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authorDarrick J. Wong <djwong@us.ibm.com>2012-03-23 15:02:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-23 16:58:38 -0700
commit5cde7656d0dd222170eb0250bd1f70c9018fd438 (patch)
tree6ebd5b76968f84d5fd8545cfe3400162d76d222c /lib/crc32defs.h
parent577eba9e22e872574c466648b46eeb3e0d04372e (diff)
crc32: select an algorithm via Kconfig
Allow the kernel builder to choose a crc32* algorithm for the kernel. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Cc: Bob Pearson <rpearson@systemfabricworks.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/crc32defs.h')
-rw-r--r--lib/crc32defs.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/crc32defs.h b/lib/crc32defs.h
index 6fd191732fe..64cba2c3c70 100644
--- a/lib/crc32defs.h
+++ b/lib/crc32defs.h
@@ -13,6 +13,24 @@
*/
#define CRC32C_POLY_LE 0x82F63B78
+/* Try to choose an implementation variant via Kconfig */
+#ifdef CONFIG_CRC32_SLICEBY8
+# define CRC_LE_BITS 64
+# define CRC_BE_BITS 64
+#endif
+#ifdef CONFIG_CRC32_SLICEBY4
+# define CRC_LE_BITS 32
+# define CRC_BE_BITS 32
+#endif
+#ifdef CONFIG_CRC32_SARWATE
+# define CRC_LE_BITS 8
+# define CRC_BE_BITS 8
+#endif
+#ifdef CONFIG_CRC32_BIT
+# define CRC_LE_BITS 1
+# define CRC_BE_BITS 1
+#endif
+
/*
* How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64.
* For less performance-sensitive, use 4 or 8 to save table size.