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Linux/lib/Kconfig

  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 GENERIC_IO
 50         bool
 51         default n
 52 
 53 config STMP_DEVICE
 54         bool
 55 
 56 config ARCH_USE_CMPXCHG_LOCKREF
 57         bool
 58 
 59 config ARCH_HAS_FAST_MULTIPLIER
 60         bool
 61 
 62 config CRC_CCITT
 63         tristate "CRC-CCITT functions"
 64         help
 65           This option is provided for the case where no in-kernel-tree
 66           modules require CRC-CCITT functions, but a module built outside
 67           the kernel tree does. Such modules that use library CRC-CCITT
 68           functions require M here.
 69 
 70 config CRC16
 71         tristate "CRC16 functions"
 72         help
 73           This option is provided for the case where no in-kernel-tree
 74           modules require CRC16 functions, but a module built outside
 75           the kernel tree does. Such modules that use library CRC16
 76           functions require M here.
 77 
 78 config CRC_T10DIF
 79         tristate "CRC calculation for the T10 Data Integrity Field"
 80         select CRYPTO
 81         select CRYPTO_CRCT10DIF
 82         help
 83           This option is only needed if a module that's not in the
 84           kernel tree needs to calculate CRC checks for use with the
 85           SCSI data integrity subsystem.
 86 
 87 config CRC_ITU_T
 88         tristate "CRC ITU-T V.41 functions"
 89         help
 90           This option is provided for the case where no in-kernel-tree
 91           modules require CRC ITU-T V.41 functions, but a module built outside
 92           the kernel tree does. Such modules that use library CRC ITU-T V.41
 93           functions require M here.
 94 
 95 config CRC32
 96         tristate "CRC32/CRC32c functions"
 97         default y
 98         select BITREVERSE
 99         help
100           This option is provided for the case where no in-kernel-tree
101           modules require CRC32/CRC32c functions, but a module built outside
102           the kernel tree does. Such modules that use library CRC32/CRC32c
103           functions require M here.
104 
105 config CRC32_SELFTEST
106         bool "CRC32 perform self test on init"
107         default n
108         depends on CRC32
109         help
110           This option enables the CRC32 library functions to perform a
111           self test on initialization. The self test computes crc32_le
112           and crc32_be over byte strings with random alignment and length
113           and computes the total elapsed time and number of bytes processed.
114 
115 choice
116         prompt "CRC32 implementation"
117         depends on CRC32
118         default CRC32_SLICEBY8
119         help
120           This option allows a kernel builder to override the default choice
121           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
122           know that you need one of the others.
123 
124 config CRC32_SLICEBY8
125         bool "Slice by 8 bytes"
126         help
127           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
128           This is the fastest algorithm, but comes with a 8KiB lookup table.
129           Most modern processors have enough cache to hold this table without
130           thrashing the cache.
131 
132           This is the default implementation choice.  Choose this one unless
133           you have a good reason not to.
134 
135 config CRC32_SLICEBY4
136         bool "Slice by 4 bytes"
137         help
138           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
139           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
140           table.
141 
142           Only choose this option if you know what you are doing.
143 
144 config CRC32_SARWATE
145         bool "Sarwate's Algorithm (one byte at a time)"
146         help
147           Calculate checksum a byte at a time using Sarwate's algorithm.  This
148           is not particularly fast, but has a small 256 byte lookup table.
149 
150           Only choose this option if you know what you are doing.
151 
152 config CRC32_BIT
153         bool "Classic Algorithm (one bit at a time)"
154         help
155           Calculate checksum one bit at a time.  This is VERY slow, but has
156           no lookup table.  This is provided as a debugging option.
157 
158           Only choose this option if you are debugging crc32.
159 
160 endchoice
161 
162 config CRC7
163         tristate "CRC7 functions"
164         help
165           This option is provided for the case where no in-kernel-tree
166           modules require CRC7 functions, but a module built outside
167           the kernel tree does. Such modules that use library CRC7
168           functions require M here.
169 
170 config LIBCRC32C
171         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
172         select CRYPTO
173         select CRYPTO_CRC32C
174         help
175           This option is provided for the case where no in-kernel-tree
176           modules require CRC32c functions, but a module built outside the
177           kernel tree does. Such modules that use library CRC32c functions
178           require M here.  See Castagnoli93.
179           Module will be libcrc32c.
180 
181 config CRC8
182         tristate "CRC8 function"
183         help
184           This option provides CRC8 function. Drivers may select this
185           when they need to do cyclic redundancy check according CRC8
186           algorithm. Module will be called crc8.
187 
188 config AUDIT_GENERIC
189         bool
190         depends on AUDIT && !AUDIT_ARCH
191         default y
192 
193 config AUDIT_ARCH_COMPAT_GENERIC
194         bool
195         default n
196 
197 config AUDIT_COMPAT_GENERIC
198         bool
199         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
200         default y
201 
202 config RANDOM32_SELFTEST
203         bool "PRNG perform self test on init"
204         default n
205         help
206           This option enables the 32 bit PRNG library functions to perform a
207           self test on initialization.
208 
209 #
210 # compression support is select'ed if needed
211 #
212 config 842_COMPRESS
213         select CRC32
214         tristate
215 
216 config 842_DECOMPRESS
217         select CRC32
218         tristate
219 
220 config ZLIB_INFLATE
221         tristate
222 
223 config ZLIB_DEFLATE
224         tristate
225         select BITREVERSE
226 
227 config LZO_COMPRESS
228         tristate
229 
230 config LZO_DECOMPRESS
231         tristate
232 
233 config LZ4_COMPRESS
234         tristate
235 
236 config LZ4HC_COMPRESS
237         tristate
238 
239 config LZ4_DECOMPRESS
240         tristate
241 
242 source "lib/xz/Kconfig"
243 
244 #
245 # These all provide a common interface (hence the apparent duplication with
246 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
247 #
248 config DECOMPRESS_GZIP
249         select ZLIB_INFLATE
250         tristate
251 
252 config DECOMPRESS_BZIP2
253         tristate
254 
255 config DECOMPRESS_LZMA
256         tristate
257 
258 config DECOMPRESS_XZ
259         select XZ_DEC
260         tristate
261 
262 config DECOMPRESS_LZO
263         select LZO_DECOMPRESS
264         tristate
265 
266 config DECOMPRESS_LZ4
267         select LZ4_DECOMPRESS
268         tristate
269 
270 #
271 # Generic allocator support is selected if needed
272 #
273 config GENERIC_ALLOCATOR
274         bool
275 
276 #
277 # reed solomon support is select'ed if needed
278 #
279 config REED_SOLOMON
280         tristate
281         
282 config REED_SOLOMON_ENC8
283         bool
284 
285 config REED_SOLOMON_DEC8
286         bool
287 
288 config REED_SOLOMON_ENC16
289         bool
290 
291 config REED_SOLOMON_DEC16
292         bool
293 
294 #
295 # BCH support is selected if needed
296 #
297 config BCH
298         tristate
299 
300 config BCH_CONST_PARAMS
301         bool
302         help
303           Drivers may select this option to force specific constant
304           values for parameters 'm' (Galois field order) and 't'
305           (error correction capability). Those specific values must
306           be set by declaring default values for symbols BCH_CONST_M
307           and BCH_CONST_T.
308           Doing so will enable extra compiler optimizations,
309           improving encoding and decoding performance up to 2x for
310           usual (m,t) values (typically such that m*t < 200).
311           When this option is selected, the BCH library supports
312           only a single (m,t) configuration. This is mainly useful
313           for NAND flash board drivers requiring known, fixed BCH
314           parameters.
315 
316 config BCH_CONST_M
317         int
318         range 5 15
319         help
320           Constant value for Galois field order 'm'. If 'k' is the
321           number of data bits to protect, 'm' should be chosen such
322           that (k + m*t) <= 2**m - 1.
323           Drivers should declare a default value for this symbol if
324           they select option BCH_CONST_PARAMS.
325 
326 config BCH_CONST_T
327         int
328         help
329           Constant value for error correction capability in bits 't'.
330           Drivers should declare a default value for this symbol if
331           they select option BCH_CONST_PARAMS.
332 
333 #
334 # Textsearch support is select'ed if needed
335 #
336 config TEXTSEARCH
337         bool
338 
339 config TEXTSEARCH_KMP
340         tristate
341 
342 config TEXTSEARCH_BM
343         tristate
344 
345 config TEXTSEARCH_FSM
346         tristate
347 
348 config BTREE
349         bool
350 
351 config INTERVAL_TREE
352         bool
353         help
354           Simple, embeddable, interval-tree. Can find the start of an
355           overlapping range in log(n) time and then iterate over all
356           overlapping nodes. The algorithm is implemented as an
357           augmented rbtree.
358 
359           See:
360 
361                 Documentation/rbtree.txt
362 
363           for more information.
364 
365 config RADIX_TREE_MULTIORDER
366         bool
367 
368 config ASSOCIATIVE_ARRAY
369         bool
370         help
371           Generic associative array.  Can be searched and iterated over whilst
372           it is being modified.  It is also reasonably quick to search and
373           modify.  The algorithms are non-recursive, and the trees are highly
374           capacious.
375 
376           See:
377 
378                 Documentation/assoc_array.txt
379 
380           for more information.
381 
382 config HAS_IOMEM
383         bool
384         depends on !NO_IOMEM
385         select GENERIC_IO
386         default y
387 
388 config HAS_IOPORT_MAP
389         bool
390         depends on HAS_IOMEM && !NO_IOPORT_MAP
391         default y
392 
393 config HAS_DMA
394         bool
395         depends on !NO_DMA
396         default y
397 
398 config CHECK_SIGNATURE
399         bool
400 
401 config CPUMASK_OFFSTACK
402         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
403         help
404           Use dynamic allocation for cpumask_var_t, instead of putting
405           them on the stack.  This is a bit more expensive, but avoids
406           stack overflow.
407 
408 config CPU_RMAP
409         bool
410         depends on SMP
411 
412 config DQL
413         bool
414 
415 config GLOB
416         bool
417 #       This actually supports modular compilation, but the module overhead
418 #       is ridiculous for the amount of code involved.  Until an out-of-tree
419 #       driver asks for it, we'll just link it directly it into the kernel
420 #       when required.  Since we're ignoring out-of-tree users, there's also
421 #       no need bother prompting for a manual decision:
422 #       prompt "glob_match() function"
423         help
424           This option provides a glob_match function for performing
425           simple text pattern matching.  It originated in the ATA code
426           to blacklist particular drive models, but other device drivers
427           may need similar functionality.
428 
429           All drivers in the Linux kernel tree that require this function
430           should automatically select this option.  Say N unless you
431           are compiling an out-of tree driver which tells you that it
432           depends on this.
433 
434 config GLOB_SELFTEST
435         bool "glob self-test on init"
436         default n
437         depends on GLOB
438         help
439           This option enables a simple self-test of the glob_match
440           function on startup.  It is primarily useful for people
441           working on the code to ensure they haven't introduced any
442           regressions.
443 
444           It only adds a little bit of code and slows kernel boot (or
445           module load) by a small amount, so you're welcome to play with
446           it, but you probably don't need it.
447 
448 #
449 # Netlink attribute parsing support is select'ed if needed
450 #
451 config NLATTR
452         bool
453 
454 #
455 # Generic 64-bit atomic support is selected if needed
456 #
457 config GENERIC_ATOMIC64
458        bool
459 
460 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
461         def_bool y if GENERIC_ATOMIC64
462 
463 config LRU_CACHE
464         tristate
465 
466 config CLZ_TAB
467         bool
468 
469 config CORDIC
470         tristate "CORDIC algorithm"
471         help
472           This option provides an implementation of the CORDIC algorithm;
473           calculations are in fixed point. Module will be called cordic.
474 
475 config DDR
476         bool "JEDEC DDR data"
477         help
478           Data from JEDEC specs for DDR SDRAM memories,
479           particularly the AC timing parameters and addressing
480           information. This data is useful for drivers handling
481           DDR SDRAM controllers.
482 
483 config IRQ_POLL
484         bool "IRQ polling library"
485         help
486           Helper library to poll interrupt mitigation using polling.
487 
488 config MPILIB
489         tristate
490         select CLZ_TAB
491         help
492           Multiprecision maths library from GnuPG.
493           It is used to implement RSA digital signature verification,
494           which is used by IMA/EVM digital signature extension.
495 
496 config SIGNATURE
497         tristate
498         depends on KEYS
499         select CRYPTO
500         select CRYPTO_SHA1
501         select MPILIB
502         help
503           Digital signature verification. Currently only RSA is supported.
504           Implementation is done using GnuPG MPI library
505 
506 #
507 # libfdt files, only selected if needed.
508 #
509 config LIBFDT
510         bool
511 
512 config OID_REGISTRY
513         tristate
514         help
515           Enable fast lookup object identifier registry.
516 
517 config UCS2_STRING
518         tristate
519 
520 source "lib/fonts/Kconfig"
521 
522 config SG_SPLIT
523         def_bool n
524         help
525          Provides a helper to split scatterlists into chunks, each chunk being
526          a scatterlist. This should be selected by a driver or an API which
527          whishes to split a scatterlist amongst multiple DMA channels.
528 
529 config SG_POOL
530         def_bool n
531         help
532          Provides a helper to allocate chained scatterlists. This should be
533          selected by a driver or an API which whishes to allocate chained
534          scatterlist.
535 
536 #
537 # sg chaining option
538 #
539 
540 config ARCH_HAS_SG_CHAIN
541         def_bool n
542 
543 config ARCH_HAS_PMEM_API
544         bool
545 
546 config ARCH_HAS_MMIO_FLUSH
547         bool
548 
549 config STACKDEPOT
550         bool
551         select STACKTRACE
552 
553 endmenu

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