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

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

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