Root/lib/Kconfig

Source at commit 2604e7f9a98c27be50a0c3ff7503b6a5ea8f6cfe created 12 years 7 months ago.
By Maarten ter Huurne, cpufreq_stats: Support runtime changes to frequency table
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 CRC_CCITT
46    tristate "CRC-CCITT functions"
47    help
48      This option is provided for the case where no in-kernel-tree
49      modules require CRC-CCITT functions, but a module built outside
50      the kernel tree does. Such modules that use library CRC-CCITT
51      functions require M here.
52
53config CRC16
54    tristate "CRC16 functions"
55    help
56      This option is provided for the case where no in-kernel-tree
57      modules require CRC16 functions, but a module built outside
58      the kernel tree does. Such modules that use library CRC16
59      functions require M here.
60
61config CRC_T10DIF
62    tristate "CRC calculation for the T10 Data Integrity Field"
63    help
64      This option is only needed if a module that's not in the
65      kernel tree needs to calculate CRC checks for use with the
66      SCSI data integrity subsystem.
67
68config CRC_ITU_T
69    tristate "CRC ITU-T V.41 functions"
70    help
71      This option is provided for the case where no in-kernel-tree
72      modules require CRC ITU-T V.41 functions, but a module built outside
73      the kernel tree does. Such modules that use library CRC ITU-T V.41
74      functions require M here.
75
76config CRC32
77    tristate "CRC32/CRC32c functions"
78    default y
79    select BITREVERSE
80    help
81      This option is provided for the case where no in-kernel-tree
82      modules require CRC32/CRC32c functions, but a module built outside
83      the kernel tree does. Such modules that use library CRC32/CRC32c
84      functions require M here.
85
86config CRC32_SELFTEST
87    bool "CRC32 perform self test on init"
88    default n
89    depends on CRC32
90    help
91      This option enables the CRC32 library functions to perform a
92      self test on initialization. The self test computes crc32_le
93      and crc32_be over byte strings with random alignment and length
94      and computes the total elapsed time and number of bytes processed.
95
96choice
97    prompt "CRC32 implementation"
98    depends on CRC32
99    default CRC32_SLICEBY8
100    help
101      This option allows a kernel builder to override the default choice
102      of CRC32 algorithm. Choose the default ("slice by 8") unless you
103      know that you need one of the others.
104
105config CRC32_SLICEBY8
106    bool "Slice by 8 bytes"
107    help
108      Calculate checksum 8 bytes at a time with a clever slicing algorithm.
109      This is the fastest algorithm, but comes with a 8KiB lookup table.
110      Most modern processors have enough cache to hold this table without
111      thrashing the cache.
112
113      This is the default implementation choice. Choose this one unless
114      you have a good reason not to.
115
116config CRC32_SLICEBY4
117    bool "Slice by 4 bytes"
118    help
119      Calculate checksum 4 bytes at a time with a clever slicing algorithm.
120      This is a bit slower than slice by 8, but has a smaller 4KiB lookup
121      table.
122
123      Only choose this option if you know what you are doing.
124
125config CRC32_SARWATE
126    bool "Sarwate's Algorithm (one byte at a time)"
127    help
128      Calculate checksum a byte at a time using Sarwate's algorithm. This
129      is not particularly fast, but has a small 256 byte lookup table.
130
131      Only choose this option if you know what you are doing.
132
133config CRC32_BIT
134    bool "Classic Algorithm (one bit at a time)"
135    help
136      Calculate checksum one bit at a time. This is VERY slow, but has
137      no lookup table. This is provided as a debugging option.
138
139      Only choose this option if you are debugging crc32.
140
141endchoice
142
143config CRC7
144    tristate "CRC7 functions"
145    help
146      This option is provided for the case where no in-kernel-tree
147      modules require CRC7 functions, but a module built outside
148      the kernel tree does. Such modules that use library CRC7
149      functions require M here.
150
151config LIBCRC32C
152    tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
153    select CRYPTO
154    select CRYPTO_CRC32C
155    help
156      This option is provided for the case where no in-kernel-tree
157      modules require CRC32c functions, but a module built outside the
158      kernel tree does. Such modules that use library CRC32c functions
159      require M here. See Castagnoli93.
160      Module will be libcrc32c.
161
162config CRC8
163    tristate "CRC8 function"
164    help
165      This option provides CRC8 function. Drivers may select this
166      when they need to do cyclic redundancy check according CRC8
167      algorithm. Module will be called crc8.
168
169config AUDIT_GENERIC
170    bool
171    depends on AUDIT && !AUDIT_ARCH
172    default y
173
174#
175# compression support is select'ed if needed
176#
177config ZLIB_INFLATE
178    tristate
179
180config ZLIB_DEFLATE
181    tristate
182
183config LZO_COMPRESS
184    tristate
185
186config LZO_DECOMPRESS
187    tristate
188
189source "lib/xz/Kconfig"
190
191#
192# These all provide a common interface (hence the apparent duplication with
193# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
194#
195config DECOMPRESS_GZIP
196    select ZLIB_INFLATE
197    tristate
198
199config DECOMPRESS_BZIP2
200    tristate
201
202config DECOMPRESS_LZMA
203    tristate
204
205config DECOMPRESS_XZ
206    select XZ_DEC
207    tristate
208
209config DECOMPRESS_LZO
210    select LZO_DECOMPRESS
211    tristate
212
213#
214# Generic allocator support is selected if needed
215#
216config GENERIC_ALLOCATOR
217    boolean
218
219#
220# reed solomon support is select'ed if needed
221#
222config REED_SOLOMON
223    tristate
224    
225config REED_SOLOMON_ENC8
226    boolean
227
228config REED_SOLOMON_DEC8
229    boolean
230
231config REED_SOLOMON_ENC16
232    boolean
233
234config REED_SOLOMON_DEC16
235    boolean
236
237#
238# BCH support is selected if needed
239#
240config BCH
241    tristate
242
243config BCH_CONST_PARAMS
244    boolean
245    help
246      Drivers may select this option to force specific constant
247      values for parameters 'm' (Galois field order) and 't'
248      (error correction capability). Those specific values must
249      be set by declaring default values for symbols BCH_CONST_M
250      and BCH_CONST_T.
251      Doing so will enable extra compiler optimizations,
252      improving encoding and decoding performance up to 2x for
253      usual (m,t) values (typically such that m*t < 200).
254      When this option is selected, the BCH library supports
255      only a single (m,t) configuration. This is mainly useful
256      for NAND flash board drivers requiring known, fixed BCH
257      parameters.
258
259config BCH_CONST_M
260    int
261    range 5 15
262    help
263      Constant value for Galois field order 'm'. If 'k' is the
264      number of data bits to protect, 'm' should be chosen such
265      that (k + m*t) <= 2**m - 1.
266      Drivers should declare a default value for this symbol if
267      they select option BCH_CONST_PARAMS.
268
269config BCH_CONST_T
270    int
271    help
272      Constant value for error correction capability in bits 't'.
273      Drivers should declare a default value for this symbol if
274      they select option BCH_CONST_PARAMS.
275
276#
277# Textsearch support is select'ed if needed
278#
279config TEXTSEARCH
280    boolean
281
282config TEXTSEARCH_KMP
283    tristate
284
285config TEXTSEARCH_BM
286    tristate
287
288config TEXTSEARCH_FSM
289    tristate
290
291config BTREE
292    boolean
293
294config HAS_IOMEM
295    boolean
296    depends on !NO_IOMEM
297    select GENERIC_IO
298    default y
299
300config HAS_IOPORT
301    boolean
302    depends on HAS_IOMEM && !NO_IOPORT
303    default y
304
305config HAS_DMA
306    boolean
307    depends on !NO_DMA
308    default y
309
310config CHECK_SIGNATURE
311    bool
312
313config CPUMASK_OFFSTACK
314    bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
315    help
316      Use dynamic allocation for cpumask_var_t, instead of putting
317      them on the stack. This is a bit more expensive, but avoids
318      stack overflow.
319
320config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
321       bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
322       depends on EXPERIMENTAL && BROKEN
323
324config CPU_RMAP
325    bool
326    depends on SMP
327
328config DQL
329    bool
330
331#
332# Netlink attribute parsing support is select'ed if needed
333#
334config NLATTR
335    bool
336
337#
338# Generic 64-bit atomic support is selected if needed
339#
340config GENERIC_ATOMIC64
341       bool
342
343config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
344    def_bool y if GENERIC_ATOMIC64
345
346config LRU_CACHE
347    tristate
348
349config AVERAGE
350    bool "Averaging functions"
351    help
352      This option is provided for the case where no in-kernel-tree
353      modules require averaging functions, but a module built outside
354      the kernel tree does. Such modules that use library averaging
355      functions require Y here.
356
357      If unsure, say N.
358
359config CLZ_TAB
360    bool
361
362config CORDIC
363    tristate "CORDIC algorithm"
364    help
365      This option provides an implementation of the CORDIC algorithm;
366      calculations are in fixed point. Module will be called cordic.
367
368config DDR
369    bool "JEDEC DDR data"
370    help
371      Data from JEDEC specs for DDR SDRAM memories,
372      particularly the AC timing parameters and addressing
373      information. This data is useful for drivers handling
374      DDR SDRAM controllers.
375
376config MPILIB
377    tristate
378    select CLZ_TAB
379    help
380      Multiprecision maths library from GnuPG.
381      It is used to implement RSA digital signature verification,
382      which is used by IMA/EVM digital signature extension.
383
384config SIGNATURE
385    tristate
386    depends on KEYS && CRYPTO
387    select CRYPTO_SHA1
388    select MPILIB
389    help
390      Digital signature verification. Currently only RSA is supported.
391      Implementation is done using GnuPG MPI library
392
393#
394# libfdt files, only selected if needed.
395#
396config LIBFDT
397    bool
398
399endmenu
400

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