netdev - Re: For 3.14 [PATCH v3 net 1/3] xen-netback: remove pointless clause from if statement

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Message-ID: <1396011527.8670.42.camel@kazak.uk.xensource.com>
Date:	Fri, 28 Mar 2014 12:58:47 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Sander Eikelenboom <linux@...elenboom.it>
CC:	Paul Durrant <paul.durrant@...rix.com>,
	"David S. Miller" <davem@...emloft.net>, <xen-devel@...ts.xen.org>,
	<netdev@...r.kernel.org>, "Wei Liu" <wei.liu2@...rix.com>
Subject: Re: For 3.14  [PATCH v3 net 1/3] xen-netback: remove pointless
 clause from if statement

On Fri, 2014-03-28 at 13:45 +0100, Sander Eikelenboom wrote:
> Friday, March 28, 2014, 12:39:05 PM, you wrote:
> 
> > This patch removes a test in start_new_rx_buffer() that checks whether
> > a copy operation is less than MAX_BUFFER_OFFSET in length, since
> > MAX_BUFFER_OFFSET is defined to be PAGE_SIZE and the only caller of
> > start_new_rx_buffer() already limits copy operations to PAGE_SIZE or less.
> 
> > Signed-off-by: Paul Durrant <paul.durrant@...rix.com>
> > Cc: Ian Campbell <ian.campbell@...rix.com>
> > Cc: Wei Liu <wei.liu2@...rix.com>
> > Cc: Sander Eikelenboom <linux@...elenboom.it>
> > ---
> >  drivers/net/xen-netback/netback.c |    4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> > diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
> > index 438d0c0..72314c7 100644
> > --- a/drivers/net/xen-netback/netback.c
> > +++ b/drivers/net/xen-netback/netback.c
> > @@ -192,8 +192,8 @@ static bool start_new_rx_buffer(int offset, unsigned long size, int head)
> >          * into multiple copies tend to give large frags their
> >          * own buffers as before.
> >          */
> > -       if ((offset + size > MAX_BUFFER_OFFSET) &&
> > -           (size <= MAX_BUFFER_OFFSET) && offset && !head)
> > +       BUG_ON(size > MAX_BUFFER_OFFSET);
> > +       if ((offset + size > MAX_BUFFER_OFFSET) && offset && !head)
> >                 return true;
> >  
> >         return false;
> 
> For the whole v3 series:
> 
> Reported-By: Sander Eikelenboom <linux@...elenboom.it>
> Tested-By: Sander Eikelenboom <linux@...elenboom.it>
> 
> CC'ed Dave to get his attention since this is a last minute for 3.14.

All three patches: Acked-by: Ian Campbell <ian.campbell@...rix.com>


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