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author | David S. Miller <davem@davemloft.net> | 2010-11-16 12:17:12 -0500 |
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committer | David S. Miller <davem@davemloft.net> | 2010-11-16 12:17:12 -0500 |
commit | b5e4156743c5d42b736936be7a9ee8d72e0e4ac9 (patch) | |
tree | f0edde33e7b2502ab35a4f63be1a8be31f5f4b6a /include/linux/bitops.h | |
parent | 6b35308850e1679741e8b646cfb7bb3ab5369888 (diff) | |
parent | b1d771ee33c6e4006676002b9d74abf45b71d3d6 (diff) |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6
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) | |||
109 | return (word >> shift) | (word << (8 - shift)); | 109 | return (word >> shift) | (word << (8 - shift)); |
110 | } | 110 | } |
111 | 111 | ||
112 | /** | ||
113 | * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit | ||
114 | * @value: value to sign extend | ||
115 | * @index: 0 based bit index (0<=index<32) to sign bit | ||
116 | */ | ||
117 | static inline __s32 sign_extend32(__u32 value, int index) | ||
118 | { | ||
119 | __u8 shift = 31 - index; | ||
120 | return (__s32)(value << shift) >> shift; | ||
121 | } | ||
122 | |||
112 | static inline unsigned fls_long(unsigned long l) | 123 | static inline unsigned fls_long(unsigned long l) |
113 | { | 124 | { |
114 | if (sizeof(l) == 4) | 125 | if (sizeof(l) == 4) |