arm: add __ilog2 function
Add __ilog2 function for ARM. Needed for ahci.c
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Albert ARIBAUD <albert.aribaud@free.fr>
diff --git a/arch/arm/include/asm/bitops.h b/arch/arm/include/asm/bitops.h
index 270f163..879e20e 100644
--- a/arch/arm/include/asm/bitops.h
+++ b/arch/arm/include/asm/bitops.h
@@ -106,6 +106,11 @@
return ((unsigned char *) addr)[nr >> 3] & (1U << (nr & 7));
}
+static inline int __ilog2(unsigned int x)
+{
+ return generic_fls(x) - 1;
+}
+
/*
* ffz = Find First Zero in word. Undefined if no zero exists,
* so code should check against ~0UL first..