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 842_COMPRESS 216 tristate 217 218config 842_DECOMPRESS 219 tristate 220 221config ZLIB_INFLATE 222 tristate 223 224config ZLIB_DEFLATE 225 tristate 226 227config LZO_COMPRESS 228 tristate 229 230config LZO_DECOMPRESS 231 tristate 232 233config LZ4_COMPRESS 234 tristate 235 236config LZ4HC_COMPRESS 237 tristate 238 239config LZ4_DECOMPRESS 240 tristate 241 242source "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# 248config DECOMPRESS_GZIP 249 select ZLIB_INFLATE 250 tristate 251 252config DECOMPRESS_BZIP2 253 tristate 254 255config DECOMPRESS_LZMA 256 tristate 257 258config DECOMPRESS_XZ 259 select XZ_DEC 260 tristate 261 262config DECOMPRESS_LZO 263 select LZO_DECOMPRESS 264 tristate 265 266config DECOMPRESS_LZ4 267 select LZ4_DECOMPRESS 268 tristate 269 270# 271# Generic allocator support is selected if needed 272# 273config GENERIC_ALLOCATOR 274 bool 275 276# 277# reed solomon support is select'ed if needed 278# 279config REED_SOLOMON 280 tristate 281 282config REED_SOLOMON_ENC8 283 bool 284 285config REED_SOLOMON_DEC8 286 bool 287 288config REED_SOLOMON_ENC16 289 bool 290 291config REED_SOLOMON_DEC16 292 bool 293 294# 295# BCH support is selected if needed 296# 297config BCH 298 tristate 299 300config 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 316config 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 326config 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# 336config TEXTSEARCH 337 bool 338 339config TEXTSEARCH_KMP 340 tristate 341 342config TEXTSEARCH_BM 343 tristate 344 345config TEXTSEARCH_FSM 346 tristate 347 348config BTREE 349 bool 350 351config 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 365config 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 379config HAS_IOMEM 380 bool 381 depends on !NO_IOMEM 382 select GENERIC_IO 383 default y 384 385config HAS_IOPORT_MAP 386 bool 387 depends on HAS_IOMEM && !NO_IOPORT_MAP 388 default y 389 390config HAS_DMA 391 bool 392 depends on !NO_DMA 393 default y 394 395config CHECK_SIGNATURE 396 bool 397 398config 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 405config CPU_RMAP 406 bool 407 depends on SMP 408 409config DQL 410 bool 411 412config 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 431config 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# 448config NLATTR 449 bool 450 451# 452# Generic 64-bit atomic support is selected if needed 453# 454config GENERIC_ATOMIC64 455 bool 456 457config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 458 def_bool y if GENERIC_ATOMIC64 459 460config LRU_CACHE 461 tristate 462 463config AVERAGE 464 bool "Averaging functions" 465 help 466 This option is provided for the case where no in-kernel-tree 467 modules require averaging functions, but a module built outside 468 the kernel tree does. Such modules that use library averaging 469 functions require Y here. 470 471 If unsure, say N. 472 473config CLZ_TAB 474 bool 475 476config CORDIC 477 tristate "CORDIC algorithm" 478 help 479 This option provides an implementation of the CORDIC algorithm; 480 calculations are in fixed point. Module will be called cordic. 481 482config DDR 483 bool "JEDEC DDR data" 484 help 485 Data from JEDEC specs for DDR SDRAM memories, 486 particularly the AC timing parameters and addressing 487 information. This data is useful for drivers handling 488 DDR SDRAM controllers. 489 490config MPILIB 491 tristate 492 select CLZ_TAB 493 help 494 Multiprecision maths library from GnuPG. 495 It is used to implement RSA digital signature verification, 496 which is used by IMA/EVM digital signature extension. 497 498config SIGNATURE 499 tristate 500 depends on KEYS 501 select CRYPTO 502 select CRYPTO_SHA1 503 select MPILIB 504 help 505 Digital signature verification. Currently only RSA is supported. 506 Implementation is done using GnuPG MPI library 507 508# 509# libfdt files, only selected if needed. 510# 511config LIBFDT 512 bool 513 514config OID_REGISTRY 515 tristate 516 help 517 Enable fast lookup object identifier registry. 518 519config UCS2_STRING 520 tristate 521 522source "lib/fonts/Kconfig" 523 524# 525# sg chaining option 526# 527 528config ARCH_HAS_SG_CHAIN 529 def_bool n 530 531config ARCH_HAS_PMEM_API 532 bool 533 534endmenu 535