lib/crc: Move polynomial definition to separate header

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>

diff --git a/include/linux/crc32poly.h b/include/linux/crc32poly.h
new file mode 100644 (file)
index 0000000..7ad5aa9
--- /dev/null
+++ b/include/linux/crc32poly.h
@@ -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 */

diff --git a/lib/crc32.c b/lib/crc32.c
index 2ef20fe84b69056b345467f1dd17b3d9c705c1b0..341c54cb4edfa83269f0424464dad5da3490431e 100644 (file)
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -27,6 +27,7 @@
 /* see: Documentation/crc32.txt for a description of algorithms */
 
 #include <linux/crc32.h>
+#include <linux/crc32poly.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/sched.h>

diff --git a/lib/crc32defs.h b/lib/crc32defs.h
index cb275a28a7500232a04e8f1a6b141287603d6208..0c8fb5923e7ea7a7893d6eb773dd4b1cf2e8bdd6 100644 (file)
--- a/lib/crc32defs.h
+++ b/lib/crc32defs.h
@@ -1,18 +1,4 @@
 /* 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 */
 #ifdef CONFIG_CRC32_SLICEBY8

diff --git a/lib/gen_crc32table.c b/lib/gen_crc32table.c
index 8f26660ea10a4cd47255a46c2cd5ec9113d5d420..34c3bc826f451a24fe2e3ebcd5a540d5ac960e54 100644 (file)
--- a/lib/gen_crc32table.c
+++ b/lib/gen_crc32table.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <stdio.h>
+#include "../include/linux/crc32poly.h"
 #include "../include/generated/autoconf.h"
 #include "crc32defs.h"
 #include <inttypes.h>