Re: x86-64 bad pmds in II

From: Dave Jones
Date: Fri Apr 29 2005 - 12:34:20 EST

On Fri, Apr 29, 2005 at 07:12:59AM -0400, Christopher Warner wrote:
> > It does. Well, I needed to restudy exec_mmap and switch_mm in detail,
> > and having done so, I agree that the only way you can get through
> > exec_mmap's activate_mm without fully flushing the cpu's TLB, is if
> > the active_mm matches the newly allocated mm (itself impossible since
> > there's a reference on the active_mm), and the cpu bit is still set
> > in cpu_vm_mask - precisely not the case if we went through leave_mm.
> > Yet I was claiming your leave_mm fix could flush TLB for exec_mmap
> > where it wasn't already done.
> >
> > Sorry for letting the neatness of my pmd/stack story blind me
> > to its impossibility, and for wasting your time.
> >
> > Hugh
> > -
> Any updated information one should know about this before testing?
> I'm getting bad pmds in; Tyan S2882/dual AMD 246 opterons.

Datapoint: exactly the same model as my workstation which showed
this problem recently.

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