x86: Add ilog2 to bitops

ilog2 is required by AHCI driver Signed-off-by: Graeme Russ <graeme.russ@gmail.com> Signed-off-by: Simon Glass <sjg@chromium.org>
13 years ago · 8abebe3ead
parent c73c6de60c
commit 8abebe3ead
1 changed files with 5 additions and 0 deletions
--- a/arch/x86/include/asm/bitops.h
+++ b/arch/x86/include/asm/bitops.h
@ -351,6 +351,11 @@ static __inline__ int ffs(int x)
 }
 #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
 * @x: the word to weigh