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    SubjectRe: [tip:x86/urgent] x86: Add memory modify constraints to xchg() and cmpxchg()
    On Tue, Jul 27, 2010 at 10:33 PM, tip-bot for H. Peter Anvin
    <hpa@zytor.com> wrote:
    >
    > x86: Add memory modify constraints to xchg() and cmpxchg()

    Ack. I assume this doesn't really change the code generated? At least
    not with a gcc that honors the whole memory clobber thing properly?

    I also suspect that we can/should get rid of the __xg() thing - it was
    there just to make sure gcc didn't see the memory read as a single
    word and tried to optimize it. With the "+m" it probably doesn't
    matter any more (don't know if it ever did)

    Linus


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