2 # Library configuration
8 menu "Library routines"
19 config GENERIC_FIND_FIRST_BIT
22 config NO_GENERIC_PCI_IOPORT_MAP
25 config GENERIC_PCI_IOMAP
30 select GENERIC_PCI_IOMAP
37 tristate "CRC-CCITT functions"
39 This option is provided for the case where no in-kernel-tree
40 modules require CRC-CCITT functions, but a module built outside
41 the kernel tree does. Such modules that use library CRC-CCITT
42 functions require M here.
45 tristate "CRC16 functions"
47 This option is provided for the case where no in-kernel-tree
48 modules require CRC16 functions, but a module built outside
49 the kernel tree does. Such modules that use library CRC16
50 functions require M here.
53 tristate "CRC calculation for the T10 Data Integrity Field"
55 This option is only needed if a module that's not in the
56 kernel tree needs to calculate CRC checks for use with the
57 SCSI data integrity subsystem.
60 tristate "CRC ITU-T V.41 functions"
62 This option is provided for the case where no in-kernel-tree
63 modules require CRC ITU-T V.41 functions, but a module built outside
64 the kernel tree does. Such modules that use library CRC ITU-T V.41
65 functions require M here.
68 tristate "CRC32/CRC32c functions"
72 This option is provided for the case where no in-kernel-tree
73 modules require CRC32/CRC32c functions, but a module built outside
74 the kernel tree does. Such modules that use library CRC32/CRC32c
75 functions require M here.
78 bool "CRC32 perform self test on init"
82 This option enables the CRC32 library functions to perform a
83 self test on initialization. The self test computes crc32_le
84 and crc32_be over byte strings with random alignment and length
85 and computes the total elapsed time and number of bytes processed.
88 prompt "CRC32 implementation"
90 default CRC32_SLICEBY8
93 bool "Slice by 8 bytes"
95 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
96 This is the fastest algorithm, but comes with a 8KiB lookup table.
97 Most modern processors have enough cache to hold this table without
100 This is the default implementation choice. Choose this one unless
101 you have a good reason not to.
103 config CRC32_SLICEBY4
104 bool "Slice by 4 bytes"
106 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
107 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
110 Only choose this option if you know what you are doing.
113 bool "Sarwate's Algorithm (one byte at a time)"
115 Calculate checksum a byte at a time using Sarwate's algorithm. This
116 is not particularly fast, but has a small 256 byte lookup table.
118 Only choose this option if you know what you are doing.
121 bool "Classic Algorithm (one bit at a time)"
123 Calculate checksum one bit at a time. This is VERY slow, but has
124 no lookup table. This is provided as a debugging option.
126 Only choose this option if you are debugging crc32.
131 tristate "CRC7 functions"
133 This option is provided for the case where no in-kernel-tree
134 modules require CRC7 functions, but a module built outside
135 the kernel tree does. Such modules that use library CRC7
136 functions require M here.
139 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
143 This option is provided for the case where no in-kernel-tree
144 modules require CRC32c functions, but a module built outside the
145 kernel tree does. Such modules that use library CRC32c functions
146 require M here. See Castagnoli93.
147 Module will be libcrc32c.
150 tristate "CRC8 function"
152 This option provides CRC8 function. Drivers may select this
153 when they need to do cyclic redundancy check according CRC8
154 algorithm. Module will be called crc8.
158 depends on AUDIT && !AUDIT_ARCH
162 # compression support is select'ed if needed
173 config LZO_DECOMPRESS
176 source "lib/xz/Kconfig"
179 # These all provide a common interface (hence the apparent duplication with
180 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
182 config DECOMPRESS_GZIP
186 config DECOMPRESS_BZIP2
189 config DECOMPRESS_LZMA
196 config DECOMPRESS_LZO
197 select LZO_DECOMPRESS
201 # Generic allocator support is selected if needed
203 config GENERIC_ALLOCATOR
207 # reed solomon support is select'ed if needed
212 config REED_SOLOMON_ENC8
215 config REED_SOLOMON_DEC8
218 config REED_SOLOMON_ENC16
221 config REED_SOLOMON_DEC16
225 # BCH support is selected if needed
230 config BCH_CONST_PARAMS
233 Drivers may select this option to force specific constant
234 values for parameters 'm' (Galois field order) and 't'
235 (error correction capability). Those specific values must
236 be set by declaring default values for symbols BCH_CONST_M
238 Doing so will enable extra compiler optimizations,
239 improving encoding and decoding performance up to 2x for
240 usual (m,t) values (typically such that m*t < 200).
241 When this option is selected, the BCH library supports
242 only a single (m,t) configuration. This is mainly useful
243 for NAND flash board drivers requiring known, fixed BCH
250 Constant value for Galois field order 'm'. If 'k' is the
251 number of data bits to protect, 'm' should be chosen such
252 that (k + m*t) <= 2**m - 1.
253 Drivers should declare a default value for this symbol if
254 they select option BCH_CONST_PARAMS.
259 Constant value for error correction capability in bits 't'.
260 Drivers should declare a default value for this symbol if
261 they select option BCH_CONST_PARAMS.
264 # Textsearch support is select'ed if needed
269 config TEXTSEARCH_KMP
275 config TEXTSEARCH_FSM
289 depends on HAS_IOMEM && !NO_IOPORT
297 config CHECK_SIGNATURE
300 config CPUMASK_OFFSTACK
301 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
303 Use dynamic allocation for cpumask_var_t, instead of putting
304 them on the stack. This is a bit more expensive, but avoids
307 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
308 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
309 depends on EXPERIMENTAL && BROKEN
319 # Netlink attribute parsing support is select'ed if needed
325 # Generic 64-bit atomic support is selected if needed
327 config GENERIC_ATOMIC64
334 bool "Averaging functions"
336 This option is provided for the case where no in-kernel-tree
337 modules require averaging functions, but a module built outside
338 the kernel tree does. Such modules that use library averaging
339 functions require Y here.
347 tristate "CORDIC algorithm"
349 This option provides an implementation of the CORDIC algorithm;
350 calculations are in fixed point. Module will be called cordic.
356 Multiprecision maths library from GnuPG.
357 It is used to implement RSA digital signature verification,
358 which is used by IMA/EVM digital signature extension.
364 Additional sources of multiprecision maths library from GnuPG.
365 This code is unnecessary for RSA digital signature verification,
366 but can be compiled if needed.
370 depends on KEYS && CRYPTO
374 Digital signature verification. Currently only RSA is supported.
375 Implementation is done using GnuPG MPI library