On 10/16/2012 08:53 AM, Theodore Ts'o wrote:
>
> ... and it looks like include/linux/log2.h already has a definition
> for ilog2() which should definitely work for all versions of gcc, so
> we could do this instead:
>
> #define shiftbits(w) (ilog2((w)) + 5)
>
> /* x^128 + x^103 + x^76 + x^51 +x^25 + x + 1 -- 105 */
> { shiftbits(128), 103, 76, 51, 25, 1 },
> /* x^32 + x^26 + x^20 + x^14 + x^7 + x + 1 -- 15 */
> { shiftbits(32), 26, 20, 14, 7, 1 },
>
OK, works for me. I'll rev the patch later this week.
-hpa
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