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 select BITREVERSE 28 default n 29 help 30 This option provides the packing() helper function, which permits 31 converting bitfields between a CPU-usable representation and a 32 memory representation that can have any combination of these quirks: 33 - Is little endian (bytes are reversed within a 32-bit group) 34 - The least-significant 32-bit word comes first (within a 64-bit 35 group) 36 - The most significant bit of a byte is at its right (bit 0 of a 37 register description is numerically 2^7). 38 Drivers may use these helpers to match the bit indices as described 39 in the data sheets of the peripherals they are in control of. 40 41 When in doubt, say N. 42 43config BITREVERSE 44 tristate 45 46config HAVE_ARCH_BITREVERSE 47 bool 48 default n 49 help 50 This option enables the use of hardware bit-reversal instructions on 51 architectures which support such operations. 52 53config ARCH_HAS_STRNCPY_FROM_USER 54 bool 55 56config ARCH_HAS_STRNLEN_USER 57 bool 58 59config GENERIC_STRNCPY_FROM_USER 60 def_bool !ARCH_HAS_STRNCPY_FROM_USER 61 62config GENERIC_STRNLEN_USER 63 def_bool !ARCH_HAS_STRNLEN_USER 64 65config GENERIC_NET_UTILS 66 bool 67 68source "lib/math/Kconfig" 69 70config NO_GENERIC_PCI_IOPORT_MAP 71 bool 72 73config GENERIC_IOMAP 74 bool 75 select GENERIC_PCI_IOMAP 76 77config STMP_DEVICE 78 bool 79 80config ARCH_USE_CMPXCHG_LOCKREF 81 bool 82 83config ARCH_HAS_FAST_MULTIPLIER 84 bool 85 86config ARCH_USE_SYM_ANNOTATIONS 87 bool 88 89config INDIRECT_PIO 90 bool "Access I/O in non-MMIO mode" 91 depends on ARM64 92 depends on HAS_IOPORT 93 help 94 On some platforms where no separate I/O space exists, there are I/O 95 hosts which can not be accessed in MMIO mode. Using the logical PIO 96 mechanism, the host-local I/O resource can be mapped into system 97 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the 98 system can access the I/O devices with the mapped-logic PIO through 99 I/O accessors. 100 101 This way has relatively little I/O performance cost. Please make 102 sure your devices really need this configure item enabled. 103 104 When in doubt, say N. 105 106config INDIRECT_IOMEM 107 bool 108 help 109 This is selected by other options/architectures to provide the 110 emulated iomem accessors. 111 112config INDIRECT_IOMEM_FALLBACK 113 bool 114 depends on INDIRECT_IOMEM 115 help 116 If INDIRECT_IOMEM is selected, this enables falling back to plain 117 mmio accesses when the IO memory address is not a registered 118 emulated region. 119 120config TRACE_MMIO_ACCESS 121 bool "Register read/write tracing" 122 depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS 123 help 124 Create tracepoints for MMIO read/write operations. These trace events 125 can be used for logging all MMIO read/write operations. 126 127source "lib/crypto/Kconfig" 128 129config CRC_CCITT 130 tristate "CRC-CCITT functions" 131 help 132 This option is provided for the case where no in-kernel-tree 133 modules require CRC-CCITT functions, but a module built outside 134 the kernel tree does. Such modules that use library CRC-CCITT 135 functions require M here. 136 137config CRC16 138 tristate "CRC16 functions" 139 help 140 This option is provided for the case where no in-kernel-tree 141 modules require CRC16 functions, but a module built outside 142 the kernel tree does. Such modules that use library CRC16 143 functions require M here. 144 145config CRC_T10DIF 146 tristate "CRC calculation for the T10 Data Integrity Field" 147 select CRYPTO 148 select CRYPTO_CRCT10DIF 149 help 150 This option is only needed if a module that's not in the 151 kernel tree needs to calculate CRC checks for use with the 152 SCSI data integrity subsystem. 153 154config CRC64_ROCKSOFT 155 tristate "CRC calculation for the Rocksoft model CRC64" 156 select CRC64 157 select CRYPTO 158 select CRYPTO_CRC64_ROCKSOFT 159 help 160 This option provides a CRC64 API to a registered crypto driver. 161 This is used with the block layer's data integrity subsystem. 162 163config CRC_ITU_T 164 tristate "CRC ITU-T V.41 functions" 165 help 166 This option is provided for the case where no in-kernel-tree 167 modules require CRC ITU-T V.41 functions, but a module built outside 168 the kernel tree does. Such modules that use library CRC ITU-T V.41 169 functions require M here. 170 171config CRC32 172 tristate "CRC32/CRC32c functions" 173 default y 174 select BITREVERSE 175 help 176 This option is provided for the case where no in-kernel-tree 177 modules require CRC32/CRC32c functions, but a module built outside 178 the kernel tree does. Such modules that use library CRC32/CRC32c 179 functions require M here. 180 181config CRC32_SELFTEST 182 tristate "CRC32 perform self test on init" 183 depends on CRC32 184 help 185 This option enables the CRC32 library functions to perform a 186 self test on initialization. The self test computes crc32_le 187 and crc32_be over byte strings with random alignment and length 188 and computes the total elapsed time and number of bytes processed. 189 190choice 191 prompt "CRC32 implementation" 192 depends on CRC32 193 default CRC32_SLICEBY8 194 help 195 This option allows a kernel builder to override the default choice 196 of CRC32 algorithm. Choose the default ("slice by 8") unless you 197 know that you need one of the others. 198 199config CRC32_SLICEBY8 200 bool "Slice by 8 bytes" 201 help 202 Calculate checksum 8 bytes at a time with a clever slicing algorithm. 203 This is the fastest algorithm, but comes with a 8KiB lookup table. 204 Most modern processors have enough cache to hold this table without 205 thrashing the cache. 206 207 This is the default implementation choice. Choose this one unless 208 you have a good reason not to. 209 210config CRC32_SLICEBY4 211 bool "Slice by 4 bytes" 212 help 213 Calculate checksum 4 bytes at a time with a clever slicing algorithm. 214 This is a bit slower than slice by 8, but has a smaller 4KiB lookup 215 table. 216 217 Only choose this option if you know what you are doing. 218 219config CRC32_SARWATE 220 bool "Sarwate's Algorithm (one byte at a time)" 221 help 222 Calculate checksum a byte at a time using Sarwate's algorithm. This 223 is not particularly fast, but has a small 256 byte lookup table. 224 225 Only choose this option if you know what you are doing. 226 227config CRC32_BIT 228 bool "Classic Algorithm (one bit at a time)" 229 help 230 Calculate checksum one bit at a time. This is VERY slow, but has 231 no lookup table. This is provided as a debugging option. 232 233 Only choose this option if you are debugging crc32. 234 235endchoice 236 237config CRC64 238 tristate "CRC64 functions" 239 help 240 This option is provided for the case where no in-kernel-tree 241 modules require CRC64 functions, but a module built outside 242 the kernel tree does. Such modules that use library CRC64 243 functions require M here. 244 245config CRC4 246 tristate "CRC4 functions" 247 help 248 This option is provided for the case where no in-kernel-tree 249 modules require CRC4 functions, but a module built outside 250 the kernel tree does. Such modules that use library CRC4 251 functions require M here. 252 253config CRC7 254 tristate "CRC7 functions" 255 help 256 This option is provided for the case where no in-kernel-tree 257 modules require CRC7 functions, but a module built outside 258 the kernel tree does. Such modules that use library CRC7 259 functions require M here. 260 261config LIBCRC32C 262 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 263 select CRYPTO 264 select CRYPTO_CRC32C 265 help 266 This option is provided for the case where no in-kernel-tree 267 modules require CRC32c functions, but a module built outside the 268 kernel tree does. Such modules that use library CRC32c functions 269 require M here. See Castagnoli93. 270 Module will be libcrc32c. 271 272config CRC8 273 tristate "CRC8 function" 274 help 275 This option provides CRC8 function. Drivers may select this 276 when they need to do cyclic redundancy check according CRC8 277 algorithm. Module will be called crc8. 278 279config XXHASH 280 tristate 281 282config AUDIT_GENERIC 283 bool 284 depends on AUDIT && !AUDIT_ARCH 285 default y 286 287config AUDIT_ARCH_COMPAT_GENERIC 288 bool 289 default n 290 291config AUDIT_COMPAT_GENERIC 292 bool 293 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 294 default y 295 296config RANDOM32_SELFTEST 297 bool "PRNG perform self test on init" 298 help 299 This option enables the 32 bit PRNG library functions to perform a 300 self test on initialization. 301 302# 303# compression support is select'ed if needed 304# 305config 842_COMPRESS 306 select CRC32 307 tristate 308 309config 842_DECOMPRESS 310 select CRC32 311 tristate 312 313config ZLIB_INFLATE 314 tristate 315 316config ZLIB_DEFLATE 317 tristate 318 select BITREVERSE 319 320config ZLIB_DFLTCC 321 def_bool y 322 depends on S390 323 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib" 324 help 325 Enable s390x hardware support for zlib in the kernel. 326 327config LZO_COMPRESS 328 tristate 329 330config LZO_DECOMPRESS 331 tristate 332 333config LZ4_COMPRESS 334 tristate 335 336config LZ4HC_COMPRESS 337 tristate 338 339config LZ4_DECOMPRESS 340 tristate 341 342config ZSTD_COMMON 343 select XXHASH 344 tristate 345 346config ZSTD_COMPRESS 347 select ZSTD_COMMON 348 tristate 349 350config ZSTD_DECOMPRESS 351 select ZSTD_COMMON 352 tristate 353 354source "lib/xz/Kconfig" 355 356# 357# These all provide a common interface (hence the apparent duplication with 358# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 359# 360config DECOMPRESS_GZIP 361 select ZLIB_INFLATE 362 tristate 363 364config DECOMPRESS_BZIP2 365 tristate 366 367config DECOMPRESS_LZMA 368 tristate 369 370config DECOMPRESS_XZ 371 select XZ_DEC 372 tristate 373 374config DECOMPRESS_LZO 375 select LZO_DECOMPRESS 376 tristate 377 378config DECOMPRESS_LZ4 379 select LZ4_DECOMPRESS 380 tristate 381 382config DECOMPRESS_ZSTD 383 select ZSTD_DECOMPRESS 384 tristate 385 386# 387# Generic allocator support is selected if needed 388# 389config GENERIC_ALLOCATOR 390 bool 391 392# 393# reed solomon support is select'ed if needed 394# 395config REED_SOLOMON 396 tristate 397 398config REED_SOLOMON_ENC8 399 bool 400 401config REED_SOLOMON_DEC8 402 bool 403 404config REED_SOLOMON_ENC16 405 bool 406 407config REED_SOLOMON_DEC16 408 bool 409 410# 411# BCH support is selected if needed 412# 413config BCH 414 tristate 415 select BITREVERSE 416 417config BCH_CONST_PARAMS 418 bool 419 help 420 Drivers may select this option to force specific constant 421 values for parameters 'm' (Galois field order) and 't' 422 (error correction capability). Those specific values must 423 be set by declaring default values for symbols BCH_CONST_M 424 and BCH_CONST_T. 425 Doing so will enable extra compiler optimizations, 426 improving encoding and decoding performance up to 2x for 427 usual (m,t) values (typically such that m*t < 200). 428 When this option is selected, the BCH library supports 429 only a single (m,t) configuration. This is mainly useful 430 for NAND flash board drivers requiring known, fixed BCH 431 parameters. 432 433config BCH_CONST_M 434 int 435 range 5 15 436 help 437 Constant value for Galois field order 'm'. If 'k' is the 438 number of data bits to protect, 'm' should be chosen such 439 that (k + m*t) <= 2**m - 1. 440 Drivers should declare a default value for this symbol if 441 they select option BCH_CONST_PARAMS. 442 443config BCH_CONST_T 444 int 445 help 446 Constant value for error correction capability in bits 't'. 447 Drivers should declare a default value for this symbol if 448 they select option BCH_CONST_PARAMS. 449 450# 451# Textsearch support is select'ed if needed 452# 453config TEXTSEARCH 454 bool 455 456config TEXTSEARCH_KMP 457 tristate 458 459config TEXTSEARCH_BM 460 tristate 461 462config TEXTSEARCH_FSM 463 tristate 464 465config BTREE 466 bool 467 468config INTERVAL_TREE 469 bool 470 help 471 Simple, embeddable, interval-tree. Can find the start of an 472 overlapping range in log(n) time and then iterate over all 473 overlapping nodes. The algorithm is implemented as an 474 augmented rbtree. 475 476 See: 477 478 Documentation/core-api/rbtree.rst 479 480 for more information. 481 482config INTERVAL_TREE_SPAN_ITER 483 bool 484 depends on INTERVAL_TREE 485 486config XARRAY_MULTI 487 bool 488 help 489 Support entries which occupy multiple consecutive indices in the 490 XArray. 491 492config ASSOCIATIVE_ARRAY 493 bool 494 help 495 Generic associative array. Can be searched and iterated over whilst 496 it is being modified. It is also reasonably quick to search and 497 modify. The algorithms are non-recursive, and the trees are highly 498 capacious. 499 500 See: 501 502 Documentation/core-api/assoc_array.rst 503 504 for more information. 505 506config CLOSURES 507 bool 508 509config HAS_IOMEM 510 bool 511 depends on !NO_IOMEM 512 default y 513 514config HAS_IOPORT 515 bool 516 517config HAS_IOPORT_MAP 518 bool 519 depends on HAS_IOMEM && !NO_IOPORT_MAP 520 default y 521 522source "kernel/dma/Kconfig" 523 524config SGL_ALLOC 525 bool 526 default n 527 528config IOMMU_HELPER 529 bool 530 531config CHECK_SIGNATURE 532 bool 533 534config CPUMASK_OFFSTACK 535 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 536 help 537 Use dynamic allocation for cpumask_var_t, instead of putting 538 them on the stack. This is a bit more expensive, but avoids 539 stack overflow. 540 541config FORCE_NR_CPUS 542 bool "Set number of CPUs at compile time" 543 depends on SMP && EXPERT && !COMPILE_TEST 544 help 545 Say Yes if you have NR_CPUS set to an actual number of possible 546 CPUs in your system, not to a default value. This forces the core 547 code to rely on compile-time value and optimize kernel routines 548 better. 549 550config CPU_RMAP 551 bool 552 depends on SMP 553 554config DQL 555 bool 556 557config GLOB 558 bool 559# This actually supports modular compilation, but the module overhead 560# is ridiculous for the amount of code involved. Until an out-of-tree 561# driver asks for it, we'll just link it directly it into the kernel 562# when required. Since we're ignoring out-of-tree users, there's also 563# no need bother prompting for a manual decision: 564# prompt "glob_match() function" 565 help 566 This option provides a glob_match function for performing 567 simple text pattern matching. It originated in the ATA code 568 to blacklist particular drive models, but other device drivers 569 may need similar functionality. 570 571 All drivers in the Linux kernel tree that require this function 572 should automatically select this option. Say N unless you 573 are compiling an out-of tree driver which tells you that it 574 depends on this. 575 576config GLOB_SELFTEST 577 tristate "glob self-test on init" 578 depends on GLOB 579 help 580 This option enables a simple self-test of the glob_match 581 function on startup. It is primarily useful for people 582 working on the code to ensure they haven't introduced any 583 regressions. 584 585 It only adds a little bit of code and slows kernel boot (or 586 module load) by a small amount, so you're welcome to play with 587 it, but you probably don't need it. 588 589# 590# Netlink attribute parsing support is select'ed if needed 591# 592config NLATTR 593 bool 594 595# 596# Generic 64-bit atomic support is selected if needed 597# 598config GENERIC_ATOMIC64 599 bool 600 601config LRU_CACHE 602 tristate 603 604config CLZ_TAB 605 bool 606 607config IRQ_POLL 608 bool "IRQ polling library" 609 help 610 Helper library to poll interrupt mitigation using polling. 611 612config MPILIB 613 tristate 614 select CLZ_TAB 615 help 616 Multiprecision maths library from GnuPG. 617 It is used to implement RSA digital signature verification, 618 which is used by IMA/EVM digital signature extension. 619 620config SIGNATURE 621 tristate 622 depends on KEYS 623 select CRYPTO 624 select CRYPTO_SHA1 625 select MPILIB 626 help 627 Digital signature verification. Currently only RSA is supported. 628 Implementation is done using GnuPG MPI library 629 630config DIMLIB 631 tristate 632 help 633 Dynamic Interrupt Moderation library. 634 Implements an algorithm for dynamically changing CQ moderation values 635 according to run time performance. 636 637# 638# libfdt files, only selected if needed. 639# 640config LIBFDT 641 bool 642 643config OID_REGISTRY 644 tristate 645 help 646 Enable fast lookup object identifier registry. 647 648config UCS2_STRING 649 tristate 650 651# 652# generic vdso 653# 654source "lib/vdso/Kconfig" 655 656source "lib/fonts/Kconfig" 657 658config SG_SPLIT 659 def_bool n 660 help 661 Provides a helper to split scatterlists into chunks, each chunk being 662 a scatterlist. This should be selected by a driver or an API which 663 whishes to split a scatterlist amongst multiple DMA channels. 664 665config SG_POOL 666 def_bool n 667 help 668 Provides a helper to allocate chained scatterlists. This should be 669 selected by a driver or an API which whishes to allocate chained 670 scatterlist. 671 672# 673# sg chaining option 674# 675 676config ARCH_NO_SG_CHAIN 677 def_bool n 678 679config ARCH_HAS_PMEM_API 680 bool 681 682config MEMREGION 683 bool 684 685config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION 686 bool 687 688config ARCH_HAS_MEMREMAP_COMPAT_ALIGN 689 bool 690 691# use memcpy to implement user copies for nommu architectures 692config UACCESS_MEMCPY 693 bool 694 695config ARCH_HAS_UACCESS_FLUSHCACHE 696 bool 697 698# arch has a concept of a recoverable synchronous exception due to a 699# memory-read error like x86 machine-check or ARM data-abort, and 700# implements copy_mc_to_{user,kernel} to abort and report 701# 'bytes-transferred' if that exception fires when accessing the source 702# buffer. 703config ARCH_HAS_COPY_MC 704 bool 705 706# Temporary. Goes away when all archs are cleaned up 707config ARCH_STACKWALK 708 bool 709 710config STACKDEPOT 711 bool 712 select STACKTRACE 713 help 714 Stack depot: stack trace storage that avoids duplication 715 716config STACKDEPOT_ALWAYS_INIT 717 bool 718 select STACKDEPOT 719 help 720 Always initialize stack depot during early boot 721 722config STACKDEPOT_MAX_FRAMES 723 int "Maximum number of frames in trace saved in stack depot" 724 range 1 256 725 default 64 726 depends on STACKDEPOT 727 728config REF_TRACKER 729 bool 730 depends on STACKTRACE_SUPPORT 731 select STACKDEPOT 732 733config SBITMAP 734 bool 735 736config PARMAN 737 tristate "parman" if COMPILE_TEST 738 739config OBJAGG 740 tristate "objagg" if COMPILE_TEST 741 742config LWQ_TEST 743 bool "Boot-time test for lwq queuing" 744 help 745 Run boot-time test of light-weight queuing. 746 747endmenu 748 749config GENERIC_IOREMAP 750 bool 751 752config GENERIC_LIB_ASHLDI3 753 bool 754 755config GENERIC_LIB_ASHRDI3 756 bool 757 758config GENERIC_LIB_LSHRDI3 759 bool 760 761config GENERIC_LIB_MULDI3 762 bool 763 764config GENERIC_LIB_CMPDI2 765 bool 766 767config GENERIC_LIB_UCMPDI2 768 bool 769 770config GENERIC_LIB_DEVMEM_IS_ALLOWED 771 bool 772 773config PLDMFW 774 bool 775 default n 776 777config ASN1_ENCODER 778 tristate 779 780config POLYNOMIAL 781 tristate 782 783config FIRMWARE_TABLE 784 bool 785