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authorHarvey Harrison <harvey.harrison@gmail.com>2008-03-28 17:16:01 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-03-28 17:45:22 -0400
commit3afe3925987adc3fc052abe404e44520c2072fc8 (patch)
treecf77c295869b10591865898857d5adaae000415c /include
parent589499c04b9929ce3de9a9cc591f8a24cf1ebc91 (diff)
kernel: add bit rotation helpers for 16 and 8 bit
Will replace open-coded variants elsewhere. Done in the same style as the 32-bit versions. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: John W. Linville <linville@tuxdriver.com> Cc: Joe Perches <joe@perches.com> Cc: Jiri Benc <jbenc@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/bitops.h40
1 files changed, 40 insertions, 0 deletions
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 69c1edb9fe54..40d54731de7e 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -65,6 +65,46 @@ static inline __u32 ror32(__u32 word, unsigned int shift)
65 return (word >> shift) | (word << (32 - shift)); 65 return (word >> shift) | (word << (32 - shift));
66} 66}
67 67
68/**
69 * rol16 - rotate a 16-bit value left
70 * @word: value to rotate
71 * @shift: bits to roll
72 */
73static inline __u16 rol16(__u16 word, unsigned int shift)
74{
75 return (word << shift) | (word >> (16 - shift));
76}
77
78/**
79 * ror16 - rotate a 16-bit value right
80 * @word: value to rotate
81 * @shift: bits to roll
82 */
83static inline __u16 ror16(__u16 word, unsigned int shift)
84{
85 return (word >> shift) | (word << (16 - shift));
86}
87
88/**
89 * rol8 - rotate an 8-bit value left
90 * @word: value to rotate
91 * @shift: bits to roll
92 */
93static inline __u8 rol8(__u8 word, unsigned int shift)
94{
95 return (word << shift) | (word >> (8 - shift));
96}
97
98/**
99 * ror8 - rotate an 8-bit value right
100 * @word: value to rotate
101 * @shift: bits to roll
102 */
103static inline __u8 ror8(__u8 word, unsigned int shift)
104{
105 return (word >> shift) | (word << (8 - shift));
106}
107
68static inline unsigned fls_long(unsigned long l) 108static inline unsigned fls_long(unsigned long l)
69{ 109{
70 if (sizeof(l) == 4) 110 if (sizeof(l) == 4)