Andi Kleen <[email protected]> wrote:
> Actually gcc is free to reorder it
> (often it will not when it cannot prove that they don't alias, but sometimes
> it can)
Yeah... I have mentioned the fact that compilers can reorder too, but
obviously not enough.
> You're not supposed to do it this way anyways. The official way to access
> MMIO space is using read/write[bwlq]
True, I suppose. I should make it clear that these accessor functions imply
memory barriers, if indeed they do, and that you should use them rather than
accessing I/O registers directly (at least, outside the arch you should).
David
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