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 PACKING_KUNIT_TEST 44 tristate "KUnit tests for packing library" if !KUNIT_ALL_TESTS 45 depends on PACKING && KUNIT 46 default KUNIT_ALL_TESTS 47 help 48 This builds KUnit tests for the packing library. 49 50 For more information on KUnit and unit tests in general, 51 please refer to the KUnit documentation in Documentation/dev-tools/kunit/. 52 53 When in doubt, say N. 54 55config BITREVERSE 56 tristate 57 58config HAVE_ARCH_BITREVERSE 59 bool 60 default n 61 help 62 This option enables the use of hardware bit-reversal instructions on 63 architectures which support such operations. 64 65config ARCH_HAS_STRNCPY_FROM_USER 66 bool 67 68config ARCH_HAS_STRNLEN_USER 69 bool 70 71config GENERIC_STRNCPY_FROM_USER 72 def_bool !ARCH_HAS_STRNCPY_FROM_USER 73 74config GENERIC_STRNLEN_USER 75 def_bool !ARCH_HAS_STRNLEN_USER 76 77config GENERIC_NET_UTILS 78 bool 79 80source "lib/math/Kconfig" 81 82config NO_GENERIC_PCI_IOPORT_MAP 83 bool 84 85config GENERIC_IOMAP 86 bool 87 select GENERIC_PCI_IOMAP 88 89config STMP_DEVICE 90 bool 91 92config ARCH_USE_CMPXCHG_LOCKREF 93 bool 94 95config ARCH_HAS_FAST_MULTIPLIER 96 bool 97 98config ARCH_USE_SYM_ANNOTATIONS 99 bool 100 101config INDIRECT_PIO 102 bool "Access I/O in non-MMIO mode" 103 depends on ARM64 104 depends on HAS_IOPORT 105 help 106 On some platforms where no separate I/O space exists, there are I/O 107 hosts which can not be accessed in MMIO mode. Using the logical PIO 108 mechanism, the host-local I/O resource can be mapped into system 109 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the 110 system can access the I/O devices with the mapped-logic PIO through 111 I/O accessors. 112 113 This way has relatively little I/O performance cost. Please make 114 sure your devices really need this configure item enabled. 115 116 When in doubt, say N. 117 118config INDIRECT_IOMEM 119 bool 120 help 121 This is selected by other options/architectures to provide the 122 emulated iomem accessors. 123 124config INDIRECT_IOMEM_FALLBACK 125 bool 126 depends on INDIRECT_IOMEM 127 help 128 If INDIRECT_IOMEM is selected, this enables falling back to plain 129 mmio accesses when the IO memory address is not a registered 130 emulated region. 131 132config TRACE_MMIO_ACCESS 133 bool "Register read/write tracing" 134 depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS 135 help 136 Create tracepoints for MMIO read/write operations. These trace events 137 can be used for logging all MMIO read/write operations. 138 139source "lib/crypto/Kconfig" 140 141config CRC_CCITT 142 tristate "CRC-CCITT functions" 143 help 144 This option is provided for the case where no in-kernel-tree 145 modules require CRC-CCITT functions, but a module built outside 146 the kernel tree does. Such modules that use library CRC-CCITT 147 functions require M here. 148 149config CRC16 150 tristate "CRC16 functions" 151 help 152 This option is provided for the case where no in-kernel-tree 153 modules require CRC16 functions, but a module built outside 154 the kernel tree does. Such modules that use library CRC16 155 functions require M here. 156 157config CRC_T10DIF 158 tristate "CRC calculation for the T10 Data Integrity Field" 159 help 160 This option is only needed if a module that's not in the 161 kernel tree needs to calculate CRC checks for use with the 162 SCSI data integrity subsystem. 163 164config ARCH_HAS_CRC_T10DIF 165 bool 166 167config CRC_T10DIF_ARCH 168 tristate 169 default CRC_T10DIF if ARCH_HAS_CRC_T10DIF && CRC_OPTIMIZATIONS 170 171config CRC64_ROCKSOFT 172 tristate "CRC calculation for the Rocksoft model CRC64" 173 select CRC64 174 select CRYPTO 175 select CRYPTO_CRC64_ROCKSOFT 176 help 177 This option provides a CRC64 API to a registered crypto driver. 178 This is used with the block layer's data integrity subsystem. 179 180config CRC_ITU_T 181 tristate "CRC ITU-T V.41 functions" 182 help 183 This option is provided for the case where no in-kernel-tree 184 modules require CRC ITU-T V.41 functions, but a module built outside 185 the kernel tree does. Such modules that use library CRC ITU-T V.41 186 functions require M here. 187 188config CRC32 189 tristate "CRC32/CRC32c functions" 190 default y 191 select BITREVERSE 192 help 193 This option is provided for the case where no in-kernel-tree 194 modules require CRC32/CRC32c functions, but a module built outside 195 the kernel tree does. Such modules that use library CRC32/CRC32c 196 functions require M here. 197 198config ARCH_HAS_CRC32 199 bool 200 201config CRC32_ARCH 202 tristate 203 default CRC32 if ARCH_HAS_CRC32 && CRC_OPTIMIZATIONS 204 205config CRC64 206 tristate "CRC64 functions" 207 help 208 This option is provided for the case where no in-kernel-tree 209 modules require CRC64 functions, but a module built outside 210 the kernel tree does. Such modules that use library CRC64 211 functions require M here. 212 213config CRC4 214 tristate "CRC4 functions" 215 help 216 This option is provided for the case where no in-kernel-tree 217 modules require CRC4 functions, but a module built outside 218 the kernel tree does. Such modules that use library CRC4 219 functions require M here. 220 221config CRC7 222 tristate "CRC7 functions" 223 help 224 This option is provided for the case where no in-kernel-tree 225 modules require CRC7 functions, but a module built outside 226 the kernel tree does. Such modules that use library CRC7 227 functions require M here. 228 229config LIBCRC32C 230 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 231 select CRC32 232 help 233 This option just selects CRC32 and is provided for compatibility 234 purposes until the users are updated to select CRC32 directly. 235 236config CRC8 237 tristate "CRC8 function" 238 help 239 This option provides CRC8 function. Drivers may select this 240 when they need to do cyclic redundancy check according CRC8 241 algorithm. Module will be called crc8. 242 243config CRC_OPTIMIZATIONS 244 bool "Enable optimized CRC implementations" if EXPERT 245 default y 246 help 247 Disabling this option reduces code size slightly by disabling the 248 architecture-optimized implementations of any CRC variants that are 249 enabled. CRC checksumming performance may get much slower. 250 251 Keep this enabled unless you're really trying to minimize the size of 252 the kernel. 253 254config XXHASH 255 tristate 256 257config AUDIT_GENERIC 258 bool 259 depends on AUDIT && !AUDIT_ARCH 260 default y 261 262config AUDIT_ARCH_COMPAT_GENERIC 263 bool 264 default n 265 266config AUDIT_COMPAT_GENERIC 267 bool 268 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 269 default y 270 271config RANDOM32_SELFTEST 272 bool "PRNG perform self test on init" 273 help 274 This option enables the 32 bit PRNG library functions to perform a 275 self test on initialization. 276 277# 278# compression support is select'ed if needed 279# 280config 842_COMPRESS 281 select CRC32 282 tristate 283 284config 842_DECOMPRESS 285 select CRC32 286 tristate 287 288config ZLIB_INFLATE 289 tristate 290 291config ZLIB_DEFLATE 292 tristate 293 select BITREVERSE 294 295config ZLIB_DFLTCC 296 def_bool y 297 depends on S390 298 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib" 299 help 300 Enable s390x hardware support for zlib in the kernel. 301 302config LZO_COMPRESS 303 tristate 304 305config LZO_DECOMPRESS 306 tristate 307 308config LZ4_COMPRESS 309 tristate 310 311config LZ4HC_COMPRESS 312 tristate 313 314config LZ4_DECOMPRESS 315 tristate 316 317config ZSTD_COMMON 318 select XXHASH 319 tristate 320 321config ZSTD_COMPRESS 322 select ZSTD_COMMON 323 tristate 324 325config ZSTD_DECOMPRESS 326 select ZSTD_COMMON 327 tristate 328 329source "lib/xz/Kconfig" 330 331# 332# These all provide a common interface (hence the apparent duplication with 333# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 334# 335config DECOMPRESS_GZIP 336 select ZLIB_INFLATE 337 tristate 338 339config DECOMPRESS_BZIP2 340 tristate 341 342config DECOMPRESS_LZMA 343 tristate 344 345config DECOMPRESS_XZ 346 select XZ_DEC 347 tristate 348 349config DECOMPRESS_LZO 350 select LZO_DECOMPRESS 351 tristate 352 353config DECOMPRESS_LZ4 354 select LZ4_DECOMPRESS 355 tristate 356 357config DECOMPRESS_ZSTD 358 select ZSTD_DECOMPRESS 359 tristate 360 361# 362# Generic allocator support is selected if needed 363# 364config GENERIC_ALLOCATOR 365 bool 366 367# 368# reed solomon support is select'ed if needed 369# 370config REED_SOLOMON 371 tristate 372 373config REED_SOLOMON_ENC8 374 bool 375 376config REED_SOLOMON_DEC8 377 bool 378 379config REED_SOLOMON_ENC16 380 bool 381 382config REED_SOLOMON_DEC16 383 bool 384 385# 386# BCH support is selected if needed 387# 388config BCH 389 tristate 390 select BITREVERSE 391 392config BCH_CONST_PARAMS 393 bool 394 help 395 Drivers may select this option to force specific constant 396 values for parameters 'm' (Galois field order) and 't' 397 (error correction capability). Those specific values must 398 be set by declaring default values for symbols BCH_CONST_M 399 and BCH_CONST_T. 400 Doing so will enable extra compiler optimizations, 401 improving encoding and decoding performance up to 2x for 402 usual (m,t) values (typically such that m*t < 200). 403 When this option is selected, the BCH library supports 404 only a single (m,t) configuration. This is mainly useful 405 for NAND flash board drivers requiring known, fixed BCH 406 parameters. 407 408config BCH_CONST_M 409 int 410 range 5 15 411 help 412 Constant value for Galois field order 'm'. If 'k' is the 413 number of data bits to protect, 'm' should be chosen such 414 that (k + m*t) <= 2**m - 1. 415 Drivers should declare a default value for this symbol if 416 they select option BCH_CONST_PARAMS. 417 418config BCH_CONST_T 419 int 420 help 421 Constant value for error correction capability in bits 't'. 422 Drivers should declare a default value for this symbol if 423 they select option BCH_CONST_PARAMS. 424 425# 426# Textsearch support is select'ed if needed 427# 428config TEXTSEARCH 429 bool 430 431config TEXTSEARCH_KMP 432 tristate 433 434config TEXTSEARCH_BM 435 tristate 436 437config TEXTSEARCH_FSM 438 tristate 439 440config BTREE 441 bool 442 443config INTERVAL_TREE 444 bool 445 help 446 Simple, embeddable, interval-tree. Can find the start of an 447 overlapping range in log(n) time and then iterate over all 448 overlapping nodes. The algorithm is implemented as an 449 augmented rbtree. 450 451 See: 452 453 Documentation/core-api/rbtree.rst 454 455 for more information. 456 457config INTERVAL_TREE_SPAN_ITER 458 bool 459 depends on INTERVAL_TREE 460 461config XARRAY_MULTI 462 bool 463 help 464 Support entries which occupy multiple consecutive indices in the 465 XArray. 466 467config ASSOCIATIVE_ARRAY 468 bool 469 help 470 Generic associative array. Can be searched and iterated over whilst 471 it is being modified. It is also reasonably quick to search and 472 modify. The algorithms are non-recursive, and the trees are highly 473 capacious. 474 475 See: 476 477 Documentation/core-api/assoc_array.rst 478 479 for more information. 480 481config CLOSURES 482 bool 483 484config HAS_IOMEM 485 bool 486 depends on !NO_IOMEM 487 default y 488 489config HAS_IOPORT 490 bool 491 492config HAS_IOPORT_MAP 493 bool 494 depends on HAS_IOMEM && !NO_IOPORT_MAP 495 default y 496 497source "kernel/dma/Kconfig" 498 499config SGL_ALLOC 500 bool 501 default n 502 503config IOMMU_HELPER 504 bool 505 506config CHECK_SIGNATURE 507 bool 508 509config CPUMASK_OFFSTACK 510 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 511 help 512 Use dynamic allocation for cpumask_var_t, instead of putting 513 them on the stack. This is a bit more expensive, but avoids 514 stack overflow. 515 516config FORCE_NR_CPUS 517 def_bool !SMP 518 519config CPU_RMAP 520 bool 521 depends on SMP 522 523config DQL 524 bool 525 526config GLOB 527 bool 528# This actually supports modular compilation, but the module overhead 529# is ridiculous for the amount of code involved. Until an out-of-tree 530# driver asks for it, we'll just link it directly it into the kernel 531# when required. Since we're ignoring out-of-tree users, there's also 532# no need bother prompting for a manual decision: 533# prompt "glob_match() function" 534 help 535 This option provides a glob_match function for performing 536 simple text pattern matching. It originated in the ATA code 537 to blacklist particular drive models, but other device drivers 538 may need similar functionality. 539 540 All drivers in the Linux kernel tree that require this function 541 should automatically select this option. Say N unless you 542 are compiling an out-of tree driver which tells you that it 543 depends on this. 544 545config GLOB_SELFTEST 546 tristate "glob self-test on init" 547 depends on GLOB 548 help 549 This option enables a simple self-test of the glob_match 550 function on startup. It is primarily useful for people 551 working on the code to ensure they haven't introduced any 552 regressions. 553 554 It only adds a little bit of code and slows kernel boot (or 555 module load) by a small amount, so you're welcome to play with 556 it, but you probably don't need it. 557 558# 559# Netlink attribute parsing support is select'ed if needed 560# 561config NLATTR 562 bool 563 564# 565# Generic 64-bit atomic support is selected if needed 566# 567config GENERIC_ATOMIC64 568 bool 569 570config LRU_CACHE 571 tristate 572 573config CLZ_TAB 574 bool 575 576config IRQ_POLL 577 bool "IRQ polling library" 578 help 579 Helper library to poll interrupt mitigation using polling. 580 581config MPILIB 582 tristate 583 select CLZ_TAB 584 help 585 Multiprecision maths library from GnuPG. 586 It is used to implement RSA digital signature verification, 587 which is used by IMA/EVM digital signature extension. 588 589config SIGNATURE 590 tristate 591 depends on KEYS 592 select CRYPTO 593 select CRYPTO_SHA1 594 select MPILIB 595 help 596 Digital signature verification. Currently only RSA is supported. 597 Implementation is done using GnuPG MPI library 598 599config DIMLIB 600 tristate 601 depends on NET 602 help 603 Dynamic Interrupt Moderation library. 604 Implements an algorithm for dynamically changing CQ moderation values 605 according to run time performance. 606 607# 608# libfdt files, only selected if needed. 609# 610config LIBFDT 611 bool 612 613config OID_REGISTRY 614 tristate 615 help 616 Enable fast lookup object identifier registry. 617 618config UCS2_STRING 619 tristate 620 621# 622# generic vdso 623# 624source "lib/vdso/Kconfig" 625 626source "lib/fonts/Kconfig" 627 628config SG_SPLIT 629 def_bool n 630 help 631 Provides a helper to split scatterlists into chunks, each chunk being 632 a scatterlist. This should be selected by a driver or an API which 633 whishes to split a scatterlist amongst multiple DMA channels. 634 635config SG_POOL 636 def_bool n 637 help 638 Provides a helper to allocate chained scatterlists. This should be 639 selected by a driver or an API which whishes to allocate chained 640 scatterlist. 641 642# 643# sg chaining option 644# 645 646config ARCH_NO_SG_CHAIN 647 def_bool n 648 649config ARCH_HAS_PMEM_API 650 bool 651 652config MEMREGION 653 bool 654 655config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION 656 bool 657 658config ARCH_HAS_MEMREMAP_COMPAT_ALIGN 659 bool 660 661# use memcpy to implement user copies for nommu architectures 662config UACCESS_MEMCPY 663 bool 664 665config ARCH_HAS_UACCESS_FLUSHCACHE 666 bool 667 668# arch has a concept of a recoverable synchronous exception due to a 669# memory-read error like x86 machine-check or ARM data-abort, and 670# implements copy_mc_to_{user,kernel} to abort and report 671# 'bytes-transferred' if that exception fires when accessing the source 672# buffer. 673config ARCH_HAS_COPY_MC 674 bool 675 676# Temporary. Goes away when all archs are cleaned up 677config ARCH_STACKWALK 678 bool 679 680config STACKDEPOT 681 bool 682 select STACKTRACE 683 help 684 Stack depot: stack trace storage that avoids duplication 685 686config STACKDEPOT_ALWAYS_INIT 687 bool 688 select STACKDEPOT 689 help 690 Always initialize stack depot during early boot 691 692config STACKDEPOT_MAX_FRAMES 693 int "Maximum number of frames in trace saved in stack depot" 694 range 1 256 695 default 64 696 depends on STACKDEPOT 697 698config REF_TRACKER 699 bool 700 depends on STACKTRACE_SUPPORT 701 select STACKDEPOT 702 703config SBITMAP 704 bool 705 706config PARMAN 707 tristate "parman" if COMPILE_TEST 708 709config OBJAGG 710 tristate "objagg" if COMPILE_TEST 711 712config LWQ_TEST 713 bool "Boot-time test for lwq queuing" 714 help 715 Run boot-time test of light-weight queuing. 716 717endmenu 718 719config GENERIC_IOREMAP 720 bool 721 722config GENERIC_LIB_ASHLDI3 723 bool 724 725config GENERIC_LIB_ASHRDI3 726 bool 727 728config GENERIC_LIB_LSHRDI3 729 bool 730 731config GENERIC_LIB_MULDI3 732 bool 733 734config GENERIC_LIB_CMPDI2 735 bool 736 737config GENERIC_LIB_UCMPDI2 738 bool 739 740config GENERIC_LIB_DEVMEM_IS_ALLOWED 741 bool 742 743config PLDMFW 744 bool 745 default n 746 747config ASN1_ENCODER 748 tristate 749 750config POLYNOMIAL 751 tristate 752 753config FIRMWARE_TABLE 754 bool 755 756config UNION_FIND 757 bool 758 759config MIN_HEAP 760 bool 761