linux-kernel - Re: [PATCH 6/9] virtio_mmio: Cast &resources[1].start to ‘unsigned int *’ to rid compiler warning

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Date:	Mon, 5 Nov 2012 09:21:16 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 6/9] virtio_mmio: Cast &resources[1].start to ‘unsigned int *’ to rid compiler warning

On Mon, 05 Nov 2012, Rusty Russell wrote:

> Lee Jones <lee.jones@...aro.org> writes:
> > drivers/virtio/virtio_mmio.c: In function ‘vm_cmdline_set’:
> > drivers/virtio/virtio_mmio.c:535:4: warning: format ‘%u’ expects argument of type ‘unsigned int *’, but argument 4 has type ‘resource_size_t *’ [-Wformat]
> >
> > Cc: Rusty Russell <rusty@...tcorp.com.au>
> > Cc: virtualization@...ts.linux-foundation.org
> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > ---
> >  drivers/virtio/virtio_mmio.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> > index 6b1b7e1..077e9ca 100644
> > --- a/drivers/virtio/virtio_mmio.c
> > +++ b/drivers/virtio/virtio_mmio.c
> > @@ -531,7 +531,7 @@ static int vm_cmdline_set(const char *device,
> >  	resources[0].end = memparse(device, &str) - 1;
> >  
> >  	processed = sscanf(str, "@%lli:%u%n:%d%n",
> > -			&base, &resources[1].start, &consumed,
> > +			&base, (unsigned int *)&resources[1].start, &consumed,
> >  			&vm_cmdline_id, &consumed);
> 
> This suppresses a valid warning, leaving our code no less wrong than
> before.  But now it's silently wrong!
> 
> Do you want to try again?

For sure I'll try again.

How does `s/%u/%p/` suit?

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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