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

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Message-Id: <200805290910.07207.arnd@arndb.de>
Date:	Thu, 29 May 2008 09:10:06 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	benh@...nel.crashing.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, linux-arch@...r.kernel.org,
	scottwood@...escale.com, linuxppc-dev@...abs.org,
	alan@...rguk.ukuu.org.uk, linux-kernel@...r.kernel.org,
	tpiepho@...escale.com
Subject: Re: MMIO and gcc re-ordering issue

On Wednesday 28 May 2008, Benjamin Herrenschmidt wrote:
> On Tue, 2008-05-27 at 14:55 -0700, Linus Torvalds wrote:
> > 
> > On Wed, 28 May 2008, Benjamin Herrenschmidt wrote:
> > > 
> > > A problem with __raw_ though is that they -also- don't do byteswap,
> > 
> > Well, that's why there is __readl() and __raw_readl(), no?
> 
> As I replied to somebody else, __readl() is news to me :-) we dont' have
> those on powerpc.
> 

It's not exactly a well-established interface. Only five architectures
define these functions, and there is not a single user in the kernel
source outside of these architecture's io.h files.

	Arnd <><
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