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| author | Akinobu Mita <mita@miraclelinux.com> | 2006-03-26 01:39:10 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-26 08:57:10 -0800 |
| commit | 2dfc383ad587bbead84739a9ff9273df3eda983d (patch) | |
| tree | 737b3d8e40b7e94de6299b72eed2ebf8e5fb68a4 /include/asm-generic | |
| parent | 136abb32d6b4acf196425fb3968ebb368d84280e (diff) | |
| download | lwn-2dfc383ad587bbead84739a9ff9273df3eda983d.tar.gz lwn-2dfc383ad587bbead84739a9ff9273df3eda983d.zip | |
[PATCH] bitops: generic fls64()
This patch introduces the C-language equivalent of the function: int
fls64(__u64 x);
In include/asm-generic/bitops/fls64.h
This code largely copied from: include/linux/bitops.h
Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/bitops/fls64.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/asm-generic/bitops/fls64.h b/include/asm-generic/bitops/fls64.h new file mode 100644 index 000000000000..716c51e0dd4c --- /dev/null +++ b/include/asm-generic/bitops/fls64.h @@ -0,0 +1,12 @@ +#ifndef _ASM_GENERIC_BITOPS_FLS64_H_ +#define _ASM_GENERIC_BITOPS_FLS64_H_ + +static inline int fls64(__u64 x) +{ + __u32 h = x >> 32; + if (h) + return fls(h) + 32; + return fls(x); +} + +#endif /* _ASM_GENERIC_BITOPS_FLS64_H_ */ |