linux-kernel - Re: [PATCH][net-next] xdp: remove redundant variable 'headroom'

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Message-ID: <ec579a7c-345b-f462-95ac-f36de1072614@intel.com>
Date:   Thu, 30 Aug 2018 16:37:50 +0200
From:   Björn Töpel <bjorn.topel@...el.com>
To:     Colin King <colin.king@...onical.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        netdev@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][net-next] xdp: remove redundant variable 'headroom'

On 2018-08-30 16:27, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Variable 'headroom' is being assigned but is never used hence it is
> redundant and can be removed.
> 
> Cleans up clang warning:
> variable ‘headroom’ set but not used [-Wunused-but-set-variable]
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>   net/core/xdp.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/net/core/xdp.c b/net/core/xdp.c
> index 654dbb19707e..4b2b194f4f1f 100644
> --- a/net/core/xdp.c
> +++ b/net/core/xdp.c
> @@ -412,7 +412,7 @@ EXPORT_SYMBOL_GPL(xdp_attachment_setup);
>   
>   struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp)
>   {
> -	unsigned int metasize, headroom, totsize;
> +	unsigned int metasize, totsize;
>   	void *addr, *data_to_copy;
>   	struct xdp_frame *xdpf;
>   	struct page *page;
> @@ -420,7 +420,6 @@ struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp)
>   	/* Clone into a MEM_TYPE_PAGE_ORDER0 xdp_frame. */
>   	metasize = xdp_data_meta_unsupported(xdp) ? 0 :
>   		   xdp->data - xdp->data_meta;
> -	headroom = xdp->data - xdp->data_hard_start;
>   	totsize = xdp->data_end - xdp->data + metasize;
>   
>   	if (sizeof(*xdpf) + totsize > PAGE_SIZE)
> 

This should go via bpf-next. Thanks for the fix!

Acked-by: Björn Töpel <bjorn.topel@...el.com>