2 # Library configuration
8 menu "Library routines"
19 config GENERIC_STRNCPY_FROM_USER
22 config GENERIC_STRNLEN_USER
25 config GENERIC_NET_UTILS
28 config GENERIC_FIND_FIRST_BIT
31 config NO_GENERIC_PCI_IOPORT_MAP
34 config GENERIC_PCI_IOMAP
39 select GENERIC_PCI_IOMAP
52 tristate "CRC-CCITT functions"
54 This option is provided for the case where no in-kernel-tree
55 modules require CRC-CCITT functions, but a module built outside
56 the kernel tree does. Such modules that use library CRC-CCITT
57 functions require M here.
60 tristate "CRC16 functions"
62 This option is provided for the case where no in-kernel-tree
63 modules require CRC16 functions, but a module built outside
64 the kernel tree does. Such modules that use library CRC16
65 functions require M here.
68 tristate "CRC calculation for the T10 Data Integrity Field"
70 This option is only needed if a module that's not in the
71 kernel tree needs to calculate CRC checks for use with the
72 SCSI data integrity subsystem.
75 tristate "CRC ITU-T V.41 functions"
77 This option is provided for the case where no in-kernel-tree
78 modules require CRC ITU-T V.41 functions, but a module built outside
79 the kernel tree does. Such modules that use library CRC ITU-T V.41
80 functions require M here.
83 tristate "CRC32/CRC32c functions"
87 This option is provided for the case where no in-kernel-tree
88 modules require CRC32/CRC32c functions, but a module built outside
89 the kernel tree does. Such modules that use library CRC32/CRC32c
90 functions require M here.
93 bool "CRC32 perform self test on init"
97 This option enables the CRC32 library functions to perform a
98 self test on initialization. The self test computes crc32_le
99 and crc32_be over byte strings with random alignment and length
100 and computes the total elapsed time and number of bytes processed.
103 prompt "CRC32 implementation"
105 default CRC32_SLICEBY8
107 This option allows a kernel builder to override the default choice
108 of CRC32 algorithm. Choose the default ("slice by 8") unless you
109 know that you need one of the others.
111 config CRC32_SLICEBY8
112 bool "Slice by 8 bytes"
114 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
115 This is the fastest algorithm, but comes with a 8KiB lookup table.
116 Most modern processors have enough cache to hold this table without
119 This is the default implementation choice. Choose this one unless
120 you have a good reason not to.
122 config CRC32_SLICEBY4
123 bool "Slice by 4 bytes"
125 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
126 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
129 Only choose this option if you know what you are doing.
132 bool "Sarwate's Algorithm (one byte at a time)"
134 Calculate checksum a byte at a time using Sarwate's algorithm. This
135 is not particularly fast, but has a small 256 byte lookup table.
137 Only choose this option if you know what you are doing.
140 bool "Classic Algorithm (one bit at a time)"
142 Calculate checksum one bit at a time. This is VERY slow, but has
143 no lookup table. This is provided as a debugging option.
145 Only choose this option if you are debugging crc32.
150 tristate "CRC7 functions"
152 This option is provided for the case where no in-kernel-tree
153 modules require CRC7 functions, but a module built outside
154 the kernel tree does. Such modules that use library CRC7
155 functions require M here.
158 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
162 This option is provided for the case where no in-kernel-tree
163 modules require CRC32c functions, but a module built outside the
164 kernel tree does. Such modules that use library CRC32c functions
165 require M here. See Castagnoli93.
166 Module will be libcrc32c.
169 tristate "CRC8 function"
171 This option provides CRC8 function. Drivers may select this
172 when they need to do cyclic redundancy check according CRC8
173 algorithm. Module will be called crc8.
177 depends on AUDIT && !AUDIT_ARCH
181 # compression support is select'ed if needed
192 config LZO_DECOMPRESS
195 source "lib/xz/Kconfig"
198 # These all provide a common interface (hence the apparent duplication with
199 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
201 config DECOMPRESS_GZIP
205 config DECOMPRESS_BZIP2
208 config DECOMPRESS_LZMA
215 config DECOMPRESS_LZO
216 select LZO_DECOMPRESS
220 # Generic allocator support is selected if needed
222 config GENERIC_ALLOCATOR
226 # reed solomon support is select'ed if needed
231 config REED_SOLOMON_ENC8
234 config REED_SOLOMON_DEC8
237 config REED_SOLOMON_ENC16
240 config REED_SOLOMON_DEC16
244 # BCH support is selected if needed
249 config BCH_CONST_PARAMS
252 Drivers may select this option to force specific constant
253 values for parameters 'm' (Galois field order) and 't'
254 (error correction capability). Those specific values must
255 be set by declaring default values for symbols BCH_CONST_M
257 Doing so will enable extra compiler optimizations,
258 improving encoding and decoding performance up to 2x for
259 usual (m,t) values (typically such that m*t < 200).
260 When this option is selected, the BCH library supports
261 only a single (m,t) configuration. This is mainly useful
262 for NAND flash board drivers requiring known, fixed BCH
269 Constant value for Galois field order 'm'. If 'k' is the
270 number of data bits to protect, 'm' should be chosen such
271 that (k + m*t) <= 2**m - 1.
272 Drivers should declare a default value for this symbol if
273 they select option BCH_CONST_PARAMS.
278 Constant value for error correction capability in bits 't'.
279 Drivers should declare a default value for this symbol if
280 they select option BCH_CONST_PARAMS.
283 # Textsearch support is select'ed if needed
288 config TEXTSEARCH_KMP
294 config TEXTSEARCH_FSM
308 depends on HAS_IOMEM && !NO_IOPORT
316 config CHECK_SIGNATURE
319 config CPUMASK_OFFSTACK
320 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
322 Use dynamic allocation for cpumask_var_t, instead of putting
323 them on the stack. This is a bit more expensive, but avoids
326 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
327 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
338 # Netlink attribute parsing support is select'ed if needed
344 # Generic 64-bit atomic support is selected if needed
346 config GENERIC_ATOMIC64
349 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
350 def_bool y if GENERIC_ATOMIC64
356 bool "Averaging functions"
358 This option is provided for the case where no in-kernel-tree
359 modules require averaging functions, but a module built outside
360 the kernel tree does. Such modules that use library averaging
361 functions require Y here.
369 tristate "CORDIC algorithm"
371 This option provides an implementation of the CORDIC algorithm;
372 calculations are in fixed point. Module will be called cordic.
375 bool "JEDEC DDR data"
377 Data from JEDEC specs for DDR SDRAM memories,
378 particularly the AC timing parameters and addressing
379 information. This data is useful for drivers handling
380 DDR SDRAM controllers.
386 Multiprecision maths library from GnuPG.
387 It is used to implement RSA digital signature verification,
388 which is used by IMA/EVM digital signature extension.
392 depends on KEYS && CRYPTO
396 Digital signature verification. Currently only RSA is supported.
397 Implementation is done using GnuPG MPI library
400 # libfdt files, only selected if needed.
408 Enable fast lookup object identifier registry.