Re: 2.6.18-rc6-mm1: GPF loop on early boot

[Jeremy Fitzhardinge]

Ingo Molnar wrote:
> because userspace does not use it normally, while with %gs we'd switch 
> between glibc's descriptor [which must be shadowed by the CPU] and the 
> kernel's descriptor [which must be shadowed by the CPU too] - hence 
> causing a constant reloading of the shadow register.
>   

Well, that means the only operation which would be different would be 
the pop %fs at the end, since only it would end up loading a null 
selector.  All the other operations would presumably take just as long.

   J
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