linux-kernel - Re: [Xen-devel] [PATCH 4/5] xen/pciback: Expand the warning message to include domain id.

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Date:	Fri, 6 Jan 2012 11:00:11 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	Jan Beulich <JBeulich@...e.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>
Subject: Re: [Xen-devel] [PATCH 4/5] xen/pciback: Expand the warning message
 to include domain id.

On Fri, Jan 06, 2012 at 03:51:25PM +0000, Ian Campbell wrote:
> On Fri, 2012-01-06 at 15:03 +0000, Konrad Rzeszutek Wilk wrote:
> > On Fri, Jan 06, 2012 at 08:38:09AM +0000, Jan Beulich wrote:
> > > >>> On 05.01.12 at 01:46, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> > > > When a PCI device is transferred to another domain and it is still
> > > > in usage (from the internal perspective), mention which other
> > > > domain is using it to aid in debugging.
> > > > 
> > > > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > > > ---
> > > >  drivers/xen/xen-pciback/xenbus.c |    6 ++++--
> > > >  1 files changed, 4 insertions(+), 2 deletions(-)
> > > > 
> > > > diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
> > > > index 474d52e..fa130bd 100644
> > > > --- a/drivers/xen/xen-pciback/xenbus.c
> > > > +++ b/drivers/xen/xen-pciback/xenbus.c
> > > > @@ -243,8 +243,10 @@ static int xen_pcibk_export_device(struct 
> > > > xen_pcibk_device *pdev,
> > > >  	dev_dbg(&dev->dev, "registering for %d\n", pdev->xdev->otherend_id);
> > > >  	if (xen_register_device_domain_owner(dev,
> > > >  					     pdev->xdev->otherend_id) != 0) {
> > > > -		dev_err(&dev->dev, "device has been assigned to another " \
> > > > -			"domain! Over-writting the ownership, but beware.\n");
> > > > +		int other_domain = xen_find_device_domain_owner(dev);
> > > > +		dev_err(&dev->dev, "device has been assigned to %d " \
> > > > +			"domain! Over-writting the ownership, but beware.\n",
> > > > +			other_domain);
> > > 
> > > As you're touching this anyway, how about fixing the other minor
> > > issues with it too? E.g.
> > > 
> > > 		dev_err(&dev->dev, "Device appears to be assigned to dom%d!"
> > > 			" Overwriting the ownership, but beware.\n",
> > > 			xen_find_device_domain_owner(dev));
> > > 
> > > (a native English speaker may want to comment the "but beware"
> > > part - it reads odd for me).
> > 
> > Hm, lets ask the English speakers. Ian?
> 
> I think you underestimate a native speakers ability to mangle a
> language. Especially this one ;-)
> 
> Anyway, I think it's unnecessary, so you may as well drop it and just
> have:
> 
>  		dev_err(&dev->dev, "Device appears to be assigned to dom%d!"
>  			" Overwriting the ownership.\n",
>  			xen_find_device_domain_owner(dev));
> 
> I suppose you might want "Overriding ownership to dom%d".

OK. To the point and potentially can fit in 80 lines :-).

Will spin out the patch next week-sih.
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