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

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Message-ID: <20080527223822.57306677@core>
Date:	Tue, 27 May 2008 22:38:22 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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

> 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* ?

Also is the sematics of __readl/__writel defined for all architectures -
I used it ages ago in the i2o drivers for speed and it got removed
because it didn't build on some platforms.

Alan

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