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

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Date:	Mon, 31 Mar 2014 11:33:11 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	David Miller <davem@...emloft.net>
CC:	<linux@...elenboom.it>, <paul.durrant@...rix.com>,
	<xen-devel@...ts.xen.org>, <netdev@...r.kernel.org>,
	<wei.liu2@...rix.com>
Subject: Re: For 3.14 [PATCH v3 net 1/3] xen-netback: remove pointless
 clause from if statement

On Sat, 2014-03-29 at 18:52 -0400, David Miller wrote:
> From: Ian Campbell <Ian.Campbell@...rix.com>
> Date: Fri, 28 Mar 2014 12:58:47 +0000
> 
> > 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>
> 
> Ok, we're coming down to the wire so this might not make it, but
> I'll queue it up for -stable and get it merged when I can.

Thanks!



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