diff --git a/arch/x86/include/asm/bitops.h b/arch/x86/include/asm/bitops.h
index c7a38f237a5cf0bcbbcf996ff8ffc01698a62220..5a7e4cba2b2fb48786206331e64222fda5f9f865 100644
--- 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