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    SubjectRe: [patch] x86, mm: avoid stale tlb entries by clearing prev mm_cpumask after switching mm
    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.


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

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