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

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Message-ID: <20080527224651.671fc454@core>
Date:	Tue, 27 May 2008 22:46:51 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Matthew Wilcox <matthew@....cx>
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, 27 May 2008 15:53:28 -0600
Matthew Wilcox <matthew@....cx> wrote:

> 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?

The ATA layer doesn't think so.

Alan
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