lkml.org 
[lkml]   [2007]   [Oct]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRe: [rfc][patch] i386: remove comment about barriers
    Date
    Nick Piggin <npiggin@suse.de> wrote:

    > [ This is true for x86's sfence/lfence, but raises a question about Linux's
    > memory barriers. Does anybody expect that a sequence of smp_wmb and smp_rmb
    > would ever provide a full smp_mb barrier? I've always assumed no, but I
    > don't know if it is actually documented? ]

    I think you have to assume that smp_wmb() only orders stores and write
    barriers, and that smp_rmb() only orders reads and read barriers.

    smp_mb() implies both smp_wmb() and smp_rmb(), but is greater than the
    combination of the two.

    David
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-10-01 15:25    [W:0.020 / U:29.516 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site