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| author | Darrick J. Wong <djwong@us.ibm.com> | 2012-03-23 15:02:26 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-23 16:58:38 -0700 |
| commit | 5cde7656d0dd222170eb0250bd1f70c9018fd438 (patch) | |
| tree | 6ebd5b76968f84d5fd8545cfe3400162d76d222c /lib/crc32defs.h | |
| parent | 577eba9e22e872574c466648b46eeb3e0d04372e (diff) | |
| download | lwn-5cde7656d0dd222170eb0250bd1f70c9018fd438.tar.gz lwn-5cde7656d0dd222170eb0250bd1f70c9018fd438.zip | |
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.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/crc32defs.h b/lib/crc32defs.h index 6fd191732fec..64cba2c3c700 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. |