On Saturday, September 18, 2004 10:57 am, Matthew Wilcox wrote:
> On Sat, Sep 18, 2004 at 12:10:01AM -0600, Grant Grundler wrote:
> > Jesse Barnes wrote:
> > ...
> >
> > > Btw Andrew (Vasquez), there's a small doc I put together that should
> > > describe when you have to worry about PCI posting.  It's in the tree:
> > > Documentation/io_ordering.txt.  If it's incomplete or confusing, just
> > > let me know and I'll update it.
> >
> > Jesse,
> > Both. incomplete and confusing.
> > "concrete example of a hypothetical driver" wasn't my first warning
> > this document needed work. :^)
>
> Not just incomplete and confusing, but actively wrong.  spin_lock/
> spin_unlock should imply ordering of readb().  What you're describing
> there is __readb().  See Documentation/DocBook/deviceiobook.tmpl.  Also,
> rmb() should ensure ordering of io reads; there should be no need to
> touch the device.

Is this any better?  I just sent it off to Grant too.

Thanks,
Jesse