From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexei Starovoitov Date: Fri, 31 Aug 2018 02:50:15 +0000 Subject: Re: [PATCH][net-next] xdp: remove redundant variable 'headroom' Message-Id: <20180831025013.yiukmlw6o7gedevg@ast-mbp> List-Id: References: <20180830142718.10850-1-colin.king@canonical.com> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit To: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= Cc: Colin King , "David S . Miller" , Jesper Dangaard Brouer , netdev@vger.kernel.org, Alexei Starovoitov , "daniel@iogearbox.net" , kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org On Thu, Aug 30, 2018 at 04:37:50PM +0200, Björn Töpel wrote: > On 2018-08-30 16:27, Colin King wrote: > > From: Colin Ian King > > > > 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 > > --- > > 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 Applied, Thanks