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

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Message-Id: <20180830142718.10850-1-colin.king@canonical.com>
Date:   Thu, 30 Aug 2018 15:27:18 +0100
From:   Colin King <colin.king@...onical.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Björn Töpel <bjorn.topel@...el.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][net-next] xdp: remove redundant variable 'headroom'

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)
-- 
2.17.1