Matthew Wilcox <[email protected]> wrote:
> > That might be worth an example with an if() because PPC will do this and
> > if its a read with a side effect (eg I/O space) you get singed..
>
> PPC does speculative memory accesses to IO? Are you *sure*?
Can you do speculative reads from frame buffers?
> # define smp_read_barrier_depends() do { } while(0)
What's this one meant to do?
> Port space is deprecated though. PCI 2.3 says:
That's sort of irrelevant for the here. I still need to document the
interaction.
> Since memory write transactions may be posted in bridges anywhere
> in the system, and I/O writes may be posted in the host bus bridge,
I'm not sure whether this is beyond the scope of this document. Maybe the
document's scope needs to be expanded.
David
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