Re: [PATCH 8/8] x86, cleanups: Simplify sync_core() in the case ofno CPUID

[H. Peter Anvin]

On 11/29/2012 01:13 AM, Borislav Petkov wrote:
> 
> RCX gets correctly cleaned to 0 and *then* we call CPUID.
> 
> And the asm output is the same except that RCX gets correctly cleaned up
> before calling CPUID.
> 
> So what am I missing?
> 

It doesn't matter in that context, as the surrounding MSR references
have barriers, but what I'm refering to is the "memory" barrier.

The value of ECX doesn't matter when EAX=1.

	-hpa


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