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 CRC_ITU_T 172 tristate "CRC ITU-T V.41 functions" 173 help 174 This option is provided for the case where no in-kernel-tree 175 modules require CRC ITU-T V.41 functions, but a module built outside 176 the kernel tree does. Such modules that use library CRC ITU-T V.41 177 functions require M here. 178 179config CRC32 180 tristate "CRC32/CRC32c functions" 181 default y 182 select BITREVERSE 183 help 184 This option is provided for the case where no in-kernel-tree 185 modules require CRC32/CRC32c functions, but a module built outside 186 the kernel tree does. Such modules that use library CRC32/CRC32c 187 functions require M here. 188 189config ARCH_HAS_CRC32 190 bool 191 192config CRC32_ARCH 193 tristate 194 default CRC32 if ARCH_HAS_CRC32 && CRC_OPTIMIZATIONS 195 196config CRC64 197 tristate "CRC64 functions" 198 help 199 This option is provided for the case where no in-kernel-tree 200 modules require CRC64 functions, but a module built outside 201 the kernel tree does. Such modules that use library CRC64 202 functions require M here. 203 204config ARCH_HAS_CRC64 205 bool 206 207config CRC64_ARCH 208 tristate 209 default CRC64 if ARCH_HAS_CRC64 && CRC_OPTIMIZATIONS 210 211config CRC4 212 tristate "CRC4 functions" 213 help 214 This option is provided for the case where no in-kernel-tree 215 modules require CRC4 functions, but a module built outside 216 the kernel tree does. Such modules that use library CRC4 217 functions require M here. 218 219config CRC7 220 tristate "CRC7 functions" 221 help 222 This option is provided for the case where no in-kernel-tree 223 modules require CRC7 functions, but a module built outside 224 the kernel tree does. Such modules that use library CRC7 225 functions require M here. 226 227config LIBCRC32C 228 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 229 select CRC32 230 help 231 This option just selects CRC32 and is provided for compatibility 232 purposes until the users are updated to select CRC32 directly. 233 234config CRC8 235 tristate "CRC8 function" 236 help 237 This option provides CRC8 function. Drivers may select this 238 when they need to do cyclic redundancy check according CRC8 239 algorithm. Module will be called crc8. 240 241config CRC_OPTIMIZATIONS 242 bool "Enable optimized CRC implementations" if EXPERT 243 default y 244 help 245 Disabling this option reduces code size slightly by disabling the 246 architecture-optimized implementations of any CRC variants that are 247 enabled. CRC checksumming performance may get much slower. 248 249 Keep this enabled unless you're really trying to minimize the size of 250 the kernel. 251 252config XXHASH 253 tristate 254 255config AUDIT_GENERIC 256 bool 257 depends on AUDIT && !AUDIT_ARCH 258 default y 259 260config AUDIT_ARCH_COMPAT_GENERIC 261 bool 262 default n 263 264config AUDIT_COMPAT_GENERIC 265 bool 266 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 267 default y 268 269config RANDOM32_SELFTEST 270 bool "PRNG perform self test on init" 271 help 272 This option enables the 32 bit PRNG library functions to perform a 273 self test on initialization. 274 275# 276# compression support is select'ed if needed 277# 278config 842_COMPRESS 279 select CRC32 280 tristate 281 282config 842_DECOMPRESS 283 select CRC32 284 tristate 285 286config ZLIB_INFLATE 287 tristate 288 289config ZLIB_DEFLATE 290 tristate 291 select BITREVERSE 292 293config ZLIB_DFLTCC 294 def_bool y 295 depends on S390 296 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib" 297 help 298 Enable s390x hardware support for zlib in the kernel. 299 300config LZO_COMPRESS 301 tristate 302 303config LZO_DECOMPRESS 304 tristate 305 306config LZ4_COMPRESS 307 tristate 308 309config LZ4HC_COMPRESS 310 tristate 311 312config LZ4_DECOMPRESS 313 tristate 314 315config ZSTD_COMMON 316 select XXHASH 317 tristate 318 319config ZSTD_COMPRESS 320 select ZSTD_COMMON 321 tristate 322 323config ZSTD_DECOMPRESS 324 select ZSTD_COMMON 325 tristate 326 327source "lib/xz/Kconfig" 328 329# 330# These all provide a common interface (hence the apparent duplication with 331# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 332# 333config DECOMPRESS_GZIP 334 select ZLIB_INFLATE 335 tristate 336 337config DECOMPRESS_BZIP2 338 tristate 339 340config DECOMPRESS_LZMA 341 tristate 342 343config DECOMPRESS_XZ 344 select XZ_DEC 345 tristate 346 347config DECOMPRESS_LZO 348 select LZO_DECOMPRESS 349 tristate 350 351config DECOMPRESS_LZ4 352 select LZ4_DECOMPRESS 353 tristate 354 355config DECOMPRESS_ZSTD 356 select ZSTD_DECOMPRESS 357 tristate 358 359# 360# Generic allocator support is selected if needed 361# 362config GENERIC_ALLOCATOR 363 bool 364 365# 366# reed solomon support is select'ed if needed 367# 368config REED_SOLOMON 369 tristate 370 371config REED_SOLOMON_ENC8 372 bool 373 374config REED_SOLOMON_DEC8 375 bool 376 377config REED_SOLOMON_ENC16 378 bool 379 380config REED_SOLOMON_DEC16 381 bool 382 383# 384# BCH support is selected if needed 385# 386config BCH 387 tristate 388 select BITREVERSE 389 390config BCH_CONST_PARAMS 391 bool 392 help 393 Drivers may select this option to force specific constant 394 values for parameters 'm' (Galois field order) and 't' 395 (error correction capability). Those specific values must 396 be set by declaring default values for symbols BCH_CONST_M 397 and BCH_CONST_T. 398 Doing so will enable extra compiler optimizations, 399 improving encoding and decoding performance up to 2x for 400 usual (m,t) values (typically such that m*t < 200). 401 When this option is selected, the BCH library supports 402 only a single (m,t) configuration. This is mainly useful 403 for NAND flash board drivers requiring known, fixed BCH 404 parameters. 405 406config BCH_CONST_M 407 int 408 range 5 15 409 help 410 Constant value for Galois field order 'm'. If 'k' is the 411 number of data bits to protect, 'm' should be chosen such 412 that (k + m*t) <= 2**m - 1. 413 Drivers should declare a default value for this symbol if 414 they select option BCH_CONST_PARAMS. 415 416config BCH_CONST_T 417 int 418 help 419 Constant value for error correction capability in bits 't'. 420 Drivers should declare a default value for this symbol if 421 they select option BCH_CONST_PARAMS. 422 423# 424# Textsearch support is select'ed if needed 425# 426config TEXTSEARCH 427 bool 428 429config TEXTSEARCH_KMP 430 tristate 431 432config TEXTSEARCH_BM 433 tristate 434 435config TEXTSEARCH_FSM 436 tristate 437 438config BTREE 439 bool 440 441config INTERVAL_TREE 442 bool 443 help 444 Simple, embeddable, interval-tree. Can find the start of an 445 overlapping range in log(n) time and then iterate over all 446 overlapping nodes. The algorithm is implemented as an 447 augmented rbtree. 448 449 See: 450 451 Documentation/core-api/rbtree.rst 452 453 for more information. 454 455config INTERVAL_TREE_SPAN_ITER 456 bool 457 depends on INTERVAL_TREE 458 459config XARRAY_MULTI 460 bool 461 help 462 Support entries which occupy multiple consecutive indices in the 463 XArray. 464 465config ASSOCIATIVE_ARRAY 466 bool 467 help 468 Generic associative array. Can be searched and iterated over whilst 469 it is being modified. It is also reasonably quick to search and 470 modify. The algorithms are non-recursive, and the trees are highly 471 capacious. 472 473 See: 474 475 Documentation/core-api/assoc_array.rst 476 477 for more information. 478 479config CLOSURES 480 bool 481 482config HAS_IOMEM 483 bool 484 depends on !NO_IOMEM 485 default y 486 487config HAS_IOPORT 488 bool 489 490config HAS_IOPORT_MAP 491 bool 492 depends on HAS_IOMEM && !NO_IOPORT_MAP 493 default y 494 495source "kernel/dma/Kconfig" 496 497config SGL_ALLOC 498 bool 499 default n 500 501config IOMMU_HELPER 502 bool 503 504config CHECK_SIGNATURE 505 bool 506 507config CPUMASK_OFFSTACK 508 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 509 help 510 Use dynamic allocation for cpumask_var_t, instead of putting 511 them on the stack. This is a bit more expensive, but avoids 512 stack overflow. 513 514config FORCE_NR_CPUS 515 def_bool !SMP 516 517config CPU_RMAP 518 bool 519 depends on SMP 520 521config DQL 522 bool 523 524config GLOB 525 bool 526# This actually supports modular compilation, but the module overhead 527# is ridiculous for the amount of code involved. Until an out-of-tree 528# driver asks for it, we'll just link it directly it into the kernel 529# when required. Since we're ignoring out-of-tree users, there's also 530# no need bother prompting for a manual decision: 531# prompt "glob_match() function" 532 help 533 This option provides a glob_match function for performing 534 simple text pattern matching. It originated in the ATA code 535 to blacklist particular drive models, but other device drivers 536 may need similar functionality. 537 538 All drivers in the Linux kernel tree that require this function 539 should automatically select this option. Say N unless you 540 are compiling an out-of tree driver which tells you that it 541 depends on this. 542 543config GLOB_SELFTEST 544 tristate "glob self-test on init" 545 depends on GLOB 546 help 547 This option enables a simple self-test of the glob_match 548 function on startup. It is primarily useful for people 549 working on the code to ensure they haven't introduced any 550 regressions. 551 552 It only adds a little bit of code and slows kernel boot (or 553 module load) by a small amount, so you're welcome to play with 554 it, but you probably don't need it. 555 556# 557# Netlink attribute parsing support is select'ed if needed 558# 559config NLATTR 560 bool 561 562# 563# Generic 64-bit atomic support is selected if needed 564# 565config GENERIC_ATOMIC64 566 bool 567 568config LRU_CACHE 569 tristate 570 571config CLZ_TAB 572 bool 573 574config IRQ_POLL 575 bool "IRQ polling library" 576 help 577 Helper library to poll interrupt mitigation using polling. 578 579config MPILIB 580 tristate 581 select CLZ_TAB 582 help 583 Multiprecision maths library from GnuPG. 584 It is used to implement RSA digital signature verification, 585 which is used by IMA/EVM digital signature extension. 586 587config SIGNATURE 588 tristate 589 depends on KEYS 590 select CRYPTO 591 select CRYPTO_SHA1 592 select MPILIB 593 help 594 Digital signature verification. Currently only RSA is supported. 595 Implementation is done using GnuPG MPI library 596 597config DIMLIB 598 tristate 599 depends on NET 600 help 601 Dynamic Interrupt Moderation library. 602 Implements an algorithm for dynamically changing CQ moderation values 603 according to run time performance. 604 605# 606# libfdt files, only selected if needed. 607# 608config LIBFDT 609 bool 610 611config OID_REGISTRY 612 tristate 613 help 614 Enable fast lookup object identifier registry. 615 616config UCS2_STRING 617 tristate 618 619# 620# generic vdso 621# 622source "lib/vdso/Kconfig" 623 624source "lib/fonts/Kconfig" 625 626config SG_SPLIT 627 def_bool n 628 help 629 Provides a helper to split scatterlists into chunks, each chunk being 630 a scatterlist. This should be selected by a driver or an API which 631 whishes to split a scatterlist amongst multiple DMA channels. 632 633config SG_POOL 634 def_bool n 635 help 636 Provides a helper to allocate chained scatterlists. This should be 637 selected by a driver or an API which whishes to allocate chained 638 scatterlist. 639 640# 641# sg chaining option 642# 643 644config ARCH_NO_SG_CHAIN 645 def_bool n 646 647config ARCH_HAS_PMEM_API 648 bool 649 650config MEMREGION 651 bool 652 653config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION 654 bool 655 656config ARCH_HAS_MEMREMAP_COMPAT_ALIGN 657 bool 658 659# use memcpy to implement user copies for nommu architectures 660config UACCESS_MEMCPY 661 bool 662 663config ARCH_HAS_UACCESS_FLUSHCACHE 664 bool 665 666# arch has a concept of a recoverable synchronous exception due to a 667# memory-read error like x86 machine-check or ARM data-abort, and 668# implements copy_mc_to_{user,kernel} to abort and report 669# 'bytes-transferred' if that exception fires when accessing the source 670# buffer. 671config ARCH_HAS_COPY_MC 672 bool 673 674# Temporary. Goes away when all archs are cleaned up 675config ARCH_STACKWALK 676 bool 677 678config STACKDEPOT 679 bool 680 select STACKTRACE 681 help 682 Stack depot: stack trace storage that avoids duplication 683 684config STACKDEPOT_ALWAYS_INIT 685 bool 686 select STACKDEPOT 687 help 688 Always initialize stack depot during early boot 689 690config STACKDEPOT_MAX_FRAMES 691 int "Maximum number of frames in trace saved in stack depot" 692 range 1 256 693 default 64 694 depends on STACKDEPOT 695 696config REF_TRACKER 697 bool 698 depends on STACKTRACE_SUPPORT 699 select STACKDEPOT 700 701config SBITMAP 702 bool 703 704config PARMAN 705 tristate "parman" if COMPILE_TEST 706 707config OBJAGG 708 tristate "objagg" if COMPILE_TEST 709 710config LWQ_TEST 711 bool "Boot-time test for lwq queuing" 712 help 713 Run boot-time test of light-weight queuing. 714 715endmenu 716 717config GENERIC_IOREMAP 718 bool 719 720config GENERIC_LIB_ASHLDI3 721 bool 722 723config GENERIC_LIB_ASHRDI3 724 bool 725 726config GENERIC_LIB_LSHRDI3 727 bool 728 729config GENERIC_LIB_MULDI3 730 bool 731 732config GENERIC_LIB_CMPDI2 733 bool 734 735config GENERIC_LIB_UCMPDI2 736 bool 737 738config GENERIC_LIB_DEVMEM_IS_ALLOWED 739 bool 740 741config PLDMFW 742 bool 743 default n 744 745config ASN1_ENCODER 746 tristate 747 748config POLYNOMIAL 749 tristate 750 751config FIRMWARE_TABLE 752 bool 753 754config UNION_FIND 755 bool 756 757config MIN_HEAP 758 bool 759