On 1/17/2012 2:45 PM, Viresh Kumar wrote:

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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.

Something like:

unsigned int v; // 32-bit word
unsigned int r = 0;

while (v >>= 1)
{
  r++;
}

Probably find_first_bit() suits it.

-- 
viresh