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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

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@xxxxxxxxxx>
> > Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
> > Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> > Cc: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
> > ---
> >  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@xxxxxxxxxxxxxx>
> Tested-By: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxx>



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