Re: x86: A fast way to check capabilities of the current cpu

[Andrew Morton]

On Wed, 15 Dec 2010 14:07:39 -0600 (CST)
Christoph Lameter <cl@xxxxxxxxx> 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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