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Commit | Line | Data |
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1 | # | |
2 | # Library configuration | |
3 | # | |
4 | ||
5 | config BINARY_PRINTF | |
6 | def_bool n | |
7 | ||
8 | menu "Library routines" | |
9 | ||
10 | config RAID6_PQ | |
11 | tristate | |
12 | ||
13 | config BITREVERSE | |
14 | tristate | |
15 | ||
16 | config HAVE_ARCH_BITREVERSE | |
17 | bool | |
18 | default n | |
19 | depends on BITREVERSE | |
20 | help | |
21 | This option enables the use of hardware bit-reversal instructions on | |
22 | architectures which support such operations. | |
23 | ||
24 | config RATIONAL | |
25 | bool | |
26 | ||
27 | config GENERIC_STRNCPY_FROM_USER | |
28 | bool | |
29 | ||
30 | config GENERIC_STRNLEN_USER | |
31 | bool | |
32 | ||
33 | config GENERIC_NET_UTILS | |
34 | bool | |
35 | ||
36 | config GENERIC_FIND_FIRST_BIT | |
37 | bool | |
38 | ||
39 | config NO_GENERIC_PCI_IOPORT_MAP | |
40 | bool | |
41 | ||
42 | config GENERIC_PCI_IOMAP | |
43 | bool | |
44 | ||
45 | config GENERIC_IOMAP | |
46 | bool | |
47 | select GENERIC_PCI_IOMAP | |
48 | ||
49 | config STMP_DEVICE | |
50 | bool | |
51 | ||
52 | config ARCH_USE_CMPXCHG_LOCKREF | |
53 | bool | |
54 | ||
55 | config ARCH_HAS_FAST_MULTIPLIER | |
56 | bool | |
57 | ||
58 | config INDIRECT_PIO | |
59 | bool "Access I/O in non-MMIO mode" | |
60 | depends on ARM64 | |
61 | help | |
62 | On some platforms where no separate I/O space exists, there are I/O | |
63 | hosts which can not be accessed in MMIO mode. Using the logical PIO | |
64 | mechanism, the host-local I/O resource can be mapped into system | |
65 | logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the | |
66 | system can access the I/O devices with the mapped-logic PIO through | |
67 | I/O accessors. | |
68 | ||
69 | This way has relatively little I/O performance cost. Please make | |
70 | sure your devices really need this configure item enabled. | |
71 | ||
72 | When in doubt, say N. | |
73 | ||
74 | config CRC_CCITT | |
75 | tristate "CRC-CCITT functions" | |
76 | help | |
77 | This option is provided for the case where no in-kernel-tree | |
78 | modules require CRC-CCITT functions, but a module built outside | |
79 | the kernel tree does. Such modules that use library CRC-CCITT | |
80 | functions require M here. | |
81 | ||
82 | config CRC16 | |
83 | tristate "CRC16 functions" | |
84 | help | |
85 | This option is provided for the case where no in-kernel-tree | |
86 | modules require CRC16 functions, but a module built outside | |
87 | the kernel tree does. Such modules that use library CRC16 | |
88 | functions require M here. | |
89 | ||
90 | config CRC_T10DIF | |
91 | tristate "CRC calculation for the T10 Data Integrity Field" | |
92 | select CRYPTO | |
93 | select CRYPTO_CRCT10DIF | |
94 | help | |
95 | This option is only needed if a module that's not in the | |
96 | kernel tree needs to calculate CRC checks for use with the | |
97 | SCSI data integrity subsystem. | |
98 | ||
99 | config CRC_ITU_T | |
100 | tristate "CRC ITU-T V.41 functions" | |
101 | help | |
102 | This option is provided for the case where no in-kernel-tree | |
103 | modules require CRC ITU-T V.41 functions, but a module built outside | |
104 | the kernel tree does. Such modules that use library CRC ITU-T V.41 | |
105 | functions require M here. | |
106 | ||
107 | config CRC32 | |
108 | tristate "CRC32/CRC32c functions" | |
109 | default y | |
110 | select BITREVERSE | |
111 | help | |
112 | This option is provided for the case where no in-kernel-tree | |
113 | modules require CRC32/CRC32c functions, but a module built outside | |
114 | the kernel tree does. Such modules that use library CRC32/CRC32c | |
115 | functions require M here. | |
116 | ||
117 | config CRC32_SELFTEST | |
118 | tristate "CRC32 perform self test on init" | |
119 | depends on CRC32 | |
120 | help | |
121 | This option enables the CRC32 library functions to perform a | |
122 | self test on initialization. The self test computes crc32_le | |
123 | and crc32_be over byte strings with random alignment and length | |
124 | and computes the total elapsed time and number of bytes processed. | |
125 | ||
126 | choice | |
127 | prompt "CRC32 implementation" | |
128 | depends on CRC32 | |
129 | default CRC32_SLICEBY8 | |
130 | help | |
131 | This option allows a kernel builder to override the default choice | |
132 | of CRC32 algorithm. Choose the default ("slice by 8") unless you | |
133 | know that you need one of the others. | |
134 | ||
135 | config CRC32_SLICEBY8 | |
136 | bool "Slice by 8 bytes" | |
137 | help | |
138 | Calculate checksum 8 bytes at a time with a clever slicing algorithm. | |
139 | This is the fastest algorithm, but comes with a 8KiB lookup table. | |
140 | Most modern processors have enough cache to hold this table without | |
141 | thrashing the cache. | |
142 | ||
143 | This is the default implementation choice. Choose this one unless | |
144 | you have a good reason not to. | |
145 | ||
146 | config CRC32_SLICEBY4 | |
147 | bool "Slice by 4 bytes" | |
148 | help | |
149 | Calculate checksum 4 bytes at a time with a clever slicing algorithm. | |
150 | This is a bit slower than slice by 8, but has a smaller 4KiB lookup | |
151 | table. | |
152 | ||
153 | Only choose this option if you know what you are doing. | |
154 | ||
155 | config CRC32_SARWATE | |
156 | bool "Sarwate's Algorithm (one byte at a time)" | |
157 | help | |
158 | Calculate checksum a byte at a time using Sarwate's algorithm. This | |
159 | is not particularly fast, but has a small 256 byte lookup table. | |
160 | ||
161 | Only choose this option if you know what you are doing. | |
162 | ||
163 | config CRC32_BIT | |
164 | bool "Classic Algorithm (one bit at a time)" | |
165 | help | |
166 | Calculate checksum one bit at a time. This is VERY slow, but has | |
167 | no lookup table. This is provided as a debugging option. | |
168 | ||
169 | Only choose this option if you are debugging crc32. | |
170 | ||
171 | endchoice | |
172 | ||
173 | config CRC4 | |
174 | tristate "CRC4 functions" | |
175 | help | |
176 | This option is provided for the case where no in-kernel-tree | |
177 | modules require CRC4 functions, but a module built outside | |
178 | the kernel tree does. Such modules that use library CRC4 | |
179 | functions require M here. | |
180 | ||
181 | config CRC7 | |
182 | tristate "CRC7 functions" | |
183 | help | |
184 | This option is provided for the case where no in-kernel-tree | |
185 | modules require CRC7 functions, but a module built outside | |
186 | the kernel tree does. Such modules that use library CRC7 | |
187 | functions require M here. | |
188 | ||
189 | config LIBCRC32C | |
190 | tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" | |
191 | select CRYPTO | |
192 | select CRYPTO_CRC32C | |
193 | help | |
194 | This option is provided for the case where no in-kernel-tree | |
195 | modules require CRC32c functions, but a module built outside the | |
196 | kernel tree does. Such modules that use library CRC32c functions | |
197 | require M here. See Castagnoli93. | |
198 | Module will be libcrc32c. | |
199 | ||
200 | config CRC8 | |
201 | tristate "CRC8 function" | |
202 | help | |
203 | This option provides CRC8 function. Drivers may select this | |
204 | when they need to do cyclic redundancy check according CRC8 | |
205 | algorithm. Module will be called crc8. | |
206 | ||
207 | config XXHASH | |
208 | tristate | |
209 | ||
210 | config AUDIT_GENERIC | |
211 | bool | |
212 | depends on AUDIT && !AUDIT_ARCH | |
213 | default y | |
214 | ||
215 | config AUDIT_ARCH_COMPAT_GENERIC | |
216 | bool | |
217 | default n | |
218 | ||
219 | config AUDIT_COMPAT_GENERIC | |
220 | bool | |
221 | depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT | |
222 | default y | |
223 | ||
224 | config RANDOM32_SELFTEST | |
225 | bool "PRNG perform self test on init" | |
226 | default n | |
227 | help | |
228 | This option enables the 32 bit PRNG library functions to perform a | |
229 | self test on initialization. | |
230 | ||
231 | # | |
232 | # compression support is select'ed if needed | |
233 | # | |
234 | config 842_COMPRESS | |
235 | select CRC32 | |
236 | tristate | |
237 | ||
238 | config 842_DECOMPRESS | |
239 | select CRC32 | |
240 | tristate | |
241 | ||
242 | config ZLIB_INFLATE | |
243 | tristate | |
244 | ||
245 | config ZLIB_DEFLATE | |
246 | tristate | |
247 | select BITREVERSE | |
248 | ||
249 | config LZO_COMPRESS | |
250 | tristate | |
251 | ||
252 | config LZO_DECOMPRESS | |
253 | tristate | |
254 | ||
255 | config LZ4_COMPRESS | |
256 | tristate | |
257 | ||
258 | config LZ4HC_COMPRESS | |
259 | tristate | |
260 | ||
261 | config LZ4_DECOMPRESS | |
262 | tristate | |
263 | ||
264 | config ZSTD_COMPRESS | |
265 | select XXHASH | |
266 | tristate | |
267 | ||
268 | config ZSTD_DECOMPRESS | |
269 | select XXHASH | |
270 | tristate | |
271 | ||
272 | source "lib/xz/Kconfig" | |
273 | ||
274 | # | |
275 | # These all provide a common interface (hence the apparent duplication with | |
276 | # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) | |
277 | # | |
278 | config DECOMPRESS_GZIP | |
279 | select ZLIB_INFLATE | |
280 | tristate | |
281 | ||
282 | config DECOMPRESS_BZIP2 | |
283 | tristate | |
284 | ||
285 | config DECOMPRESS_LZMA | |
286 | tristate | |
287 | ||
288 | config DECOMPRESS_XZ | |
289 | select XZ_DEC | |
290 | tristate | |
291 | ||
292 | config DECOMPRESS_LZO | |
293 | select LZO_DECOMPRESS | |
294 | tristate | |
295 | ||
296 | config DECOMPRESS_LZ4 | |
297 | select LZ4_DECOMPRESS | |
298 | tristate | |
299 | ||
300 | # | |
301 | # Generic allocator support is selected if needed | |
302 | # | |
303 | config GENERIC_ALLOCATOR | |
304 | bool | |
305 | ||
306 | # | |
307 | # reed solomon support is select'ed if needed | |
308 | # | |
309 | config REED_SOLOMON | |
310 | tristate | |
311 | ||
312 | config REED_SOLOMON_ENC8 | |
313 | bool | |
314 | ||
315 | config REED_SOLOMON_DEC8 | |
316 | bool | |
317 | ||
318 | config REED_SOLOMON_ENC16 | |
319 | bool | |
320 | ||
321 | config REED_SOLOMON_DEC16 | |
322 | bool | |
323 | ||
324 | # | |
325 | # BCH support is selected if needed | |
326 | # | |
327 | config BCH | |
328 | tristate | |
329 | ||
330 | config BCH_CONST_PARAMS | |
331 | bool | |
332 | help | |
333 | Drivers may select this option to force specific constant | |
334 | values for parameters 'm' (Galois field order) and 't' | |
335 | (error correction capability). Those specific values must | |
336 | be set by declaring default values for symbols BCH_CONST_M | |
337 | and BCH_CONST_T. | |
338 | Doing so will enable extra compiler optimizations, | |
339 | improving encoding and decoding performance up to 2x for | |
340 | usual (m,t) values (typically such that m*t < 200). | |
341 | When this option is selected, the BCH library supports | |
342 | only a single (m,t) configuration. This is mainly useful | |
343 | for NAND flash board drivers requiring known, fixed BCH | |
344 | parameters. | |
345 | ||
346 | config BCH_CONST_M | |
347 | int | |
348 | range 5 15 | |
349 | help | |
350 | Constant value for Galois field order 'm'. If 'k' is the | |
351 | number of data bits to protect, 'm' should be chosen such | |
352 | that (k + m*t) <= 2**m - 1. | |
353 | Drivers should declare a default value for this symbol if | |
354 | they select option BCH_CONST_PARAMS. | |
355 | ||
356 | config BCH_CONST_T | |
357 | int | |
358 | help | |
359 | Constant value for error correction capability in bits 't'. | |
360 | Drivers should declare a default value for this symbol if | |
361 | they select option BCH_CONST_PARAMS. | |
362 | ||
363 | # | |
364 | # Textsearch support is select'ed if needed | |
365 | # | |
366 | config TEXTSEARCH | |
367 | bool | |
368 | ||
369 | config TEXTSEARCH_KMP | |
370 | tristate | |
371 | ||
372 | config TEXTSEARCH_BM | |
373 | tristate | |
374 | ||
375 | config TEXTSEARCH_FSM | |
376 | tristate | |
377 | ||
378 | config BTREE | |
379 | bool | |
380 | ||
381 | config INTERVAL_TREE | |
382 | bool | |
383 | help | |
384 | Simple, embeddable, interval-tree. Can find the start of an | |
385 | overlapping range in log(n) time and then iterate over all | |
386 | overlapping nodes. The algorithm is implemented as an | |
387 | augmented rbtree. | |
388 | ||
389 | See: | |
390 | ||
391 | Documentation/rbtree.txt | |
392 | ||
393 | for more information. | |
394 | ||
395 | config RADIX_TREE_MULTIORDER | |
396 | bool | |
397 | ||
398 | config ASSOCIATIVE_ARRAY | |
399 | bool | |
400 | help | |
401 | Generic associative array. Can be searched and iterated over whilst | |
402 | it is being modified. It is also reasonably quick to search and | |
403 | modify. The algorithms are non-recursive, and the trees are highly | |
404 | capacious. | |
405 | ||
406 | See: | |
407 | ||
408 | Documentation/assoc_array.txt | |
409 | ||
410 | for more information. | |
411 | ||
412 | config HAS_IOMEM | |
413 | bool | |
414 | depends on !NO_IOMEM | |
415 | select GENERIC_IO | |
416 | default y | |
417 | ||
418 | config HAS_IOPORT_MAP | |
419 | bool | |
420 | depends on HAS_IOMEM && !NO_IOPORT_MAP | |
421 | default y | |
422 | ||
423 | config HAS_DMA | |
424 | bool | |
425 | depends on !NO_DMA | |
426 | default y | |
427 | ||
428 | config DMA_NOOP_OPS | |
429 | bool | |
430 | depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT) | |
431 | default n | |
432 | ||
433 | config DMA_VIRT_OPS | |
434 | bool | |
435 | depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT) | |
436 | default n | |
437 | ||
438 | config CHECK_SIGNATURE | |
439 | bool | |
440 | ||
441 | config CPUMASK_OFFSTACK | |
442 | bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS | |
443 | help | |
444 | Use dynamic allocation for cpumask_var_t, instead of putting | |
445 | them on the stack. This is a bit more expensive, but avoids | |
446 | stack overflow. | |
447 | ||
448 | config CPU_RMAP | |
449 | bool | |
450 | depends on SMP | |
451 | ||
452 | config DQL | |
453 | bool | |
454 | ||
455 | config GLOB | |
456 | bool | |
457 | # This actually supports modular compilation, but the module overhead | |
458 | # is ridiculous for the amount of code involved. Until an out-of-tree | |
459 | # driver asks for it, we'll just link it directly it into the kernel | |
460 | # when required. Since we're ignoring out-of-tree users, there's also | |
461 | # no need bother prompting for a manual decision: | |
462 | # prompt "glob_match() function" | |
463 | help | |
464 | This option provides a glob_match function for performing | |
465 | simple text pattern matching. It originated in the ATA code | |
466 | to blacklist particular drive models, but other device drivers | |
467 | may need similar functionality. | |
468 | ||
469 | All drivers in the Linux kernel tree that require this function | |
470 | should automatically select this option. Say N unless you | |
471 | are compiling an out-of tree driver which tells you that it | |
472 | depends on this. | |
473 | ||
474 | config GLOB_SELFTEST | |
475 | tristate "glob self-test on init" | |
476 | depends on GLOB | |
477 | help | |
478 | This option enables a simple self-test of the glob_match | |
479 | function on startup. It is primarily useful for people | |
480 | working on the code to ensure they haven't introduced any | |
481 | regressions. | |
482 | ||
483 | It only adds a little bit of code and slows kernel boot (or | |
484 | module load) by a small amount, so you're welcome to play with | |
485 | it, but you probably don't need it. | |
486 | ||
487 | # | |
488 | # Netlink attribute parsing support is select'ed if needed | |
489 | # | |
490 | config NLATTR | |
491 | bool | |
492 | ||
493 | # | |
494 | # Generic 64-bit atomic support is selected if needed | |
495 | # | |
496 | config GENERIC_ATOMIC64 | |
497 | bool | |
498 | ||
499 | config LRU_CACHE | |
500 | tristate | |
501 | ||
502 | config CLZ_TAB | |
503 | bool | |
504 | ||
505 | config CORDIC | |
506 | tristate "CORDIC algorithm" | |
507 | help | |
508 | This option provides an implementation of the CORDIC algorithm; | |
509 | calculations are in fixed point. Module will be called cordic. | |
510 | ||
511 | config DDR | |
512 | bool "JEDEC DDR data" | |
513 | help | |
514 | Data from JEDEC specs for DDR SDRAM memories, | |
515 | particularly the AC timing parameters and addressing | |
516 | information. This data is useful for drivers handling | |
517 | DDR SDRAM controllers. | |
518 | ||
519 | config IRQ_POLL | |
520 | bool "IRQ polling library" | |
521 | help | |
522 | Helper library to poll interrupt mitigation using polling. | |
523 | ||
524 | config MPILIB | |
525 | tristate | |
526 | select CLZ_TAB | |
527 | help | |
528 | Multiprecision maths library from GnuPG. | |
529 | It is used to implement RSA digital signature verification, | |
530 | which is used by IMA/EVM digital signature extension. | |
531 | ||
532 | config SIGNATURE | |
533 | tristate | |
534 | depends on KEYS | |
535 | select CRYPTO | |
536 | select CRYPTO_SHA1 | |
537 | select MPILIB | |
538 | help | |
539 | Digital signature verification. Currently only RSA is supported. | |
540 | Implementation is done using GnuPG MPI library | |
541 | ||
542 | # | |
543 | # libfdt files, only selected if needed. | |
544 | # | |
545 | config LIBFDT | |
546 | bool | |
547 | ||
548 | config OID_REGISTRY | |
549 | tristate | |
550 | help | |
551 | Enable fast lookup object identifier registry. | |
552 | ||
553 | config UCS2_STRING | |
554 | tristate | |
555 | ||
556 | source "lib/fonts/Kconfig" | |
557 | ||
558 | config SG_SPLIT | |
559 | def_bool n | |
560 | help | |
561 | Provides a helper to split scatterlists into chunks, each chunk being | |
562 | a scatterlist. This should be selected by a driver or an API which | |
563 | whishes to split a scatterlist amongst multiple DMA channels. | |
564 | ||
565 | config SG_POOL | |
566 | def_bool n | |
567 | help | |
568 | Provides a helper to allocate chained scatterlists. This should be | |
569 | selected by a driver or an API which whishes to allocate chained | |
570 | scatterlist. | |
571 | ||
572 | # | |
573 | # sg chaining option | |
574 | # | |
575 | ||
576 | config ARCH_HAS_SG_CHAIN | |
577 | def_bool n | |
578 | ||
579 | config ARCH_HAS_PMEM_API | |
580 | bool | |
581 | ||
582 | config ARCH_HAS_UACCESS_FLUSHCACHE | |
583 | bool | |
584 | ||
585 | config STACKDEPOT | |
586 | bool | |
587 | select STACKTRACE | |
588 | ||
589 | config SBITMAP | |
590 | bool | |
591 | ||
592 | config PARMAN | |
593 | tristate "parman" if COMPILE_TEST | |
594 | ||
595 | config PRIME_NUMBERS | |
596 | tristate | |
597 | ||
598 | config STRING_SELFTEST | |
599 | tristate "Test string functions" | |
600 | ||
601 | endmenu | |
602 | ||
603 | config GENERIC_ASHLDI3 | |
604 | bool | |
605 | ||
606 | config GENERIC_ASHRDI3 | |
607 | bool | |
608 | ||
609 | config GENERIC_LSHRDI3 | |
610 | bool | |
611 | ||
612 | config GENERIC_MULDI3 | |
613 | bool | |
614 | ||
615 | config GENERIC_CMPDI2 | |
616 | bool | |
617 | ||
618 | config GENERIC_UCMPDI2 | |
619 | bool |