2 # Library configuration
8 menu "Library routines"
19 config GENERIC_STRNCPY_FROM_USER
22 config GENERIC_STRNLEN_USER
25 config GENERIC_FIND_FIRST_BIT
28 config NO_GENERIC_PCI_IOPORT_MAP
31 config GENERIC_PCI_IOMAP
36 select GENERIC_PCI_IOMAP
49 tristate "CRC-CCITT functions"
51 This option is provided for the case where no in-kernel-tree
52 modules require CRC-CCITT functions, but a module built outside
53 the kernel tree does. Such modules that use library CRC-CCITT
54 functions require M here.
57 tristate "CRC16 functions"
59 This option is provided for the case where no in-kernel-tree
60 modules require CRC16 functions, but a module built outside
61 the kernel tree does. Such modules that use library CRC16
62 functions require M here.
65 tristate "CRC calculation for the T10 Data Integrity Field"
67 This option is only needed if a module that's not in the
68 kernel tree needs to calculate CRC checks for use with the
69 SCSI data integrity subsystem.
72 tristate "CRC ITU-T V.41 functions"
74 This option is provided for the case where no in-kernel-tree
75 modules require CRC ITU-T V.41 functions, but a module built outside
76 the kernel tree does. Such modules that use library CRC ITU-T V.41
77 functions require M here.
80 tristate "CRC32/CRC32c functions"
84 This option is provided for the case where no in-kernel-tree
85 modules require CRC32/CRC32c functions, but a module built outside
86 the kernel tree does. Such modules that use library CRC32/CRC32c
87 functions require M here.
90 bool "CRC32 perform self test on init"
94 This option enables the CRC32 library functions to perform a
95 self test on initialization. The self test computes crc32_le
96 and crc32_be over byte strings with random alignment and length
97 and computes the total elapsed time and number of bytes processed.
100 prompt "CRC32 implementation"
102 default CRC32_SLICEBY8
104 This option allows a kernel builder to override the default choice
105 of CRC32 algorithm. Choose the default ("slice by 8") unless you
106 know that you need one of the others.
108 config CRC32_SLICEBY8
109 bool "Slice by 8 bytes"
111 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
112 This is the fastest algorithm, but comes with a 8KiB lookup table.
113 Most modern processors have enough cache to hold this table without
116 This is the default implementation choice. Choose this one unless
117 you have a good reason not to.
119 config CRC32_SLICEBY4
120 bool "Slice by 4 bytes"
122 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
123 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
126 Only choose this option if you know what you are doing.
129 bool "Sarwate's Algorithm (one byte at a time)"
131 Calculate checksum a byte at a time using Sarwate's algorithm. This
132 is not particularly fast, but has a small 256 byte lookup table.
134 Only choose this option if you know what you are doing.
137 bool "Classic Algorithm (one bit at a time)"
139 Calculate checksum one bit at a time. This is VERY slow, but has
140 no lookup table. This is provided as a debugging option.
142 Only choose this option if you are debugging crc32.
147 tristate "CRC7 functions"
149 This option is provided for the case where no in-kernel-tree
150 modules require CRC7 functions, but a module built outside
151 the kernel tree does. Such modules that use library CRC7
152 functions require M here.
155 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
159 This option is provided for the case where no in-kernel-tree
160 modules require CRC32c functions, but a module built outside the
161 kernel tree does. Such modules that use library CRC32c functions
162 require M here. See Castagnoli93.
163 Module will be libcrc32c.
166 tristate "CRC8 function"
168 This option provides CRC8 function. Drivers may select this
169 when they need to do cyclic redundancy check according CRC8
170 algorithm. Module will be called crc8.
174 depends on AUDIT && !AUDIT_ARCH
178 # compression support is select'ed if needed
189 config LZO_DECOMPRESS
192 source "lib/xz/Kconfig"
195 # These all provide a common interface (hence the apparent duplication with
196 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
198 config DECOMPRESS_GZIP
202 config DECOMPRESS_BZIP2
205 config DECOMPRESS_LZMA
212 config DECOMPRESS_LZO
213 select LZO_DECOMPRESS
217 # Generic allocator support is selected if needed
219 config GENERIC_ALLOCATOR
223 # reed solomon support is select'ed if needed
228 config REED_SOLOMON_ENC8
231 config REED_SOLOMON_DEC8
234 config REED_SOLOMON_ENC16
237 config REED_SOLOMON_DEC16
241 # BCH support is selected if needed
246 config BCH_CONST_PARAMS
249 Drivers may select this option to force specific constant
250 values for parameters 'm' (Galois field order) and 't'
251 (error correction capability). Those specific values must
252 be set by declaring default values for symbols BCH_CONST_M
254 Doing so will enable extra compiler optimizations,
255 improving encoding and decoding performance up to 2x for
256 usual (m,t) values (typically such that m*t < 200).
257 When this option is selected, the BCH library supports
258 only a single (m,t) configuration. This is mainly useful
259 for NAND flash board drivers requiring known, fixed BCH
266 Constant value for Galois field order 'm'. If 'k' is the
267 number of data bits to protect, 'm' should be chosen such
268 that (k + m*t) <= 2**m - 1.
269 Drivers should declare a default value for this symbol if
270 they select option BCH_CONST_PARAMS.
275 Constant value for error correction capability in bits 't'.
276 Drivers should declare a default value for this symbol if
277 they select option BCH_CONST_PARAMS.
280 # Textsearch support is select'ed if needed
285 config TEXTSEARCH_KMP
291 config TEXTSEARCH_FSM
305 depends on HAS_IOMEM && !NO_IOPORT
313 config CHECK_SIGNATURE
316 config CPUMASK_OFFSTACK
317 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
319 Use dynamic allocation for cpumask_var_t, instead of putting
320 them on the stack. This is a bit more expensive, but avoids
323 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
324 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
335 # Netlink attribute parsing support is select'ed if needed
341 # Generic 64-bit atomic support is selected if needed
343 config GENERIC_ATOMIC64
346 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
347 def_bool y if GENERIC_ATOMIC64
353 bool "Averaging functions"
355 This option is provided for the case where no in-kernel-tree
356 modules require averaging functions, but a module built outside
357 the kernel tree does. Such modules that use library averaging
358 functions require Y here.
366 tristate "CORDIC algorithm"
368 This option provides an implementation of the CORDIC algorithm;
369 calculations are in fixed point. Module will be called cordic.
372 bool "JEDEC DDR data"
374 Data from JEDEC specs for DDR SDRAM memories,
375 particularly the AC timing parameters and addressing
376 information. This data is useful for drivers handling
377 DDR SDRAM controllers.
383 Multiprecision maths library from GnuPG.
384 It is used to implement RSA digital signature verification,
385 which is used by IMA/EVM digital signature extension.
389 depends on KEYS && CRYPTO
393 Digital signature verification. Currently only RSA is supported.
394 Implementation is done using GnuPG MPI library
397 # libfdt files, only selected if needed.
405 Enable fast lookup object identifier registry.