linux-kernel - Re: [PATCH 1/8] IB/cxgb4: Fix formatting of physical address

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Date:	Sun, 27 Oct 2013 22:02:13 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Joe Perches <joe@...ches.com>
Cc:	Steve Wise <swise@...lsio.com>, Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-rdma@...r.kernel.org
Subject: Re: [PATCH 1/8] IB/cxgb4: Fix formatting of physical address

On Sun, 2013-10-27 at 14:58 -0700, Joe Perches wrote:
> On Sun, 2013-10-27 at 21:50 +0000, Ben Hutchings wrote:
> > Physical addresses may be wider than virtual addresses (e.g. on i386
> > with PAE) and must not be formatted with %p.
> 
> %pa works.  %pa also prefixes with 0x.

Only as long as pci_resource_start() happens to be an lvalue.  I'd
rather not introduce that assumption.

Ben.

> > diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
> []
> > @@ -602,10 +602,10 @@ static int c4iw_rdev_open(struct c4iw_rdev *rdev)
> >  	     rdev->lldi.vr->qp.size,
> >  	     rdev->lldi.vr->cq.start,
> >  	     rdev->lldi.vr->cq.size);
> > -	PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
> > +	PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
> >  	     "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
> >  	     (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
> > -	     (void *)(unsigned long)pci_resource_start(rdev->lldi.pdev, 2),
> > +	     (u64)pci_resource_start(rdev->lldi.pdev, 2),
> >  	     rdev->lldi.db_reg,
> >  	     rdev->lldi.gts_reg,
> >  	     rdev->qpshift, rdev->qpmask,
> > 
> > 
> 
> 
> 

-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

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