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

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Date:	Thu, 27 Mar 2014 13:52:18 +0100
From:	Sander Eikelenboom <linux@...elenboom.it>
To:	Paul Durrant <paul.durrant@...rix.com>
CC:	xen-devel@...ts.xen.org, netdev@...r.kernel.org,
	Ian Campbell <ian.campbell@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>
Subject: Re: [PATCH net 1/3] xen-netback: remove pointless clause from if statement


Thursday, March 27, 2014, 1:23:06 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 |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)

> diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
> index 438d0c0..befc413 100644
> --- a/drivers/net/xen-netback/netback.c
> +++ b/drivers/net/xen-netback/netback.c
> @@ -192,8 +192,7 @@ 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)
> +       if ((offset + size > MAX_BUFFER_OFFSET) && offset && !head)
>                 return true;
>  
>         return false;


Will put this through the test now ..

--
Sander

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