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CRC updates for 6.16 

Cleanups for the kernel's CRC (cyclic redundancy check) code:
 
 - Use __ro_after_init where appropriate
 - Remove unnecessary static_key on s390
 - Rename some source code files
 - Rename the crc32 and crc32c crypto API modules
 - Use subsys_initcall instead of arch_initcall
 - Restore maintainers for crc_kunit.c
 - Fold crc16_byte() into crc16.c
 - Add some SPDX license identifiers
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 Z29vZ2xlLmNvbQAKCRDzXCl4vpKOKz0tAQCDqDA4Jd/54nnKpChMlKH8MTQDuwfz
 8GHZi50mn4Rw5gD/f+hOGItPfswBId/+MZy+rKWL7bE2e9DdJdtoqRRtwA4=
 =RWFl
 -----END PGP SIGNATURE-----

Merge tag 'crc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux

Pull CRC updates from Eric Biggers:
 "Cleanups for the kernel's CRC (cyclic redundancy check) code:

   - Use __ro_after_init where appropriate

   - Remove unnecessary static_key on s390

   - Rename some source code files

   - Rename the crc32 and crc32c crypto API modules

   - Use subsys_initcall instead of arch_initcall

   - Restore maintainers for crc_kunit.c

   - Fold crc16_byte() into crc16.c

   - Add some SPDX license identifiers"

* tag 'crc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux:
  lib/crc32: add SPDX license identifier
  lib/crc16: unexport crc16_table and crc16_byte()
  w1: ds2406: use crc16() instead of crc16_byte() loop
  MAINTAINERS: add crc_kunit.c back to CRC LIBRARY
  lib/crc: make arch-optimized code use subsys_initcall
  crypto: crc32 - remove "generic" from file and module names
  x86/crc: drop "glue" from filenames
  sparc/crc: drop "glue" from filenames
  s390/crc: drop "glue" from filenames
  powerpc/crc: rename crc32-vpmsum_core.S to crc-vpmsum-template.S
  powerpc/crc: drop "glue" from filenames
  arm64/crc: drop "glue" from filenames
  arm/crc: drop "glue" from filenames
  s390/crc32: Remove no-op module init and exit functions
  s390/crc32: Remove have_vxrs static key
  lib/crc: make the CPU feature static keys __ro_after_init
This commit is contained in:
Linus Torvalds 2025-05-26 13:32:06 -07:00
parent 14f19dc644 289c99bec7
commit 15d90a5e55
32 changed files with 59 additions and 92 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
MAINTAINERS
View File

@ -6263,6 +6263,7 @@ F: Documentation/staging/crc*
F: arch/*/lib/crc*
F: include/linux/crc*
F: lib/crc*
F: lib/tests/crc_kunit.c
F: scripts/gen-crc-consts.py
CREATIVE SB0540

4
arch/arm/lib/Makefile
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@ -47,7 +47,7 @@ endif
obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
obj-$(CONFIG_CRC32_ARCH) += crc32-arm.o
crc32-arm-y := crc32-glue.o crc32-core.o
crc32-arm-y := crc32.o crc32-core.o
obj-$(CONFIG_CRC_T10DIF_ARCH) += crc-t10dif-arm.o
crc-t10dif-arm-y := crc-t10dif-glue.o crc-t10dif-core.o
crc-t10dif-arm-y := crc-t10dif.o crc-t10dif-core.o

6
arch/arm/lib/crc-t10dif-glue.c → arch/arm/lib/crc-t10dif.c
View File

@ -16,8 +16,8 @@
#include <asm/neon.h>
#include <asm/simd.h>
static DEFINE_STATIC_KEY_FALSE(have_neon);
static DEFINE_STATIC_KEY_FALSE(have_pmull);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pmull);
#define CRC_T10DIF_PMULL_CHUNK_SIZE 16U
@ -60,7 +60,7 @@ static int __init crc_t10dif_arm_init(void)
}
return 0;
}
arch_initcall(crc_t10dif_arm_init);
subsys_initcall(crc_t10dif_arm_init);
static void __exit crc_t10dif_arm_exit(void)
{

6
arch/arm/lib/crc32-glue.c → arch/arm/lib/crc32.c
View File

@ -18,8 +18,8 @@
#include <asm/neon.h>
#include <asm/simd.h>
static DEFINE_STATIC_KEY_FALSE(have_crc32);
static DEFINE_STATIC_KEY_FALSE(have_pmull);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_crc32);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pmull);
#define PMULL_MIN_LEN 64 /* min size of buffer for pmull functions */
@ -103,7 +103,7 @@ static int __init crc32_arm_init(void)
static_branch_enable(&have_pmull);
return 0;
}
arch_initcall(crc32_arm_init);
subsys_initcall(crc32_arm_init);
static void __exit crc32_arm_exit(void)
{

4
arch/arm64/lib/Makefile
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@ -14,10 +14,10 @@ endif
lib-$(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) += uaccess_flushcache.o
obj-$(CONFIG_CRC32_ARCH) += crc32-arm64.o
crc32-arm64-y := crc32.o crc32-glue.o
crc32-arm64-y := crc32.o crc32-core.o
obj-$(CONFIG_CRC_T10DIF_ARCH) += crc-t10dif-arm64.o
crc-t10dif-arm64-y := crc-t10dif-glue.o crc-t10dif-core.o
crc-t10dif-arm64-y := crc-t10dif.o crc-t10dif-core.o
obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o

6
arch/arm64/lib/crc-t10dif-glue.c → arch/arm64/lib/crc-t10dif.c
View File

@ -17,8 +17,8 @@
#include <asm/neon.h>
#include <asm/simd.h>
static DEFINE_STATIC_KEY_FALSE(have_asimd);
static DEFINE_STATIC_KEY_FALSE(have_pmull);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_asimd);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pmull);
#define CRC_T10DIF_PMULL_CHUNK_SIZE 16U
@ -61,7 +61,7 @@ static int __init crc_t10dif_arm64_init(void)
}
return 0;
}
arch_initcall(crc_t10dif_arm64_init);
subsys_initcall(crc_t10dif_arm64_init);
static void __exit crc_t10dif_arm64_exit(void)
{

0
arch/arm64/lib/crc32.S → arch/arm64/lib/crc32-core.S
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0
arch/arm64/lib/crc32-glue.c → arch/arm64/lib/crc32.c
View File

4
arch/loongarch/lib/crc32-loongarch.c
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@ -26,7 +26,7 @@ do { \
#define CRC32(crc, value, size) _CRC32(crc, value, size, crc)
#define CRC32C(crc, value, size) _CRC32(crc, value, size, crcc)
static DEFINE_STATIC_KEY_FALSE(have_crc32);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_crc32);
u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
{
@ -114,7 +114,7 @@ static int __init crc32_loongarch_init(void)
static_branch_enable(&have_crc32);
return 0;
}
arch_initcall(crc32_loongarch_init);
subsys_initcall(crc32_loongarch_init);
static void __exit crc32_loongarch_exit(void)
{

4
arch/mips/lib/crc32-mips.c
View File

@ -62,7 +62,7 @@ do { \
#define CRC32C(crc, value, size) \
_CRC32(crc, value, size, crc32c)
static DEFINE_STATIC_KEY_FALSE(have_crc32);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_crc32);
u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
{
@ -163,7 +163,7 @@ static int __init crc32_mips_init(void)
static_branch_enable(&have_crc32);
return 0;
}
arch_initcall(crc32_mips_init);
subsys_initcall(crc32_mips_init);
static void __exit crc32_mips_exit(void)
{

4
arch/powerpc/lib/Makefile
View File

@ -79,9 +79,9 @@ CFLAGS_xor_vmx.o += -mhard-float -maltivec $(call cc-option,-mabi=altivec)
CFLAGS_xor_vmx.o += -isystem $(shell $(CC) -print-file-name=include)
obj-$(CONFIG_CRC32_ARCH) += crc32-powerpc.o
crc32-powerpc-y := crc32-glue.o crc32c-vpmsum_asm.o
crc32-powerpc-y := crc32.o crc32c-vpmsum_asm.o
obj-$(CONFIG_CRC_T10DIF_ARCH) += crc-t10dif-powerpc.o
crc-t10dif-powerpc-y := crc-t10dif-glue.o crct10dif-vpmsum_asm.o
crc-t10dif-powerpc-y := crc-t10dif.o crct10dif-vpmsum_asm.o
obj-$(CONFIG_PPC64) += $(obj64-y)

4
arch/powerpc/lib/crc-t10dif-glue.c → arch/powerpc/lib/crc-t10dif.c
View File

@ -21,7 +21,7 @@
#define VECTOR_BREAKPOINT 64
static DEFINE_STATIC_KEY_FALSE(have_vec_crypto);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_vec_crypto);
u32 __crct10dif_vpmsum(u32 crc, unsigned char const *p, size_t len);
@ -71,7 +71,7 @@ static int __init crc_t10dif_powerpc_init(void)
static_branch_enable(&have_vec_crypto);
return 0;
}
arch_initcall(crc_t10dif_powerpc_init);
subsys_initcall(crc_t10dif_powerpc_init);
static void __exit crc_t10dif_powerpc_exit(void)
{

0
arch/powerpc/lib/crc32-vpmsum_core.S → arch/powerpc/lib/crc-vpmsum-template.S
View File

4
arch/powerpc/lib/crc32-glue.c → arch/powerpc/lib/crc32.c
View File

@ -13,7 +13,7 @@
#define VECTOR_BREAKPOINT 512
static DEFINE_STATIC_KEY_FALSE(have_vec_crypto);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_vec_crypto);
u32 __crc32c_vpmsum(u32 crc, const u8 *p, size_t len);
@ -72,7 +72,7 @@ static int __init crc32_powerpc_init(void)
static_branch_enable(&have_vec_crypto);
return 0;
}
arch_initcall(crc32_powerpc_init);
subsys_initcall(crc32_powerpc_init);
static void __exit crc32_powerpc_exit(void)
{

2
arch/powerpc/lib/crc32c-vpmsum_asm.S
View File

@ -839,4 +839,4 @@
#define CRC_FUNCTION_NAME __crc32c_vpmsum
#define REFLECT
#include "crc32-vpmsum_core.S"
#include "crc-vpmsum-template.S"

2
arch/powerpc/lib/crct10dif-vpmsum_asm.S
View File

@ -842,4 +842,4 @@
.octa 0x0000000000000000000000018bb70000
#define CRC_FUNCTION_NAME __crct10dif_vpmsum
#include "crc32-vpmsum_core.S"
#include "crc-vpmsum-template.S"

2
arch/s390/lib/Makefile
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@ -26,4 +26,4 @@ lib-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
obj-$(CONFIG_EXPOLINE_EXTERN) += expoline.o
obj-$(CONFIG_CRC32_ARCH) += crc32-s390.o
crc32-s390-y := crc32-glue.o crc32le-vx.o crc32be-vx.o
crc32-s390-y := crc32.o crc32le-vx.o crc32be-vx.o

21
arch/s390/lib/crc32-glue.c → arch/s390/lib/crc32.c
View File

@ -18,8 +18,6 @@
#define VX_ALIGNMENT 16L
#define VX_ALIGN_MASK (VX_ALIGNMENT - 1)
static DEFINE_STATIC_KEY_FALSE(have_vxrs);
/*
* DEFINE_CRC32_VX() - Define a CRC-32 function using the vector extension
*
@ -34,8 +32,7 @@ static DEFINE_STATIC_KEY_FALSE(have_vxrs);
unsigned long prealign, aligned, remaining; \
DECLARE_KERNEL_FPU_ONSTACK16(vxstate); \
\
if (datalen < VX_MIN_LEN + VX_ALIGN_MASK || \
!static_branch_likely(&have_vxrs)) \
if (datalen < VX_MIN_LEN + VX_ALIGN_MASK || !cpu_has_vx()) \
return ___crc32_sw(crc, data, datalen); \
\
if ((unsigned long)data & VX_ALIGN_MASK) { \
@ -64,25 +61,13 @@ DEFINE_CRC32_VX(crc32_le_arch, crc32_le_vgfm_16, crc32_le_base)
DEFINE_CRC32_VX(crc32_be_arch, crc32_be_vgfm_16, crc32_be_base)
DEFINE_CRC32_VX(crc32c_arch, crc32c_le_vgfm_16, crc32c_base)
static int __init crc32_s390_init(void)
{
if (cpu_have_feature(S390_CPU_FEATURE_VXRS))
static_branch_enable(&have_vxrs);
return 0;
}
arch_initcall(crc32_s390_init);
static void __exit crc32_s390_exit(void)
{
}
module_exit(crc32_s390_exit);
u32 crc32_optimizations(void)
{
if (static_key_enabled(&have_vxrs))
if (cpu_has_vx()) {
return CRC32_LE_OPTIMIZATION |
CRC32_BE_OPTIMIZATION |
CRC32C_OPTIMIZATION;
}
return 0;
}
EXPORT_SYMBOL(crc32_optimizations);

2
arch/sparc/lib/Makefile
View File

@ -54,4 +54,4 @@ obj-$(CONFIG_SPARC64) += iomap.o
obj-$(CONFIG_SPARC32) += atomic32.o
obj-$(CONFIG_SPARC64) += PeeCeeI.o
obj-$(CONFIG_CRC32_ARCH) += crc32-sparc.o
crc32-sparc-y := crc32_glue.o crc32c_asm.o
crc32-sparc-y := crc32.o crc32c_asm.o

6
arch/sparc/lib/crc32_glue.c → arch/sparc/lib/crc32.c
View File

@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Glue code for CRC32C optimized for sparc64 crypto opcodes.
/* CRC32c (Castagnoli), sparc64 crc32c opcode accelerated
*
* This is based largely upon arch/x86/crypto/crc32c-intel.c
*
@ -17,7 +17,7 @@
#include <asm/pstate.h>
#include <asm/elf.h>
static DEFINE_STATIC_KEY_FALSE(have_crc32c_opcode);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_crc32c_opcode);
u32 crc32_le_arch(u32 crc, const u8 *data, size_t len)
{
@ -74,7 +74,7 @@ static int __init crc32_sparc_init(void)
pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
return 0;
}
arch_initcall(crc32_sparc_init);
subsys_initcall(crc32_sparc_init);
static void __exit crc32_sparc_exit(void)
{

6
arch/x86/lib/Makefile
View File

@ -39,14 +39,14 @@ lib-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
lib-$(CONFIG_MITIGATION_RETPOLINE) += retpoline.o
obj-$(CONFIG_CRC32_ARCH) += crc32-x86.o
crc32-x86-y := crc32-glue.o crc32-pclmul.o
crc32-x86-y := crc32.o crc32-pclmul.o
crc32-x86-$(CONFIG_64BIT) += crc32c-3way.o
obj-$(CONFIG_CRC64_ARCH) += crc64-x86.o
crc64-x86-y := crc64-glue.o crc64-pclmul.o
crc64-x86-y := crc64.o crc64-pclmul.o
obj-$(CONFIG_CRC_T10DIF_ARCH) += crc-t10dif-x86.o
crc-t10dif-x86-y := crc-t10dif-glue.o crc16-msb-pclmul.o
crc-t10dif-x86-y := crc-t10dif.o crc16-msb-pclmul.o
obj-y += msr.o msr-reg.o msr-reg-export.o hweight.o
obj-y += iomem.o

4
arch/x86/lib/crc-t10dif-glue.c → arch/x86/lib/crc-t10dif.c
View File

@ -9,7 +9,7 @@
#include <linux/module.h>
#include "crc-pclmul-template.h"
static DEFINE_STATIC_KEY_FALSE(have_pclmulqdq);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pclmulqdq);
DECLARE_CRC_PCLMUL_FUNCS(crc16_msb, u16);
@ -29,7 +29,7 @@ static int __init crc_t10dif_x86_init(void)
}
return 0;
}
arch_initcall(crc_t10dif_x86_init);
subsys_initcall(crc_t10dif_x86_init);
static void __exit crc_t10dif_x86_exit(void)
{

6
arch/x86/lib/crc32-glue.c → arch/x86/lib/crc32.c
View File

@ -11,8 +11,8 @@
#include <linux/module.h>
#include "crc-pclmul-template.h"
static DEFINE_STATIC_KEY_FALSE(have_crc32);
static DEFINE_STATIC_KEY_FALSE(have_pclmulqdq);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_crc32);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pclmulqdq);
DECLARE_CRC_PCLMUL_FUNCS(crc32_lsb, u32);
@ -88,7 +88,7 @@ static int __init crc32_x86_init(void)
}
return 0;
}
arch_initcall(crc32_x86_init);
subsys_initcall(crc32_x86_init);
static void __exit crc32_x86_exit(void)
{

4
arch/x86/lib/crc64-glue.c → arch/x86/lib/crc64.c
View File

@ -9,7 +9,7 @@
#include <linux/module.h>
#include "crc-pclmul-template.h"
static DEFINE_STATIC_KEY_FALSE(have_pclmulqdq);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pclmulqdq);
DECLARE_CRC_PCLMUL_FUNCS(crc64_msb, u64);
DECLARE_CRC_PCLMUL_FUNCS(crc64_lsb, u64);
@ -39,7 +39,7 @@ static int __init crc64_x86_init(void)
}
return 0;
}
arch_initcall(crc64_x86_init);
subsys_initcall(crc64_x86_init);
static void __exit crc64_x86_exit(void)
{

10
crypto/Makefile
View File

@ -152,10 +152,12 @@ obj-$(CONFIG_CRYPTO_CHACHA20) += chacha_generic.o
obj-$(CONFIG_CRYPTO_POLY1305) += poly1305_generic.o
obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o
obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
obj-$(CONFIG_CRYPTO_CRC32C) += crc32c_generic.o
obj-$(CONFIG_CRYPTO_CRC32) += crc32_generic.o
CFLAGS_crc32c_generic.o += -DARCH=$(ARCH)
CFLAGS_crc32_generic.o += -DARCH=$(ARCH)
obj-$(CONFIG_CRYPTO_CRC32C) += crc32c-cryptoapi.o
crc32c-cryptoapi-y := crc32c.o
CFLAGS_crc32c.o += -DARCH=$(ARCH)
obj-$(CONFIG_CRYPTO_CRC32) += crc32-cryptoapi.o
crc32-cryptoapi-y := crc32.o
CFLAGS_crc32.o += -DARCH=$(ARCH)
obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o authencesn.o
obj-$(CONFIG_CRYPTO_KRB5ENC) += krb5enc.o
obj-$(CONFIG_CRYPTO_LZO) += lzo.o lzo-rle.o

0
crypto/crc32_generic.c → crypto/crc32.c
View File

0
crypto/crc32c_generic.c → crypto/crc32c.c
View File

12
drivers/w1/slaves/w1_ds2406.c
View File

@ -29,8 +29,6 @@ static ssize_t w1_f12_read_state(
{
u8 w1_buf[6] = {W1_F12_FUNC_READ_STATUS, 7, 0, 0, 0, 0};
struct w1_slave *sl = kobj_to_w1_slave(kobj);
u16 crc = 0;
int i;
ssize_t rtnval = 1;
if (off != 0)
@ -47,9 +45,7 @@ static ssize_t w1_f12_read_state(
w1_write_block(sl->master, w1_buf, 3);
w1_read_block(sl->master, w1_buf+3, 3);
for (i = 0; i < 6; i++)
crc = crc16_byte(crc, w1_buf[i]);
if (crc == 0xb001) /* good read? */
if (crc16(0, w1_buf, sizeof(w1_buf)) == 0xb001) /* good read? */
*buf = ((w1_buf[3]>>5)&3)|0x30;
else
rtnval = -EIO;
@ -66,8 +62,6 @@ static ssize_t w1_f12_write_output(
{
struct w1_slave *sl = kobj_to_w1_slave(kobj);
u8 w1_buf[6] = {W1_F12_FUNC_WRITE_STATUS, 7, 0, 0, 0, 0};
u16 crc = 0;
int i;
ssize_t rtnval = 1;
if (count != 1 || off != 0)
@ -83,9 +77,7 @@ static ssize_t w1_f12_write_output(
w1_buf[3] = (((*buf)&3)<<5)|0x1F;
w1_write_block(sl->master, w1_buf, 4);
w1_read_block(sl->master, w1_buf+4, 2);
for (i = 0; i < 6; i++)
crc = crc16_byte(crc, w1_buf[i]);
if (crc == 0xb001) /* good read? */
if (crc16(0, w1_buf, sizeof(w1_buf)) == 0xb001) /* good read? */
w1_write_8(sl->master, 0xFF);
else
rtnval = -EIO;

9
include/linux/crc16.h
View File

@ -15,14 +15,7 @@
#include <linux/types.h>
extern u16 const crc16_table[256];
extern u16 crc16(u16 crc, const u8 *buffer, size_t len);
static inline u16 crc16_byte(u16 crc, const u8 data)
{
return (crc >> 8) ^ crc16_table[(crc ^ data) & 0xff];
}
u16 crc16(u16 crc, const u8 *p, size_t len);
#endif /* __CRC16_H */

5
include/linux/crc32.h
View File

@ -1,7 +1,4 @@
/*
* crc32.h
* See linux/lib/crc32.c for license and changes
*/
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _LINUX_CRC32_H
#define _LINUX_CRC32_H

9
lib/crc16.c
View File

@ -8,7 +8,7 @@
#include <linux/crc16.h>
/** CRC table for the CRC-16. The poly is 0x8005 (x^16 + x^15 + x^2 + 1) */
u16 const crc16_table[256] = {
static const u16 crc16_table[256] = {
0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
@ -42,20 +42,19 @@ u16 const crc16_table[256] = {
0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
};
EXPORT_SYMBOL(crc16_table);
/**
* crc16 - compute the CRC-16 for the data buffer
* @crc: previous CRC value
* @buffer: data pointer
* @p: data pointer
* @len: number of bytes in the buffer
*
* Returns the updated CRC value.
*/
u16 crc16(u16 crc, u8 const *buffer, size_t len)
u16 crc16(u16 crc, const u8 *p, size_t len)
{
while (len--)
crc = crc16_byte(crc, *buffer++);
crc = (crc >> 8) ^ crc16_table[(crc & 0xff) ^ *p++];
return crc;
}
EXPORT_SYMBOL(crc16);

4
lib/crc32.c
View File

@ -1,3 +1,4 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Aug 8, 2011 Bob Pearson with help from Joakim Tjernlund and George Spelvin
* cleaned up code to current version of sparse and added the slicing-by-8
@ -19,9 +20,6 @@
* drivers/net/smc9194.c uses seed ~0, doesn't xor with ~0.
* fs/jffs2 uses seed 0, doesn't xor with ~0.
* fs/partitions/efi.c uses seed ~0, xor's with ~0.
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
/* see: Documentation/staging/crc32.rst for a description of algorithms */