mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1a822ea52a
Fix build warnings with W=1 that started appearing after
commit a934a57a42 ("scripts/misc-check: check missing #include
<linux/export.h> when W=1"). While at it, sort the include lists
alphabetically.
Link: https://lore.kernel.org/r/20250612183852.114878-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Aug 8, 2011 Bob Pearson with help from Joakim Tjernlund and George Spelvin
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* cleaned up code to current version of sparse and added the slicing-by-8
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* algorithm to the closely similar existing slicing-by-4 algorithm.
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*
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* Oct 15, 2000 Matt Domsch <Matt_Domsch@dell.com>
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* Nicer crc32 functions/docs submitted by linux@horizon.com. Thanks!
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* Code was from the public domain, copyright abandoned. Code was
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* subsequently included in the kernel, thus was re-licensed under the
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* GNU GPL v2.
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*
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* Oct 12, 2000 Matt Domsch <Matt_Domsch@dell.com>
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* Same crc32 function was used in 5 other places in the kernel.
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* I made one version, and deleted the others.
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* There are various incantations of crc32(). Some use a seed of 0 or ~0.
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* Some xor at the end with ~0. The generic crc32() function takes
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* seed as an argument, and doesn't xor at the end. Then individual
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* users can do whatever they need.
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* drivers/net/smc9194.c uses seed ~0, doesn't xor with ~0.
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* fs/jffs2 uses seed 0, doesn't xor with ~0.
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* fs/partitions/efi.c uses seed ~0, xor's with ~0.
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*/
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/* see: Documentation/staging/crc32.rst for a description of algorithms */
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#include <linux/crc32.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include "crc32table.h"
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static inline u32 __maybe_unused
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crc32_le_base(u32 crc, const u8 *p, size_t len)
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{
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while (len--)
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crc = (crc >> 8) ^ crc32table_le[(crc & 255) ^ *p++];
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return crc;
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}
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static inline u32 __maybe_unused
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crc32_be_base(u32 crc, const u8 *p, size_t len)
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{
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while (len--)
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crc = (crc << 8) ^ crc32table_be[(crc >> 24) ^ *p++];
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return crc;
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}
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static inline u32 __maybe_unused
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crc32c_base(u32 crc, const u8 *p, size_t len)
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{
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while (len--)
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crc = (crc >> 8) ^ crc32ctable_le[(crc & 255) ^ *p++];
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return crc;
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}
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#ifdef CONFIG_CRC32_ARCH
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#include "crc32.h" /* $(SRCARCH)/crc32.h */
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u32 crc32_optimizations(void)
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{
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return crc32_optimizations_arch();
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}
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EXPORT_SYMBOL(crc32_optimizations);
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#else
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#define crc32_le_arch crc32_le_base
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#define crc32_be_arch crc32_be_base
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#define crc32c_arch crc32c_base
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#endif
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u32 crc32_le(u32 crc, const void *p, size_t len)
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{
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return crc32_le_arch(crc, p, len);
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}
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EXPORT_SYMBOL(crc32_le);
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u32 crc32_be(u32 crc, const void *p, size_t len)
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{
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return crc32_be_arch(crc, p, len);
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}
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EXPORT_SYMBOL(crc32_be);
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u32 crc32c(u32 crc, const void *p, size_t len)
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{
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return crc32c_arch(crc, p, len);
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}
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EXPORT_SYMBOL(crc32c);
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#ifdef crc32_mod_init_arch
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static int __init crc32_mod_init(void)
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{
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crc32_mod_init_arch();
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return 0;
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}
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subsys_initcall(crc32_mod_init);
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static void __exit crc32_mod_exit(void)
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{
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}
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module_exit(crc32_mod_exit);
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#endif
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MODULE_DESCRIPTION("CRC32 library functions");
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MODULE_LICENSE("GPL");
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