diff options
| author | Simon Horman <horms@verge.net.au> | 2011-01-13 04:29:21 +0300 |
|---|---|---|
| committer | Simon Horman <horms@verge.net.au> | 2011-01-13 04:29:21 +0300 |
| commit | fee1cc0895fd7bde875a86bbc3a1e82089e540b8 (patch) | |
| tree | df0a07a650229fd7aa775ca6c20a8d2939c96e72 /include/linux/bitops.h | |
| parent | ae90bdeaeac6b964b7a1e853a90a19f358a9ac20 (diff) | |
| parent | 0c21e3aaf6ae85bee804a325aa29c325209180fd (diff) | |
| download | linux-fee1cc0895fd7bde875a86bbc3a1e82089e540b8.tar.xz | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 into HEAD
Diffstat (limited to 'include/linux/bitops.h')
| -rw-r--r-- | include/linux/bitops.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/bitops.h b/include/linux/bitops.h index 827cc95711ef..2184c6b97aeb 100644 --- a/include/linux/bitops.h +++ b/include/linux/bitops.h @@ -109,6 +109,17 @@ static inline __u8 ror8(__u8 word, unsigned int shift) return (word >> shift) | (word << (8 - shift)); } +/** + * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit + * @value: value to sign extend + * @index: 0 based bit index (0<=index<32) to sign bit + */ +static inline __s32 sign_extend32(__u32 value, int index) +{ + __u8 shift = 31 - index; + return (__s32)(value << shift) >> shift; +} + static inline unsigned fls_long(unsigned long l) { if (sizeof(l) == 4) |