>
> You can then make it a compile-time failure with something like
>
> extern unsigned int this_doesnt_exist_and_wont_link;
>
> is_contiguous_mask(x) ? (x) : this_doesnt_exist_and_wont_link;
>
> which returns "x" if it's ok, and an unlinkable expression if it isn't.
Or you can use the already defined macros in kernel.h for this:
/* Force a compilation error if condition is true */
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
/* Force a compilation error if condition is true, but also produce a
result (of value 0 and type size_t), so the expression can be used
e.g. in a structure initializer (or where-ever else comma expressions
aren't permitted). */
#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
Sam
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