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 STMP_DEVICE 50 bool 51 52config ARCH_USE_CMPXCHG_LOCKREF 53 bool 54 55config ARCH_HAS_FAST_MULTIPLIER 56 bool 57 58config INDIRECT_PIO 59 bool "Access I/O in non-MMIO mode" 60 depends on ARM64 61 help 62 On some platforms where no separate I/O space exists, there are I/O 63 hosts which can not be accessed in MMIO mode. Using the logical PIO 64 mechanism, the host-local I/O resource can be mapped into system 65 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the 66 system can access the I/O devices with the mapped-logic PIO through 67 I/O accessors. 68 69 This way has relatively little I/O performance cost. Please make 70 sure your devices really need this configure item enabled. 71 72 When in doubt, say N. 73 74config CRC_CCITT 75 tristate "CRC-CCITT functions" 76 help 77 This option is provided for the case where no in-kernel-tree 78 modules require CRC-CCITT functions, but a module built outside 79 the kernel tree does. Such modules that use library CRC-CCITT 80 functions require M here. 81 82config CRC16 83 tristate "CRC16 functions" 84 help 85 This option is provided for the case where no in-kernel-tree 86 modules require CRC16 functions, but a module built outside 87 the kernel tree does. Such modules that use library CRC16 88 functions require M here. 89 90config CRC_T10DIF 91 tristate "CRC calculation for the T10 Data Integrity Field" 92 select CRYPTO 93 select CRYPTO_CRCT10DIF 94 help 95 This option is only needed if a module that's not in the 96 kernel tree needs to calculate CRC checks for use with the 97 SCSI data integrity subsystem. 98 99config CRC_ITU_T 100 tristate "CRC ITU-T V.41 functions" 101 help 102 This option is provided for the case where no in-kernel-tree 103 modules require CRC ITU-T V.41 functions, but a module built outside 104 the kernel tree does. Such modules that use library CRC ITU-T V.41 105 functions require M here. 106 107config CRC32 108 tristate "CRC32/CRC32c functions" 109 default y 110 select BITREVERSE 111 help 112 This option is provided for the case where no in-kernel-tree 113 modules require CRC32/CRC32c functions, but a module built outside 114 the kernel tree does. Such modules that use library CRC32/CRC32c 115 functions require M here. 116 117config CRC32_SELFTEST 118 tristate "CRC32 perform self test on init" 119 depends on CRC32 120 help 121 This option enables the CRC32 library functions to perform a 122 self test on initialization. The self test computes crc32_le 123 and crc32_be over byte strings with random alignment and length 124 and computes the total elapsed time and number of bytes processed. 125 126choice 127 prompt "CRC32 implementation" 128 depends on CRC32 129 default CRC32_SLICEBY8 130 help 131 This option allows a kernel builder to override the default choice 132 of CRC32 algorithm. Choose the default ("slice by 8") unless you 133 know that you need one of the others. 134 135config CRC32_SLICEBY8 136 bool "Slice by 8 bytes" 137 help 138 Calculate checksum 8 bytes at a time with a clever slicing algorithm. 139 This is the fastest algorithm, but comes with a 8KiB lookup table. 140 Most modern processors have enough cache to hold this table without 141 thrashing the cache. 142 143 This is the default implementation choice. Choose this one unless 144 you have a good reason not to. 145 146config CRC32_SLICEBY4 147 bool "Slice by 4 bytes" 148 help 149 Calculate checksum 4 bytes at a time with a clever slicing algorithm. 150 This is a bit slower than slice by 8, but has a smaller 4KiB lookup 151 table. 152 153 Only choose this option if you know what you are doing. 154 155config CRC32_SARWATE 156 bool "Sarwate's Algorithm (one byte at a time)" 157 help 158 Calculate checksum a byte at a time using Sarwate's algorithm. This 159 is not particularly fast, but has a small 256 byte lookup table. 160 161 Only choose this option if you know what you are doing. 162 163config CRC32_BIT 164 bool "Classic Algorithm (one bit at a time)" 165 help 166 Calculate checksum one bit at a time. This is VERY slow, but has 167 no lookup table. This is provided as a debugging option. 168 169 Only choose this option if you are debugging crc32. 170 171endchoice 172 173config CRC64 174 tristate "CRC64 functions" 175 help 176 This option is provided for the case where no in-kernel-tree 177 modules require CRC64 functions, but a module built outside 178 the kernel tree does. Such modules that use library CRC64 179 functions require M here. 180 181config CRC4 182 tristate "CRC4 functions" 183 help 184 This option is provided for the case where no in-kernel-tree 185 modules require CRC4 functions, but a module built outside 186 the kernel tree does. Such modules that use library CRC4 187 functions require M here. 188 189config CRC7 190 tristate "CRC7 functions" 191 help 192 This option is provided for the case where no in-kernel-tree 193 modules require CRC7 functions, but a module built outside 194 the kernel tree does. Such modules that use library CRC7 195 functions require M here. 196 197config LIBCRC32C 198 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 199 select CRYPTO 200 select CRYPTO_CRC32C 201 help 202 This option is provided for the case where no in-kernel-tree 203 modules require CRC32c functions, but a module built outside the 204 kernel tree does. Such modules that use library CRC32c functions 205 require M here. See Castagnoli93. 206 Module will be libcrc32c. 207 208config CRC8 209 tristate "CRC8 function" 210 help 211 This option provides CRC8 function. Drivers may select this 212 when they need to do cyclic redundancy check according CRC8 213 algorithm. Module will be called crc8. 214 215config XXHASH 216 tristate 217 218config AUDIT_GENERIC 219 bool 220 depends on AUDIT && !AUDIT_ARCH 221 default y 222 223config AUDIT_ARCH_COMPAT_GENERIC 224 bool 225 default n 226 227config AUDIT_COMPAT_GENERIC 228 bool 229 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 230 default y 231 232config RANDOM32_SELFTEST 233 bool "PRNG perform self test on init" 234 help 235 This option enables the 32 bit PRNG library functions to perform a 236 self test on initialization. 237 238# 239# compression support is select'ed if needed 240# 241config 842_COMPRESS 242 select CRC32 243 tristate 244 245config 842_DECOMPRESS 246 select CRC32 247 tristate 248 249config ZLIB_INFLATE 250 tristate 251 252config ZLIB_DEFLATE 253 tristate 254 select BITREVERSE 255 256config LZO_COMPRESS 257 tristate 258 259config LZO_DECOMPRESS 260 tristate 261 262config LZ4_COMPRESS 263 tristate 264 265config LZ4HC_COMPRESS 266 tristate 267 268config LZ4_DECOMPRESS 269 tristate 270 271config ZSTD_COMPRESS 272 select XXHASH 273 tristate 274 275config ZSTD_DECOMPRESS 276 select XXHASH 277 tristate 278 279source "lib/xz/Kconfig" 280 281# 282# These all provide a common interface (hence the apparent duplication with 283# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 284# 285config DECOMPRESS_GZIP 286 select ZLIB_INFLATE 287 tristate 288 289config DECOMPRESS_BZIP2 290 tristate 291 292config DECOMPRESS_LZMA 293 tristate 294 295config DECOMPRESS_XZ 296 select XZ_DEC 297 tristate 298 299config DECOMPRESS_LZO 300 select LZO_DECOMPRESS 301 tristate 302 303config DECOMPRESS_LZ4 304 select LZ4_DECOMPRESS 305 tristate 306 307# 308# Generic allocator support is selected if needed 309# 310config GENERIC_ALLOCATOR 311 bool 312 313# 314# reed solomon support is select'ed if needed 315# 316config REED_SOLOMON 317 tristate 318 319config REED_SOLOMON_ENC8 320 bool 321 322config REED_SOLOMON_DEC8 323 bool 324 325config REED_SOLOMON_ENC16 326 bool 327 328config REED_SOLOMON_DEC16 329 bool 330 331# 332# BCH support is selected if needed 333# 334config BCH 335 tristate 336 337config BCH_CONST_PARAMS 338 bool 339 help 340 Drivers may select this option to force specific constant 341 values for parameters 'm' (Galois field order) and 't' 342 (error correction capability). Those specific values must 343 be set by declaring default values for symbols BCH_CONST_M 344 and BCH_CONST_T. 345 Doing so will enable extra compiler optimizations, 346 improving encoding and decoding performance up to 2x for 347 usual (m,t) values (typically such that m*t < 200). 348 When this option is selected, the BCH library supports 349 only a single (m,t) configuration. This is mainly useful 350 for NAND flash board drivers requiring known, fixed BCH 351 parameters. 352 353config BCH_CONST_M 354 int 355 range 5 15 356 help 357 Constant value for Galois field order 'm'. If 'k' is the 358 number of data bits to protect, 'm' should be chosen such 359 that (k + m*t) <= 2**m - 1. 360 Drivers should declare a default value for this symbol if 361 they select option BCH_CONST_PARAMS. 362 363config BCH_CONST_T 364 int 365 help 366 Constant value for error correction capability in bits 't'. 367 Drivers should declare a default value for this symbol if 368 they select option BCH_CONST_PARAMS. 369 370# 371# Textsearch support is select'ed if needed 372# 373config TEXTSEARCH 374 bool 375 376config TEXTSEARCH_KMP 377 tristate 378 379config TEXTSEARCH_BM 380 tristate 381 382config TEXTSEARCH_FSM 383 tristate 384 385config BTREE 386 bool 387 388config INTERVAL_TREE 389 bool 390 help 391 Simple, embeddable, interval-tree. Can find the start of an 392 overlapping range in log(n) time and then iterate over all 393 overlapping nodes. The algorithm is implemented as an 394 augmented rbtree. 395 396 See: 397 398 Documentation/rbtree.txt 399 400 for more information. 401 402config RADIX_TREE_MULTIORDER 403 bool 404 405config ASSOCIATIVE_ARRAY 406 bool 407 help 408 Generic associative array. Can be searched and iterated over whilst 409 it is being modified. It is also reasonably quick to search and 410 modify. The algorithms are non-recursive, and the trees are highly 411 capacious. 412 413 See: 414 415 Documentation/core-api/assoc_array.rst 416 417 for more information. 418 419config HAS_IOMEM 420 bool 421 depends on !NO_IOMEM 422 select GENERIC_IO 423 default y 424 425config HAS_IOPORT_MAP 426 bool 427 depends on HAS_IOMEM && !NO_IOPORT_MAP 428 default y 429 430source "kernel/dma/Kconfig" 431 432config SGL_ALLOC 433 bool 434 default n 435 436config IOMMU_HELPER 437 bool 438 439config CHECK_SIGNATURE 440 bool 441 442config CPUMASK_OFFSTACK 443 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 444 help 445 Use dynamic allocation for cpumask_var_t, instead of putting 446 them on the stack. This is a bit more expensive, but avoids 447 stack overflow. 448 449config CPU_RMAP 450 bool 451 depends on SMP 452 453config DQL 454 bool 455 456config GLOB 457 bool 458# This actually supports modular compilation, but the module overhead 459# is ridiculous for the amount of code involved. Until an out-of-tree 460# driver asks for it, we'll just link it directly it into the kernel 461# when required. Since we're ignoring out-of-tree users, there's also 462# no need bother prompting for a manual decision: 463# prompt "glob_match() function" 464 help 465 This option provides a glob_match function for performing 466 simple text pattern matching. It originated in the ATA code 467 to blacklist particular drive models, but other device drivers 468 may need similar functionality. 469 470 All drivers in the Linux kernel tree that require this function 471 should automatically select this option. Say N unless you 472 are compiling an out-of tree driver which tells you that it 473 depends on this. 474 475config GLOB_SELFTEST 476 tristate "glob self-test on init" 477 depends on GLOB 478 help 479 This option enables a simple self-test of the glob_match 480 function on startup. It is primarily useful for people 481 working on the code to ensure they haven't introduced any 482 regressions. 483 484 It only adds a little bit of code and slows kernel boot (or 485 module load) by a small amount, so you're welcome to play with 486 it, but you probably don't need it. 487 488# 489# Netlink attribute parsing support is select'ed if needed 490# 491config NLATTR 492 bool 493 494# 495# Generic 64-bit atomic support is selected if needed 496# 497config GENERIC_ATOMIC64 498 bool 499 500config LRU_CACHE 501 tristate 502 503config CLZ_TAB 504 bool 505 506config CORDIC 507 tristate "CORDIC algorithm" 508 help 509 This option provides an implementation of the CORDIC algorithm; 510 calculations are in fixed point. Module will be called cordic. 511 512config DDR 513 bool "JEDEC DDR data" 514 help 515 Data from JEDEC specs for DDR SDRAM memories, 516 particularly the AC timing parameters and addressing 517 information. This data is useful for drivers handling 518 DDR SDRAM controllers. 519 520config IRQ_POLL 521 bool "IRQ polling library" 522 help 523 Helper library to poll interrupt mitigation using polling. 524 525config MPILIB 526 tristate 527 select CLZ_TAB 528 help 529 Multiprecision maths library from GnuPG. 530 It is used to implement RSA digital signature verification, 531 which is used by IMA/EVM digital signature extension. 532 533config SIGNATURE 534 tristate 535 depends on KEYS 536 select CRYPTO 537 select CRYPTO_SHA1 538 select MPILIB 539 help 540 Digital signature verification. Currently only RSA is supported. 541 Implementation is done using GnuPG MPI library 542 543# 544# libfdt files, only selected if needed. 545# 546config LIBFDT 547 bool 548 549config OID_REGISTRY 550 tristate 551 help 552 Enable fast lookup object identifier registry. 553 554config UCS2_STRING 555 tristate 556 557source "lib/fonts/Kconfig" 558 559config SG_SPLIT 560 def_bool n 561 help 562 Provides a helper to split scatterlists into chunks, each chunk being 563 a scatterlist. This should be selected by a driver or an API which 564 whishes to split a scatterlist amongst multiple DMA channels. 565 566config SG_POOL 567 def_bool n 568 help 569 Provides a helper to allocate chained scatterlists. This should be 570 selected by a driver or an API which whishes to allocate chained 571 scatterlist. 572 573# 574# sg chaining option 575# 576 577config ARCH_HAS_SG_CHAIN 578 def_bool n 579 580config ARCH_HAS_PMEM_API 581 bool 582 583config ARCH_HAS_UACCESS_FLUSHCACHE 584 bool 585 586config ARCH_HAS_UACCESS_MCSAFE 587 bool 588 589config STACKDEPOT 590 bool 591 select STACKTRACE 592 593config SBITMAP 594 bool 595 596config PARMAN 597 tristate "parman" if COMPILE_TEST 598 599config PRIME_NUMBERS 600 tristate 601 602config STRING_SELFTEST 603 tristate "Test string functions" 604 605endmenu 606 607config GENERIC_LIB_ASHLDI3 608 bool 609 610config GENERIC_LIB_ASHRDI3 611 bool 612 613config GENERIC_LIB_LSHRDI3 614 bool 615 616config GENERIC_LIB_MULDI3 617 bool 618 619config GENERIC_LIB_CMPDI2 620 bool 621 622config GENERIC_LIB_UCMPDI2 623 bool 624