diff options
| author | Len Brown <len.brown@intel.com> | 2011-01-12 18:06:06 -0500 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2011-01-12 18:06:06 -0500 |
| commit | 56dbed129df3fdd4caf9018b6e7599ee258a5420 (patch) | |
| tree | b902491aef3a99efe0d9d49edd0f6e414dba654f /include/linux/bitops.h | |
| parent | 2a2d31c8dc6f1ebcf5eab1d93a0cb0fb4ed57c7c (diff) | |
| parent | f878133bf022717b880d0e0995b8f91436fd605c (diff) | |
Merge branch 'linus' into idle-test
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) |