1# SPDX-License-Identifier: GPL-2.0-only 2# 3# Library configuration 4# 5 6config BINARY_PRINTF 7 def_bool n 8 9menu "Library routines" 10 11config RAID6_PQ 12 tristate 13 14config RAID6_PQ_BENCHMARK 15 bool "Automatically choose fastest RAID6 PQ functions" 16 depends on RAID6_PQ 17 default y 18 help 19 Benchmark all available RAID6 PQ functions on init and choose the 20 fastest one. 21 22config LINEAR_RANGES 23 tristate 24 25config PACKING 26 bool "Generic bitfield packing and unpacking" 27 default n 28 help 29 This option provides the packing() helper function, which permits 30 converting bitfields between a CPU-usable representation and a 31 memory representation that can have any combination of these quirks: 32 - Is little endian (bytes are reversed within a 32-bit group) 33 - The least-significant 32-bit word comes first (within a 64-bit 34 group) 35 - The most significant bit of a byte is at its right (bit 0 of a 36 register description is numerically 2^7). 37 Drivers may use these helpers to match the bit indices as described 38 in the data sheets of the peripherals they are in control of. 39 40 When in doubt, say N. 41 42config BITREVERSE 43 tristate 44 45config HAVE_ARCH_BITREVERSE 46 bool 47 default n 48 help 49 This option enables the use of hardware bit-reversal instructions on 50 architectures which support such operations. 51 52config ARCH_HAS_STRNCPY_FROM_USER 53 bool 54 55config ARCH_HAS_STRNLEN_USER 56 bool 57 58config GENERIC_STRNCPY_FROM_USER 59 def_bool !ARCH_HAS_STRNCPY_FROM_USER 60 61config GENERIC_STRNLEN_USER 62 def_bool !ARCH_HAS_STRNLEN_USER 63 64config GENERIC_NET_UTILS 65 bool 66 67source "lib/math/Kconfig" 68 69config NO_GENERIC_PCI_IOPORT_MAP 70 bool 71 72config GENERIC_PCI_IOMAP 73 bool 74 75config GENERIC_IOMAP 76 bool 77 select GENERIC_PCI_IOMAP 78 79config STMP_DEVICE 80 bool 81 82config ARCH_USE_CMPXCHG_LOCKREF 83 bool 84 85config ARCH_HAS_FAST_MULTIPLIER 86 bool 87 88config ARCH_USE_SYM_ANNOTATIONS 89 bool 90 91config INDIRECT_PIO 92 bool "Access I/O in non-MMIO mode" 93 depends on ARM64 94 help 95 On some platforms where no separate I/O space exists, there are I/O 96 hosts which can not be accessed in MMIO mode. Using the logical PIO 97 mechanism, the host-local I/O resource can be mapped into system 98 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the 99 system can access the I/O devices with the mapped-logic PIO through 100 I/O accessors. 101 102 This way has relatively little I/O performance cost. Please make 103 sure your devices really need this configure item enabled. 104 105 When in doubt, say N. 106 107config INDIRECT_IOMEM 108 bool 109 help 110 This is selected by other options/architectures to provide the 111 emulated iomem accessors. 112 113config INDIRECT_IOMEM_FALLBACK 114 bool 115 depends on INDIRECT_IOMEM 116 help 117 If INDIRECT_IOMEM is selected, this enables falling back to plain 118 mmio accesses when the IO memory address is not a registered 119 emulated region. 120 121config TRACE_MMIO_ACCESS 122 bool "Register read/write tracing" 123 depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS 124 help 125 Create tracepoints for MMIO read/write operations. These trace events 126 can be used for logging all MMIO read/write operations. 127 128source "lib/crypto/Kconfig" 129 130config LIB_MEMNEQ 131 bool 132 133config CRC_CCITT 134 tristate "CRC-CCITT functions" 135 help 136 This option is provided for the case where no in-kernel-tree 137 modules require CRC-CCITT functions, but a module built outside 138 the kernel tree does. Such modules that use library CRC-CCITT 139 functions require M here. 140 141config CRC16 142 tristate "CRC16 functions" 143 help 144 This option is provided for the case where no in-kernel-tree 145 modules require CRC16 functions, but a module built outside 146 the kernel tree does. Such modules that use library CRC16 147 functions require M here. 148 149config CRC_T10DIF 150 tristate "CRC calculation for the T10 Data Integrity Field" 151 select CRYPTO 152 select CRYPTO_CRCT10DIF 153 help 154 This option is only needed if a module that's not in the 155 kernel tree needs to calculate CRC checks for use with the 156 SCSI data integrity subsystem. 157 158config CRC64_ROCKSOFT 159 tristate "CRC calculation for the Rocksoft model CRC64" 160 select CRC64 161 select CRYPTO 162 select CRYPTO_CRC64_ROCKSOFT 163 help 164 This option provides a CRC64 API to a registered crypto driver. 165 This is used with the block layer's data integrity subsystem. 166 167config CRC_ITU_T 168 tristate "CRC ITU-T V.41 functions" 169 help 170 This option is provided for the case where no in-kernel-tree 171 modules require CRC ITU-T V.41 functions, but a module built outside 172 the kernel tree does. Such modules that use library CRC ITU-T V.41 173 functions require M here. 174 175config CRC32 176 tristate "CRC32/CRC32c functions" 177 default y 178 select BITREVERSE 179 help 180 This option is provided for the case where no in-kernel-tree 181 modules require CRC32/CRC32c functions, but a module built outside 182 the kernel tree does. Such modules that use library CRC32/CRC32c 183 functions require M here. 184 185config CRC32_SELFTEST 186 tristate "CRC32 perform self test on init" 187 depends on CRC32 188 help 189 This option enables the CRC32 library functions to perform a 190 self test on initialization. The self test computes crc32_le 191 and crc32_be over byte strings with random alignment and length 192 and computes the total elapsed time and number of bytes processed. 193 194choice 195 prompt "CRC32 implementation" 196 depends on CRC32 197 default CRC32_SLICEBY8 198 help 199 This option allows a kernel builder to override the default choice 200 of CRC32 algorithm. Choose the default ("slice by 8") unless you 201 know that you need one of the others. 202 203config CRC32_SLICEBY8 204 bool "Slice by 8 bytes" 205 help 206 Calculate checksum 8 bytes at a time with a clever slicing algorithm. 207 This is the fastest algorithm, but comes with a 8KiB lookup table. 208 Most modern processors have enough cache to hold this table without 209 thrashing the cache. 210 211 This is the default implementation choice. Choose this one unless 212 you have a good reason not to. 213 214config CRC32_SLICEBY4 215 bool "Slice by 4 bytes" 216 help 217 Calculate checksum 4 bytes at a time with a clever slicing algorithm. 218 This is a bit slower than slice by 8, but has a smaller 4KiB lookup 219 table. 220 221 Only choose this option if you know what you are doing. 222 223config CRC32_SARWATE 224 bool "Sarwate's Algorithm (one byte at a time)" 225 help 226 Calculate checksum a byte at a time using Sarwate's algorithm. This 227 is not particularly fast, but has a small 256 byte lookup table. 228 229 Only choose this option if you know what you are doing. 230 231config CRC32_BIT 232 bool "Classic Algorithm (one bit at a time)" 233 help 234 Calculate checksum one bit at a time. This is VERY slow, but has 235 no lookup table. This is provided as a debugging option. 236 237 Only choose this option if you are debugging crc32. 238 239endchoice 240 241config CRC64 242 tristate "CRC64 functions" 243 help 244 This option is provided for the case where no in-kernel-tree 245 modules require CRC64 functions, but a module built outside 246 the kernel tree does. Such modules that use library CRC64 247 functions require M here. 248 249config CRC4 250 tristate "CRC4 functions" 251 help 252 This option is provided for the case where no in-kernel-tree 253 modules require CRC4 functions, but a module built outside 254 the kernel tree does. Such modules that use library CRC4 255 functions require M here. 256 257config CRC7 258 tristate "CRC7 functions" 259 help 260 This option is provided for the case where no in-kernel-tree 261 modules require CRC7 functions, but a module built outside 262 the kernel tree does. Such modules that use library CRC7 263 functions require M here. 264 265config LIBCRC32C 266 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 267 select CRYPTO 268 select CRYPTO_CRC32C 269 help 270 This option is provided for the case where no in-kernel-tree 271 modules require CRC32c functions, but a module built outside the 272 kernel tree does. Such modules that use library CRC32c functions 273 require M here. See Castagnoli93. 274 Module will be libcrc32c. 275 276config CRC8 277 tristate "CRC8 function" 278 help 279 This option provides CRC8 function. Drivers may select this 280 when they need to do cyclic redundancy check according CRC8 281 algorithm. Module will be called crc8. 282 283config XXHASH 284 tristate 285 286config AUDIT_GENERIC 287 bool 288 depends on AUDIT && !AUDIT_ARCH 289 default y 290 291config AUDIT_ARCH_COMPAT_GENERIC 292 bool 293 default n 294 295config AUDIT_COMPAT_GENERIC 296 bool 297 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 298 default y 299 300config RANDOM32_SELFTEST 301 bool "PRNG perform self test on init" 302 help 303 This option enables the 32 bit PRNG library functions to perform a 304 self test on initialization. 305 306# 307# compression support is select'ed if needed 308# 309config 842_COMPRESS 310 select CRC32 311 tristate 312 313config 842_DECOMPRESS 314 select CRC32 315 tristate 316 317config ZLIB_INFLATE 318 tristate 319 320config ZLIB_DEFLATE 321 tristate 322 select BITREVERSE 323 324config ZLIB_DFLTCC 325 def_bool y 326 depends on S390 327 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib" 328 help 329 Enable s390x hardware support for zlib in the kernel. 330 331config LZO_COMPRESS 332 tristate 333 334config LZO_DECOMPRESS 335 tristate 336 337config LZ4_COMPRESS 338 tristate 339 340config LZ4HC_COMPRESS 341 tristate 342 343config LZ4_DECOMPRESS 344 tristate 345 346config ZSTD_COMMON 347 select XXHASH 348 tristate 349 350config ZSTD_COMPRESS 351 select ZSTD_COMMON 352 tristate 353 354config ZSTD_DECOMPRESS 355 select ZSTD_COMMON 356 tristate 357 358source "lib/xz/Kconfig" 359 360# 361# These all provide a common interface (hence the apparent duplication with 362# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 363# 364config DECOMPRESS_GZIP 365 select ZLIB_INFLATE 366 tristate 367 368config DECOMPRESS_BZIP2 369 tristate 370 371config DECOMPRESS_LZMA 372 tristate 373 374config DECOMPRESS_XZ 375 select XZ_DEC 376 tristate 377 378config DECOMPRESS_LZO 379 select LZO_DECOMPRESS 380 tristate 381 382config DECOMPRESS_LZ4 383 select LZ4_DECOMPRESS 384 tristate 385 386config DECOMPRESS_ZSTD 387 select ZSTD_DECOMPRESS 388 tristate 389 390# 391# Generic allocator support is selected if needed 392# 393config GENERIC_ALLOCATOR 394 bool 395 396# 397# reed solomon support is select'ed if needed 398# 399config REED_SOLOMON 400 tristate 401 402config REED_SOLOMON_ENC8 403 bool 404 405config REED_SOLOMON_DEC8 406 bool 407 408config REED_SOLOMON_ENC16 409 bool 410 411config REED_SOLOMON_DEC16 412 bool 413 414# 415# BCH support is selected if needed 416# 417config BCH 418 tristate 419 420config BCH_CONST_PARAMS 421 bool 422 help 423 Drivers may select this option to force specific constant 424 values for parameters 'm' (Galois field order) and 't' 425 (error correction capability). Those specific values must 426 be set by declaring default values for symbols BCH_CONST_M 427 and BCH_CONST_T. 428 Doing so will enable extra compiler optimizations, 429 improving encoding and decoding performance up to 2x for 430 usual (m,t) values (typically such that m*t < 200). 431 When this option is selected, the BCH library supports 432 only a single (m,t) configuration. This is mainly useful 433 for NAND flash board drivers requiring known, fixed BCH 434 parameters. 435 436config BCH_CONST_M 437 int 438 range 5 15 439 help 440 Constant value for Galois field order 'm'. If 'k' is the 441 number of data bits to protect, 'm' should be chosen such 442 that (k + m*t) <= 2**m - 1. 443 Drivers should declare a default value for this symbol if 444 they select option BCH_CONST_PARAMS. 445 446config BCH_CONST_T 447 int 448 help 449 Constant value for error correction capability in bits 't'. 450 Drivers should declare a default value for this symbol if 451 they select option BCH_CONST_PARAMS. 452 453# 454# Textsearch support is select'ed if needed 455# 456config TEXTSEARCH 457 bool 458 459config TEXTSEARCH_KMP 460 tristate 461 462config TEXTSEARCH_BM 463 tristate 464 465config TEXTSEARCH_FSM 466 tristate 467 468config BTREE 469 bool 470 471config INTERVAL_TREE 472 bool 473 help 474 Simple, embeddable, interval-tree. Can find the start of an 475 overlapping range in log(n) time and then iterate over all 476 overlapping nodes. The algorithm is implemented as an 477 augmented rbtree. 478 479 See: 480 481 Documentation/core-api/rbtree.rst 482 483 for more information. 484 485config XARRAY_MULTI 486 bool 487 help 488 Support entries which occupy multiple consecutive indices in the 489 XArray. 490 491config ASSOCIATIVE_ARRAY 492 bool 493 help 494 Generic associative array. Can be searched and iterated over whilst 495 it is being modified. It is also reasonably quick to search and 496 modify. The algorithms are non-recursive, and the trees are highly 497 capacious. 498 499 See: 500 501 Documentation/core-api/assoc_array.rst 502 503 for more information. 504 505config HAS_IOMEM 506 bool 507 depends on !NO_IOMEM 508 default y 509 510config HAS_IOPORT_MAP 511 bool 512 depends on HAS_IOMEM && !NO_IOPORT_MAP 513 default y 514 515source "kernel/dma/Kconfig" 516 517config SGL_ALLOC 518 bool 519 default n 520 521config IOMMU_HELPER 522 bool 523 524config CHECK_SIGNATURE 525 bool 526 527config CPUMASK_OFFSTACK 528 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 529 help 530 Use dynamic allocation for cpumask_var_t, instead of putting 531 them on the stack. This is a bit more expensive, but avoids 532 stack overflow. 533 534config CPU_RMAP 535 bool 536 depends on SMP 537 538config DQL 539 bool 540 541config GLOB 542 bool 543# This actually supports modular compilation, but the module overhead 544# is ridiculous for the amount of code involved. Until an out-of-tree 545# driver asks for it, we'll just link it directly it into the kernel 546# when required. Since we're ignoring out-of-tree users, there's also 547# no need bother prompting for a manual decision: 548# prompt "glob_match() function" 549 help 550 This option provides a glob_match function for performing 551 simple text pattern matching. It originated in the ATA code 552 to blacklist particular drive models, but other device drivers 553 may need similar functionality. 554 555 All drivers in the Linux kernel tree that require this function 556 should automatically select this option. Say N unless you 557 are compiling an out-of tree driver which tells you that it 558 depends on this. 559 560config GLOB_SELFTEST 561 tristate "glob self-test on init" 562 depends on GLOB 563 help 564 This option enables a simple self-test of the glob_match 565 function on startup. It is primarily useful for people 566 working on the code to ensure they haven't introduced any 567 regressions. 568 569 It only adds a little bit of code and slows kernel boot (or 570 module load) by a small amount, so you're welcome to play with 571 it, but you probably don't need it. 572 573# 574# Netlink attribute parsing support is select'ed if needed 575# 576config NLATTR 577 bool 578 579# 580# Generic 64-bit atomic support is selected if needed 581# 582config GENERIC_ATOMIC64 583 bool 584 585config LRU_CACHE 586 tristate 587 588config CLZ_TAB 589 bool 590 591config IRQ_POLL 592 bool "IRQ polling library" 593 help 594 Helper library to poll interrupt mitigation using polling. 595 596config MPILIB 597 tristate 598 select CLZ_TAB 599 help 600 Multiprecision maths library from GnuPG. 601 It is used to implement RSA digital signature verification, 602 which is used by IMA/EVM digital signature extension. 603 604config SIGNATURE 605 tristate 606 depends on KEYS 607 select CRYPTO 608 select CRYPTO_SHA1 609 select MPILIB 610 help 611 Digital signature verification. Currently only RSA is supported. 612 Implementation is done using GnuPG MPI library 613 614config DIMLIB 615 bool 616 help 617 Dynamic Interrupt Moderation library. 618 Implements an algorithm for dynamically changing CQ moderation values 619 according to run time performance. 620 621# 622# libfdt files, only selected if needed. 623# 624config LIBFDT 625 bool 626 627config OID_REGISTRY 628 tristate 629 help 630 Enable fast lookup object identifier registry. 631 632config UCS2_STRING 633 tristate 634 635# 636# generic vdso 637# 638source "lib/vdso/Kconfig" 639 640source "lib/fonts/Kconfig" 641 642config SG_SPLIT 643 def_bool n 644 help 645 Provides a helper to split scatterlists into chunks, each chunk being 646 a scatterlist. This should be selected by a driver or an API which 647 whishes to split a scatterlist amongst multiple DMA channels. 648 649config SG_POOL 650 def_bool n 651 help 652 Provides a helper to allocate chained scatterlists. This should be 653 selected by a driver or an API which whishes to allocate chained 654 scatterlist. 655 656# 657# sg chaining option 658# 659 660config ARCH_NO_SG_CHAIN 661 def_bool n 662 663config ARCH_HAS_PMEM_API 664 bool 665 666config MEMREGION 667 bool 668 669config ARCH_HAS_MEMREMAP_COMPAT_ALIGN 670 bool 671 672# use memcpy to implement user copies for nommu architectures 673config UACCESS_MEMCPY 674 bool 675 676config ARCH_HAS_UACCESS_FLUSHCACHE 677 bool 678 679# arch has a concept of a recoverable synchronous exception due to a 680# memory-read error like x86 machine-check or ARM data-abort, and 681# implements copy_mc_to_{user,kernel} to abort and report 682# 'bytes-transferred' if that exception fires when accessing the source 683# buffer. 684config ARCH_HAS_COPY_MC 685 bool 686 687# Temporary. Goes away when all archs are cleaned up 688config ARCH_STACKWALK 689 bool 690 691config STACKDEPOT 692 bool 693 select STACKTRACE 694 695config STACKDEPOT_ALWAYS_INIT 696 bool 697 select STACKDEPOT 698 699config REF_TRACKER 700 bool 701 depends on STACKTRACE_SUPPORT 702 select STACKDEPOT 703 704config SBITMAP 705 bool 706 707config PARMAN 708 tristate "parman" if COMPILE_TEST 709 710config OBJAGG 711 tristate "objagg" if COMPILE_TEST 712 713endmenu 714 715config GENERIC_IOREMAP 716 bool 717 718config GENERIC_LIB_ASHLDI3 719 bool 720 721config GENERIC_LIB_ASHRDI3 722 bool 723 724config GENERIC_LIB_LSHRDI3 725 bool 726 727config GENERIC_LIB_MULDI3 728 bool 729 730config GENERIC_LIB_CMPDI2 731 bool 732 733config GENERIC_LIB_UCMPDI2 734 bool 735 736config GENERIC_LIB_DEVMEM_IS_ALLOWED 737 bool 738 739config PLDMFW 740 bool 741 default n 742 743config ASN1_ENCODER 744 tristate 745 746config POLYNOMIAL 747 tristate 748