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linux: crc32c: Use ext4l CRC32C implementation

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Update include/linux/crc32c.h to map crc32c() and crc32c_le() macros
to ext4l_crc32c(), which uses the correct Castagnoli polynomial
(0x82F63B78) required for ext4 checksums.

This avoids conflicts with other filesystems like btrfs that have
their own crc32c() implementation.

Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
This commit is contained in:
Simon Glass
2025-12-21 20:04:25 -07:00
parent d328bf1ff3
commit 56b6e306fb
1 changed files with 10 additions and 9 deletions
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19
include/linux/crc32c.h
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@@ -1,21 +1,22 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* CRC32C definitions
* CRC32C definitions for ext4l
*
* Minimal version for U-Boot ext4l - based on Linux 6.18
* CRC32C (Castagnoli) uses polynomial 0x1EDC6F41 (bit-reflected: 0x82F63B78)
* This is different from standard CRC32 (IEEE 802.3) which uses 0x04C11DB7.
*
* ext4l provides its own implementation to avoid conflicts with other
* filesystems (e.g., btrfs) that have their own crc32c().
*/
#ifndef _LINUX_CRC32C_H
#define _LINUX_CRC32C_H
#include <asm/byteorder.h>
#include <linux/types.h>
#include <u-boot/crc.h>
/* Use U-Boot's CRC32 implementation */
static inline u32 crc32c(u32 crc, const void *address, unsigned int length)
{
return crc32(crc, address, length);
}
u32 ext4l_crc32c(u32 crc, const void *address, unsigned int length);
#define crc32c_le(crc, p, len) crc32c(crc, p, len)
#define crc32c(crc, p, len) ext4l_crc32c(crc, p, len)
#define crc32c_le(crc, p, len) ext4l_crc32c(crc, p, len)
#endif /* _LINUX_CRC32C_H */