[lkml]   [2006]   [Mar]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] Document Linux's memory barriers [try #5]
    Paul E. McKenney <> wrote:

    > smp_mb__before_atomic_dec() and friends as well?

    These seem to be something Sparc64 related; or, at least, Sparc64 seems to do
    something weird with them.

    What are these meant to achieve anyway? They seems to just be barrier() on a
    lot of systems, even SMP ones.

    > Some architectures have more expansive definition of data dependency,
    > including then- and else-clauses being data-dependent on the if-condition,
    > but this is probably too much detail.

    Linus calls that a "control dependency" and doesn't seem to think that's a
    problem as it's sorted out by branch prediction. What you said makes me
    wonder about conditional instructions (such as conditional move).

    Anyway, I've incorporated your comments as well as reworking the document,
    which I'll shortly push upstream once again.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2006-03-23 19:37    [W:0.020 / U:12.496 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site