diff options
| author | Paul Mundt <lethal@linux-sh.org> | 2011-01-07 10:29:26 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2011-01-07 10:29:26 +0900 |
| commit | 5e93c6b4ecd78b1bab49bad1dc2f6ed7ec0115ee (patch) | |
| tree | 4f4e321a1ca0baf64d8af528080c71f93495a7d7 /include/linux/bitops.h | |
| parent | 98d27b8abf413a310df6676f7d2128ada1cccc08 (diff) | |
| parent | 3c0cb7c31c206aaedb967e44b98442bbeb17a6c4 (diff) | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into rmobile-latest
Conflicts:
arch/arm/mach-shmobile/Kconfig
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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 827cc95711e..2184c6b97ae 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) |