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Merge tag 'bitmap-5.17-rc1' of git://github.com/norov/linux
Pull bitmap updates from Yury Norov:
- introduce for_each_set_bitrange()
- use find_first_*_bit() instead of find_next_*_bit() where possible
- unify for_each_bit() macros
* tag 'bitmap-5.17-rc1' of git://github.com/norov/linux:
vsprintf: rework bitmap_list_string
lib: bitmap: add performance test for bitmap_print_to_pagebuf
bitmap: unify find_bit operations
mm/percpu: micro-optimize pcpu_is_populated()
Replace for_each_*_bit_from() with for_each_*_bit() where appropriate
find: micro-optimize for_each_{set,clear}_bit()
include/linux: move for_each_bit() macros from bitops.h to find.h
cpumask: replace cpumask_next_* with cpumask_first_* where appropriate
tools: sync tools/bitmap with mother linux
all: replace find_next{,_zero}_bit with find_first{,_zero}_bit where appropriate
cpumask: use find_first_and_bit()
lib: add find_first_and_bit()
arch: remove GENERIC_FIND_FIRST_BIT entirely
include: move find.h from asm_generic to linux
bitops: move find_bit_*_le functions from le.h to find.h
bitops: protect find_first_{,zero}_bit properly
732 lines
16 KiB
Plaintext
732 lines
16 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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#
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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 RAID6_PQ_BENCHMARK
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bool "Automatically choose fastest RAID6 PQ functions"
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depends on RAID6_PQ
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default y
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help
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Benchmark all available RAID6 PQ functions on init and choose the
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fastest one.
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config LINEAR_RANGES
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tristate
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config PACKING
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bool "Generic bitfield packing and unpacking"
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default n
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help
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This option provides the packing() helper function, which permits
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converting bitfields between a CPU-usable representation and a
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memory representation that can have any combination of these quirks:
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- Is little endian (bytes are reversed within a 32-bit group)
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- The least-significant 32-bit word comes first (within a 64-bit
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group)
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- The most significant bit of a byte is at its right (bit 0 of a
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register description is numerically 2^7).
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Drivers may use these helpers to match the bit indices as described
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in the data sheets of the peripherals they are in control of.
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When in doubt, say N.
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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 ARCH_HAS_STRNCPY_FROM_USER
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bool
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config ARCH_HAS_STRNLEN_USER
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bool
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config GENERIC_STRNCPY_FROM_USER
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def_bool !ARCH_HAS_STRNCPY_FROM_USER
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config GENERIC_STRNLEN_USER
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def_bool !ARCH_HAS_STRNLEN_USER
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config GENERIC_NET_UTILS
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bool
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source "lib/math/Kconfig"
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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 ARCH_USE_SYM_ANNOTATIONS
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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 INDIRECT_IOMEM
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bool
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help
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This is selected by other options/architectures to provide the
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emulated iomem accessors.
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config INDIRECT_IOMEM_FALLBACK
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bool
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depends on INDIRECT_IOMEM
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help
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If INDIRECT_IOMEM is selected, this enables falling back to plain
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mmio accesses when the IO memory address is not a registered
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emulated region.
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source "lib/crypto/Kconfig"
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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 ZLIB_DFLTCC
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def_bool y
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depends on S390
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prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
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help
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Enable s390x hardware support for zlib in the kernel.
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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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config DECOMPRESS_ZSTD
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select ZSTD_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/core-api/rbtree.rst
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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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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
|
|
function on startup. It is primarily useful for people
|
|
working on the code to ensure they haven't introduced any
|
|
regressions.
|
|
|
|
It only adds a little bit of code and slows kernel boot (or
|
|
module load) by a small amount, so you're welcome to play with
|
|
it, but you probably don't need it.
|
|
|
|
#
|
|
# 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 LRU_CACHE
|
|
tristate
|
|
|
|
config CLZ_TAB
|
|
bool
|
|
|
|
config IRQ_POLL
|
|
bool "IRQ polling library"
|
|
help
|
|
Helper library to poll interrupt mitigation using polling.
|
|
|
|
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
|
|
select CRYPTO
|
|
select CRYPTO_SHA1
|
|
select MPILIB
|
|
help
|
|
Digital signature verification. Currently only RSA is supported.
|
|
Implementation is done using GnuPG MPI library
|
|
|
|
config DIMLIB
|
|
bool
|
|
help
|
|
Dynamic Interrupt Moderation library.
|
|
Implements an algorithm for dynamically changing CQ moderation values
|
|
according to run time performance.
|
|
|
|
#
|
|
# libfdt files, only selected if needed.
|
|
#
|
|
config LIBFDT
|
|
bool
|
|
|
|
config OID_REGISTRY
|
|
tristate
|
|
help
|
|
Enable fast lookup object identifier registry.
|
|
|
|
config UCS2_STRING
|
|
tristate
|
|
|
|
#
|
|
# generic vdso
|
|
#
|
|
source "lib/vdso/Kconfig"
|
|
|
|
source "lib/fonts/Kconfig"
|
|
|
|
config SG_SPLIT
|
|
def_bool n
|
|
help
|
|
Provides a helper to split scatterlists into chunks, each chunk being
|
|
a scatterlist. This should be selected by a driver or an API which
|
|
whishes to split a scatterlist amongst multiple DMA channels.
|
|
|
|
config SG_POOL
|
|
def_bool n
|
|
help
|
|
Provides a helper to allocate chained scatterlists. This should be
|
|
selected by a driver or an API which whishes to allocate chained
|
|
scatterlist.
|
|
|
|
#
|
|
# sg chaining option
|
|
#
|
|
|
|
config ARCH_NO_SG_CHAIN
|
|
def_bool n
|
|
|
|
config ARCH_HAS_PMEM_API
|
|
bool
|
|
|
|
config MEMREGION
|
|
bool
|
|
|
|
config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
|
|
bool
|
|
|
|
# use memcpy to implement user copies for nommu architectures
|
|
config UACCESS_MEMCPY
|
|
bool
|
|
|
|
config ARCH_HAS_UACCESS_FLUSHCACHE
|
|
bool
|
|
|
|
# arch has a concept of a recoverable synchronous exception due to a
|
|
# memory-read error like x86 machine-check or ARM data-abort, and
|
|
# implements copy_mc_to_{user,kernel} to abort and report
|
|
# 'bytes-transferred' if that exception fires when accessing the source
|
|
# buffer.
|
|
config ARCH_HAS_COPY_MC
|
|
bool
|
|
|
|
# Temporary. Goes away when all archs are cleaned up
|
|
config ARCH_STACKWALK
|
|
bool
|
|
|
|
config STACKDEPOT
|
|
bool
|
|
select STACKTRACE
|
|
|
|
config STACKDEPOT_ALWAYS_INIT
|
|
bool
|
|
select STACKDEPOT
|
|
|
|
config STACK_HASH_ORDER
|
|
int "stack depot hash size (12 => 4KB, 20 => 1024KB)"
|
|
range 12 20
|
|
default 20
|
|
depends on STACKDEPOT
|
|
help
|
|
Select the hash size as a power of 2 for the stackdepot hash table.
|
|
Choose a lower value to reduce the memory impact.
|
|
|
|
config REF_TRACKER
|
|
bool
|
|
depends on STACKTRACE_SUPPORT
|
|
select STACKDEPOT
|
|
|
|
config SBITMAP
|
|
bool
|
|
|
|
config PARMAN
|
|
tristate "parman" if COMPILE_TEST
|
|
|
|
config OBJAGG
|
|
tristate "objagg" if COMPILE_TEST
|
|
|
|
endmenu
|
|
|
|
config GENERIC_IOREMAP
|
|
bool
|
|
|
|
config GENERIC_LIB_ASHLDI3
|
|
bool
|
|
|
|
config GENERIC_LIB_ASHRDI3
|
|
bool
|
|
|
|
config GENERIC_LIB_LSHRDI3
|
|
bool
|
|
|
|
config GENERIC_LIB_MULDI3
|
|
bool
|
|
|
|
config GENERIC_LIB_CMPDI2
|
|
bool
|
|
|
|
config GENERIC_LIB_UCMPDI2
|
|
bool
|
|
|
|
config GENERIC_LIB_DEVMEM_IS_ALLOWED
|
|
bool
|
|
|
|
config PLDMFW
|
|
bool
|
|
default n
|
|
|
|
config ASN1_ENCODER
|
|
tristate
|