1 # SPDX-License-Identifier: GPL-2.0-only 2 # 3 # Library configuration 4 # 5 6 config BINARY_PRINTF 7 def_bool n 8 9 menu "Library routines" 10 11 config RAID6_PQ 12 tristate 13 14 config 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 22 config LINEAR_RANGES 23 tristate 24 25 config 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 43 config BITREVERSE 44 tristate 45 46 config HAVE_ARCH_BITREVERSE 47 bool 48 default n 49 help 50 This option enables the use of hardware bit-reversal instructions on 51 architectures which support such operations. 52 53 config ARCH_HAS_STRNCPY_FROM_USER 54 bool 55 56 config ARCH_HAS_STRNLEN_USER 57 bool 58 59 config GENERIC_STRNCPY_FROM_USER 60 def_bool !ARCH_HAS_STRNCPY_FROM_USER 61 62 config GENERIC_STRNLEN_USER 63 def_bool !ARCH_HAS_STRNLEN_USER 64 65 config GENERIC_NET_UTILS 66 bool 67 68 source "lib/math/Kconfig" 69 70 config NO_GENERIC_PCI_IOPORT_MAP 71 bool 72 73 config GENERIC_IOMAP 74 bool 75 select GENERIC_PCI_IOMAP 76 77 config STMP_DEVICE 78 bool 79 80 config ARCH_USE_CMPXCHG_LOCKREF 81 bool 82 83 config ARCH_HAS_FAST_MULTIPLIER 84 bool 85 86 config ARCH_USE_SYM_ANNOTATIONS 87 bool 88 89 config INDIRECT_PIO 90 bool "Access I/O in non-MMIO mode" 91 depends on ARM64 92 depends on HAS_IOPORT 93 help 94 On some platforms where no separate I/O space exists, there are I/O 95 hosts which can not be accessed in MMIO mode. Using the logical PIO 96 mechanism, the host-local I/O resource can be mapped into system 97 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the 98 system can access the I/O devices with the mapped-logic PIO through 99 I/O accessors. 100 101 This way has relatively little I/O performance cost. Please make 102 sure your devices really need this configure item enabled. 103 104 When in doubt, say N. 105 106 config INDIRECT_IOMEM 107 bool 108 help 109 This is selected by other options/architectures to provide the 110 emulated iomem accessors. 111 112 config INDIRECT_IOMEM_FALLBACK 113 bool 114 depends on INDIRECT_IOMEM 115 help 116 If INDIRECT_IOMEM is selected, this enables falling back to plain 117 mmio accesses when the IO memory address is not a registered 118 emulated region. 119 120 config TRACE_MMIO_ACCESS 121 bool "Register read/write tracing" 122 depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS 123 help 124 Create tracepoints for MMIO read/write operations. These trace events 125 can be used for logging all MMIO read/write operations. 126 127 source "lib/crypto/Kconfig" 128 129 config CRC_CCITT 130 tristate "CRC-CCITT functions" 131 help 132 This option is provided for the case where no in-kernel-tree 133 modules require CRC-CCITT functions, but a module built outside 134 the kernel tree does. Such modules that use library CRC-CCITT 135 functions require M here. 136 137 config CRC16 138 tristate "CRC16 functions" 139 help 140 This option is provided for the case where no in-kernel-tree 141 modules require CRC16 functions, but a module built outside 142 the kernel tree does. Such modules that use library CRC16 143 functions require M here. 144 145 config CRC_T10DIF 146 tristate "CRC calculation for the T10 Data Integrity Field" 147 select CRYPTO 148 select CRYPTO_CRCT10DIF 149 help 150 This option is only needed if a module that's not in the 151 kernel tree needs to calculate CRC checks for use with the 152 SCSI data integrity subsystem. 153 154 config CRC64_ROCKSOFT 155 tristate "CRC calculation for the Rocksoft model CRC64" 156 select CRC64 157 select CRYPTO 158 select CRYPTO_CRC64_ROCKSOFT 159 help 160 This option provides a CRC64 API to a registered crypto driver. 161 This is used with the block layer's data integrity subsystem. 162 163 config CRC_ITU_T 164 tristate "CRC ITU-T V.41 functions" 165 help 166 This option is provided for the case where no in-kernel-tree 167 modules require CRC ITU-T V.41 functions, but a module built outside 168 the kernel tree does. Such modules that use library CRC ITU-T V.41 169 functions require M here. 170 171 config CRC32 172 tristate "CRC32/CRC32c functions" 173 default y 174 select BITREVERSE 175 help 176 This option is provided for the case where no in-kernel-tree 177 modules require CRC32/CRC32c functions, but a module built outside 178 the kernel tree does. Such modules that use library CRC32/CRC32c 179 functions require M here. 180 181 config CRC32_SELFTEST 182 tristate "CRC32 perform self test on init" 183 depends on CRC32 184 help 185 This option enables the CRC32 library functions to perform a 186 self test on initialization. The self test computes crc32_le 187 and crc32_be over byte strings with random alignment and length 188 and computes the total elapsed time and number of bytes processed. 189 190 choice 191 prompt "CRC32 implementation" 192 depends on CRC32 193 default CRC32_SLICEBY8 194 help 195 This option allows a kernel builder to override the default choice 196 of CRC32 algorithm. Choose the default ("slice by 8") unless you 197 know that you need one of the others. 198 199 config CRC32_SLICEBY8 200 bool "Slice by 8 bytes" 201 help 202 Calculate checksum 8 bytes at a time with a clever slicing algorithm. 203 This is the fastest algorithm, but comes with a 8KiB lookup table. 204 Most modern processors have enough cache to hold this table without 205 thrashing the cache. 206 207 This is the default implementation choice. Choose this one unless 208 you have a good reason not to. 209 210 config CRC32_SLICEBY4 211 bool "Slice by 4 bytes" 212 help 213 Calculate checksum 4 bytes at a time with a clever slicing algorithm. 214 This is a bit slower than slice by 8, but has a smaller 4KiB lookup 215 table. 216 217 Only choose this option if you know what you are doing. 218 219 config CRC32_SARWATE 220 bool "Sarwate's Algorithm (one byte at a time)" 221 help 222 Calculate checksum a byte at a time using Sarwate's algorithm. This 223 is not particularly fast, but has a small 256 byte lookup table. 224 225 Only choose this option if you know what you are doing. 226 227 config CRC32_BIT 228 bool "Classic Algorithm (one bit at a time)" 229 help 230 Calculate checksum one bit at a time. This is VERY slow, but has 231 no lookup table. This is provided as a debugging option. 232 233 Only choose this option if you are debugging crc32. 234 235 endchoice 236 237 config CRC64 238 tristate "CRC64 functions" 239 help 240 This option is provided for the case where no in-kernel-tree 241 modules require CRC64 functions, but a module built outside 242 the kernel tree does. Such modules that use library CRC64 243 functions require M here. 244 245 config CRC4 246 tristate "CRC4 functions" 247 help 248 This option is provided for the case where no in-kernel-tree 249 modules require CRC4 functions, but a module built outside 250 the kernel tree does. Such modules that use library CRC4 251 functions require M here. 252 253 config CRC7 254 tristate "CRC7 functions" 255 help 256 This option is provided for the case where no in-kernel-tree 257 modules require CRC7 functions, but a module built outside 258 the kernel tree does. Such modules that use library CRC7 259 functions require M here. 260 261 config LIBCRC32C 262 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 263 select CRYPTO 264 select CRYPTO_CRC32C 265 help 266 This option is provided for the case where no in-kernel-tree 267 modules require CRC32c functions, but a module built outside the 268 kernel tree does. Such modules that use library CRC32c functions 269 require M here. See Castagnoli93. 270 Module will be libcrc32c. 271 272 config CRC8 273 tristate "CRC8 function" 274 help 275 This option provides CRC8 function. Drivers may select this 276 when they need to do cyclic redundancy check according CRC8 277 algorithm. Module will be called crc8. 278 279 config XXHASH 280 tristate 281 282 config AUDIT_GENERIC 283 bool 284 depends on AUDIT && !AUDIT_ARCH 285 default y 286 287 config AUDIT_ARCH_COMPAT_GENERIC 288 bool 289 default n 290 291 config AUDIT_COMPAT_GENERIC 292 bool 293 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 294 default y 295 296 config RANDOM32_SELFTEST 297 bool "PRNG perform self test on init" 298 help 299 This option enables the 32 bit PRNG library functions to perform a 300 self test on initialization. 301 302 # 303 # compression support is select'ed if needed 304 # 305 config 842_COMPRESS 306 select CRC32 307 tristate 308 309 config 842_DECOMPRESS 310 select CRC32 311 tristate 312 313 config ZLIB_INFLATE 314 tristate 315 316 config ZLIB_DEFLATE 317 tristate 318 select BITREVERSE 319 320 config ZLIB_DFLTCC 321 def_bool y 322 depends on S390 323 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib" 324 help 325 Enable s390x hardware support for zlib in the kernel. 326 327 config LZO_COMPRESS 328 tristate 329 330 config LZO_DECOMPRESS 331 tristate 332 333 config LZ4_COMPRESS 334 tristate 335 336 config LZ4HC_COMPRESS 337 tristate 338 339 config LZ4_DECOMPRESS 340 tristate 341 342 config ZSTD_COMMON 343 select XXHASH 344 tristate 345 346 config ZSTD_COMPRESS 347 select ZSTD_COMMON 348 tristate 349 350 config ZSTD_DECOMPRESS 351 select ZSTD_COMMON 352 tristate 353 354 source "lib/xz/Kconfig" 355 356 # 357 # These all provide a common interface (hence the apparent duplication with 358 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 359 # 360 config DECOMPRESS_GZIP 361 select ZLIB_INFLATE 362 tristate 363 364 config DECOMPRESS_BZIP2 365 tristate 366 367 config DECOMPRESS_LZMA 368 tristate 369 370 config DECOMPRESS_XZ 371 select XZ_DEC 372 tristate 373 374 config DECOMPRESS_LZO 375 select LZO_DECOMPRESS 376 tristate 377 378 config DECOMPRESS_LZ4 379 select LZ4_DECOMPRESS 380 tristate 381 382 config DECOMPRESS_ZSTD 383 select ZSTD_DECOMPRESS 384 tristate 385 386 # 387 # Generic allocator support is selected if needed 388 # 389 config GENERIC_ALLOCATOR 390 bool 391 392 # 393 # reed solomon support is select'ed if needed 394 # 395 config REED_SOLOMON 396 tristate 397 398 config REED_SOLOMON_ENC8 399 bool 400 401 config REED_SOLOMON_DEC8 402 bool 403 404 config REED_SOLOMON_ENC16 405 bool 406 407 config REED_SOLOMON_DEC16 408 bool 409 410 # 411 # BCH support is selected if needed 412 # 413 config BCH 414 tristate 415 select BITREVERSE 416 417 config 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. 432 433 config 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. 442 443 config 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 # 453 config TEXTSEARCH 454 bool 455 456 config TEXTSEARCH_KMP 457 tristate 458 459 config TEXTSEARCH_BM 460 tristate 461 462 config TEXTSEARCH_FSM 463 tristate 464 465 config BTREE 466 bool 467 468 config 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. 481 482 config INTERVAL_TREE_SPAN_ITER 483 bool 484 depends on INTERVAL_TREE 485 486 config XARRAY_MULTI 487 bool 488 help 489 Support entries which occupy multiple consecutive indices in the 490 XArray. 491 492 config ASSOCIATIVE_ARRAY 493 bool 494 help 495 Generic associative array. Can be searched and iterated over whilst 496 it is being modified. It is also reasonably quick to search and 497 modify. The algorithms are non-recursive, and the trees are highly 498 capacious. 499 500 See: 501 502 Documentation/core-api/assoc_array.rst 503 504 for more information. 505 506 config CLOSURES 507 bool 508 509 config HAS_IOMEM 510 bool 511 depends on !NO_IOMEM 512 default y 513 514 config HAS_IOPORT 515 bool 516 517 config HAS_IOPORT_MAP 518 bool 519 depends on HAS_IOMEM && !NO_IOPORT_MAP 520 default y 521 522 source "kernel/dma/Kconfig" 523 524 config SGL_ALLOC 525 bool 526 default n 527 528 config IOMMU_HELPER 529 bool 530 531 config CHECK_SIGNATURE 532 bool 533 534 config CPUMASK_OFFSTACK 535 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 536 help 537 Use dynamic allocation for cpumask_var_t, instead of putting 538 them on the stack. This is a bit more expensive, but avoids 539 stack overflow. 540 541 config FORCE_NR_CPUS 542 def_bool !SMP 543 544 config CPU_RMAP 545 bool 546 depends on SMP 547 548 config DQL 549 bool 550 551 config GLOB 552 bool 553 # This actually supports modular compilation, but the module overhead 554 # is ridiculous for the amount of code involved. Until an out-of-tree 555 # driver asks for it, we'll just link it directly it into the kernel 556 # when required. Since we're ignoring out-of-tree users, there's also 557 # no need bother prompting for a manual decision: 558 # prompt "glob_match() function" 559 help 560 This option provides a glob_match function for performing 561 simple text pattern matching. It originated in the ATA code 562 to blacklist particular drive models, but other device drivers 563 may need similar functionality. 564 565 All drivers in the Linux kernel tree that require this function 566 should automatically select this option. Say N unless you 567 are compiling an out-of tree driver which tells you that it 568 depends on this. 569 570 config GLOB_SELFTEST 571 tristate "glob self-test on init" 572 depends on GLOB 573 help 574 This option enables a simple self-test of the glob_match 575 function on startup. It is primarily useful for people 576 working on the code to ensure they haven't introduced any 577 regressions. 578 579 It only adds a little bit of code and slows kernel boot (or 580 module load) by a small amount, so you're welcome to play with 581 it, but you probably don't need it. 582 583 # 584 # Netlink attribute parsing support is select'ed if needed 585 # 586 config NLATTR 587 bool 588 589 # 590 # Generic 64-bit atomic support is selected if needed 591 # 592 config GENERIC_ATOMIC64 593 bool 594 595 config LRU_CACHE 596 tristate 597 598 config CLZ_TAB 599 bool 600 601 config IRQ_POLL 602 bool "IRQ polling library" 603 help 604 Helper library to poll interrupt mitigation using polling. 605 606 config MPILIB 607 tristate 608 select CLZ_TAB 609 help 610 Multiprecision maths library from GnuPG. 611 It is used to implement RSA digital signature verification, 612 which is used by IMA/EVM digital signature extension. 613 614 config SIGNATURE 615 tristate 616 depends on KEYS 617 select CRYPTO 618 select CRYPTO_SHA1 619 select MPILIB 620 help 621 Digital signature verification. Currently only RSA is supported. 622 Implementation is done using GnuPG MPI library 623 624 config DIMLIB 625 tristate 626 depends on NET 627 help 628 Dynamic Interrupt Moderation library. 629 Implements an algorithm for dynamically changing CQ moderation values 630 according to run time performance. 631 632 # 633 # libfdt files, only selected if needed. 634 # 635 config LIBFDT 636 bool 637 638 config OID_REGISTRY 639 tristate 640 help 641 Enable fast lookup object identifier registry. 642 643 config UCS2_STRING 644 tristate 645 646 # 647 # generic vdso 648 # 649 source "lib/vdso/Kconfig" 650 651 source "lib/fonts/Kconfig" 652 653 config SG_SPLIT 654 def_bool n 655 help 656 Provides a helper to split scatterlists into chunks, each chunk being 657 a scatterlist. This should be selected by a driver or an API which 658 whishes to split a scatterlist amongst multiple DMA channels. 659 660 config SG_POOL 661 def_bool n 662 help 663 Provides a helper to allocate chained scatterlists. This should be 664 selected by a driver or an API which whishes to allocate chained 665 scatterlist. 666 667 # 668 # sg chaining option 669 # 670 671 config ARCH_NO_SG_CHAIN 672 def_bool n 673 674 config ARCH_HAS_PMEM_API 675 bool 676 677 config MEMREGION 678 bool 679 680 config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION 681 bool 682 683 config ARCH_HAS_MEMREMAP_COMPAT_ALIGN 684 bool 685 686 # use memcpy to implement user copies for nommu architectures 687 config UACCESS_MEMCPY 688 bool 689 690 config ARCH_HAS_UACCESS_FLUSHCACHE 691 bool 692 693 # arch has a concept of a recoverable synchronous exception due to a 694 # memory-read error like x86 machine-check or ARM data-abort, and 695 # implements copy_mc_to_{user,kernel} to abort and report 696 # 'bytes-transferred' if that exception fires when accessing the source 697 # buffer. 698 config ARCH_HAS_COPY_MC 699 bool 700 701 # Temporary. Goes away when all archs are cleaned up 702 config ARCH_STACKWALK 703 bool 704 705 config STACKDEPOT 706 bool 707 select STACKTRACE 708 help 709 Stack depot: stack trace storage that avoids duplication 710 711 config STACKDEPOT_ALWAYS_INIT 712 bool 713 select STACKDEPOT 714 help 715 Always initialize stack depot during early boot 716 717 config STACKDEPOT_MAX_FRAMES 718 int "Maximum number of frames in trace saved in stack depot" 719 range 1 256 720 default 64 721 depends on STACKDEPOT 722 723 config REF_TRACKER 724 bool 725 depends on STACKTRACE_SUPPORT 726 select STACKDEPOT 727 728 config SBITMAP 729 bool 730 731 config PARMAN 732 tristate "parman" if COMPILE_TEST 733 734 config OBJAGG 735 tristate "objagg" if COMPILE_TEST 736 737 config LWQ_TEST 738 bool "Boot-time test for lwq queuing" 739 help 740 Run boot-time test of light-weight queuing. 741 742 endmenu 743 744 config GENERIC_IOREMAP 745 bool 746 747 config GENERIC_LIB_ASHLDI3 748 bool 749 750 config GENERIC_LIB_ASHRDI3 751 bool 752 753 config GENERIC_LIB_LSHRDI3 754 bool 755 756 config GENERIC_LIB_MULDI3 757 bool 758 759 config GENERIC_LIB_CMPDI2 760 bool 761 762 config GENERIC_LIB_UCMPDI2 763 bool 764 765 config GENERIC_LIB_DEVMEM_IS_ALLOWED 766 bool 767 768 config PLDMFW 769 bool 770 default n 771 772 config ASN1_ENCODER 773 tristate 774 775 config POLYNOMIAL 776 tristate 777 778 config FIRMWARE_TABLE 779 bool 780