On 11/28/2012 12:41 PM, Borislav Petkov wrote:
>
> While at it, you could correct this comment to adhere to kernel coding
> style:
>
> /*
> * cpuid is a barrier...
> * ...
> */
>
>> + asm volatile("cpuid" : "=a" (tmp) : "0" (1)
>> + : "ebx", "ecx", "edx", "memory");
>
> ... and then write this in its shorter form:
>
> tmp = cpuid_eax(1);
>
> to have it a bit easier on the eyes.
>
Thinking about it some more, there is another reason to not do this,
which is that we don't want this particular CPUID to be paravirtualized;
we're after the synchronizing side effect, not the CPUID return value
itself.
So let's leave it as a primitive; it gets too confusing otherwise.
-hpa
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