lkml.org 
[lkml]   [2011]   [Feb]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    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.

    -hpa

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



    \
     
     \ /
      Last update: 2011-02-03 05:25    [W:0.018 / U:61.460 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site