lib/Kconfig

#
# Library configuration
#

config BINARY_PRINTF
def_bool n

menu "Library routines"

config RAID6_PQ
tristate

config BITREVERSE
tristate

config RATIONAL
boolean

config GENERIC_STRNCPY_FROM_USER
bool

config GENERIC_STRNLEN_USER
bool

config GENERIC_FIND_FIRST_BIT
bool

config NO_GENERIC_PCI_IOPORT_MAP
bool

config GENERIC_PCI_IOMAP
bool

config GENERIC_IOMAP
bool
select GENERIC_PCI_IOMAP

config GENERIC_IO
boolean
default n

config STMP_DEVICE
bool

config PERCPU_RWSEM
boolean

config CRC_CCITT
tristate "CRC-CCITT functions"
help
 This option is provided for the case where no in-kernel-tree
 modules require CRC-CCITT functions, but a module built outside
 the kernel tree does. Such modules that use library CRC-CCITT
 functions require M here.

config CRC16
tristate "CRC16 functions"
help
 This option is provided for the case where no in-kernel-tree
 modules require CRC16 functions, but a module built outside
 the kernel tree does. Such modules that use library CRC16
 functions require M here.

config CRC_T10DIF
tristate "CRC calculation for the T10 Data Integrity Field"
help
 This option is only needed if a module that's not in the
 kernel tree needs to calculate CRC checks for use with the
 SCSI data integrity subsystem.

config CRC_ITU_T
tristate "CRC ITU-T V.41 functions"
help
 This option is provided for the case where no in-kernel-tree
 modules require CRC ITU-T V.41 functions, but a module built outside
 the kernel tree does. Such modules that use library CRC ITU-T V.41
 functions require M here.

config CRC32
tristate "CRC32/CRC32c functions"
default y
select BITREVERSE
help
 This option is provided for the case where no in-kernel-tree
 modules require CRC32/CRC32c functions, but a module built outside
 the kernel tree does. Such modules that use library CRC32/CRC32c
 functions require M here.

config CRC32_SELFTEST
bool "CRC32 perform self test on init"
default n
depends on CRC32
help
 This option enables the CRC32 library functions to perform a
 self test on initialization. The self test computes crc32_le
 and crc32_be over byte strings with random alignment and length
 and computes the total elapsed time and number of bytes processed.

choice
prompt "CRC32 implementation"
depends on CRC32
default CRC32_SLICEBY8
help
 This option allows a kernel builder to override the default choice
 of CRC32 algorithm. Choose the default ("slice by 8") unless you
 know that you need one of the others.

config CRC32_SLICEBY8
bool "Slice by 8 bytes"
help
 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
 This is the fastest algorithm, but comes with a 8KiB lookup table.
 Most modern processors have enough cache to hold this table without
 thrashing the cache.

 This is the default implementation choice. Choose this one unless
 you have a good reason not to.

config CRC32_SLICEBY4
bool "Slice by 4 bytes"
help
 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
 table.

 Only choose this option if you know what you are doing.

config CRC32_SARWATE
bool "Sarwate's Algorithm (one byte at a time)"
help
 Calculate checksum a byte at a time using Sarwate's algorithm. This
 is not particularly fast, but has a small 256 byte lookup table.

 Only choose this option if you know what you are doing.

config CRC32_BIT
bool "Classic Algorithm (one bit at a time)"
help
 Calculate checksum one bit at a time. This is VERY slow, but has
 no lookup table. This is provided as a debugging option.

 Only choose this option if you are debugging crc32.

endchoice

config CRC7
tristate "CRC7 functions"
help
 This option is provided for the case where no in-kernel-tree
 modules require CRC7 functions, but a module built outside
 the kernel tree does. Such modules that use library CRC7
 functions require M here.

config LIBCRC32C
tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
select CRYPTO
select CRYPTO_CRC32C
help
 This option is provided for the case where no in-kernel-tree
 modules require CRC32c functions, but a module built outside the
 kernel tree does. Such modules that use library CRC32c functions
 require M here. See Castagnoli93.
 Module will be libcrc32c.

config CRC8
tristate "CRC8 function"
help
 This option provides CRC8 function. Drivers may select this
 when they need to do cyclic redundancy check according CRC8
 algorithm. Module will be called crc8.

config AUDIT_GENERIC
bool
depends on AUDIT && !AUDIT_ARCH
default y

#
# compression support is select'ed if needed
#
config ZLIB_INFLATE
tristate

config ZLIB_DEFLATE
tristate

config LZO_COMPRESS
tristate

config LZO_DECOMPRESS
tristate

source "lib/xz/Kconfig"

#
# These all provide a common interface (hence the apparent duplication with
# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
#
config DECOMPRESS_GZIP
select ZLIB_INFLATE
tristate

config DECOMPRESS_BZIP2
tristate

config DECOMPRESS_LZMA
tristate

config DECOMPRESS_XZ
select XZ_DEC
tristate

config DECOMPRESS_LZO
select LZO_DECOMPRESS
tristate

#
# Generic allocator support is selected if needed
#
config GENERIC_ALLOCATOR
boolean

#
# reed solomon support is select'ed if needed
#
config REED_SOLOMON
tristate

config REED_SOLOMON_ENC8
boolean

config REED_SOLOMON_DEC8
boolean

config REED_SOLOMON_ENC16
boolean

config REED_SOLOMON_DEC16
boolean

#
# BCH support is selected if needed
#
config BCH
tristate

config BCH_CONST_PARAMS
boolean
help
 Drivers may select this option to force specific constant
 values for parameters 'm' (Galois field order) and 't'
 (error correction capability). Those specific values must
 be set by declaring default values for symbols BCH_CONST_M
 and BCH_CONST_T.
 Doing so will enable extra compiler optimizations,
 improving encoding and decoding performance up to 2x for
 usual (m,t) values (typically such that m*t < 200).
 When this option is selected, the BCH library supports
 only a single (m,t) configuration. This is mainly useful
 for NAND flash board drivers requiring known, fixed BCH
 parameters.

config BCH_CONST_M
int
range 5 15
help
 Constant value for Galois field order 'm'. If 'k' is the
 number of data bits to protect, 'm' should be chosen such
 that (k + m*t) <= 2**m - 1.
 Drivers should declare a default value for this symbol if
 they select option BCH_CONST_PARAMS.

config BCH_CONST_T
int
help
 Constant value for error correction capability in bits 't'.
 Drivers should declare a default value for this symbol if
 they select option BCH_CONST_PARAMS.

#
# Textsearch support is select'ed if needed
#
config TEXTSEARCH
boolean

config TEXTSEARCH_KMP
tristate

config TEXTSEARCH_BM
tristate

config TEXTSEARCH_FSM
tristate

config BTREE
boolean

config HAS_IOMEM
boolean
depends on !NO_IOMEM
select GENERIC_IO
default y

config HAS_IOPORT
boolean
depends on HAS_IOMEM && !NO_IOPORT
default y

config HAS_DMA
boolean
depends on !NO_DMA
default y

config CHECK_SIGNATURE
bool

config CPUMASK_OFFSTACK
bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
help
 Use dynamic allocation for cpumask_var_t, instead of putting
 them on the stack. This is a bit more expensive, but avoids
 stack overflow.

config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
 depends on BROKEN

config CPU_RMAP
bool
depends on SMP

config DQL
bool

#
# Netlink attribute parsing support is select'ed if needed
#
config NLATTR
bool

#
# Generic 64-bit atomic support is selected if needed
#
config GENERIC_ATOMIC64
 bool

config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
def_bool y if GENERIC_ATOMIC64

config LRU_CACHE
tristate

config AVERAGE
bool "Averaging functions"
help
 This option is provided for the case where no in-kernel-tree
 modules require averaging functions, but a module built outside
 the kernel tree does. Such modules that use library averaging
 functions require Y here.

 If unsure, say N.

config CLZ_TAB
bool

config CORDIC
tristate "CORDIC algorithm"
help
 This option provides an implementation of the CORDIC algorithm;
 calculations are in fixed point. Module will be called cordic.

config DDR
bool "JEDEC DDR data"
help
 Data from JEDEC specs for DDR SDRAM memories,
 particularly the AC timing parameters and addressing
 information. This data is useful for drivers handling
 DDR SDRAM controllers.

config MPILIB
tristate
select CLZ_TAB
help
 Multiprecision maths library from GnuPG.
 It is used to implement RSA digital signature verification,
 which is used by IMA/EVM digital signature extension.

config SIGNATURE
tristate
depends on KEYS && CRYPTO
select CRYPTO_SHA1
select MPILIB
help
 Digital signature verification. Currently only RSA is supported.
 Implementation is done using GnuPG MPI library

#
# libfdt files, only selected if needed.
#
config LIBFDT
bool

config OID_REGISTRY
tristate
help
 Enable fast lookup object identifier registry.

config UCS2_STRING
 tristate

endmenu