linux-kernel - Re: [Xen-devel] [PATCH v2] xen/grant-table: correctly initialize grant table version 1

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Message-ID: <20130110091652.GB6316@u109add4315675089e695.ant.amazon.com>
Date:	Thu, 10 Jan 2013 10:16:53 +0100
From:	Matt Wilson <msw@...zon.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
CC:	ANNIE LI <annie.li@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>
Subject: Re: [Xen-devel] [PATCH v2] xen/grant-table: correctly initialize
 grant table version 1

On Wed, Jan 09, 2013 at 12:02:09PM +0000, Ian Campbell wrote:
> On Wed, 2013-01-09 at 02:40 +0000, ANNIE LI wrote:
> > > @@ -1080,18 +1081,18 @@ static void gnttab_request_version(void)
> > >   		panic("we need grant tables version 2, but only version 1 is available");
> > >   	} else {
> > >   		grant_table_version = 1;
> > > +		grefs_per_grant_frame = PAGE_SIZE / sizeof(struct grant_entry_v1);
> > >   		gnttab_interface =&gnttab_v1_ops;
> > >   	}
> > > -	printk(KERN_INFO "Grant tables using version %d layout.\n",
> > > -		grant_table_version);
> > >   }
> > >   
> > 
> > Is it better to keep printk here? In your last patch, you removed it 
> > because gnttab_request_version and gnttab_resume are all called in 
> > gnttab_init. and gnttab_resume also contains calling of 
> > gnttab_request_version. But in this patch, gnttab_setup is used, and 
> > does not have this issue now.
> 
> Yes, I think we want to print this at both start of day and resume?
> 
> Either by adding a print to gnttab_resume() or by keeping the existing
> one here in preference to moving it to gnttab_setup(). I'd prefer the
> latter to avoid the duplication, unless I'm mistaken and request_version
> is called in more than those two locations.

In this version the printk() is in gnttab_setup(), which is called
both at start of day (gnttab_init()) and resume (gnttab_resume()). I
can move it back to gnttab_request_version() if you'd like, but this
patch should be behaving as expected already.

Matt
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