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 143 help 144 The CRC-CCITT library functions. Select this if your module uses any 145 of the functions from <linux/crc-ccitt.h>. 146 147config CRC16 148 tristate 149 help 150 The CRC16 library functions. Select this if your module uses any of 151 the functions from <linux/crc16.h>. 152 153config CRC_T10DIF 154 tristate 155 help 156 The CRC-T10DIF library functions. Select this if your module uses 157 any of the functions from <linux/crc-t10dif.h>. 158 159config ARCH_HAS_CRC_T10DIF 160 bool 161 162config CRC_T10DIF_ARCH 163 tristate 164 default CRC_T10DIF if ARCH_HAS_CRC_T10DIF && CRC_OPTIMIZATIONS 165 166config CRC_ITU_T 167 tristate 168 help 169 The CRC-ITU-T library functions. Select this if your module uses 170 any of the functions from <linux/crc-itu-t.h>. 171 172config CRC32 173 tristate 174 select BITREVERSE 175 help 176 The CRC32 library functions. Select this if your module uses any of 177 the functions from <linux/crc32.h> or <linux/crc32c.h>. 178 179config ARCH_HAS_CRC32 180 bool 181 182config CRC32_ARCH 183 tristate 184 default CRC32 if ARCH_HAS_CRC32 && CRC_OPTIMIZATIONS 185 186config CRC64 187 tristate 188 help 189 The CRC64 library functions. Select this if your module uses any of 190 the functions from <linux/crc64.h>. 191 192config ARCH_HAS_CRC64 193 bool 194 195config CRC64_ARCH 196 tristate 197 default CRC64 if ARCH_HAS_CRC64 && CRC_OPTIMIZATIONS 198 199config CRC4 200 tristate 201 help 202 The CRC4 library functions. Select this if your module uses any of 203 the functions from <linux/crc4.h>. 204 205config CRC7 206 tristate 207 help 208 The CRC7 library functions. Select this if your module uses any of 209 the functions from <linux/crc7.h>. 210 211config LIBCRC32C 212 tristate 213 select CRC32 214 help 215 This option just selects CRC32 and is provided for compatibility 216 purposes until the users are updated to select CRC32 directly. 217 218config CRC8 219 tristate 220 help 221 The CRC8 library functions. Select this if your module uses any of 222 the functions from <linux/crc8.h>. 223 224config CRC_OPTIMIZATIONS 225 bool "Enable optimized CRC implementations" if EXPERT 226 default y 227 help 228 Disabling this option reduces code size slightly by disabling the 229 architecture-optimized implementations of any CRC variants that are 230 enabled. CRC checksumming performance may get much slower. 231 232 Keep this enabled unless you're really trying to minimize the size of 233 the kernel. 234 235config XXHASH 236 tristate 237 238config AUDIT_GENERIC 239 bool 240 depends on AUDIT && !AUDIT_ARCH 241 default y 242 243config AUDIT_ARCH_COMPAT_GENERIC 244 bool 245 default n 246 247config AUDIT_COMPAT_GENERIC 248 bool 249 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 250 default y 251 252config RANDOM32_SELFTEST 253 bool "PRNG perform self test on init" 254 help 255 This option enables the 32 bit PRNG library functions to perform a 256 self test on initialization. 257 258# 259# compression support is select'ed if needed 260# 261config 842_COMPRESS 262 select CRC32 263 tristate 264 265config 842_DECOMPRESS 266 select CRC32 267 tristate 268 269config ZLIB_INFLATE 270 tristate 271 272config ZLIB_DEFLATE 273 tristate 274 select BITREVERSE 275 276config ZLIB_DFLTCC 277 def_bool y 278 depends on S390 279 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib" 280 help 281 Enable s390x hardware support for zlib in the kernel. 282 283config LZO_COMPRESS 284 tristate 285 286config LZO_DECOMPRESS 287 tristate 288 289config LZ4_COMPRESS 290 tristate 291 292config LZ4HC_COMPRESS 293 tristate 294 295config LZ4_DECOMPRESS 296 tristate 297 298config ZSTD_COMMON 299 select XXHASH 300 tristate 301 302config ZSTD_COMPRESS 303 select ZSTD_COMMON 304 tristate 305 306config ZSTD_DECOMPRESS 307 select ZSTD_COMMON 308 tristate 309 310source "lib/xz/Kconfig" 311 312# 313# These all provide a common interface (hence the apparent duplication with 314# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 315# 316config DECOMPRESS_GZIP 317 select ZLIB_INFLATE 318 tristate 319 320config DECOMPRESS_BZIP2 321 tristate 322 323config DECOMPRESS_LZMA 324 tristate 325 326config DECOMPRESS_XZ 327 select XZ_DEC 328 tristate 329 330config DECOMPRESS_LZO 331 select LZO_DECOMPRESS 332 tristate 333 334config DECOMPRESS_LZ4 335 select LZ4_DECOMPRESS 336 tristate 337 338config DECOMPRESS_ZSTD 339 select ZSTD_DECOMPRESS 340 tristate 341 342# 343# Generic allocator support is selected if needed 344# 345config GENERIC_ALLOCATOR 346 bool 347 348# 349# reed solomon support is select'ed if needed 350# 351config REED_SOLOMON 352 tristate 353 354config REED_SOLOMON_ENC8 355 bool 356 357config REED_SOLOMON_DEC8 358 bool 359 360config REED_SOLOMON_ENC16 361 bool 362 363config REED_SOLOMON_DEC16 364 bool 365 366# 367# BCH support is selected if needed 368# 369config BCH 370 tristate 371 select BITREVERSE 372 373config BCH_CONST_PARAMS 374 bool 375 help 376 Drivers may select this option to force specific constant 377 values for parameters 'm' (Galois field order) and 't' 378 (error correction capability). Those specific values must 379 be set by declaring default values for symbols BCH_CONST_M 380 and BCH_CONST_T. 381 Doing so will enable extra compiler optimizations, 382 improving encoding and decoding performance up to 2x for 383 usual (m,t) values (typically such that m*t < 200). 384 When this option is selected, the BCH library supports 385 only a single (m,t) configuration. This is mainly useful 386 for NAND flash board drivers requiring known, fixed BCH 387 parameters. 388 389config BCH_CONST_M 390 int 391 range 5 15 392 help 393 Constant value for Galois field order 'm'. If 'k' is the 394 number of data bits to protect, 'm' should be chosen such 395 that (k + m*t) <= 2**m - 1. 396 Drivers should declare a default value for this symbol if 397 they select option BCH_CONST_PARAMS. 398 399config BCH_CONST_T 400 int 401 help 402 Constant value for error correction capability in bits 't'. 403 Drivers should declare a default value for this symbol if 404 they select option BCH_CONST_PARAMS. 405 406# 407# Textsearch support is select'ed if needed 408# 409config TEXTSEARCH 410 bool 411 412config TEXTSEARCH_KMP 413 tristate 414 415config TEXTSEARCH_BM 416 tristate 417 418config TEXTSEARCH_FSM 419 tristate 420 421config BTREE 422 bool 423 424config INTERVAL_TREE 425 bool 426 help 427 Simple, embeddable, interval-tree. Can find the start of an 428 overlapping range in log(n) time and then iterate over all 429 overlapping nodes. The algorithm is implemented as an 430 augmented rbtree. 431 432 See: 433 434 Documentation/core-api/rbtree.rst 435 436 for more information. 437 438config INTERVAL_TREE_SPAN_ITER 439 bool 440 depends on INTERVAL_TREE 441 442config XARRAY_MULTI 443 bool 444 help 445 Support entries which occupy multiple consecutive indices in the 446 XArray. 447 448config ASSOCIATIVE_ARRAY 449 bool 450 help 451 Generic associative array. Can be searched and iterated over whilst 452 it is being modified. It is also reasonably quick to search and 453 modify. The algorithms are non-recursive, and the trees are highly 454 capacious. 455 456 See: 457 458 Documentation/core-api/assoc_array.rst 459 460 for more information. 461 462config CLOSURES 463 bool 464 465config HAS_IOMEM 466 bool 467 depends on !NO_IOMEM 468 default y 469 470config HAS_IOPORT 471 bool 472 473config HAS_IOPORT_MAP 474 bool 475 depends on HAS_IOMEM && !NO_IOPORT_MAP 476 default y 477 478source "kernel/dma/Kconfig" 479 480config SGL_ALLOC 481 bool 482 default n 483 484config IOMMU_HELPER 485 bool 486 487config CHECK_SIGNATURE 488 bool 489 490config CPUMASK_OFFSTACK 491 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 492 help 493 Use dynamic allocation for cpumask_var_t, instead of putting 494 them on the stack. This is a bit more expensive, but avoids 495 stack overflow. 496 497config FORCE_NR_CPUS 498 def_bool !SMP 499 500config CPU_RMAP 501 bool 502 depends on SMP 503 504config DQL 505 bool 506 507config GLOB 508 bool 509# This actually supports modular compilation, but the module overhead 510# is ridiculous for the amount of code involved. Until an out-of-tree 511# driver asks for it, we'll just link it directly it into the kernel 512# when required. Since we're ignoring out-of-tree users, there's also 513# no need bother prompting for a manual decision: 514# prompt "glob_match() function" 515 help 516 This option provides a glob_match function for performing 517 simple text pattern matching. It originated in the ATA code 518 to blacklist particular drive models, but other device drivers 519 may need similar functionality. 520 521 All drivers in the Linux kernel tree that require this function 522 should automatically select this option. Say N unless you 523 are compiling an out-of tree driver which tells you that it 524 depends on this. 525 526config GLOB_SELFTEST 527 tristate "glob self-test on init" 528 depends on GLOB 529 help 530 This option enables a simple self-test of the glob_match 531 function on startup. It is primarily useful for people 532 working on the code to ensure they haven't introduced any 533 regressions. 534 535 It only adds a little bit of code and slows kernel boot (or 536 module load) by a small amount, so you're welcome to play with 537 it, but you probably don't need it. 538 539# 540# Netlink attribute parsing support is select'ed if needed 541# 542config NLATTR 543 bool 544 545# 546# Generic 64-bit atomic support is selected if needed 547# 548config GENERIC_ATOMIC64 549 bool 550 551config LRU_CACHE 552 tristate 553 554config CLZ_TAB 555 bool 556 557config IRQ_POLL 558 bool "IRQ polling library" 559 help 560 Helper library to poll interrupt mitigation using polling. 561 562config MPILIB 563 tristate 564 select CLZ_TAB 565 help 566 Multiprecision maths library from GnuPG. 567 It is used to implement RSA digital signature verification, 568 which is used by IMA/EVM digital signature extension. 569 570config SIGNATURE 571 tristate 572 depends on KEYS 573 select CRYPTO 574 select CRYPTO_SHA1 575 select MPILIB 576 help 577 Digital signature verification. Currently only RSA is supported. 578 Implementation is done using GnuPG MPI library 579 580config DIMLIB 581 tristate 582 depends on NET 583 help 584 Dynamic Interrupt Moderation library. 585 Implements an algorithm for dynamically changing CQ moderation values 586 according to run time performance. 587 588# 589# libfdt files, only selected if needed. 590# 591config LIBFDT 592 bool 593 594config OID_REGISTRY 595 tristate 596 help 597 Enable fast lookup object identifier registry. 598 599config UCS2_STRING 600 tristate 601 602# 603# generic vdso 604# 605source "lib/vdso/Kconfig" 606 607source "lib/fonts/Kconfig" 608 609config SG_SPLIT 610 def_bool n 611 help 612 Provides a helper to split scatterlists into chunks, each chunk being 613 a scatterlist. This should be selected by a driver or an API which 614 whishes to split a scatterlist amongst multiple DMA channels. 615 616config SG_POOL 617 def_bool n 618 help 619 Provides a helper to allocate chained scatterlists. This should be 620 selected by a driver or an API which whishes to allocate chained 621 scatterlist. 622 623# 624# sg chaining option 625# 626 627config ARCH_NO_SG_CHAIN 628 def_bool n 629 630config ARCH_HAS_PMEM_API 631 bool 632 633config MEMREGION 634 bool 635 636config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION 637 bool 638 639config ARCH_HAS_MEMREMAP_COMPAT_ALIGN 640 bool 641 642# use memcpy to implement user copies for nommu architectures 643config UACCESS_MEMCPY 644 bool 645 646config ARCH_HAS_UACCESS_FLUSHCACHE 647 bool 648 649# arch has a concept of a recoverable synchronous exception due to a 650# memory-read error like x86 machine-check or ARM data-abort, and 651# implements copy_mc_to_{user,kernel} to abort and report 652# 'bytes-transferred' if that exception fires when accessing the source 653# buffer. 654config ARCH_HAS_COPY_MC 655 bool 656 657# Temporary. Goes away when all archs are cleaned up 658config ARCH_STACKWALK 659 bool 660 661config STACKDEPOT 662 bool 663 select STACKTRACE 664 help 665 Stack depot: stack trace storage that avoids duplication 666 667config STACKDEPOT_ALWAYS_INIT 668 bool 669 select STACKDEPOT 670 help 671 Always initialize stack depot during early boot 672 673config STACKDEPOT_MAX_FRAMES 674 int "Maximum number of frames in trace saved in stack depot" 675 range 1 256 676 default 64 677 depends on STACKDEPOT 678 679config REF_TRACKER 680 bool 681 depends on STACKTRACE_SUPPORT 682 select STACKDEPOT 683 684config SBITMAP 685 bool 686 687config PARMAN 688 tristate "parman" if COMPILE_TEST 689 690config OBJAGG 691 tristate "objagg" if COMPILE_TEST 692 693config LWQ_TEST 694 bool "Boot-time test for lwq queuing" 695 help 696 Run boot-time test of light-weight queuing. 697 698endmenu 699 700config GENERIC_IOREMAP 701 bool 702 703config GENERIC_LIB_ASHLDI3 704 bool 705 706config GENERIC_LIB_ASHRDI3 707 bool 708 709config GENERIC_LIB_LSHRDI3 710 bool 711 712config GENERIC_LIB_MULDI3 713 bool 714 715config GENERIC_LIB_CMPDI2 716 bool 717 718config GENERIC_LIB_UCMPDI2 719 bool 720 721config GENERIC_LIB_DEVMEM_IS_ALLOWED 722 bool 723 724config PLDMFW 725 bool 726 default n 727 728config ASN1_ENCODER 729 tristate 730 731config POLYNOMIAL 732 tristate 733 734config FIRMWARE_TABLE 735 bool 736 737config UNION_FIND 738 bool 739 740config MIN_HEAP 741 bool 742