Re: x86-64 bad pmds in 2.6.11.6 II

[Dave Jones]

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 2.6.11.5; Tyan S2882/dual AMD 246 opterons.

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

		Dave
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