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lib/crc: Move polynomial definition to separate header

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Allow other drivers and parts of kernel to use the same define for
CRC32 polynomial, instead of duplicating it in many places.  This code
does not bring any functional changes, except moving existing code.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Krzysztof Kozlowski 2018-07-17 18:05:36 +02:00 committed by Herbert Xu
parent d96542ac10
commit 1fb2e3f276
4 changed files with 22 additions and 14 deletions
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20
include/linux/crc32poly.h Normal file
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@ -0,0 +1,20 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_CRC32_POLY_H
#define _LINUX_CRC32_POLY_H
/*
* There are multiple 16-bit CRC polynomials in common use, but this is
* *the* standard CRC-32 polynomial, first popularized by Ethernet.
* x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x^1+x^0
*/
#define CRCPOLY_LE 0xedb88320
#define CRCPOLY_BE 0x04c11db7
/*
* This is the CRC32c polynomial, as outlined by Castagnoli.
* x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+x^11+x^10+x^9+
* x^8+x^6+x^0
*/
#define CRC32C_POLY_LE 0x82F63B78
#endif /* _LINUX_CRC32_POLY_H */

1
lib/crc32.c
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@ -27,6 +27,7 @@
/* see: Documentation/crc32.txt for a description of algorithms */ /* see: Documentation/crc32.txt for a description of algorithms */
#include <linux/crc32.h> #include <linux/crc32.h>
#include <linux/crc32poly.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/types.h> #include <linux/types.h>
#include <linux/sched.h> #include <linux/sched.h>

14
lib/crc32defs.h
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@ -1,18 +1,4 @@
/* SPDX-License-Identifier: GPL-2.0 */ /* SPDX-License-Identifier: GPL-2.0 */
/*
* There are multiple 16-bit CRC polynomials in common use, but this is
* *the* standard CRC-32 polynomial, first popularized by Ethernet.
* x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x^1+x^0
*/
#define CRCPOLY_LE 0xedb88320
#define CRCPOLY_BE 0x04c11db7
/*
* This is the CRC32c polynomial, as outlined by Castagnoli.
* x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+x^11+x^10+x^9+
* x^8+x^6+x^0
*/
#define CRC32C_POLY_LE 0x82F63B78
/* Try to choose an implementation variant via Kconfig */ /* Try to choose an implementation variant via Kconfig */
#ifdef CONFIG_CRC32_SLICEBY8 #ifdef CONFIG_CRC32_SLICEBY8

1
lib/gen_crc32table.c
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@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0 // SPDX-License-Identifier: GPL-2.0
#include <stdio.h> #include <stdio.h>
#include "../include/linux/crc32poly.h"
#include "../include/generated/autoconf.h" #include "../include/generated/autoconf.h"
#include "crc32defs.h" #include "crc32defs.h"
#include <inttypes.h> #include <inttypes.h>