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
51 config ARCH_USE_CMPXCHG_LOCKREF
54 config CMPXCHG_LOCKREF
55 def_bool y if ARCH_USE_CMPXCHG_LOCKREF
57 depends on !GENERIC_LOCKBREAK
58 depends on !DEBUG_SPINLOCK
59 depends on !DEBUG_LOCK_ALLOC
62 tristate "CRC-CCITT functions"
64 This option is provided for the case where no in-kernel-tree
65 modules require CRC-CCITT functions, but a module built outside
66 the kernel tree does. Such modules that use library CRC-CCITT
67 functions require M here.
70 tristate "CRC16 functions"
72 This option is provided for the case where no in-kernel-tree
73 modules require CRC16 functions, but a module built outside
74 the kernel tree does. Such modules that use library CRC16
75 functions require M here.
78 tristate "CRC calculation for the T10 Data Integrity Field"
80 select CRYPTO_CRCT10DIF
82 This option is only needed if a module that's not in the
83 kernel tree needs to calculate CRC checks for use with the
84 SCSI data integrity subsystem.
87 tristate "CRC ITU-T V.41 functions"
89 This option is provided for the case where no in-kernel-tree
90 modules require CRC ITU-T V.41 functions, but a module built outside
91 the kernel tree does. Such modules that use library CRC ITU-T V.41
92 functions require M here.
95 tristate "CRC32/CRC32c functions"
99 This option is provided for the case where no in-kernel-tree
100 modules require CRC32/CRC32c functions, but a module built outside
101 the kernel tree does. Such modules that use library CRC32/CRC32c
102 functions require M here.
104 config CRC32_SELFTEST
105 bool "CRC32 perform self test on init"
109 This option enables the CRC32 library functions to perform a
110 self test on initialization. The self test computes crc32_le
111 and crc32_be over byte strings with random alignment and length
112 and computes the total elapsed time and number of bytes processed.
115 prompt "CRC32 implementation"
117 default CRC32_SLICEBY8
119 This option allows a kernel builder to override the default choice
120 of CRC32 algorithm. Choose the default ("slice by 8") unless you
121 know that you need one of the others.
123 config CRC32_SLICEBY8
124 bool "Slice by 8 bytes"
126 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
127 This is the fastest algorithm, but comes with a 8KiB lookup table.
128 Most modern processors have enough cache to hold this table without
131 This is the default implementation choice. Choose this one unless
132 you have a good reason not to.
134 config CRC32_SLICEBY4
135 bool "Slice by 4 bytes"
137 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
138 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
141 Only choose this option if you know what you are doing.
144 bool "Sarwate's Algorithm (one byte at a time)"
146 Calculate checksum a byte at a time using Sarwate's algorithm. This
147 is not particularly fast, but has a small 256 byte lookup table.
149 Only choose this option if you know what you are doing.
152 bool "Classic Algorithm (one bit at a time)"
154 Calculate checksum one bit at a time. This is VERY slow, but has
155 no lookup table. This is provided as a debugging option.
157 Only choose this option if you are debugging crc32.
162 tristate "CRC7 functions"
164 This option is provided for the case where no in-kernel-tree
165 modules require CRC7 functions, but a module built outside
166 the kernel tree does. Such modules that use library CRC7
167 functions require M here.
170 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
174 This option is provided for the case where no in-kernel-tree
175 modules require CRC32c functions, but a module built outside the
176 kernel tree does. Such modules that use library CRC32c functions
177 require M here. See Castagnoli93.
178 Module will be libcrc32c.
181 tristate "CRC8 function"
183 This option provides CRC8 function. Drivers may select this
184 when they need to do cyclic redundancy check according CRC8
185 algorithm. Module will be called crc8.
189 depends on AUDIT && !AUDIT_ARCH
193 # compression support is select'ed if needed
204 config LZO_DECOMPRESS
210 config LZ4HC_COMPRESS
213 config LZ4_DECOMPRESS
216 source "lib/xz/Kconfig"
219 # These all provide a common interface (hence the apparent duplication with
220 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
222 config DECOMPRESS_GZIP
226 config DECOMPRESS_BZIP2
229 config DECOMPRESS_LZMA
236 config DECOMPRESS_LZO
237 select LZO_DECOMPRESS
240 config DECOMPRESS_LZ4
241 select LZ4_DECOMPRESS
245 # Generic allocator support is selected if needed
247 config GENERIC_ALLOCATOR
251 # reed solomon support is select'ed if needed
256 config REED_SOLOMON_ENC8
259 config REED_SOLOMON_DEC8
262 config REED_SOLOMON_ENC16
265 config REED_SOLOMON_DEC16
269 # BCH support is selected if needed
274 config BCH_CONST_PARAMS
277 Drivers may select this option to force specific constant
278 values for parameters 'm' (Galois field order) and 't'
279 (error correction capability). Those specific values must
280 be set by declaring default values for symbols BCH_CONST_M
282 Doing so will enable extra compiler optimizations,
283 improving encoding and decoding performance up to 2x for
284 usual (m,t) values (typically such that m*t < 200).
285 When this option is selected, the BCH library supports
286 only a single (m,t) configuration. This is mainly useful
287 for NAND flash board drivers requiring known, fixed BCH
294 Constant value for Galois field order 'm'. If 'k' is the
295 number of data bits to protect, 'm' should be chosen such
296 that (k + m*t) <= 2**m - 1.
297 Drivers should declare a default value for this symbol if
298 they select option BCH_CONST_PARAMS.
303 Constant value for error correction capability in bits 't'.
304 Drivers should declare a default value for this symbol if
305 they select option BCH_CONST_PARAMS.
308 # Textsearch support is select'ed if needed
313 config TEXTSEARCH_KMP
319 config TEXTSEARCH_FSM
333 depends on HAS_IOMEM && !NO_IOPORT
341 config CHECK_SIGNATURE
344 config CPUMASK_OFFSTACK
345 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
347 Use dynamic allocation for cpumask_var_t, instead of putting
348 them on the stack. This is a bit more expensive, but avoids
351 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
352 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
363 # Netlink attribute parsing support is select'ed if needed
369 # Generic 64-bit atomic support is selected if needed
371 config GENERIC_ATOMIC64
374 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
375 def_bool y if GENERIC_ATOMIC64
381 bool "Averaging functions"
383 This option is provided for the case where no in-kernel-tree
384 modules require averaging functions, but a module built outside
385 the kernel tree does. Such modules that use library averaging
386 functions require Y here.
394 tristate "CORDIC algorithm"
396 This option provides an implementation of the CORDIC algorithm;
397 calculations are in fixed point. Module will be called cordic.
400 bool "JEDEC DDR data"
402 Data from JEDEC specs for DDR SDRAM memories,
403 particularly the AC timing parameters and addressing
404 information. This data is useful for drivers handling
405 DDR SDRAM controllers.
411 Multiprecision maths library from GnuPG.
412 It is used to implement RSA digital signature verification,
413 which is used by IMA/EVM digital signature extension.
417 depends on KEYS && CRYPTO
421 Digital signature verification. Currently only RSA is supported.
422 Implementation is done using GnuPG MPI library
425 # libfdt files, only selected if needed.
433 Enable fast lookup object identifier registry.
438 source "lib/fonts/Kconfig"