linux-kernel - Re: [PATCH] serial: atmel: fix compiler warning on address cast

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Message-ID: <20151008093749.GB32532@n2100.arm.linux.org.uk>
Date:	Thu, 8 Oct 2015 10:37:49 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Andre Przywara <andre.przywara@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	Jiri Slaby <jslaby@...e.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] serial: atmel: fix compiler warning on address cast

On Thu, Oct 08, 2015 at 11:01:48AM +0200, Alexandre Belloni wrote:
> On 05/10/2015 at 18:00:52 +0100, Andre Przywara wrote :
> > Turning on KVM and LPAE support on top of a multi_v7_defconfig will
> > produce a compiler warning in the Atmel serial driver:
> > drivers/tty/serial/atmel_serial.c: In function 'atmel_verify_port':
> > drivers/tty/serial/atmel_serial.c:2299:6: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
> >   if ((void *)port->mapbase != ser->iomem_base)
> >       ^
> > 
> > Fix that by using the cast on the right hand side instead, as similar
> > code already does in other drivers.
> > 
> > Signed-off-by: Andre Przywara <andre.przywara@....com>
> Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>

Hmm, this actually points at a problem, and the cast screems out about it.
Think about it, can you guess what it is?

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