Root/lib/Kconfig

1#
2# Library configuration
3#
4
5config BINARY_PRINTF
6    def_bool n
7
8menu "Library routines"
9
10config RAID6_PQ
11    tristate
12
13config BITREVERSE
14    tristate
15
16config RATIONAL
17    boolean
18
19config GENERIC_STRNCPY_FROM_USER
20    bool
21
22config GENERIC_STRNLEN_USER
23    bool
24
25config GENERIC_NET_UTILS
26    bool
27
28config GENERIC_FIND_FIRST_BIT
29    bool
30
31config NO_GENERIC_PCI_IOPORT_MAP
32    bool
33
34config GENERIC_PCI_IOMAP
35    bool
36
37config GENERIC_IOMAP
38    bool
39    select GENERIC_PCI_IOMAP
40
41config GENERIC_IO
42    boolean
43    default n
44
45config STMP_DEVICE
46    bool
47
48config PERCPU_RWSEM
49    boolean
50
51config ARCH_USE_CMPXCHG_LOCKREF
52    bool
53
54config CRC_CCITT
55    tristate "CRC-CCITT functions"
56    help
57      This option is provided for the case where no in-kernel-tree
58      modules require CRC-CCITT functions, but a module built outside
59      the kernel tree does. Such modules that use library CRC-CCITT
60      functions require M here.
61
62config CRC16
63    tristate "CRC16 functions"
64    help
65      This option is provided for the case where no in-kernel-tree
66      modules require CRC16 functions, but a module built outside
67      the kernel tree does. Such modules that use library CRC16
68      functions require M here.
69
70config CRC_T10DIF
71    tristate "CRC calculation for the T10 Data Integrity Field"
72    select CRYPTO
73    select CRYPTO_CRCT10DIF
74    help
75      This option is only needed if a module that's not in the
76      kernel tree needs to calculate CRC checks for use with the
77      SCSI data integrity subsystem.
78
79config CRC_ITU_T
80    tristate "CRC ITU-T V.41 functions"
81    help
82      This option is provided for the case where no in-kernel-tree
83      modules require CRC ITU-T V.41 functions, but a module built outside
84      the kernel tree does. Such modules that use library CRC ITU-T V.41
85      functions require M here.
86
87config CRC32
88    tristate "CRC32/CRC32c functions"
89    default y
90    select BITREVERSE
91    help
92      This option is provided for the case where no in-kernel-tree
93      modules require CRC32/CRC32c functions, but a module built outside
94      the kernel tree does. Such modules that use library CRC32/CRC32c
95      functions require M here.
96
97config CRC32_SELFTEST
98    bool "CRC32 perform self test on init"
99    default n
100    depends on CRC32
101    help
102      This option enables the CRC32 library functions to perform a
103      self test on initialization. The self test computes crc32_le
104      and crc32_be over byte strings with random alignment and length
105      and computes the total elapsed time and number of bytes processed.
106
107choice
108    prompt "CRC32 implementation"
109    depends on CRC32
110    default CRC32_SLICEBY8
111    help
112      This option allows a kernel builder to override the default choice
113      of CRC32 algorithm. Choose the default ("slice by 8") unless you
114      know that you need one of the others.
115
116config CRC32_SLICEBY8
117    bool "Slice by 8 bytes"
118    help
119      Calculate checksum 8 bytes at a time with a clever slicing algorithm.
120      This is the fastest algorithm, but comes with a 8KiB lookup table.
121      Most modern processors have enough cache to hold this table without
122      thrashing the cache.
123
124      This is the default implementation choice. Choose this one unless
125      you have a good reason not to.
126
127config CRC32_SLICEBY4
128    bool "Slice by 4 bytes"
129    help
130      Calculate checksum 4 bytes at a time with a clever slicing algorithm.
131      This is a bit slower than slice by 8, but has a smaller 4KiB lookup
132      table.
133
134      Only choose this option if you know what you are doing.
135
136config CRC32_SARWATE
137    bool "Sarwate's Algorithm (one byte at a time)"
138    help
139      Calculate checksum a byte at a time using Sarwate's algorithm. This
140      is not particularly fast, but has a small 256 byte lookup table.
141
142      Only choose this option if you know what you are doing.
143
144config CRC32_BIT
145    bool "Classic Algorithm (one bit at a time)"
146    help
147      Calculate checksum one bit at a time. This is VERY slow, but has
148      no lookup table. This is provided as a debugging option.
149
150      Only choose this option if you are debugging crc32.
151
152endchoice
153
154config CRC7
155    tristate "CRC7 functions"
156    help
157      This option is provided for the case where no in-kernel-tree
158      modules require CRC7 functions, but a module built outside
159      the kernel tree does. Such modules that use library CRC7
160      functions require M here.
161
162config LIBCRC32C
163    tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
164    select CRYPTO
165    select CRYPTO_CRC32C
166    help
167      This option is provided for the case where no in-kernel-tree
168      modules require CRC32c functions, but a module built outside the
169      kernel tree does. Such modules that use library CRC32c functions
170      require M here. See Castagnoli93.
171      Module will be libcrc32c.
172
173config CRC8
174    tristate "CRC8 function"
175    help
176      This option provides CRC8 function. Drivers may select this
177      when they need to do cyclic redundancy check according CRC8
178      algorithm. Module will be called crc8.
179
180config AUDIT_GENERIC
181    bool
182    depends on AUDIT && !AUDIT_ARCH
183    default y
184
185config RANDOM32_SELFTEST
186    bool "PRNG perform self test on init"
187    default n
188    help
189      This option enables the 32 bit PRNG library functions to perform a
190      self test on initialization.
191
192#
193# compression support is select'ed if needed
194#
195config ZLIB_INFLATE
196    tristate
197
198config ZLIB_DEFLATE
199    tristate
200
201config LZO_COMPRESS
202    tristate
203
204config LZO_DECOMPRESS
205    tristate
206
207config LZ4_COMPRESS
208    tristate
209
210config LZ4HC_COMPRESS
211    tristate
212
213config LZ4_DECOMPRESS
214    tristate
215
216source "lib/xz/Kconfig"
217
218#
219# These all provide a common interface (hence the apparent duplication with
220# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
221#
222config DECOMPRESS_GZIP
223    select ZLIB_INFLATE
224    tristate
225
226config DECOMPRESS_BZIP2
227    tristate
228
229config DECOMPRESS_LZMA
230    tristate
231
232config DECOMPRESS_XZ
233    select XZ_DEC
234    tristate
235
236config DECOMPRESS_LZO
237    select LZO_DECOMPRESS
238    tristate
239
240config DECOMPRESS_LZ4
241    select LZ4_DECOMPRESS
242    tristate
243
244#
245# Generic allocator support is selected if needed
246#
247config GENERIC_ALLOCATOR
248    boolean
249
250#
251# reed solomon support is select'ed if needed
252#
253config REED_SOLOMON
254    tristate
255    
256config REED_SOLOMON_ENC8
257    boolean
258
259config REED_SOLOMON_DEC8
260    boolean
261
262config REED_SOLOMON_ENC16
263    boolean
264
265config REED_SOLOMON_DEC16
266    boolean
267
268#
269# BCH support is selected if needed
270#
271config BCH
272    tristate
273
274config BCH_CONST_PARAMS
275    boolean
276    help
277      Drivers may select this option to force specific constant
278      values for parameters 'm' (Galois field order) and 't'
279      (error correction capability). Those specific values must
280      be set by declaring default values for symbols BCH_CONST_M
281      and BCH_CONST_T.
282      Doing so will enable extra compiler optimizations,
283      improving encoding and decoding performance up to 2x for
284      usual (m,t) values (typically such that m*t < 200).
285      When this option is selected, the BCH library supports
286      only a single (m,t) configuration. This is mainly useful
287      for NAND flash board drivers requiring known, fixed BCH
288      parameters.
289
290config BCH_CONST_M
291    int
292    range 5 15
293    help
294      Constant value for Galois field order 'm'. If 'k' is the
295      number of data bits to protect, 'm' should be chosen such
296      that (k + m*t) <= 2**m - 1.
297      Drivers should declare a default value for this symbol if
298      they select option BCH_CONST_PARAMS.
299
300config BCH_CONST_T
301    int
302    help
303      Constant value for error correction capability in bits 't'.
304      Drivers should declare a default value for this symbol if
305      they select option BCH_CONST_PARAMS.
306
307#
308# Textsearch support is select'ed if needed
309#
310config TEXTSEARCH
311    boolean
312
313config TEXTSEARCH_KMP
314    tristate
315
316config TEXTSEARCH_BM
317    tristate
318
319config TEXTSEARCH_FSM
320    tristate
321
322config BTREE
323    boolean
324
325config ASSOCIATIVE_ARRAY
326    bool
327    help
328      Generic associative array. Can be searched and iterated over whilst
329      it is being modified. It is also reasonably quick to search and
330      modify. The algorithms are non-recursive, and the trees are highly
331      capacious.
332
333      See:
334
335        Documentation/assoc_array.txt
336
337      for more information.
338
339config HAS_IOMEM
340    boolean
341    depends on !NO_IOMEM
342    select GENERIC_IO
343    default y
344
345config HAS_IOPORT
346    boolean
347    depends on HAS_IOMEM && !NO_IOPORT
348    default y
349
350config HAS_DMA
351    boolean
352    depends on !NO_DMA
353    default y
354
355config CHECK_SIGNATURE
356    bool
357
358config CPUMASK_OFFSTACK
359    bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
360    help
361      Use dynamic allocation for cpumask_var_t, instead of putting
362      them on the stack. This is a bit more expensive, but avoids
363      stack overflow.
364
365config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
366       bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
367       depends on BROKEN
368
369config CPU_RMAP
370    bool
371    depends on SMP
372
373config DQL
374    bool
375
376#
377# Netlink attribute parsing support is select'ed if needed
378#
379config NLATTR
380    bool
381
382#
383# Generic 64-bit atomic support is selected if needed
384#
385config GENERIC_ATOMIC64
386       bool
387
388config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
389    def_bool y if GENERIC_ATOMIC64
390
391config LRU_CACHE
392    tristate
393
394config AVERAGE
395    bool "Averaging functions"
396    help
397      This option is provided for the case where no in-kernel-tree
398      modules require averaging functions, but a module built outside
399      the kernel tree does. Such modules that use library averaging
400      functions require Y here.
401
402      If unsure, say N.
403
404config CLZ_TAB
405    bool
406
407config CORDIC
408    tristate "CORDIC algorithm"
409    help
410      This option provides an implementation of the CORDIC algorithm;
411      calculations are in fixed point. Module will be called cordic.
412
413config DDR
414    bool "JEDEC DDR data"
415    help
416      Data from JEDEC specs for DDR SDRAM memories,
417      particularly the AC timing parameters and addressing
418      information. This data is useful for drivers handling
419      DDR SDRAM controllers.
420
421config MPILIB
422    tristate
423    select CLZ_TAB
424    help
425      Multiprecision maths library from GnuPG.
426      It is used to implement RSA digital signature verification,
427      which is used by IMA/EVM digital signature extension.
428
429config SIGNATURE
430    tristate
431    depends on KEYS && CRYPTO
432    select CRYPTO_SHA1
433    select MPILIB
434    help
435      Digital signature verification. Currently only RSA is supported.
436      Implementation is done using GnuPG MPI library
437
438#
439# libfdt files, only selected if needed.
440#
441config LIBFDT
442    bool
443
444config OID_REGISTRY
445    tristate
446    help
447      Enable fast lookup object identifier registry.
448
449config UCS2_STRING
450        tristate
451
452source "lib/fonts/Kconfig"
453
454endmenu
455

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