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 ARCH_USE_CMPXCHG_LOCKREF 57 bool 58 59config ARCH_HAS_FAST_MULTIPLIER 60 bool 61 62config 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 70config 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 78config 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 87config 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 95config 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 105config 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 115choice 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 124config 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 135config 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 144config 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 152config 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 160endchoice 161 162config 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 170config 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 181config 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 188config AUDIT_GENERIC 189 bool 190 depends on AUDIT && !AUDIT_ARCH 191 default y 192 193config AUDIT_ARCH_COMPAT_GENERIC 194 bool 195 default n 196 197config AUDIT_COMPAT_GENERIC 198 bool 199 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 200 default y 201 202config 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# 212config 842_COMPRESS 213 tristate 214 215config 842_DECOMPRESS 216 tristate 217 218config ZLIB_INFLATE 219 tristate 220 221config ZLIB_DEFLATE 222 tristate 223 224config LZO_COMPRESS 225 tristate 226 227config LZO_DECOMPRESS 228 tristate 229 230config LZ4_COMPRESS 231 tristate 232 233config LZ4HC_COMPRESS 234 tristate 235 236config LZ4_DECOMPRESS 237 tristate 238 239source "lib/xz/Kconfig" 240 241# 242# These all provide a common interface (hence the apparent duplication with 243# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 244# 245config DECOMPRESS_GZIP 246 select ZLIB_INFLATE 247 tristate 248 249config DECOMPRESS_BZIP2 250 tristate 251 252config DECOMPRESS_LZMA 253 tristate 254 255config DECOMPRESS_XZ 256 select XZ_DEC 257 tristate 258 259config DECOMPRESS_LZO 260 select LZO_DECOMPRESS 261 tristate 262 263config DECOMPRESS_LZ4 264 select LZ4_DECOMPRESS 265 tristate 266 267# 268# Generic allocator support is selected if needed 269# 270config GENERIC_ALLOCATOR 271 bool 272 273# 274# reed solomon support is select'ed if needed 275# 276config REED_SOLOMON 277 tristate 278 279config REED_SOLOMON_ENC8 280 bool 281 282config REED_SOLOMON_DEC8 283 bool 284 285config REED_SOLOMON_ENC16 286 bool 287 288config REED_SOLOMON_DEC16 289 bool 290 291# 292# BCH support is selected if needed 293# 294config BCH 295 tristate 296 297config BCH_CONST_PARAMS 298 bool 299 help 300 Drivers may select this option to force specific constant 301 values for parameters 'm' (Galois field order) and 't' 302 (error correction capability). Those specific values must 303 be set by declaring default values for symbols BCH_CONST_M 304 and BCH_CONST_T. 305 Doing so will enable extra compiler optimizations, 306 improving encoding and decoding performance up to 2x for 307 usual (m,t) values (typically such that m*t < 200). 308 When this option is selected, the BCH library supports 309 only a single (m,t) configuration. This is mainly useful 310 for NAND flash board drivers requiring known, fixed BCH 311 parameters. 312 313config BCH_CONST_M 314 int 315 range 5 15 316 help 317 Constant value for Galois field order 'm'. If 'k' is the 318 number of data bits to protect, 'm' should be chosen such 319 that (k + m*t) <= 2**m - 1. 320 Drivers should declare a default value for this symbol if 321 they select option BCH_CONST_PARAMS. 322 323config BCH_CONST_T 324 int 325 help 326 Constant value for error correction capability in bits 't'. 327 Drivers should declare a default value for this symbol if 328 they select option BCH_CONST_PARAMS. 329 330# 331# Textsearch support is select'ed if needed 332# 333config TEXTSEARCH 334 bool 335 336config TEXTSEARCH_KMP 337 tristate 338 339config TEXTSEARCH_BM 340 tristate 341 342config TEXTSEARCH_FSM 343 tristate 344 345config BTREE 346 bool 347 348config INTERVAL_TREE 349 bool 350 help 351 Simple, embeddable, interval-tree. Can find the start of an 352 overlapping range in log(n) time and then iterate over all 353 overlapping nodes. The algorithm is implemented as an 354 augmented rbtree. 355 356 See: 357 358 Documentation/rbtree.txt 359 360 for more information. 361 362config ASSOCIATIVE_ARRAY 363 bool 364 help 365 Generic associative array. Can be searched and iterated over whilst 366 it is being modified. It is also reasonably quick to search and 367 modify. The algorithms are non-recursive, and the trees are highly 368 capacious. 369 370 See: 371 372 Documentation/assoc_array.txt 373 374 for more information. 375 376config HAS_IOMEM 377 bool 378 depends on !NO_IOMEM 379 select GENERIC_IO 380 default y 381 382config HAS_IOPORT_MAP 383 bool 384 depends on HAS_IOMEM && !NO_IOPORT_MAP 385 default y 386 387config HAS_DMA 388 bool 389 depends on !NO_DMA 390 default y 391 392config CHECK_SIGNATURE 393 bool 394 395config CPUMASK_OFFSTACK 396 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 397 help 398 Use dynamic allocation for cpumask_var_t, instead of putting 399 them on the stack. This is a bit more expensive, but avoids 400 stack overflow. 401 402config CPU_RMAP 403 bool 404 depends on SMP 405 406config DQL 407 bool 408 409config GLOB 410 bool 411# This actually supports modular compilation, but the module overhead 412# is ridiculous for the amount of code involved. Until an out-of-tree 413# driver asks for it, we'll just link it directly it into the kernel 414# when required. Since we're ignoring out-of-tree users, there's also 415# no need bother prompting for a manual decision: 416# prompt "glob_match() function" 417 help 418 This option provides a glob_match function for performing 419 simple text pattern matching. It originated in the ATA code 420 to blacklist particular drive models, but other device drivers 421 may need similar functionality. 422 423 All drivers in the Linux kernel tree that require this function 424 should automatically select this option. Say N unless you 425 are compiling an out-of tree driver which tells you that it 426 depends on this. 427 428config GLOB_SELFTEST 429 bool "glob self-test on init" 430 default n 431 depends on GLOB 432 help 433 This option enables a simple self-test of the glob_match 434 function on startup. It is primarily useful for people 435 working on the code to ensure they haven't introduced any 436 regressions. 437 438 It only adds a little bit of code and slows kernel boot (or 439 module load) by a small amount, so you're welcome to play with 440 it, but you probably don't need it. 441 442# 443# Netlink attribute parsing support is select'ed if needed 444# 445config NLATTR 446 bool 447 448# 449# Generic 64-bit atomic support is selected if needed 450# 451config GENERIC_ATOMIC64 452 bool 453 454config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 455 def_bool y if GENERIC_ATOMIC64 456 457config LRU_CACHE 458 tristate 459 460config CLZ_TAB 461 bool 462 463config CORDIC 464 tristate "CORDIC algorithm" 465 help 466 This option provides an implementation of the CORDIC algorithm; 467 calculations are in fixed point. Module will be called cordic. 468 469config DDR 470 bool "JEDEC DDR data" 471 help 472 Data from JEDEC specs for DDR SDRAM memories, 473 particularly the AC timing parameters and addressing 474 information. This data is useful for drivers handling 475 DDR SDRAM controllers. 476 477config MPILIB 478 tristate 479 select CLZ_TAB 480 help 481 Multiprecision maths library from GnuPG. 482 It is used to implement RSA digital signature verification, 483 which is used by IMA/EVM digital signature extension. 484 485config SIGNATURE 486 tristate 487 depends on KEYS 488 select CRYPTO 489 select CRYPTO_SHA1 490 select MPILIB 491 help 492 Digital signature verification. Currently only RSA is supported. 493 Implementation is done using GnuPG MPI library 494 495# 496# libfdt files, only selected if needed. 497# 498config LIBFDT 499 bool 500 501config OID_REGISTRY 502 tristate 503 help 504 Enable fast lookup object identifier registry. 505 506config UCS2_STRING 507 tristate 508 509source "lib/fonts/Kconfig" 510 511config SG_SPLIT 512 def_bool n 513 help 514 Provides a heler to split scatterlists into chunks, each chunk being a 515 scatterlist. This should be selected by a driver or an API which 516 whishes to split a scatterlist amongst multiple DMA channel. 517 518# 519# sg chaining option 520# 521 522config ARCH_HAS_SG_CHAIN 523 def_bool n 524 525config ARCH_HAS_PMEM_API 526 bool 527 528config ARCH_HAS_MMIO_FLUSH 529 bool 530 531endmenu 532