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SubjectRe: x86: A fast way to check capabilities of the current cpu
On Wed, 15 Dec 2010 14:07:39 -0600 (CST)
Christoph Lameter <cl@linux.com> wrote:

> +#define cpu_has(c, bit) \
> + (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
> test_cpu_cap(c, bit))
>
> +#define this_cpu_has(bit) \
> + (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
> + this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
> +

Isn't

a ? 1 : b

a complex way of writing

a || b
?


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