627 lines
14 KiB
Plaintext
627 lines
14 KiB
Plaintext
#
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# Library configuration
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#
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config BINARY_PRINTF
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def_bool n
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menu "Library routines"
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config RAID6_PQ
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tristate
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config BITREVERSE
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tristate
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config HAVE_ARCH_BITREVERSE
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bool
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default n
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depends on BITREVERSE
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help
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This option enables the use of hardware bit-reversal instructions on
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architectures which support such operations.
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config RATIONAL
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bool
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config GENERIC_STRNCPY_FROM_USER
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bool
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config GENERIC_STRNLEN_USER
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bool
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config GENERIC_NET_UTILS
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bool
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config GENERIC_FIND_FIRST_BIT
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bool
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config NO_GENERIC_PCI_IOPORT_MAP
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bool
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config GENERIC_PCI_IOMAP
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bool
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config GENERIC_IOMAP
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bool
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select GENERIC_PCI_IOMAP
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config STMP_DEVICE
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bool
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config ARCH_USE_CMPXCHG_LOCKREF
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bool
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config ARCH_HAS_FAST_MULTIPLIER
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bool
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config INDIRECT_PIO
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bool "Access I/O in non-MMIO mode"
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depends on ARM64
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help
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On some platforms where no separate I/O space exists, there are I/O
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hosts which can not be accessed in MMIO mode. Using the logical PIO
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mechanism, the host-local I/O resource can be mapped into system
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logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
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system can access the I/O devices with the mapped-logic PIO through
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I/O accessors.
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This way has relatively little I/O performance cost. Please make
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sure your devices really need this configure item enabled.
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When in doubt, say N.
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config CRC_CCITT
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tristate "CRC-CCITT functions"
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help
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This option is provided for the case where no in-kernel-tree
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modules require CRC-CCITT functions, but a module built outside
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the kernel tree does. Such modules that use library CRC-CCITT
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functions require M here.
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config CRC16
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tristate "CRC16 functions"
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help
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This option is provided for the case where no in-kernel-tree
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modules require CRC16 functions, but a module built outside
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the kernel tree does. Such modules that use library CRC16
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functions require M here.
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config CRC_T10DIF
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tristate "CRC calculation for the T10 Data Integrity Field"
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select CRYPTO
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select CRYPTO_CRCT10DIF
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help
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This option is only needed if a module that's not in the
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kernel tree needs to calculate CRC checks for use with the
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SCSI data integrity subsystem.
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config CRC_ITU_T
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tristate "CRC ITU-T V.41 functions"
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help
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This option is provided for the case where no in-kernel-tree
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modules require CRC ITU-T V.41 functions, but a module built outside
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the kernel tree does. Such modules that use library CRC ITU-T V.41
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functions require M here.
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config CRC32
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tristate "CRC32/CRC32c functions"
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default y
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select BITREVERSE
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help
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This option is provided for the case where no in-kernel-tree
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modules require CRC32/CRC32c functions, but a module built outside
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the kernel tree does. Such modules that use library CRC32/CRC32c
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functions require M here.
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config CRC32_SELFTEST
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tristate "CRC32 perform self test on init"
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depends on CRC32
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help
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This option enables the CRC32 library functions to perform a
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self test on initialization. The self test computes crc32_le
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and crc32_be over byte strings with random alignment and length
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and computes the total elapsed time and number of bytes processed.
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choice
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prompt "CRC32 implementation"
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depends on CRC32
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default CRC32_SLICEBY8
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help
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This option allows a kernel builder to override the default choice
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of CRC32 algorithm. Choose the default ("slice by 8") unless you
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know that you need one of the others.
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config CRC32_SLICEBY8
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bool "Slice by 8 bytes"
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help
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Calculate checksum 8 bytes at a time with a clever slicing algorithm.
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This is the fastest algorithm, but comes with a 8KiB lookup table.
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Most modern processors have enough cache to hold this table without
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thrashing the cache.
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This is the default implementation choice. Choose this one unless
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you have a good reason not to.
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config CRC32_SLICEBY4
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bool "Slice by 4 bytes"
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help
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Calculate checksum 4 bytes at a time with a clever slicing algorithm.
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This is a bit slower than slice by 8, but has a smaller 4KiB lookup
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table.
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Only choose this option if you know what you are doing.
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config CRC32_SARWATE
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bool "Sarwate's Algorithm (one byte at a time)"
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help
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Calculate checksum a byte at a time using Sarwate's algorithm. This
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is not particularly fast, but has a small 256 byte lookup table.
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Only choose this option if you know what you are doing.
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config CRC32_BIT
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bool "Classic Algorithm (one bit at a time)"
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help
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Calculate checksum one bit at a time. This is VERY slow, but has
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no lookup table. This is provided as a debugging option.
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Only choose this option if you are debugging crc32.
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endchoice
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config CRC64
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tristate "CRC64 functions"
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help
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This option is provided for the case where no in-kernel-tree
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modules require CRC64 functions, but a module built outside
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the kernel tree does. Such modules that use library CRC64
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functions require M here.
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config CRC4
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tristate "CRC4 functions"
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help
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This option is provided for the case where no in-kernel-tree
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modules require CRC4 functions, but a module built outside
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the kernel tree does. Such modules that use library CRC4
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functions require M here.
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config CRC7
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tristate "CRC7 functions"
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help
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This option is provided for the case where no in-kernel-tree
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modules require CRC7 functions, but a module built outside
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the kernel tree does. Such modules that use library CRC7
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functions require M here.
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config LIBCRC32C
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tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
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select CRYPTO
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select CRYPTO_CRC32C
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help
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This option is provided for the case where no in-kernel-tree
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modules require CRC32c functions, but a module built outside the
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kernel tree does. Such modules that use library CRC32c functions
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require M here. See Castagnoli93.
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Module will be libcrc32c.
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config CRC8
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tristate "CRC8 function"
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help
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This option provides CRC8 function. Drivers may select this
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when they need to do cyclic redundancy check according CRC8
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algorithm. Module will be called crc8.
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config XXHASH
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tristate
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config AUDIT_GENERIC
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bool
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depends on AUDIT && !AUDIT_ARCH
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default y
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config AUDIT_ARCH_COMPAT_GENERIC
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bool
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default n
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config AUDIT_COMPAT_GENERIC
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bool
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depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
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default y
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config RANDOM32_SELFTEST
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bool "PRNG perform self test on init"
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help
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This option enables the 32 bit PRNG library functions to perform a
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self test on initialization.
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#
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# compression support is select'ed if needed
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#
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config 842_COMPRESS
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select CRC32
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tristate
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config 842_DECOMPRESS
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select CRC32
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tristate
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config ZLIB_INFLATE
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tristate
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config ZLIB_DEFLATE
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tristate
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select BITREVERSE
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config LZO_COMPRESS
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tristate
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config LZO_DECOMPRESS
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tristate
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config LZ4_COMPRESS
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tristate
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config LZ4HC_COMPRESS
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tristate
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config LZ4_DECOMPRESS
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tristate
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config ZSTD_COMPRESS
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select XXHASH
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tristate
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config ZSTD_DECOMPRESS
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select XXHASH
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tristate
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source "lib/xz/Kconfig"
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#
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# These all provide a common interface (hence the apparent duplication with
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# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
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#
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config DECOMPRESS_GZIP
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select ZLIB_INFLATE
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tristate
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config DECOMPRESS_BZIP2
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tristate
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config DECOMPRESS_LZMA
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tristate
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config DECOMPRESS_XZ
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select XZ_DEC
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tristate
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config DECOMPRESS_LZO
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select LZO_DECOMPRESS
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tristate
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config DECOMPRESS_LZ4
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select LZ4_DECOMPRESS
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tristate
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#
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# Generic allocator support is selected if needed
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#
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config GENERIC_ALLOCATOR
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bool
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#
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# reed solomon support is select'ed if needed
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#
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config REED_SOLOMON
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tristate
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config REED_SOLOMON_ENC8
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bool
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config REED_SOLOMON_DEC8
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bool
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config REED_SOLOMON_ENC16
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bool
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config REED_SOLOMON_DEC16
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bool
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#
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# BCH support is selected if needed
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#
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config BCH
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tristate
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config BCH_CONST_PARAMS
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bool
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help
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Drivers may select this option to force specific constant
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values for parameters 'm' (Galois field order) and 't'
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(error correction capability). Those specific values must
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be set by declaring default values for symbols BCH_CONST_M
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and BCH_CONST_T.
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Doing so will enable extra compiler optimizations,
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improving encoding and decoding performance up to 2x for
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usual (m,t) values (typically such that m*t < 200).
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When this option is selected, the BCH library supports
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only a single (m,t) configuration. This is mainly useful
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for NAND flash board drivers requiring known, fixed BCH
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parameters.
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config BCH_CONST_M
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int
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range 5 15
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help
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Constant value for Galois field order 'm'. If 'k' is the
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number of data bits to protect, 'm' should be chosen such
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that (k + m*t) <= 2**m - 1.
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Drivers should declare a default value for this symbol if
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they select option BCH_CONST_PARAMS.
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config BCH_CONST_T
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int
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help
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Constant value for error correction capability in bits 't'.
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Drivers should declare a default value for this symbol if
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they select option BCH_CONST_PARAMS.
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#
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# Textsearch support is select'ed if needed
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#
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config TEXTSEARCH
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bool
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config TEXTSEARCH_KMP
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tristate
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config TEXTSEARCH_BM
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tristate
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config TEXTSEARCH_FSM
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tristate
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config BTREE
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bool
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config INTERVAL_TREE
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bool
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help
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Simple, embeddable, interval-tree. Can find the start of an
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overlapping range in log(n) time and then iterate over all
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overlapping nodes. The algorithm is implemented as an
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augmented rbtree.
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See:
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Documentation/rbtree.txt
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for more information.
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config XARRAY_MULTI
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bool
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help
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Support entries which occupy multiple consecutive indices in the
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XArray.
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config ASSOCIATIVE_ARRAY
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bool
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help
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Generic associative array. Can be searched and iterated over whilst
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it is being modified. It is also reasonably quick to search and
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modify. The algorithms are non-recursive, and the trees are highly
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capacious.
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See:
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Documentation/core-api/assoc_array.rst
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for more information.
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config HAS_IOMEM
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bool
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depends on !NO_IOMEM
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select GENERIC_IO
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default y
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config HAS_IOPORT_MAP
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bool
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depends on HAS_IOMEM && !NO_IOPORT_MAP
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default y
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source "kernel/dma/Kconfig"
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config SGL_ALLOC
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bool
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default n
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config IOMMU_HELPER
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bool
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config CHECK_SIGNATURE
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bool
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config CPUMASK_OFFSTACK
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bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
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help
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Use dynamic allocation for cpumask_var_t, instead of putting
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them on the stack. This is a bit more expensive, but avoids
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stack overflow.
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config CPU_RMAP
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bool
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depends on SMP
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config DQL
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bool
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config GLOB
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bool
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# This actually supports modular compilation, but the module overhead
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# is ridiculous for the amount of code involved. Until an out-of-tree
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# driver asks for it, we'll just link it directly it into the kernel
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# when required. Since we're ignoring out-of-tree users, there's also
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# no need bother prompting for a manual decision:
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# prompt "glob_match() function"
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help
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This option provides a glob_match function for performing
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simple text pattern matching. It originated in the ATA code
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to blacklist particular drive models, but other device drivers
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may need similar functionality.
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All drivers in the Linux kernel tree that require this function
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should automatically select this option. Say N unless you
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are compiling an out-of tree driver which tells you that it
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depends on this.
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config GLOB_SELFTEST
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tristate "glob self-test on init"
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depends on GLOB
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help
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This option enables a simple self-test of the glob_match
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function on startup. It is primarily useful for people
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working on the code to ensure they haven't introduced any
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regressions.
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It only adds a little bit of code and slows kernel boot (or
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module load) by a small amount, so you're welcome to play with
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it, but you probably don't need it.
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#
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# Netlink attribute parsing support is select'ed if needed
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#
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config NLATTR
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bool
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#
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# Generic 64-bit atomic support is selected if needed
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#
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config GENERIC_ATOMIC64
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bool
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config LRU_CACHE
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tristate
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config CLZ_TAB
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bool
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config CORDIC
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tristate "CORDIC algorithm"
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help
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This option provides an implementation of the CORDIC algorithm;
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calculations are in fixed point. Module will be called cordic.
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config DDR
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bool "JEDEC DDR data"
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help
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Data from JEDEC specs for DDR SDRAM memories,
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particularly the AC timing parameters and addressing
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information. This data is useful for drivers handling
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DDR SDRAM controllers.
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config IRQ_POLL
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bool "IRQ polling library"
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help
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Helper library to poll interrupt mitigation using polling.
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config MPILIB
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tristate
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select CLZ_TAB
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help
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Multiprecision maths library from GnuPG.
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It is used to implement RSA digital signature verification,
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which is used by IMA/EVM digital signature extension.
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config SIGNATURE
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tristate
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depends on KEYS
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select CRYPTO
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select CRYPTO_SHA1
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select MPILIB
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help
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Digital signature verification. Currently only RSA is supported.
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Implementation is done using GnuPG MPI library
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#
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# libfdt files, only selected if needed.
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#
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config LIBFDT
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bool
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config OID_REGISTRY
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tristate
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help
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Enable fast lookup object identifier registry.
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config UCS2_STRING
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tristate
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source "lib/fonts/Kconfig"
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config SG_SPLIT
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def_bool n
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help
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Provides a helper to split scatterlists into chunks, each chunk being
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a scatterlist. This should be selected by a driver or an API which
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whishes to split a scatterlist amongst multiple DMA channels.
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config SG_POOL
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def_bool n
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help
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Provides a helper to allocate chained scatterlists. This should be
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selected by a driver or an API which whishes to allocate chained
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scatterlist.
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#
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# sg chaining option
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#
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config ARCH_HAS_SG_CHAIN
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def_bool n
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config ARCH_HAS_PMEM_API
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bool
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config ARCH_HAS_UACCESS_FLUSHCACHE
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bool
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config ARCH_HAS_UACCESS_MCSAFE
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bool
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config STACKDEPOT
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bool
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select STACKTRACE
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config SBITMAP
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bool
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config PARMAN
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tristate "parman" if COMPILE_TEST
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config PRIME_NUMBERS
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tristate
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config STRING_SELFTEST
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tristate "Test string functions"
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endmenu
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config GENERIC_LIB_ASHLDI3
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bool
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config GENERIC_LIB_ASHRDI3
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bool
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config GENERIC_LIB_LSHRDI3
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bool
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config GENERIC_LIB_MULDI3
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bool
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config GENERIC_LIB_CMPDI2
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bool
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config GENERIC_LIB_UCMPDI2
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bool
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