Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init

From: Borislav Petkov
Date: Mon Jan 18 2016 - 13:39:52 EST

On Mon, Jan 18, 2016 at 10:29:24AM -0800, Andy Lutomirski wrote:
> I think that, if we can make static_cpu_has be unconditionally safe as
> a result

Problem with this is the additional .altinstructions entry for
X86_FEATURE_ALWAYS. And sometimes you don't really need to use the _safe
variant when you know you're safe.

> and get rid of warn_pre_alternatives,

That's off by default, behind CONFIG_X86_DEBUG_STATIC_CPU_HAS.


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