1# SPDX-License-Identifier: GPL-2.0-only 2 3# Kconfig for the kernel's cyclic redundancy check (CRC) library code 4 5config CRC4 6 tristate 7 help 8 The CRC4 library functions. Select this if your module uses any of 9 the functions from <linux/crc4.h>. 10 11config CRC7 12 tristate 13 help 14 The CRC7 library functions. Select this if your module uses any of 15 the functions from <linux/crc7.h>. 16 17config CRC8 18 tristate 19 help 20 The CRC8 library functions. Select this if your module uses any of 21 the functions from <linux/crc8.h>. 22 23config CRC16 24 tristate 25 help 26 The CRC16 library functions. Select this if your module uses any of 27 the functions from <linux/crc16.h>. 28 29config CRC_CCITT 30 tristate 31 help 32 The CRC-CCITT library functions. Select this if your module uses any 33 of the functions from <linux/crc-ccitt.h>. 34 35config CRC_ITU_T 36 tristate 37 help 38 The CRC-ITU-T library functions. Select this if your module uses 39 any of the functions from <linux/crc-itu-t.h>. 40 41config CRC_T10DIF 42 tristate 43 help 44 The CRC-T10DIF library functions. Select this if your module uses 45 any of the functions from <linux/crc-t10dif.h>. 46 47config ARCH_HAS_CRC_T10DIF 48 bool 49 50config CRC_T10DIF_ARCH 51 bool 52 depends on CRC_T10DIF && CRC_OPTIMIZATIONS 53 default y if ARM && KERNEL_MODE_NEON 54 default y if ARM64 && KERNEL_MODE_NEON 55 default y if PPC64 && ALTIVEC 56 default y if RISCV && RISCV_ISA_ZBC 57 58config CRC32 59 tristate 60 select BITREVERSE 61 help 62 The CRC32 library functions. Select this if your module uses any of 63 the functions from <linux/crc32.h> or <linux/crc32c.h>. 64 65config ARCH_HAS_CRC32 66 bool 67 68config CRC32_ARCH 69 bool 70 depends on CRC32 && CRC_OPTIMIZATIONS 71 default y if ARM && KERNEL_MODE_NEON 72 default y if ARM64 73 default y if LOONGARCH 74 default y if MIPS && CPU_MIPSR6 75 default y if PPC64 && ALTIVEC 76 default y if RISCV && RISCV_ISA_ZBC 77 default y if S390 78 79config CRC64 80 tristate 81 help 82 The CRC64 library functions. Select this if your module uses any of 83 the functions from <linux/crc64.h>. 84 85config ARCH_HAS_CRC64 86 bool 87 88config CRC64_ARCH 89 bool 90 depends on CRC64 && CRC_OPTIMIZATIONS 91 default y if RISCV && RISCV_ISA_ZBC && 64BIT 92 93config CRC_OPTIMIZATIONS 94 bool "Enable optimized CRC implementations" if EXPERT 95 depends on !UML 96 default y 97 help 98 Disabling this option reduces code size slightly by disabling the 99 architecture-optimized implementations of any CRC variants that are 100 enabled. CRC checksumming performance may get much slower. 101 102 Keep this enabled unless you're really trying to minimize the size of 103 the kernel. 104 105config CRC_KUNIT_TEST 106 tristate "KUnit tests for CRC functions" if !KUNIT_ALL_TESTS 107 depends on KUNIT 108 default KUNIT_ALL_TESTS 109 select CRC7 110 select CRC16 111 select CRC_T10DIF 112 select CRC32 113 select CRC64 114 help 115 Unit tests for the CRC library functions. 116 117 This is intended to help people writing architecture-specific 118 optimized versions. If unsure, say N. 119 120config CRC_BENCHMARK 121 bool "Benchmark for the CRC functions" 122 depends on CRC_KUNIT_TEST 123 help 124 Include benchmarks in the KUnit test suite for the CRC functions. 125