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 144config CRC16 145 tristate 146 147config CRC_T10DIF 148 tristate 149 150config ARCH_HAS_CRC_T10DIF 151 bool 152 153config CRC_T10DIF_ARCH 154 tristate 155 default CRC_T10DIF if ARCH_HAS_CRC_T10DIF && CRC_OPTIMIZATIONS 156 157config CRC_ITU_T 158 tristate "CRC ITU-T V.41 functions" 159 help 160 This option is provided for the case where no in-kernel-tree 161 modules require CRC ITU-T V.41 functions, but a module built outside 162 the kernel tree does. Such modules that use library CRC ITU-T V.41 163 functions require M here. 164 165config CRC32 166 tristate 167 select BITREVERSE 168 169config ARCH_HAS_CRC32 170 bool 171 172config CRC32_ARCH 173 tristate 174 default CRC32 if ARCH_HAS_CRC32 && CRC_OPTIMIZATIONS 175 176config CRC64 177 tristate 178 179config ARCH_HAS_CRC64 180 bool 181 182config CRC64_ARCH 183 tristate 184 default CRC64 if ARCH_HAS_CRC64 && CRC_OPTIMIZATIONS 185 186config CRC4 187 tristate 188 189config CRC7 190 tristate 191 192config LIBCRC32C 193 tristate 194 select CRC32 195 help 196 This option just selects CRC32 and is provided for compatibility 197 purposes until the users are updated to select CRC32 directly. 198 199config CRC8 200 tristate 201 202config CRC_OPTIMIZATIONS 203 bool "Enable optimized CRC implementations" if EXPERT 204 default y 205 help 206 Disabling this option reduces code size slightly by disabling the 207 architecture-optimized implementations of any CRC variants that are 208 enabled. CRC checksumming performance may get much slower. 209 210 Keep this enabled unless you're really trying to minimize the size of 211 the kernel. 212 213config XXHASH 214 tristate 215 216config AUDIT_GENERIC 217 bool 218 depends on AUDIT && !AUDIT_ARCH 219 default y 220 221config AUDIT_ARCH_COMPAT_GENERIC 222 bool 223 default n 224 225config AUDIT_COMPAT_GENERIC 226 bool 227 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 228 default y 229 230config RANDOM32_SELFTEST 231 bool "PRNG perform self test on init" 232 help 233 This option enables the 32 bit PRNG library functions to perform a 234 self test on initialization. 235 236# 237# compression support is select'ed if needed 238# 239config 842_COMPRESS 240 select CRC32 241 tristate 242 243config 842_DECOMPRESS 244 select CRC32 245 tristate 246 247config ZLIB_INFLATE 248 tristate 249 250config ZLIB_DEFLATE 251 tristate 252 select BITREVERSE 253 254config ZLIB_DFLTCC 255 def_bool y 256 depends on S390 257 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib" 258 help 259 Enable s390x hardware support for zlib in the kernel. 260 261config LZO_COMPRESS 262 tristate 263 264config LZO_DECOMPRESS 265 tristate 266 267config LZ4_COMPRESS 268 tristate 269 270config LZ4HC_COMPRESS 271 tristate 272 273config LZ4_DECOMPRESS 274 tristate 275 276config ZSTD_COMMON 277 select XXHASH 278 tristate 279 280config ZSTD_COMPRESS 281 select ZSTD_COMMON 282 tristate 283 284config ZSTD_DECOMPRESS 285 select ZSTD_COMMON 286 tristate 287 288source "lib/xz/Kconfig" 289 290# 291# These all provide a common interface (hence the apparent duplication with 292# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 293# 294config DECOMPRESS_GZIP 295 select ZLIB_INFLATE 296 tristate 297 298config DECOMPRESS_BZIP2 299 tristate 300 301config DECOMPRESS_LZMA 302 tristate 303 304config DECOMPRESS_XZ 305 select XZ_DEC 306 tristate 307 308config DECOMPRESS_LZO 309 select LZO_DECOMPRESS 310 tristate 311 312config DECOMPRESS_LZ4 313 select LZ4_DECOMPRESS 314 tristate 315 316config DECOMPRESS_ZSTD 317 select ZSTD_DECOMPRESS 318 tristate 319 320# 321# Generic allocator support is selected if needed 322# 323config GENERIC_ALLOCATOR 324 bool 325 326# 327# reed solomon support is select'ed if needed 328# 329config REED_SOLOMON 330 tristate 331 332config REED_SOLOMON_ENC8 333 bool 334 335config REED_SOLOMON_DEC8 336 bool 337 338config REED_SOLOMON_ENC16 339 bool 340 341config REED_SOLOMON_DEC16 342 bool 343 344# 345# BCH support is selected if needed 346# 347config BCH 348 tristate 349 select BITREVERSE 350 351config BCH_CONST_PARAMS 352 bool 353 help 354 Drivers may select this option to force specific constant 355 values for parameters 'm' (Galois field order) and 't' 356 (error correction capability). Those specific values must 357 be set by declaring default values for symbols BCH_CONST_M 358 and BCH_CONST_T. 359 Doing so will enable extra compiler optimizations, 360 improving encoding and decoding performance up to 2x for 361 usual (m,t) values (typically such that m*t < 200). 362 When this option is selected, the BCH library supports 363 only a single (m,t) configuration. This is mainly useful 364 for NAND flash board drivers requiring known, fixed BCH 365 parameters. 366 367config BCH_CONST_M 368 int 369 range 5 15 370 help 371 Constant value for Galois field order 'm'. If 'k' is the 372 number of data bits to protect, 'm' should be chosen such 373 that (k + m*t) <= 2**m - 1. 374 Drivers should declare a default value for this symbol if 375 they select option BCH_CONST_PARAMS. 376 377config BCH_CONST_T 378 int 379 help 380 Constant value for error correction capability in bits 't'. 381 Drivers should declare a default value for this symbol if 382 they select option BCH_CONST_PARAMS. 383 384# 385# Textsearch support is select'ed if needed 386# 387config TEXTSEARCH 388 bool 389 390config TEXTSEARCH_KMP 391 tristate 392 393config TEXTSEARCH_BM 394 tristate 395 396config TEXTSEARCH_FSM 397 tristate 398 399config BTREE 400 bool 401 402config INTERVAL_TREE 403 bool 404 help 405 Simple, embeddable, interval-tree. Can find the start of an 406 overlapping range in log(n) time and then iterate over all 407 overlapping nodes. The algorithm is implemented as an 408 augmented rbtree. 409 410 See: 411 412 Documentation/core-api/rbtree.rst 413 414 for more information. 415 416config INTERVAL_TREE_SPAN_ITER 417 bool 418 depends on INTERVAL_TREE 419 420config XARRAY_MULTI 421 bool 422 help 423 Support entries which occupy multiple consecutive indices in the 424 XArray. 425 426config ASSOCIATIVE_ARRAY 427 bool 428 help 429 Generic associative array. Can be searched and iterated over whilst 430 it is being modified. It is also reasonably quick to search and 431 modify. The algorithms are non-recursive, and the trees are highly 432 capacious. 433 434 See: 435 436 Documentation/core-api/assoc_array.rst 437 438 for more information. 439 440config CLOSURES 441 bool 442 443config HAS_IOMEM 444 bool 445 depends on !NO_IOMEM 446 default y 447 448config HAS_IOPORT 449 bool 450 451config HAS_IOPORT_MAP 452 bool 453 depends on HAS_IOMEM && !NO_IOPORT_MAP 454 default y 455 456source "kernel/dma/Kconfig" 457 458config SGL_ALLOC 459 bool 460 default n 461 462config IOMMU_HELPER 463 bool 464 465config CHECK_SIGNATURE 466 bool 467 468config CPUMASK_OFFSTACK 469 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 470 help 471 Use dynamic allocation for cpumask_var_t, instead of putting 472 them on the stack. This is a bit more expensive, but avoids 473 stack overflow. 474 475config FORCE_NR_CPUS 476 def_bool !SMP 477 478config CPU_RMAP 479 bool 480 depends on SMP 481 482config DQL 483 bool 484 485config GLOB 486 bool 487# This actually supports modular compilation, but the module overhead 488# is ridiculous for the amount of code involved. Until an out-of-tree 489# driver asks for it, we'll just link it directly it into the kernel 490# when required. Since we're ignoring out-of-tree users, there's also 491# no need bother prompting for a manual decision: 492# prompt "glob_match() function" 493 help 494 This option provides a glob_match function for performing 495 simple text pattern matching. It originated in the ATA code 496 to blacklist particular drive models, but other device drivers 497 may need similar functionality. 498 499 All drivers in the Linux kernel tree that require this function 500 should automatically select this option. Say N unless you 501 are compiling an out-of tree driver which tells you that it 502 depends on this. 503 504config GLOB_SELFTEST 505 tristate "glob self-test on init" 506 depends on GLOB 507 help 508 This option enables a simple self-test of the glob_match 509 function on startup. It is primarily useful for people 510 working on the code to ensure they haven't introduced any 511 regressions. 512 513 It only adds a little bit of code and slows kernel boot (or 514 module load) by a small amount, so you're welcome to play with 515 it, but you probably don't need it. 516 517# 518# Netlink attribute parsing support is select'ed if needed 519# 520config NLATTR 521 bool 522 523# 524# Generic 64-bit atomic support is selected if needed 525# 526config GENERIC_ATOMIC64 527 bool 528 529config LRU_CACHE 530 tristate 531 532config CLZ_TAB 533 bool 534 535config IRQ_POLL 536 bool "IRQ polling library" 537 help 538 Helper library to poll interrupt mitigation using polling. 539 540config MPILIB 541 tristate 542 select CLZ_TAB 543 help 544 Multiprecision maths library from GnuPG. 545 It is used to implement RSA digital signature verification, 546 which is used by IMA/EVM digital signature extension. 547 548config SIGNATURE 549 tristate 550 depends on KEYS 551 select CRYPTO 552 select CRYPTO_SHA1 553 select MPILIB 554 help 555 Digital signature verification. Currently only RSA is supported. 556 Implementation is done using GnuPG MPI library 557 558config DIMLIB 559 tristate 560 depends on NET 561 help 562 Dynamic Interrupt Moderation library. 563 Implements an algorithm for dynamically changing CQ moderation values 564 according to run time performance. 565 566# 567# libfdt files, only selected if needed. 568# 569config LIBFDT 570 bool 571 572config OID_REGISTRY 573 tristate 574 help 575 Enable fast lookup object identifier registry. 576 577config UCS2_STRING 578 tristate 579 580# 581# generic vdso 582# 583source "lib/vdso/Kconfig" 584 585source "lib/fonts/Kconfig" 586 587config SG_SPLIT 588 def_bool n 589 help 590 Provides a helper to split scatterlists into chunks, each chunk being 591 a scatterlist. This should be selected by a driver or an API which 592 whishes to split a scatterlist amongst multiple DMA channels. 593 594config SG_POOL 595 def_bool n 596 help 597 Provides a helper to allocate chained scatterlists. This should be 598 selected by a driver or an API which whishes to allocate chained 599 scatterlist. 600 601# 602# sg chaining option 603# 604 605config ARCH_NO_SG_CHAIN 606 def_bool n 607 608config ARCH_HAS_PMEM_API 609 bool 610 611config MEMREGION 612 bool 613 614config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION 615 bool 616 617config ARCH_HAS_MEMREMAP_COMPAT_ALIGN 618 bool 619 620# use memcpy to implement user copies for nommu architectures 621config UACCESS_MEMCPY 622 bool 623 624config ARCH_HAS_UACCESS_FLUSHCACHE 625 bool 626 627# arch has a concept of a recoverable synchronous exception due to a 628# memory-read error like x86 machine-check or ARM data-abort, and 629# implements copy_mc_to_{user,kernel} to abort and report 630# 'bytes-transferred' if that exception fires when accessing the source 631# buffer. 632config ARCH_HAS_COPY_MC 633 bool 634 635# Temporary. Goes away when all archs are cleaned up 636config ARCH_STACKWALK 637 bool 638 639config STACKDEPOT 640 bool 641 select STACKTRACE 642 help 643 Stack depot: stack trace storage that avoids duplication 644 645config STACKDEPOT_ALWAYS_INIT 646 bool 647 select STACKDEPOT 648 help 649 Always initialize stack depot during early boot 650 651config STACKDEPOT_MAX_FRAMES 652 int "Maximum number of frames in trace saved in stack depot" 653 range 1 256 654 default 64 655 depends on STACKDEPOT 656 657config REF_TRACKER 658 bool 659 depends on STACKTRACE_SUPPORT 660 select STACKDEPOT 661 662config SBITMAP 663 bool 664 665config PARMAN 666 tristate "parman" if COMPILE_TEST 667 668config OBJAGG 669 tristate "objagg" if COMPILE_TEST 670 671config LWQ_TEST 672 bool "Boot-time test for lwq queuing" 673 help 674 Run boot-time test of light-weight queuing. 675 676endmenu 677 678config GENERIC_IOREMAP 679 bool 680 681config GENERIC_LIB_ASHLDI3 682 bool 683 684config GENERIC_LIB_ASHRDI3 685 bool 686 687config GENERIC_LIB_LSHRDI3 688 bool 689 690config GENERIC_LIB_MULDI3 691 bool 692 693config GENERIC_LIB_CMPDI2 694 bool 695 696config GENERIC_LIB_UCMPDI2 697 bool 698 699config GENERIC_LIB_DEVMEM_IS_ALLOWED 700 bool 701 702config PLDMFW 703 bool 704 default n 705 706config ASN1_ENCODER 707 tristate 708 709config POLYNOMIAL 710 tristate 711 712config FIRMWARE_TABLE 713 bool 714 715config UNION_FIND 716 bool 717 718config MIN_HEAP 719 bool 720