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 select CRYPTO_CRCT10DIF
72 This option is only needed if a module that's not in the
73 kernel tree needs to calculate CRC checks for use with the
74 SCSI data integrity subsystem.
77 tristate "CRC ITU-T V.41 functions"
79 This option is provided for the case where no in-kernel-tree
80 modules require CRC ITU-T V.41 functions, but a module built outside
81 the kernel tree does. Such modules that use library CRC ITU-T V.41
82 functions require M here.
85 tristate "CRC32/CRC32c functions"
89 This option is provided for the case where no in-kernel-tree
90 modules require CRC32/CRC32c functions, but a module built outside
91 the kernel tree does. Such modules that use library CRC32/CRC32c
92 functions require M here.
95 bool "CRC32 perform self test on init"
99 This option enables the CRC32 library functions to perform a
100 self test on initialization. The self test computes crc32_le
101 and crc32_be over byte strings with random alignment and length
102 and computes the total elapsed time and number of bytes processed.
105 prompt "CRC32 implementation"
107 default CRC32_SLICEBY8
109 This option allows a kernel builder to override the default choice
110 of CRC32 algorithm. Choose the default ("slice by 8") unless you
111 know that you need one of the others.
113 config CRC32_SLICEBY8
114 bool "Slice by 8 bytes"
116 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
117 This is the fastest algorithm, but comes with a 8KiB lookup table.
118 Most modern processors have enough cache to hold this table without
121 This is the default implementation choice. Choose this one unless
122 you have a good reason not to.
124 config CRC32_SLICEBY4
125 bool "Slice by 4 bytes"
127 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
128 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
131 Only choose this option if you know what you are doing.
134 bool "Sarwate's Algorithm (one byte at a time)"
136 Calculate checksum a byte at a time using Sarwate's algorithm. This
137 is not particularly fast, but has a small 256 byte lookup table.
139 Only choose this option if you know what you are doing.
142 bool "Classic Algorithm (one bit at a time)"
144 Calculate checksum one bit at a time. This is VERY slow, but has
145 no lookup table. This is provided as a debugging option.
147 Only choose this option if you are debugging crc32.
152 tristate "CRC7 functions"
154 This option is provided for the case where no in-kernel-tree
155 modules require CRC7 functions, but a module built outside
156 the kernel tree does. Such modules that use library CRC7
157 functions require M here.
160 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
164 This option is provided for the case where no in-kernel-tree
165 modules require CRC32c functions, but a module built outside the
166 kernel tree does. Such modules that use library CRC32c functions
167 require M here. See Castagnoli93.
168 Module will be libcrc32c.
171 tristate "CRC8 function"
173 This option provides CRC8 function. Drivers may select this
174 when they need to do cyclic redundancy check according CRC8
175 algorithm. Module will be called crc8.
179 depends on AUDIT && !AUDIT_ARCH
183 # compression support is select'ed if needed
194 config LZO_DECOMPRESS
200 config LZ4HC_COMPRESS
203 config LZ4_DECOMPRESS
206 source "lib/xz/Kconfig"
209 # These all provide a common interface (hence the apparent duplication with
210 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
212 config DECOMPRESS_GZIP
216 config DECOMPRESS_BZIP2
219 config DECOMPRESS_LZMA
226 config DECOMPRESS_LZO
227 select LZO_DECOMPRESS
230 config DECOMPRESS_LZ4
231 select LZ4_DECOMPRESS
235 # Generic allocator support is selected if needed
237 config GENERIC_ALLOCATOR
241 # reed solomon support is select'ed if needed
246 config REED_SOLOMON_ENC8
249 config REED_SOLOMON_DEC8
252 config REED_SOLOMON_ENC16
255 config REED_SOLOMON_DEC16
259 # BCH support is selected if needed
264 config BCH_CONST_PARAMS
267 Drivers may select this option to force specific constant
268 values for parameters 'm' (Galois field order) and 't'
269 (error correction capability). Those specific values must
270 be set by declaring default values for symbols BCH_CONST_M
272 Doing so will enable extra compiler optimizations,
273 improving encoding and decoding performance up to 2x for
274 usual (m,t) values (typically such that m*t < 200).
275 When this option is selected, the BCH library supports
276 only a single (m,t) configuration. This is mainly useful
277 for NAND flash board drivers requiring known, fixed BCH
284 Constant value for Galois field order 'm'. If 'k' is the
285 number of data bits to protect, 'm' should be chosen such
286 that (k + m*t) <= 2**m - 1.
287 Drivers should declare a default value for this symbol if
288 they select option BCH_CONST_PARAMS.
293 Constant value for error correction capability in bits 't'.
294 Drivers should declare a default value for this symbol if
295 they select option BCH_CONST_PARAMS.
298 # Textsearch support is select'ed if needed
303 config TEXTSEARCH_KMP
309 config TEXTSEARCH_FSM
323 depends on HAS_IOMEM && !NO_IOPORT
331 config CHECK_SIGNATURE
334 config CPUMASK_OFFSTACK
335 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
337 Use dynamic allocation for cpumask_var_t, instead of putting
338 them on the stack. This is a bit more expensive, but avoids
341 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
342 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
353 # Netlink attribute parsing support is select'ed if needed
359 # Generic 64-bit atomic support is selected if needed
361 config GENERIC_ATOMIC64
364 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
365 def_bool y if GENERIC_ATOMIC64
371 bool "Averaging functions"
373 This option is provided for the case where no in-kernel-tree
374 modules require averaging functions, but a module built outside
375 the kernel tree does. Such modules that use library averaging
376 functions require Y here.
384 tristate "CORDIC algorithm"
386 This option provides an implementation of the CORDIC algorithm;
387 calculations are in fixed point. Module will be called cordic.
390 bool "JEDEC DDR data"
392 Data from JEDEC specs for DDR SDRAM memories,
393 particularly the AC timing parameters and addressing
394 information. This data is useful for drivers handling
395 DDR SDRAM controllers.
401 Multiprecision maths library from GnuPG.
402 It is used to implement RSA digital signature verification,
403 which is used by IMA/EVM digital signature extension.
407 depends on KEYS && CRYPTO
411 Digital signature verification. Currently only RSA is supported.
412 Implementation is done using GnuPG MPI library
415 # libfdt files, only selected if needed.
423 Enable fast lookup object identifier registry.
428 source "lib/fonts/Kconfig"