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Date: Fri, 8 Sep 2006 20:54:08 -0700 (PDT)
From: Linus Torvalds <torvalds@...l.org>
To: Paul Mackerras <paulus@...ba.org>
cc: linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
akpm@...l.org, segher@...nel.crashing.org, davem@...emloft.net
Subject: Re: Opinion on ordering of writel vs. stores to RAM
On Sat, 9 Sep 2006, Paul Mackerras wrote:
> >
> > although it's quite possible that (a) never makes any sense at all.
>
> Do you mean (b) never makes sense?
Yes.
> I suspect the best thing at this point is to move the sync in writeX()
> before the store, as you suggest, and add an "eieio" before the load
> in readX(). That does mean that we are then relying on driver writers
> putting in the mmiowb() between a writeX() and a spin_unlock, but at
> least that is documented.
Yeah, that sounds reasonable.
Linus
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