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703 lines
16 KiB
703 lines
16 KiB
# 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 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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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 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 |
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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 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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config DIMLIB |
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bool |
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help |
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Dynamic Interrupt Moderation library. |
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Implements an algorithm for dynamically changing CQ moderation values |
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according to run time performance. |
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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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# |
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# generic vdso |
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# |
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source "lib/vdso/Kconfig" |
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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_NO_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 MEMREGION |
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bool |
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config ARCH_HAS_MEMREMAP_COMPAT_ALIGN |
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bool |
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# use memcpy to implement user copies for nommu architectures |
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config UACCESS_MEMCPY |
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bool |
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config ARCH_HAS_UACCESS_FLUSHCACHE |
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bool |
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# arch has a concept of a recoverable synchronous exception due to a |
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# memory-read error like x86 machine-check or ARM data-abort, and |
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# implements copy_mc_to_{user,kernel} to abort and report |
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# 'bytes-transferred' if that exception fires when accessing the source |
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# buffer. |
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config ARCH_HAS_COPY_MC |
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bool |
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# Temporary. Goes away when all archs are cleaned up |
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config ARCH_STACKWALK |
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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 STACK_HASH_ORDER |
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int "stack depot hash size (12 => 4KB, 20 => 1024KB)" |
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range 12 20 |
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default 20 |
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depends on STACKDEPOT |
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help |
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Select the hash size as a power of 2 for the stackdepot hash table. |
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Choose a lower value to reduce the memory impact. |
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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 OBJAGG |
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tristate "objagg" if COMPILE_TEST |
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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_IOREMAP |
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bool |
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config GENERIC_LIB_ASHLDI3 |
|
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 |
|
bool |
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config GENERIC_LIB_CMPDI2 |
|
bool |
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config GENERIC_LIB_UCMPDI2 |
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bool |
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config GENERIC_LIB_DEVMEM_IS_ALLOWED |
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bool |
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config PLDMFW |
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bool |
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default n
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