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DateSun, 22 Aug 2010 21:27:05 +0200
FromAndi Kleen <>
SubjectRe: [PATCH for -tip 1/2] kernel.h: add MAYBE_BUILD_BUG_ON_NOT_POWER_OF_2
> +/* Force a compilation error if condition is constant and not a power of 2 */
> +#define MAYBE_BUILD_BUG_ON_NOT_POWER_OF_2(n) \
> + MAYBE_BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))

Looks super-ugly. IMHO just writing MAYBE_BUILD_BUG_ON(!n || n & (n - 1)) directly
would be clear enough. If you really think that's unclear define a generic
is_power_of_two() macro.
-Andi


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