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x86: Add ilog2 to bitops

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ilog2 is required by AHCI driver

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Graeme Russ 2012-11-27 15:38:38 +00:00 committed by Simon Glass
parent c73c6de60c
commit 8abebe3ead
1 changed files with 5 additions and 0 deletions
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5
arch/x86/include/asm/bitops.h
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@ -351,6 +351,11 @@ static __inline__ int ffs(int x)
} }
#define PLATFORM_FFS #define PLATFORM_FFS
static inline int __ilog2(unsigned int x)
{
return generic_fls(x) - 1;
}
/** /**
* hweightN - returns the hamming weight of a N-bit word * hweightN - returns the hamming weight of a N-bit word
* @x: the word to weigh * @x: the word to weigh