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