linux-kernel - Re: [RFC: PATCH] err.h: silence warning when using IS_ERR on void _

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Date:	Thu, 13 Jun 2013 20:24:48 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Sachin Kamat <sachin.kamat@...aro.org>
Cc:	Marc Kleine-Budde <mkl@...gutronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [RFC: PATCH] err.h: silence warning when using IS_ERR on void
 __iomem *

On Thu, Jun 13, 2013 at 10:55:17AM +0530, Sachin Kamat wrote:
> On 13 June 2013 03:01, Marc Kleine-Budde <mkl@...gutronix.de> wrote:
> > Commit 75096579c3ac ("lib: devres: Introduce devm_ioremap_resource()")
> > introduced devm_ioremap_resource() and encourage to check its return value with
> > IS_ERR(). This however leads to the following sparse warnings, as
> > devm_ioremap_resource() returns a void __iomem pointer:
> >
> > drivers/net/can/c_can/c_can_platform.c:205:32: warning: incorrect type in argument 1 (different address spaces)
> > drivers/net/can/c_can/c_can_platform.c:205:32:    expected void const *ptr
> > drivers/net/can/c_can/c_can_platform.c:205:32:    got unsigned int [noderef] [usertype] <asn:2>*raminit_ctrlreg
> 
> CC ing Thierry who has solved this issue some time back.

I had sent two patches, one against sparse, the other against the
kernel, but none were picked up yet.

Thierry

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