linux-kernel - Re: MMIO and gcc re-ordering issue

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Message-ID: <20080527215328.GB22636@parisc-linux.org>
Date:	Tue, 27 May 2008 15:53:28 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>, linux-arch@...r.kernel.org,
	scottwood@...escale.com, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, tpiepho@...escale.com
Subject: Re: MMIO and gcc re-ordering issue

On Tue, May 27, 2008 at 10:38:22PM +0100, Alan Cox wrote:
> > re-ordering, even though I doubt it will be visible in practice. So if you 
> > use the "__" versions, you'd better have barriers even on x86!
> 
> Are we also going to have __ioread*/__iowrite* ?

Didn't we already define ioread*() to have loose semantics?

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
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