[lkml]   [2007]   [Aug]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH 0/24] make atomic_read() behave consistently across all architectures
    On Fri, 24 Aug 2007, Denys Vlasenko wrote:

    > On Thursday 16 August 2007 00:22, Paul Mackerras wrote:
    > > Satyam Sharma writes:
    > > In the kernel we use atomic variables in precisely those situations
    > > where a variable is potentially accessed concurrently by multiple
    > > CPUs, and where each CPU needs to see updates done by other CPUs in a
    > > timely fashion. That is what they are for. Therefore the compiler
    > > must not cache values of atomic variables in registers; each
    > > atomic_read must result in a load and each atomic_set must result in a
    > > store. Anything else will just lead to subtle bugs.
    > Amen.

    A "timely" fashion? One cannot rely on something like that when coding.
    The visibility of updates is insured by barriers and not by some fuzzy
    notion of "timeliness".
    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: 2007-08-24 19:19    [W:0.019 / U:19.492 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site