RATIONAL 25 bool 26 27config GENERIC_STRNCPY_FROM_USER 28 bool 29 30config GENERIC_STRNLEN_USER 31 bool 32 33config GENERIC_NET_UTILS 34 bool 35 36config GENERIC_FIND_FIRST_BIT 37 bool 38 39config NO_GENERIC_PCI_IOPORT_MAP 40 bool 41 42config GENERIC_PCI_IOMAP 43 bool 44 45config GENERIC_IOMAP 46 bool 47 select GENERIC_PCI_IOMAP 48 49config GENERIC_IO 50 bool 51 default n 52 53config STMP_DEVICE 54 bool 55 56config PERCPU_RWSEM 57 bool 58 59config ARCH_USE_CMPXCHG_LOCKREF 60 bool 61 62config ARCH_HAS_FAST_MULTIPLIER 63 bool 64 65config 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 73config 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 81config 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 90config 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 98config 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 108config 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 118choice 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 127config 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 138config 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 147config 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 155config 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 163endchoice 164 165config 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 173config 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 184config 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 191config AUDIT_GENERIC 192 bool 193 depends on AUDIT && !AUDIT_ARCH 194 default y 195 196config AUDIT_ARCH_COMPAT_GENERIC 197 bool 198 default n 199 200config AUDIT_COMPAT_GENERIC 201 bool 202 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 203 default y 204 205config 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# 215config ZLIB_INFLATE 216 tristate 217 218config ZLIB_DEFLATE 219 tristate 220 221config LZO_COMPRESS 222 tristate 223 224config LZO_DECOMPRESS 225 tristate 226 227config LZ4_COMPRESS 228 tristate 229 230config LZ4HC_COMPRESS 231 tristate 232 233config LZ4_DECOMPRESS 234 tristate 235 236source "lib/xz/Kconfig" 237 238# 239# These all provide a common interface (hence the apparent duplication with 240# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 241# 242config DECOMPRESS_GZIP 243 select ZLIB_INFLATE 244 tristate 245 246config DECOMPRESS_BZIP2 247 tristate 248 249config DECOMPRESS_LZMA 250 tristate 251 252config DECOMPRESS_XZ 253 select XZ_DEC 254 tristate 255 256config DECOMPRESS_LZO 257 select LZO_DECOMPRESS 258 tristate 259 260config DECOMPRESS_LZ4 261 select LZ4_DECOMPRESS 262 tristate 263 264# 265# Generic allocator support is selected if needed 266# 267config GENERIC_ALLOCATOR 268 bool 269 270# 271# reed solomon support is select'ed if needed 272# 273config REED_SOLOMON 274 tristate 275 276config REED_SOLOMON_ENC8 277 bool 278 279config REED_SOLOMON_DEC8 280 bool 281 282config REED_SOLOMON_ENC16 283 bool 284 285config REED_SOLOMON_DEC16 286 bool 287 288# 289# BCH support is selected if needed 290# 291config BCH 292 tristate 293 294config BCH_CONST_PARAMS 295 bool 296 help 297 Drivers may select this option to force specific constant 298 values for parameters 'm' (Galois field order) and 't' 299 (error correction capability). Those specific values must 300 be set by declaring default values for symbols BCH_CONST_M 301 and BCH_CONST_T. 302 Doing so will enable extra compiler optimizations, 303 improving encoding and decoding performance up to 2x for 304 usual (m,t) values (typically such that m*t < 200). 305 When this option is selected, the BCH library supports 306 only a single (m,t) configuration. This is mainly useful 307 for NAND flash board drivers requiring known, fixed BCH 308 parameters. 309 310config BCH_CONST_M 311 int 312 range 5 15 313 help 314 Constant value for Galois field order 'm'. If 'k' is the 315 number of data bits to protect, 'm' should be chosen such 316 that (k + m*t) <= 2**m - 1. 317 Drivers should declare a default value for this symbol if 318 they select option BCH_CONST_PARAMS. 319 320config BCH_CONST_T 321 int 322 help 323 Constant value for error correction capability in bits 't'. 324 Drivers should declare a default value for this symbol if 325 they select option BCH_CONST_PARAMS. 326 327# 328# Textsearch support is select'ed if needed 329# 330config TEXTSEARCH 331 bool 332 333config TEXTSEARCH_KMP 334 tristate 335 336config TEXTSEARCH_BM 337 tristate 338 339config TEXTSEARCH_FSM 340 tristate 341 342config BTREE 343 bool 344 345config INTERVAL_TREE 346 bool 347 help 348 Simple, embeddable, interval-tree. Can find the start of an 349 overlapping range in log(n) time and then iterate over all 350 overlapping nodes. The algorithm is implemented as an 351 augmented rbtree. 352 353 See: 354 355 Documentation/rbtree.txt 356 357 for more information. 358 359config ASSOCIATIVE_ARRAY 360 bool 361 help 362 Generic associative array. Can be searched and iterated over whilst 363 it is being modified. It is also reasonably quick to search and 364 modify. The algorithms are non-recursive, and the trees are highly 365 capacious. 366 367 See: 368 369 Documentation/assoc_array.txt 370 371 for more information. 372 373config HAS_IOMEM 374 bool 375 depends on !NO_IOMEM 376 select GENERIC_IO 377 default y 378 379config HAS_IOPORT_MAP 380 bool 381 depends on HAS_IOMEM && !NO_IOPORT_MAP 382 default y 383 384config HAS_DMA 385 bool 386 depends on !NO_DMA 387 default y 388 389config CHECK_SIGNATURE 390 bool 391 392config CPUMASK_OFFSTACK 393 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 394 help 395 Use dynamic allocation for cpumask_var_t, instead of putting 396 them on the stack. This is a bit more expensive, but avoids 397 stack overflow. 398 399config CPU_RMAP 400 bool 401 depends on SMP 402 403config DQL 404 bool 405 406config GLOB 407 bool 408# This actually supports modular compilation, but the module overhead 409# is ridiculous for the amount of code involved. Until an out-of-tree 410# driver asks for it, we'll just link it directly it into the kernel 411# when required. Since we're ignoring out-of-tree users, there's also 412# no need bother prompting for a manual decision: 413# prompt "glob_match() function" 414 help 415 This option provides a glob_match function for performing 416 simple text pattern matching. It originated in the ATA code 417 to blacklist particular drive models, but other device drivers 418 may need similar functionality. 419 420 All drivers in the Linux kernel tree that require this function 421 should automatically select this option. Say N unless you 422 are compiling an out-of tree driver which tells you that it 423 depends on this. 424 425config GLOB_SELFTEST 426 bool "glob self-test on init" 427 default n 428 depends on GLOB 429 help 430 This option enables a simple self-test of the glob_match 431 function on startup. It is primarily useful for people 432 working on the code to ensure they haven't introduced any 433 regressions. 434 435 It only adds a little bit of code and slows kernel boot (or 436 module load) by a small amount, so you're welcome to play with 437 it, but you probably don't need it. 438 439# 440# Netlink attribute parsing support is select'ed if needed 441# 442config NLATTR 443 bool 444 445# 446# Generic 64-bit atomic support is selected if needed 447# 448config GENERIC_ATOMIC64 449 bool 450 451config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 452 def_bool y if GENERIC_ATOMIC64 453 454config LRU_CACHE 455 tristate 456 457config AVERAGE 458 bool "Averaging functions" 459 help 460 This option is provided for the case where no in-kernel-tree 461 modules require averaging functions, but a module built outside 462 the kernel tree does. Such modules that use library averaging 463 functions require Y here. 464 465 If unsure, say N. 466 467config CLZ_TAB 468 bool 469 470config CORDIC 471 tristate "CORDIC algorithm" 472 help 473 This option provides an implementation of the CORDIC algorithm; 474 calculations are in fixed point. Module will be called cordic. 475 476config DDR 477 bool "JEDEC DDR data" 478 help 479 Data from JEDEC specs for DDR SDRAM memories, 480 particularly the AC timing parameters and addressing 481 information. This data is useful for drivers handling 482 DDR SDRAM controllers. 483 484config MPILIB 485 tristate 486 select CLZ_TAB 487 help 488 Multiprecision maths library from GnuPG. 489 It is used to implement RSA digital signature verification, 490 which is used by IMA/EVM digital signature extension. 491 492config SIGNATURE 493 tristate 494 depends on KEYS 495 select CRYPTO 496 select CRYPTO_SHA1 497 select MPILIB 498 help 499 Digital signature verification. Currently only RSA is supported. 500 Implementation is done using GnuPG MPI library 501 502# 503# libfdt files, only selected if needed. 504# 505config LIBFDT 506 bool 507 508config OID_REGISTRY 509 tristate 510 help 511 Enable fast lookup object identifier registry. 512 513config UCS2_STRING 514 tristate 515 516source "lib/fonts/Kconfig" 517 518# 519# sg chaining option 520# 521 522config ARCH_HAS_SG_CHAIN 523 def_bool n 524 525endmenu 526