linux-kernel - Re: [PATCH 1/1] dma: pl330: Convert to devm_ioremap

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Date:	Thu, 31 Jan 2013 09:13:05 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Sachin Kamat <sachin.kamat@...aro.org>
Cc:	linux-kernel@...r.kernel.org, Vinod Koul <vinod.koul@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 1/1] dma: pl330: Convert to devm_ioremap_resource()

On Thu, Jan 31, 2013 at 01:39:59PM +0530, Sachin Kamat wrote:
> On 31 January 2013 12:58, Thierry Reding
> <thierry.reding@...onic-design.de> wrote:
> > On Thu, Jan 31, 2013 at 12:37:04PM +0530, Sachin Kamat wrote:
> >> Use the newly introduced devm_ioremap_resource() instead of
> >> devm_request_and_ioremap() which provides more consistent error handling.
> >>
> >> Signed-off-by: Sachin Kamat <sachin.kamat@...aro.org>
> >> Cc: Vinod Koul <vinod.koul@...el.com>
> >> Cc: Thierry Reding <thierry.reding@...onic-design.de>
> >> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> >> ---
> >> This change is based against linux-next tree (20130128).
> >> This change however introduces the followign sparse warning:
> >> drivers/dma/pl330.c:2883:22: warning: incorrect type in argument 1 (different address spaces)
> >> drivers/dma/pl330.c:2883:22:    expected void const *ptr
> >> drivers/dma/pl330.c:2883:22:    got void [noderef] <asn:2>*base
> >> drivers/dma/pl330.c:2884:34: warning: incorrect type in argument 1 (different address spaces)
> >> drivers/dma/pl330.c:2884:34:    expected void const *ptr
> >> drivers/dma/pl330.c:2884:34:    got void [noderef] <asn:2>*base
> >
> > Yes, those are false positives. They can be fixed with the two patches I
> > posted a few hours ago, starting here:
> >
> >         https://lkml.org/lkml/2013/1/30/455
> 
> OK. That's great.
> >
> > Note that the first patch is against sparse. The problem, in a nutshell,
> > is that sparse complains that the pointer address spaces and noderef
> > attributes differ. In the case of the IS_ERR() function and friends the
> > attributes aren't relevant because only the pointer value is only used
> > arithmetically. Unfortunately there is no way you can cast away these
> > attributes without causing other warnings, so the solution is somewhat
> > more complex.
> 
> Thanks for the explaination.
> However, is the patch for the dma relevant?

Yes, I forgot to add my Reviewed-by. Done now.

Thierry

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