On 06/18/2014 07:35 AM, Dave Hansen wrote:
>
> It looks like static_cpu_has() is the right thing to use instead of
> boot_cpu_has(). But, this doesn't just obfuscate things.
>
> We actually _want_ the compiler to cull code out when the config option
> is off. Things like do_bounds() will see code savings with _some_ kind
> of #ifdef rather than using static_cpu_has().
>
> So, we can either use the well worn, consistent with other features in
> x86, cpu_has_$foo approach. Or, we can roll our own macros.
>
We could do something like:
#define MPX_ENABLED (IS_ENABLED(CONFIG_X86_MPX) &&
static_cpu_has(X86_FEATURE_MPX))
-hpa
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