From: Fabio Estevam fabio.estevam@freescale.com
Use the generic bitops and also add custom __ffs() implementation as per the kernel.
Also align the ffs() implementation with the kernel.
Signed-off-by: Fabio Estevam fabio.estevam@freescale.com --- arch/x86/include/asm/bitops.h | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/bitops.h b/arch/x86/include/asm/bitops.h index 5a7e4cb..f97dc66 100644 --- a/arch/x86/include/asm/bitops.h +++ b/arch/x86/include/asm/bitops.h @@ -14,6 +14,10 @@ * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1). */
+#include <asm-generic/bitops/fls.h> +#include <asm-generic/bitops/__fls.h> +#include <asm-generic/bitops/fls64.h> + #ifdef CONFIG_SMP #define LOCK_PREFIX "lock ; " #else @@ -332,6 +336,20 @@ static __inline__ unsigned long ffz(unsigned long word) #ifdef __KERNEL__
/** + * __ffs - find first set bit in word + * @word: The word to search + * + * Undefined if no bit exists, so code should check against 0 first. + */ +static inline unsigned long __ffs(unsigned long word) +{ + __asm__("rep; bsf %1,%0" + : "=r" (word) + : "rm" (word)); + return word; +} + +/** * ffs - find first bit set * @x: the word to search * @@ -346,7 +364,8 @@ static __inline__ int ffs(int x) __asm__("bsfl %1,%0\n\t" "jnz 1f\n\t" "movl $-1,%0\n" - "1:" : "=r" (r) : "g" (x)); + "1:" : "=r" (r) : "rm" (x)); + return r+1; } #define PLATFORM_FFS