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

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