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/crc/Kconfig" 140source "lib/crypto/Kconfig" 141 142config XXHASH 143 tristate 144 145config AUDIT_GENERIC 146 bool 147 depends on AUDIT && !AUDIT_ARCH 148 default y 149 150config AUDIT_ARCH_COMPAT_GENERIC 151 bool 152 default n 153 154config AUDIT_COMPAT_GENERIC 155 bool 156 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 157 default y 158 159config RANDOM32_SELFTEST 160 bool "PRNG perform self test on init" 161 help 162 This option enables the 32 bit PRNG library functions to perform a 163 self test on initialization. 164 165# 166# compression support is select'ed if needed 167# 168config 842_COMPRESS 169 select CRC32 170 tristate 171 172config 842_DECOMPRESS 173 select CRC32 174 tristate 175 176config ZLIB_INFLATE 177 tristate 178 179config ZLIB_DEFLATE 180 tristate 181 select BITREVERSE 182 183config ZLIB_DFLTCC 184 def_bool y 185 depends on S390 186 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib" 187 help 188 Enable s390x hardware support for zlib in the kernel. 189 190config LZO_COMPRESS 191 tristate 192 193config LZO_DECOMPRESS 194 tristate 195 196config LZ4_COMPRESS 197 tristate 198 199config LZ4HC_COMPRESS 200 tristate 201 202config LZ4_DECOMPRESS 203 tristate 204 205config ZSTD_COMMON 206 select XXHASH 207 tristate 208 209config ZSTD_COMPRESS 210 select ZSTD_COMMON 211 tristate 212 213config ZSTD_DECOMPRESS 214 select ZSTD_COMMON 215 tristate 216 217source "lib/xz/Kconfig" 218 219# 220# These all provide a common interface (hence the apparent duplication with 221# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 222# 223config DECOMPRESS_GZIP 224 select ZLIB_INFLATE 225 tristate 226 227config DECOMPRESS_BZIP2 228 tristate 229 230config DECOMPRESS_LZMA 231 tristate 232 233config DECOMPRESS_XZ 234 select XZ_DEC 235 tristate 236 237config DECOMPRESS_LZO 238 select LZO_DECOMPRESS 239 tristate 240 241config DECOMPRESS_LZ4 242 select LZ4_DECOMPRESS 243 tristate 244 245config DECOMPRESS_ZSTD 246 select ZSTD_DECOMPRESS 247 tristate 248 249# 250# Generic allocator support is selected if needed 251# 252config GENERIC_ALLOCATOR 253 bool 254 255# 256# reed solomon support is select'ed if needed 257# 258config REED_SOLOMON 259 tristate 260 261config REED_SOLOMON_ENC8 262 bool 263 264config REED_SOLOMON_DEC8 265 bool 266 267config REED_SOLOMON_ENC16 268 bool 269 270config REED_SOLOMON_DEC16 271 bool 272 273# 274# BCH support is selected if needed 275# 276config BCH 277 tristate 278 select BITREVERSE 279 280config BCH_CONST_PARAMS 281 bool 282 help 283 Drivers may select this option to force specific constant 284 values for parameters 'm' (Galois field order) and 't' 285 (error correction capability). Those specific values must 286 be set by declaring default values for symbols BCH_CONST_M 287 and BCH_CONST_T. 288 Doing so will enable extra compiler optimizations, 289 improving encoding and decoding performance up to 2x for 290 usual (m,t) values (typically such that m*t < 200). 291 When this option is selected, the BCH library supports 292 only a single (m,t) configuration. This is mainly useful 293 for NAND flash board drivers requiring known, fixed BCH 294 parameters. 295 296config BCH_CONST_M 297 int 298 range 5 15 299 help 300 Constant value for Galois field order 'm'. If 'k' is the 301 number of data bits to protect, 'm' should be chosen such 302 that (k + m*t) <= 2**m - 1. 303 Drivers should declare a default value for this symbol if 304 they select option BCH_CONST_PARAMS. 305 306config BCH_CONST_T 307 int 308 help 309 Constant value for error correction capability in bits 't'. 310 Drivers should declare a default value for this symbol if 311 they select option BCH_CONST_PARAMS. 312 313# 314# Textsearch support is select'ed if needed 315# 316config TEXTSEARCH 317 bool 318 319config TEXTSEARCH_KMP 320 tristate 321 322config TEXTSEARCH_BM 323 tristate 324 325config TEXTSEARCH_FSM 326 tristate 327 328config BTREE 329 bool 330 331config INTERVAL_TREE 332 bool 333 help 334 Simple, embeddable, interval-tree. Can find the start of an 335 overlapping range in log(n) time and then iterate over all 336 overlapping nodes. The algorithm is implemented as an 337 augmented rbtree. 338 339 See: 340 341 Documentation/core-api/rbtree.rst 342 343 for more information. 344 345config INTERVAL_TREE_SPAN_ITER 346 bool 347 depends on INTERVAL_TREE 348 349config XARRAY_MULTI 350 bool 351 help 352 Support entries which occupy multiple consecutive indices in the 353 XArray. 354 355config ASSOCIATIVE_ARRAY 356 bool 357 help 358 Generic associative array. Can be searched and iterated over whilst 359 it is being modified. It is also reasonably quick to search and 360 modify. The algorithms are non-recursive, and the trees are highly 361 capacious. 362 363 See: 364 365 Documentation/core-api/assoc_array.rst 366 367 for more information. 368 369config CLOSURES 370 bool 371 372config HAS_IOMEM 373 bool 374 depends on !NO_IOMEM 375 default y 376 377config HAS_IOPORT 378 bool 379 380config HAS_IOPORT_MAP 381 bool 382 depends on HAS_IOMEM && !NO_IOPORT_MAP 383 default y 384 385source "kernel/dma/Kconfig" 386 387config SGL_ALLOC 388 bool 389 default n 390 391config IOMMU_HELPER 392 bool 393 394config CHECK_SIGNATURE 395 bool 396 397config CPUMASK_OFFSTACK 398 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 399 help 400 Use dynamic allocation for cpumask_var_t, instead of putting 401 them on the stack. This is a bit more expensive, but avoids 402 stack overflow. 403 404config FORCE_NR_CPUS 405 def_bool !SMP 406 407config CPU_RMAP 408 bool 409 depends on SMP 410 411config DQL 412 bool 413 414config GLOB 415 bool 416# This actually supports modular compilation, but the module overhead 417# is ridiculous for the amount of code involved. Until an out-of-tree 418# driver asks for it, we'll just link it directly it into the kernel 419# when required. Since we're ignoring out-of-tree users, there's also 420# no need bother prompting for a manual decision: 421# prompt "glob_match() function" 422 help 423 This option provides a glob_match function for performing 424 simple text pattern matching. It originated in the ATA code 425 to blacklist particular drive models, but other device drivers 426 may need similar functionality. 427 428 All drivers in the Linux kernel tree that require this function 429 should automatically select this option. Say N unless you 430 are compiling an out-of tree driver which tells you that it 431 depends on this. 432 433# 434# Netlink attribute parsing support is select'ed if needed 435# 436config NLATTR 437 bool 438 439# 440# Generic 64-bit atomic support is selected if needed 441# 442config GENERIC_ATOMIC64 443 bool 444 445config LRU_CACHE 446 tristate 447 448config CLZ_TAB 449 bool 450 451config IRQ_POLL 452 bool "IRQ polling library" 453 help 454 Helper library to poll interrupt mitigation using polling. 455 456config MPILIB 457 tristate 458 select CLZ_TAB 459 help 460 Multiprecision maths library from GnuPG. 461 It is used to implement RSA digital signature verification, 462 which is used by IMA/EVM digital signature extension. 463 464config SIGNATURE 465 tristate 466 depends on KEYS 467 select CRYPTO_LIB_SHA1 468 select MPILIB 469 help 470 Digital signature verification. Currently only RSA is supported. 471 Implementation is done using GnuPG MPI library 472 473config DIMLIB 474 tristate 475 depends on NET 476 help 477 Dynamic Interrupt Moderation library. 478 Implements an algorithm for dynamically changing CQ moderation values 479 according to run time performance. 480 481# 482# libfdt files, only selected if needed. 483# 484config LIBFDT 485 bool 486 487config OID_REGISTRY 488 tristate 489 help 490 Enable fast lookup object identifier registry. 491 492config UCS2_STRING 493 tristate 494 495# 496# generic vdso 497# 498source "lib/vdso/Kconfig" 499 500source "lib/fonts/Kconfig" 501 502config SG_SPLIT 503 def_bool n 504 help 505 Provides a helper to split scatterlists into chunks, each chunk being 506 a scatterlist. This should be selected by a driver or an API which 507 whishes to split a scatterlist amongst multiple DMA channels. 508 509config SG_POOL 510 def_bool n 511 help 512 Provides a helper to allocate chained scatterlists. This should be 513 selected by a driver or an API which whishes to allocate chained 514 scatterlist. 515 516# 517# sg chaining option 518# 519 520config ARCH_NO_SG_CHAIN 521 def_bool n 522 523config ARCH_HAS_PMEM_API 524 bool 525 526config MEMREGION 527 bool 528 529config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION 530 bool 531 532config GENERIC_CPU_CACHE_MAINTENANCE 533 bool 534 535config ARCH_HAS_MEMREMAP_COMPAT_ALIGN 536 bool 537 538# use memcpy to implement user copies for nommu architectures 539config UACCESS_MEMCPY 540 bool 541 542config ARCH_HAS_UACCESS_FLUSHCACHE 543 bool 544 545# arch has a concept of a recoverable synchronous exception due to a 546# memory-read error like x86 machine-check or ARM data-abort, and 547# implements copy_mc_to_{user,kernel} to abort and report 548# 'bytes-transferred' if that exception fires when accessing the source 549# buffer. 550config ARCH_HAS_COPY_MC 551 bool 552 553# Temporary. Goes away when all archs are cleaned up 554config ARCH_STACKWALK 555 bool 556 557config STACKDEPOT 558 bool 559 select STACKTRACE 560 help 561 Stack depot: stack trace storage that avoids duplication 562 563config STACKDEPOT_ALWAYS_INIT 564 bool 565 select STACKDEPOT 566 help 567 Always initialize stack depot during early boot 568 569config STACKDEPOT_MAX_FRAMES 570 int "Maximum number of frames in trace saved in stack depot" 571 range 1 256 572 default 64 573 depends on STACKDEPOT 574 575config REF_TRACKER 576 bool 577 depends on STACKTRACE_SUPPORT 578 select STACKDEPOT 579 580config SBITMAP 581 bool 582 583config PARMAN 584 tristate "parman" if COMPILE_TEST 585 586config OBJAGG 587 tristate "objagg" if COMPILE_TEST 588 589config LWQ_TEST 590 bool "Boot-time test for lwq queuing" 591 help 592 Run boot-time test of light-weight queuing. 593 594endmenu 595 596config GENERIC_IOREMAP 597 bool 598 599config GENERIC_LIB_ASHLDI3 600 bool 601 602config GENERIC_LIB_ASHRDI3 603 bool 604 605config GENERIC_LIB_LSHRDI3 606 bool 607 608config GENERIC_LIB_MULDI3 609 bool 610 611config GENERIC_LIB_CMPDI2 612 bool 613 614config GENERIC_LIB_UCMPDI2 615 bool 616 617config GENERIC_LIB_DEVMEM_IS_ALLOWED 618 bool 619 620config PLDMFW 621 bool 622 select CRC32 623 default n 624 625config ASN1_ENCODER 626 tristate 627 628config POLYNOMIAL 629 tristate 630 631config FIRMWARE_TABLE 632 bool 633 634config UNION_FIND 635 bool 636 637config MIN_HEAP 638 bool 639