linux-kernel - Re: [PATCH 19/24] sh: use _

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Message-Id: <201209180801.48038.arnd@arndb.de>
Date:	Tue, 18 Sep 2012 08:01:47 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Will Deacon <will.deacon@....com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Nicolas Pitre <nico@...aro.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Simon Horman <horms@...ge.net.au>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH 19/24] sh: use __iomem pointers for MMIO

On Tuesday 18 September 2012, Paul Mundt wrote:
> On Fri, Sep 14, 2012 at 11:34:47PM +0200, Arnd Bergmann wrote:
> > ARM is moving to stricter checks on readl/write functions,
> > so we need to use the correct types everywhere.
> > 
> > I'm not completely sure about this patch, and it will
> > probably require some arch/sh changes to go along with it,
> > but it's clear that something has to be done to avoid
> > getting hundreds of new warnings on each shmobile build
> > in v3.7.
> > Please see this as a prototype.
> > 
> I have no intention of making this change for arch/sh.
> 
> The __raw variants already accept both __iomem pointers and integer
> addresses, which was largely intentional. New code could use the __iomem
> annotations while older code could continue to use the integer addresses
> without issue.

Ok, I'm dropping this patch from the series then.

> If you wish to go through the kernel and audit every
> single __raw user, you're certainly welcome to, but until then such a
> change is premature.

I've done it for all the defconfig files for now, which probably covers
most of the drivers that are relevant on ARM. I still have a backlog
of unrelated warning fixes from that. Once I'm done with those, I'm planning
to do another round of randconfig builds, which hopefully catches the
rest. I'll just exclude drivers/sh from those builds for now.

	Arnd

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