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| author | Akinobu Mita <mita@miraclelinux.com> | 2006-03-26 01:39:08 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-26 08:57:10 -0800 |
| commit | 176d8b0c2709e764d491e63a0c1b3a3e1459fcf8 (patch) | |
| tree | fd45cfce91c9fc75b4383fe0b62f77febf875c6c /include/asm-generic/bitops/ffz.h | |
| parent | c1226a005ec400e966f4993dfcc0e99fd7baa6a1 (diff) | |
| download | lwn-176d8b0c2709e764d491e63a0c1b3a3e1459fcf8.tar.gz lwn-176d8b0c2709e764d491e63a0c1b3a3e1459fcf8.zip | |
[PATCH] bitops: generic ffz()
This patch introduces the C-language equivalent of the function: unsigned long
ffz(unsigned long word);
In include/asm-generic/bitops/ffz.h
This code largely copied from: include/asm-parisc/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/bitops/ffz.h')
| -rw-r--r-- | include/asm-generic/bitops/ffz.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/asm-generic/bitops/ffz.h b/include/asm-generic/bitops/ffz.h new file mode 100644 index 000000000000..6744bd4cdf46 --- /dev/null +++ b/include/asm-generic/bitops/ffz.h @@ -0,0 +1,12 @@ +#ifndef _ASM_GENERIC_BITOPS_FFZ_H_ +#define _ASM_GENERIC_BITOPS_FFZ_H_ + +/* + * ffz - find first zero in word. + * @word: The word to search + * + * Undefined if no zero exists, so code should check against ~0UL first. + */ +#define ffz(x) __ffs(~(x)) + +#endif /* _ASM_GENERIC_BITOPS_FFZ_H_ */ |