From: Rob Herring rob.herring@calxeda.com
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 --- Performance here is not critical, so I'm changing this to use the C version.
v2 changes: - Change __inline__ to inline. - Use generic_fls function instead of clz asm so it works with ARMv4.
arch/arm/include/asm/bitops.h | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-)
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 @@ static inline int test_bit(int nr, const void * addr) 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..