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| author | George Spelvin <linux@horizon.com> | 2014-05-10 10:32:57 -0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2014-05-16 14:26:52 -0400 |
| commit | 1836eea209546b870dd83f3f4ef234d6598a560d (patch) | |
| tree | 6d47ab85b4eb40d414ba74f2972b80096fd764b2 /include/linux | |
| parent | d91a48cbae4cc12f6e8a65372a73ecf46f8f1b7f (diff) | |
| download | linux-1836eea209546b870dd83f3f4ef234d6598a560d.tar.gz linux-1836eea209546b870dd83f3f4ef234d6598a560d.tar.bz2 linux-1836eea209546b870dd83f3f4ef234d6598a560d.zip | |
lib/crc7: Shift crc7() output left 1 bit
This eliminates a 1-bit left shift in every single caller,
and makes the inner loop of the CRC computation more efficient.
Renamed crc7 to crc7_be (big-endian) since the interface changed.
Also purged #include <linux/crc7.h> from files that don't use it at all.
Signed-off-by: George Spelvin <linux@horizon.com>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/crc7.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/linux/crc7.h b/include/linux/crc7.h index 1786e772d5c6..d590765106f3 100644 --- a/include/linux/crc7.h +++ b/include/linux/crc7.h @@ -2,13 +2,13 @@ #define _LINUX_CRC7_H #include <linux/types.h> -extern const u8 crc7_syndrome_table[256]; +extern const u8 crc7_be_syndrome_table[256]; -static inline u8 crc7_byte(u8 crc, u8 data) +static inline u8 crc7_be_byte(u8 crc, u8 data) { - return crc7_syndrome_table[(crc << 1) ^ data]; + return crc7_be_syndrome_table[crc ^ data]; } -extern u8 crc7(u8 crc, const u8 *buffer, size_t len); +extern u8 crc7_be(u8 crc, const u8 *buffer, size_t len); #endif |