Root/lib/Kconfig

Source at commit fbf123cd4cc0c097fe9a99c90109ebb2a5e94a50 created 10 years 3 months ago.
By Lars-Peter Clausen, dma: jz4740: Dequeue descriptor from active list before completing it
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 AUDIT_ARCH_COMPAT_GENERIC
186    bool
187    default n
188
189config AUDIT_COMPAT_GENERIC
190    bool
191    depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
192    default y
193
194config RANDOM32_SELFTEST
195    bool "PRNG perform self test on init"
196    default n
197    help
198      This option enables the 32 bit PRNG library functions to perform a
199      self test on initialization.
200
201#
202# compression support is select'ed if needed
203#
204config ZLIB_INFLATE
205    tristate
206
207config ZLIB_DEFLATE
208    tristate
209
210config LZO_COMPRESS
211    tristate
212
213config LZO_DECOMPRESS
214    tristate
215
216config LZ4_COMPRESS
217    tristate
218
219config LZ4HC_COMPRESS
220    tristate
221
222config LZ4_DECOMPRESS
223    tristate
224
225source "lib/xz/Kconfig"
226
227#
228# These all provide a common interface (hence the apparent duplication with
229# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
230#
231config DECOMPRESS_GZIP
232    select ZLIB_INFLATE
233    tristate
234
235config DECOMPRESS_BZIP2
236    tristate
237
238config DECOMPRESS_LZMA
239    tristate
240
241config DECOMPRESS_XZ
242    select XZ_DEC
243    tristate
244
245config DECOMPRESS_LZO
246    select LZO_DECOMPRESS
247    tristate
248
249config DECOMPRESS_LZ4
250    select LZ4_DECOMPRESS
251    tristate
252
253#
254# Generic allocator support is selected if needed
255#
256config GENERIC_ALLOCATOR
257    boolean
258
259#
260# reed solomon support is select'ed if needed
261#
262config REED_SOLOMON
263    tristate
264    
265config REED_SOLOMON_ENC8
266    boolean
267
268config REED_SOLOMON_DEC8
269    boolean
270
271config REED_SOLOMON_ENC16
272    boolean
273
274config REED_SOLOMON_DEC16
275    boolean
276
277#
278# BCH support is selected if needed
279#
280config BCH
281    tristate
282
283config BCH_CONST_PARAMS
284    boolean
285    help
286      Drivers may select this option to force specific constant
287      values for parameters 'm' (Galois field order) and 't'
288      (error correction capability). Those specific values must
289      be set by declaring default values for symbols BCH_CONST_M
290      and BCH_CONST_T.
291      Doing so will enable extra compiler optimizations,
292      improving encoding and decoding performance up to 2x for
293      usual (m,t) values (typically such that m*t < 200).
294      When this option is selected, the BCH library supports
295      only a single (m,t) configuration. This is mainly useful
296      for NAND flash board drivers requiring known, fixed BCH
297      parameters.
298
299config BCH_CONST_M
300    int
301    range 5 15
302    help
303      Constant value for Galois field order 'm'. If 'k' is the
304      number of data bits to protect, 'm' should be chosen such
305      that (k + m*t) <= 2**m - 1.
306      Drivers should declare a default value for this symbol if
307      they select option BCH_CONST_PARAMS.
308
309config BCH_CONST_T
310    int
311    help
312      Constant value for error correction capability in bits 't'.
313      Drivers should declare a default value for this symbol if
314      they select option BCH_CONST_PARAMS.
315
316#
317# Textsearch support is select'ed if needed
318#
319config TEXTSEARCH
320    boolean
321
322config TEXTSEARCH_KMP
323    tristate
324
325config TEXTSEARCH_BM
326    tristate
327
328config TEXTSEARCH_FSM
329    tristate
330
331config BTREE
332    boolean
333
334config INTERVAL_TREE
335    boolean
336    help
337      Simple, embeddable, interval-tree. Can find the start of an
338      overlapping range in log(n) time and then iterate over all
339      overlapping nodes. The algorithm is implemented as an
340      augmented rbtree.
341
342      See:
343
344        Documentation/rbtree.txt
345
346      for more information.
347
348config ASSOCIATIVE_ARRAY
349    bool
350    help
351      Generic associative array. Can be searched and iterated over whilst
352      it is being modified. It is also reasonably quick to search and
353      modify. The algorithms are non-recursive, and the trees are highly
354      capacious.
355
356      See:
357
358        Documentation/assoc_array.txt
359
360      for more information.
361
362config HAS_IOMEM
363    boolean
364    depends on !NO_IOMEM
365    select GENERIC_IO
366    default y
367
368config HAS_IOPORT_MAP
369    boolean
370    depends on HAS_IOMEM && !NO_IOPORT_MAP
371    default y
372
373config HAS_DMA
374    boolean
375    depends on !NO_DMA
376    default y
377
378config CHECK_SIGNATURE
379    bool
380
381config CPUMASK_OFFSTACK
382    bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
383    help
384      Use dynamic allocation for cpumask_var_t, instead of putting
385      them on the stack. This is a bit more expensive, but avoids
386      stack overflow.
387
388config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
389       bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
390       depends on BROKEN
391
392config CPU_RMAP
393    bool
394    depends on SMP
395
396config DQL
397    bool
398
399#
400# Netlink attribute parsing support is select'ed if needed
401#
402config NLATTR
403    bool
404
405#
406# Generic 64-bit atomic support is selected if needed
407#
408config GENERIC_ATOMIC64
409       bool
410
411config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
412    def_bool y if GENERIC_ATOMIC64
413
414config LRU_CACHE
415    tristate
416
417config AVERAGE
418    bool "Averaging functions"
419    help
420      This option is provided for the case where no in-kernel-tree
421      modules require averaging functions, but a module built outside
422      the kernel tree does. Such modules that use library averaging
423      functions require Y here.
424
425      If unsure, say N.
426
427config CLZ_TAB
428    bool
429
430config CORDIC
431    tristate "CORDIC algorithm"
432    help
433      This option provides an implementation of the CORDIC algorithm;
434      calculations are in fixed point. Module will be called cordic.
435
436config DDR
437    bool "JEDEC DDR data"
438    help
439      Data from JEDEC specs for DDR SDRAM memories,
440      particularly the AC timing parameters and addressing
441      information. This data is useful for drivers handling
442      DDR SDRAM controllers.
443
444config MPILIB
445    tristate
446    select CLZ_TAB
447    help
448      Multiprecision maths library from GnuPG.
449      It is used to implement RSA digital signature verification,
450      which is used by IMA/EVM digital signature extension.
451
452config SIGNATURE
453    tristate
454    depends on KEYS && CRYPTO
455    select CRYPTO_SHA1
456    select MPILIB
457    help
458      Digital signature verification. Currently only RSA is supported.
459      Implementation is done using GnuPG MPI library
460
461#
462# libfdt files, only selected if needed.
463#
464config LIBFDT
465    bool
466
467config OID_REGISTRY
468    tristate
469    help
470      Enable fast lookup object identifier registry.
471
472config UCS2_STRING
473        tristate
474
475source "lib/fonts/Kconfig"
476
477endmenu
478

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