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    SubjectRe: [PATCH] [POWERPC] Improve (in|out)_beXX() asm code
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    On Tue, 2008-05-20 at 16:38 -0500, Scott Wood wrote:
    > It looks like we rely on -fno-strict-aliasing to prevent reordering
    > ordinary memory accesses (such as to DMA descriptors) past the I/O
    > access. It won't prevent reordering of memory reads around an I/O
    > read,
    > though, which could be a problem if the I/O read result determines
    > the
    > validity of the DMA buffer. IMHO, a memory clobber would be better.

    We probably want a full "memory" clobber then...

    Ben.




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