Messages in this thread | | | Date | Wed, 18 Jun 2014 07:59:14 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH v6 03/10] x86, mpx: add macro cpu_has_mpx |
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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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