Re: [patch] x86, mm: avoid stale tlb entries by clearing prev mm_cpumaskafter switching mm

[H. Peter Anvin]

On 02/02/2011 08:12 PM, Linus Torvalds wrote:
> 
> So right now, we pretty much depend on "asm volatile" (a) not being
> re-ordered wrt other asm volatiles and (b) having that dependency on
> memory.
> 
> Iirc, the gcc people even agreed on this. Peter may remember details better..
> 

Yes, IIRC an "asm volatile" is assumed to be a universal consumer of
memory (it is only a universal producer if the "memory" clobber is
used), as well as being ordered with respect to other volatile operations.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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