On 1/17/2012 2:19 PM, Linus Walleij wrote:

Are you looking for ffs() from <linus/bitops.h>?

find-first-set (the include boils down to include/asm-generic/bitops/ffs.h
if you want to check the implementation).

Thanks, but it might not solve the issue. :(
Actually this will retain the first Least Significant Bit (which is 1)
and will mark all other zero. So it will give output 0b10 for 0b110

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+      * Fix sconfig's burst size according to dw_dmac. We need to convert
+      * them as: 1 -> 0, 2 -> 1, 4 -> 2, 8 -> 3, 16 -> 4.

I need above conversion. i.e. finding bit no. of first bit set.

-- 
viresh