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Re: [Xen-merge] fs/gs handling
| To: | Kurt Garloff <garloff@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-merge] fs/gs handling |
| From: | Andi Kleen <ak@xxxxxxx> |
| Date: | Fri, 12 Aug 2005 11:26:27 +0200 |
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| Delivery-date: | Fri, 12 Aug 2005 09:24:32 +0000 |
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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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