projects/linux·blob uaccess-cleanups · refs

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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 LINEAR_RANGES
12 tristate
13
14config PACKING
15 bool "Generic bitfield packing and unpacking"
16 select BITREVERSE
17 default n
18 help
19 This option provides the packing() helper function, which permits
20 converting bitfields between a CPU-usable representation and a
21 memory representation that can have any combination of these quirks:
22 - Is little endian (bytes are reversed within a 32-bit group)
23 - The least-significant 32-bit word comes first (within a 64-bit
24 group)
25 - The most significant bit of a byte is at its right (bit 0 of a
26 register description is numerically 2^7).
27 Drivers may use these helpers to match the bit indices as described
28 in the data sheets of the peripherals they are in control of.
29
30 When in doubt, say N.
31
32config PACKING_KUNIT_TEST
33 tristate "KUnit tests for packing library" if !KUNIT_ALL_TESTS
34 depends on PACKING && KUNIT
35 default KUNIT_ALL_TESTS
36 help
37 This builds KUnit tests for the packing library.
38
39 For more information on KUnit and unit tests in general,
40 please refer to the KUnit documentation in Documentation/dev-tools/kunit/.
41
42 When in doubt, say N.
43
44config BITREVERSE
45 tristate
46 select GENERIC_BITREVERSE if !HAVE_ARCH_BITREVERSE
47
48config HAVE_ARCH_BITREVERSE
49 bool
50 default n
51 depends on BITREVERSE
52 help
53 This option enables the use of hardware bit-reversal instructions on
54 architectures which support such operations.
55
56config GENERIC_BITREVERSE
57 tristate
58 depends on BITREVERSE
59 help
60 Generic bit reversal implementation. Drivers should never enable
61 it explicitly. Instead, enable BITREVERSE.
62
63 Architectures may want to select it as a fall-back option for
64 HAVE_ARCH_BITREVERSE, when the hardware-accelerated bit reverse
65 instruction set is optional, like RISC-V ZBKB extension.
66
67config ARCH_HAS_STRNCPY_FROM_USER
68 bool
69
70config ARCH_HAS_STRNLEN_USER
71 bool
72
73config GENERIC_STRNCPY_FROM_USER
74 def_bool !ARCH_HAS_STRNCPY_FROM_USER
75
76config GENERIC_STRNLEN_USER
77 def_bool !ARCH_HAS_STRNLEN_USER
78
79config GENERIC_NET_UTILS
80 bool
81
82source "lib/math/Kconfig"
83
84config NO_GENERIC_PCI_IOPORT_MAP
85 bool
86
87config GENERIC_IOMAP
88 bool
89 select GENERIC_PCI_IOMAP
90
91config STMP_DEVICE
92 bool
93
94config ARCH_USE_CMPXCHG_LOCKREF
95 bool
96
97config ARCH_HAS_FAST_MULTIPLIER
98 bool
99
100config ARCH_USE_SYM_ANNOTATIONS
101 bool
102
103config INDIRECT_PIO
104 bool "Access I/O in non-MMIO mode"
105 depends on ARM64
106 depends on HAS_IOPORT
107 help
108 On some platforms where no separate I/O space exists, there are I/O
109 hosts which can not be accessed in MMIO mode. Using the logical PIO
110 mechanism, the host-local I/O resource can be mapped into system
111 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
112 system can access the I/O devices with the mapped-logic PIO through
113 I/O accessors.
114
115 This way has relatively little I/O performance cost. Please make
116 sure your devices really need this configure item enabled.
117
118 When in doubt, say N.
119
120config INDIRECT_IOMEM
121 bool
122 help
123 This is selected by other options/architectures to provide the
124 emulated iomem accessors.
125
126config INDIRECT_IOMEM_FALLBACK
127 bool
128 depends on INDIRECT_IOMEM
129 help
130 If INDIRECT_IOMEM is selected, this enables falling back to plain
131 mmio accesses when the IO memory address is not a registered
132 emulated region.
133
134config TRACE_MMIO_ACCESS
135 bool "Register read/write tracing"
136 depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS
137 help
138 Create tracepoints for MMIO read/write operations. These trace events
139 can be used for logging all MMIO read/write operations.
140
141source "lib/crc/Kconfig"
142source "lib/crypto/Kconfig"
143source "lib/raid/Kconfig"
144
145config XXHASH
146 tristate
147
148config AUDIT_GENERIC
149 bool
150 depends on AUDIT && !AUDIT_ARCH
151 default y
152
153config AUDIT_ARCH_COMPAT_GENERIC
154 bool
155 default n
156
157config AUDIT_COMPAT_GENERIC
158 bool
159 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
160 default y
161
162#
163# compression support is select'ed if needed
164#
165config 842_COMPRESS
166 select CRC32
167 tristate
168
169config 842_DECOMPRESS
170 select CRC32
171 tristate
172
173config ZLIB_INFLATE
174 tristate
175
176config ZLIB_DEFLATE
177 tristate
178 select BITREVERSE
179
180config ZLIB_DFLTCC
181 def_bool y
182 depends on S390
183 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
184 help
185 Enable s390x hardware support for zlib in the kernel.
186
187config LZO_COMPRESS
188 tristate
189
190config LZO_DECOMPRESS
191 tristate
192
193config LZ4_COMPRESS
194 tristate
195
196config LZ4HC_COMPRESS
197 tristate
198
199config LZ4_DECOMPRESS
200 tristate
201
202config ZSTD_COMMON
203 select XXHASH
204 tristate
205
206config ZSTD_COMPRESS
207 select ZSTD_COMMON
208 tristate
209
210config ZSTD_DECOMPRESS
211 select ZSTD_COMMON
212 tristate
213
214source "lib/xz/Kconfig"
215
216#
217# These all provide a common interface (hence the apparent duplication with
218# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
219#
220config DECOMPRESS_GZIP
221 select ZLIB_INFLATE
222 tristate
223
224config DECOMPRESS_BZIP2
225 tristate
226
227config DECOMPRESS_LZMA
228 tristate
229
230config DECOMPRESS_XZ
231 select XZ_DEC
232 tristate
233
234config DECOMPRESS_LZO
235 select LZO_DECOMPRESS
236 tristate
237
238config DECOMPRESS_LZ4
239 select LZ4_DECOMPRESS
240 tristate
241
242config DECOMPRESS_ZSTD
243 select ZSTD_DECOMPRESS
244 tristate
245
246#
247# Generic allocator support is selected if needed
248#
249config GENERIC_ALLOCATOR
250 bool
251
252#
253# reed solomon support is select'ed if needed
254#
255config REED_SOLOMON
256 tristate
257
258config REED_SOLOMON_ENC8
259 bool
260
261config REED_SOLOMON_DEC8
262 bool
263
264config REED_SOLOMON_ENC16
265 bool
266
267config REED_SOLOMON_DEC16
268 bool
269
270#
271# BCH support is selected if needed
272#
273config BCH
274 tristate
275 select BITREVERSE
276
277config BCH_CONST_PARAMS
278 bool
279 help
280 Drivers may select this option to force specific constant
281 values for parameters 'm' (Galois field order) and 't'
282 (error correction capability). Those specific values must
283 be set by declaring default values for symbols BCH_CONST_M
284 and BCH_CONST_T.
285 Doing so will enable extra compiler optimizations,
286 improving encoding and decoding performance up to 2x for
287 usual (m,t) values (typically such that m*t < 200).
288 When this option is selected, the BCH library supports
289 only a single (m,t) configuration. This is mainly useful
290 for NAND flash board drivers requiring known, fixed BCH
291 parameters.
292
293config BCH_CONST_M
294 int
295 range 5 15
296 help
297 Constant value for Galois field order 'm'. If 'k' is the
298 number of data bits to protect, 'm' should be chosen such
299 that (k + m*t) <= 2**m - 1.
300 Drivers should declare a default value for this symbol if
301 they select option BCH_CONST_PARAMS.
302
303config BCH_CONST_T
304 int
305 help
306 Constant value for error correction capability in bits 't'.
307 Drivers should declare a default value for this symbol if
308 they select option BCH_CONST_PARAMS.
309
310#
311# Textsearch support is select'ed if needed
312#
313config TEXTSEARCH
314 bool
315
316config TEXTSEARCH_KMP
317 tristate
318
319config TEXTSEARCH_BM
320 tristate
321
322config TEXTSEARCH_FSM
323 tristate
324
325config BTREE
326 bool
327
328config INTERVAL_TREE
329 bool
330 help
331 Simple, embeddable, interval-tree. Can find the start of an
332 overlapping range in log(n) time and then iterate over all
333 overlapping nodes. The algorithm is implemented as an
334 augmented rbtree.
335
336 See:
337
338 Documentation/core-api/rbtree.rst
339
340 for more information.
341
342config INTERVAL_TREE_SPAN_ITER
343 bool
344 depends on INTERVAL_TREE
345
346config XARRAY_MULTI
347 bool
348 help
349 Support entries which occupy multiple consecutive indices in the
350 XArray.
351
352config ASSOCIATIVE_ARRAY
353 bool
354 help
355 Generic associative array. Can be searched and iterated over whilst
356 it is being modified. It is also reasonably quick to search and
357 modify. The algorithms are non-recursive, and the trees are highly
358 capacious.
359
360 See:
361
362 Documentation/core-api/assoc_array.rst
363
364 for more information.
365
366config CLOSURES
367 bool
368
369config HAS_IOMEM
370 bool
371 depends on !NO_IOMEM
372 default y
373
374config HAS_IOPORT
375 bool
376
377config HAS_IOPORT_MAP
378 bool
379 depends on HAS_IOMEM && !NO_IOPORT_MAP
380 default y
381
382source "kernel/dma/Kconfig"
383
384config SGL_ALLOC
385 bool
386 default n
387
388config IOMMU_HELPER
389 bool
390
391config CHECK_SIGNATURE
392 bool
393
394config CPUMASK_OFFSTACK
395 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
396 help
397 Use dynamic allocation for cpumask_var_t, instead of putting
398 them on the stack. This is a bit more expensive, but avoids
399 stack overflow.
400
401config FORCE_NR_CPUS
402 def_bool !SMP
403
404config CPU_RMAP
405 bool
406 depends on SMP
407
408config DQL
409 bool
410
411config GLOB
412 bool
413# This actually supports modular compilation, but the module overhead
414# is ridiculous for the amount of code involved. Until an out-of-tree
415# driver asks for it, we'll just link it directly it into the kernel
416# when required. Since we're ignoring out-of-tree users, there's also
417# no need bother prompting for a manual decision:
418# prompt "glob_match() function"
419 help
420 This option provides a glob_match function for performing
421 simple text pattern matching. It originated in the ATA code
422 to blacklist particular drive models, but other device drivers
423 may need similar functionality.
424
425 All drivers in the Linux kernel tree that require this function
426 should automatically select this option. Say N unless you
427 are compiling an out-of tree driver which tells you that it
428 depends on this.
429
430#
431# Netlink attribute parsing support is select'ed if needed
432#
433config NLATTR
434 bool
435
436#
437# Generic 64-bit atomic support is selected if needed
438#
439config GENERIC_ATOMIC64
440 bool
441
442config LRU_CACHE
443 tristate
444
445config CLZ_TAB
446 bool
447
448config IRQ_POLL
449 bool "IRQ polling library"
450 help
451 Helper library to poll interrupt mitigation using polling.
452
453config MPILIB
454 tristate
455 select CLZ_TAB
456 help
457 Multiprecision maths library from GnuPG.
458 It is used to implement RSA digital signature verification,
459 which is used by IMA/EVM digital signature extension.
460
461config SIGNATURE
462 tristate
463 depends on KEYS
464 select CRYPTO_LIB_SHA1
465 select MPILIB
466 help
467 Digital signature verification. Currently only RSA is supported.
468 Implementation is done using GnuPG MPI library
469
470config DIMLIB
471 tristate
472 depends on NET
473 help
474 Dynamic Interrupt Moderation library.
475 Implements an algorithm for dynamically changing CQ moderation values
476 according to run time performance.
477
478#
479# libfdt files, only selected if needed.
480#
481config LIBFDT
482 bool
483
484config OID_REGISTRY
485 tristate
486 help
487 Enable fast lookup object identifier registry.
488
489config UCS2_STRING
490 tristate
491
492#
493# generic vdso
494#
495source "lib/vdso/Kconfig"
496
497source "lib/fonts/Kconfig"
498
499config SG_SPLIT
500 def_bool n
501 help
502 Provides a helper to split scatterlists into chunks, each chunk being
503 a scatterlist. This should be selected by a driver or an API which
504 whishes to split a scatterlist amongst multiple DMA channels.
505
506config SG_POOL
507 def_bool n
508 help
509 Provides a helper to allocate chained scatterlists. This should be
510 selected by a driver or an API which whishes to allocate chained
511 scatterlist.
512
513#
514# sg chaining option
515#
516
517config ARCH_NO_SG_CHAIN
518 def_bool n
519
520config ARCH_HAS_PMEM_API
521 bool
522
523config MEMREGION
524 bool
525
526config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
527 bool
528
529config GENERIC_CPU_CACHE_MAINTENANCE
530 bool
531
532config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
533 bool
534
535# use memcpy to implement user copies for nommu architectures
536config UACCESS_MEMCPY
537 bool
538
539config ARCH_HAS_UACCESS_FLUSHCACHE
540 bool
541
542# arch has a concept of a recoverable synchronous exception due to a
543# memory-read error like x86 machine-check or ARM data-abort, and
544# implements copy_mc_to_{user,kernel} to abort and report
545# 'bytes-transferred' if that exception fires when accessing the source
546# buffer.
547config ARCH_HAS_COPY_MC
548 bool
549
550# Temporary. Goes away when all archs are cleaned up
551config ARCH_STACKWALK
552 bool
553
554config STACKDEPOT
555 bool
556 select STACKTRACE
557 help
558 Stack depot: stack trace storage that avoids duplication
559
560config STACKDEPOT_ALWAYS_INIT
561 bool
562 select STACKDEPOT
563 help
564 Always initialize stack depot during early boot
565
566config STACKDEPOT_MAX_FRAMES
567 int "Maximum number of frames in trace saved in stack depot"
568 range 1 256
569 default 64
570 depends on STACKDEPOT
571
572config REF_TRACKER
573 bool
574 depends on STACKTRACE_SUPPORT
575 select STACKDEPOT
576
577config SBITMAP
578 bool
579
580config PARMAN
581 tristate "parman" if COMPILE_TEST
582
583config OBJAGG
584 tristate "objagg" if COMPILE_TEST
585
586config LWQ_TEST
587 bool "Boot-time test for lwq queuing"
588 help
589 Run boot-time test of light-weight queuing.
590
591endmenu
592
593config GENERIC_IOREMAP
594 bool
595
596config GENERIC_LIB_ASHLDI3
597 bool
598
599config GENERIC_LIB_ASHRDI3
600 bool
601
602config GENERIC_LIB_LSHRDI3
603 bool
604
605config GENERIC_LIB_MULDI3
606 bool
607
608config GENERIC_LIB_CMPDI2
609 bool
610
611config GENERIC_LIB_UCMPDI2
612 bool
613
614config GENERIC_LIB_DEVMEM_IS_ALLOWED
615 bool
616
617config PLDMFW
618 bool
619 select CRC32
620 default n
621
622config ASN1_ENCODER
623 tristate
624
625config FIRMWARE_TABLE
626 bool
627
628config UNION_FIND
629 bool
630
631config MIN_HEAP
632 bool