Re: [Xen-merge] fs/gs handling

[Andi Kleen <ak@xxxxxxx>]

On Fri, Aug 12, 2005 at 05:11:49AM +0200, Kurt Garloff wrote:
> Hi Chris,
> 
> On Thu, Aug 11, 2005 at 07:41:45PM -0700, Chris Wright wrote:
> > Any reason that fs/gs are specifically handled with mov not movl in
> > these cases?
> > 
> >  #define deactivate_mm(tsk, mm) \
> > -   asm("movl %0,%%fs ; movl %0,%%gs": :"r" (0))
> > +   asm("mov %0,%%fs ; mov %0,%%gs": :"r" (0))
> 
> mov works for both x86 and x86-64 ...
> ... though I don't know whether that's relevant here.

It's not. Segment registers cannot be 64bit.

-Andi

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