linux-kernel - Re: [PATCH 1/3] xen: off by one error in xen/setup.c

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Message-ID: <alpine.LNX.2.00.1108030821320.4521@swampdragon.chaosbits.net>
Date:	Wed, 3 Aug 2011 08:23:05 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	Igor Mammedov <imammedo@...hat.com>
cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] xen: off by one error in xen/setup.c

On Wed, 3 Aug 2011, Igor Mammedov wrote:

> On 08/02/2011 07:07 PM, Konrad Rzeszutek Wilk wrote:
> > On Tue, Aug 02, 2011 at 11:45:23AM +0200, Igor Mammedov wrote:
> > > Do not try to initialize pfn beyond of available address space.
> > > 
> > > Signed-off-by: Igor Mammedov<imammedo@...hat.com>
> > > ---
> > >   arch/x86/xen/setup.c |    2 +-
> > >   1 files changed, 1 insertions(+), 1 deletions(-)
> > > 
> > > diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
> > > index 60aeeb5..2221b05 100644
> > > --- a/arch/x86/xen/setup.c
> > > +++ b/arch/x86/xen/setup.c
> > > @@ -69,7 +69,7 @@ static void __init xen_add_extra_mem(unsigned long
> > > pages)
> > > 
> > >   	xen_max_p2m_pfn = PFN_DOWN(extra_start + size);
> > > 
> > > -	for (pfn = PFN_DOWN(extra_start); pfn<= xen_max_p2m_pfn; pfn++)
> > > +	for (pfn = PFN_DOWN(extra_start); pfn<  xen_max_p2m_pfn; ++pfn)
> > >   		__set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
> > 
> > Did this actually break anything?
> 
> Not really, but for the sake of correctness and as cleanup it's good idea.
> 

Ok I'm really, really nitpicking here, but if it's supposed to "clean up", 
wouldn't this:

  for (pfn = PFN_DOWN(extra_start); pfn < xen_max_p2m_pfn; ++pfn)

be preferable (note the spacing around '<') ?

-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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