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    SubjectRe: [patch 134/149] x86, paravirt: Add a global synchronization point for pvclock
    On 07/14/2010 11:08 AM, H. Peter Anvin wrote:
    > Noone has talked about strict ordering between volatiles and
    > (non-volatile) memory ops in general. I have been talking about
    > volatile to volatile ordering, and I thought I'd been very clear about that.
    >

    OK.

    > H.J., we're having a debate about the actual semantics of "volatile",
    > especially "asm volatile" in gcc. In particular, I believe that
    > volatile operations should not be possible to reorder with regards to
    > each other, and the kernel depends on that fact.
    >

    I think we should consider that deprecated and rely on dependencies and
    clobbers.

    J


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