linux-kernel - [PATCH net-next] net: thunderx: remove set but not used variable 'tail'

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Date:   Mon, 23 Mar 2020 14:51:16 +0800
From:   Zheng Zengkai <zhengzengkai@...wei.com>
To:     <sgoutham@...vell.com>, <rrichter@...vell.com>,
        <davem@...emloft.net>, <ast@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        <zhengzengkai@...wei.com>
Subject: [PATCH net-next] net: thunderx: remove set but not used variable 'tail'

From: Zheng zengkai <zhengzengkai@...wei.com>

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/ethernet/cavium/thunder/nicvf_queues.c: In function nicvf_sq_free_used_descs:
drivers/net/ethernet/cavium/thunder/nicvf_queues.c:1182:12: warning:
 variable tail set but not used [-Wunused-but-set-variable]

It's not used since commit 4863dea3fab01("net: Adding support for Cavium ThunderX network controller"),
so remove it.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Zheng zengkai <zhengzengkai@...wei.com>
---
 drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
index 4ab57d33a87e..069e7413f1ef 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
@@ -1179,13 +1179,12 @@ void nicvf_sq_disable(struct nicvf *nic, int qidx)
 void nicvf_sq_free_used_descs(struct net_device *netdev, struct snd_queue *sq,
 			      int qidx)
 {
-	u64 head, tail;
+	u64 head;
 	struct sk_buff *skb;
 	struct nicvf *nic = netdev_priv(netdev);
 	struct sq_hdr_subdesc *hdr;
 
 	head = nicvf_queue_reg_read(nic, NIC_QSET_SQ_0_7_HEAD, qidx) >> 4;
-	tail = nicvf_queue_reg_read(nic, NIC_QSET_SQ_0_7_TAIL, qidx) >> 4;
 	while (sq->head != head) {
 		hdr = (struct sq_hdr_subdesc *)GET_SQ_DESC(sq, sq->head);
 		if (hdr->subdesc_type != SQ_DESC_TYPE_HEADER) {
-- 
2.18.1