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| author |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2011-03-18 23:38:50 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2011-03-18 23:38:50 -0700 |
| commit | 97eb3f24352ec6632c2127b35d8087d2a809a9b9 (patch) | |
| tree | 722948059bbd325bbca232269490124231df80d4 /include/linux/bitops.h | |
| parent | Input: evdev - fix evdev_write return value on partial writes (diff) | |
| parent | Merge branch 'tsc2005' into next (diff) | |
| download | wireguard-linux-97eb3f24352ec6632c2127b35d8087d2a809a9b9.tar.xz wireguard-linux-97eb3f24352ec6632c2127b35d8087d2a809a9b9.zip | |
Merge branch 'next' into for-linus
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) |