diff options
| author | Rob Herring <rob.herring@calxeda.com> | 2011-07-05 04:38:51 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2011-07-16 13:00:11 +0200 |
| commit | 0b9bc73711aed13246dd2cb91a3f658eeb25baf5 (patch) | |
| tree | b26c3da20acebabca94d35f91a587815ccbffc06 /arch/arm | |
| parent | a60d1e5b8e5007f53c198acc5ca636ae570ae180 (diff) | |
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>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | 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 270f163eee3..879e20e0246 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.. |