[lkml]   [2007]   [Aug]   [15]   [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
    Christoph Lameter writes:

    > A volatile default would disable optimizations for atomic_read.
    > atomic_read without volatile would allow for full optimization by the
    > compiler. Seems that this is what one wants in many cases.

    Name one such case.

    An atomic_read should do a load from memory. If the programmer puts
    an atomic_read() in the code then the compiler should emit a load for
    it, not re-use a value returned by a previous atomic_read. I do not
    believe it would ever be useful for the compiler to collapse two
    atomic_read statements into a single load.

    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: 2007-08-16 04:27    [W:0.019 / U:2.792 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site