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    SubjectRe: [PATCH/RFC] asm-generic/mutex-dec.h: add SMP support
    On Monday 30 May 2011 05:19:28 Mike Frysinger wrote:
    > To make these guys work on SMP systems, we just need to sprinkle a few
    > barriers around.
    > Signed-off-by: Mike Frysinger <>
    > ---
    > note: this is what the Blackfin SMP port is using, but it doesn't seem
    > like other SMP ports are ... so I wonder if we're just trying too hard
    > and these barriers aren't actually necessary ?

    On some architectures, atomic instructions are implicit barriers. On
    others, the cmpxchg() macro contains a barrier. I'm not sure if there
    is other code relying on that.


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