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
92 This option allows a kernel builder to override the default choice
93 of CRC32 algorithm. Choose the default ("slice by 8") unless you
94 know that you need one of the others.
97 bool "Slice by 8 bytes"
99 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
100 This is the fastest algorithm, but comes with a 8KiB lookup table.
101 Most modern processors have enough cache to hold this table without
104 This is the default implementation choice. Choose this one unless
105 you have a good reason not to.
107 config CRC32_SLICEBY4
108 bool "Slice by 4 bytes"
110 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
111 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
114 Only choose this option if you know what you are doing.
117 bool "Sarwate's Algorithm (one byte at a time)"
119 Calculate checksum a byte at a time using Sarwate's algorithm. This
120 is not particularly fast, but has a small 256 byte lookup table.
122 Only choose this option if you know what you are doing.
125 bool "Classic Algorithm (one bit at a time)"
127 Calculate checksum one bit at a time. This is VERY slow, but has
128 no lookup table. This is provided as a debugging option.
130 Only choose this option if you are debugging crc32.
135 tristate "CRC7 functions"
137 This option is provided for the case where no in-kernel-tree
138 modules require CRC7 functions, but a module built outside
139 the kernel tree does. Such modules that use library CRC7
140 functions require M here.
143 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
147 This option is provided for the case where no in-kernel-tree
148 modules require CRC32c functions, but a module built outside the
149 kernel tree does. Such modules that use library CRC32c functions
150 require M here. See Castagnoli93.
151 Module will be libcrc32c.
154 tristate "CRC8 function"
156 This option provides CRC8 function. Drivers may select this
157 when they need to do cyclic redundancy check according CRC8
158 algorithm. Module will be called crc8.
162 depends on AUDIT && !AUDIT_ARCH
166 # compression support is select'ed if needed
177 config LZO_DECOMPRESS
180 source "lib/xz/Kconfig"
183 # These all provide a common interface (hence the apparent duplication with
184 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
186 config DECOMPRESS_GZIP
190 config DECOMPRESS_BZIP2
193 config DECOMPRESS_LZMA
200 config DECOMPRESS_LZO
201 select LZO_DECOMPRESS
205 # Generic allocator support is selected if needed
207 config GENERIC_ALLOCATOR
211 # reed solomon support is select'ed if needed
216 config REED_SOLOMON_ENC8
219 config REED_SOLOMON_DEC8
222 config REED_SOLOMON_ENC16
225 config REED_SOLOMON_DEC16
229 # BCH support is selected if needed
234 config BCH_CONST_PARAMS
237 Drivers may select this option to force specific constant
238 values for parameters 'm' (Galois field order) and 't'
239 (error correction capability). Those specific values must
240 be set by declaring default values for symbols BCH_CONST_M
242 Doing so will enable extra compiler optimizations,
243 improving encoding and decoding performance up to 2x for
244 usual (m,t) values (typically such that m*t < 200).
245 When this option is selected, the BCH library supports
246 only a single (m,t) configuration. This is mainly useful
247 for NAND flash board drivers requiring known, fixed BCH
254 Constant value for Galois field order 'm'. If 'k' is the
255 number of data bits to protect, 'm' should be chosen such
256 that (k + m*t) <= 2**m - 1.
257 Drivers should declare a default value for this symbol if
258 they select option BCH_CONST_PARAMS.
263 Constant value for error correction capability in bits 't'.
264 Drivers should declare a default value for this symbol if
265 they select option BCH_CONST_PARAMS.
268 # Textsearch support is select'ed if needed
273 config TEXTSEARCH_KMP
279 config TEXTSEARCH_FSM
293 depends on HAS_IOMEM && !NO_IOPORT
301 config CHECK_SIGNATURE
304 config CPUMASK_OFFSTACK
305 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
307 Use dynamic allocation for cpumask_var_t, instead of putting
308 them on the stack. This is a bit more expensive, but avoids
311 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
312 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
313 depends on EXPERIMENTAL && BROKEN
323 # Netlink attribute parsing support is select'ed if needed
329 # Generic 64-bit atomic support is selected if needed
331 config GENERIC_ATOMIC64
338 bool "Averaging functions"
340 This option is provided for the case where no in-kernel-tree
341 modules require averaging functions, but a module built outside
342 the kernel tree does. Such modules that use library averaging
343 functions require Y here.
351 tristate "CORDIC algorithm"
353 This option provides an implementation of the CORDIC algorithm;
354 calculations are in fixed point. Module will be called cordic.
360 Multiprecision maths library from GnuPG.
361 It is used to implement RSA digital signature verification,
362 which is used by IMA/EVM digital signature extension.
368 Additional sources of multiprecision maths library from GnuPG.
369 This code is unnecessary for RSA digital signature verification,
370 but can be compiled if needed.
374 depends on KEYS && CRYPTO
378 Digital signature verification. Currently only RSA is supported.
379 Implementation is done using GnuPG MPI library