netdev - [PATCH v3 net-next 1/7] drivers: net: smc91x: Fix set but unused W=1 warning

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Date:   Tue, 10 Nov 2020 04:02:42 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>, Nicolas Pitre <nico@...xnic.net>,
        Andrew Lunn <andrew@...n.ch>
Subject: [PATCH v3 net-next 1/7] drivers: net: smc91x: Fix set but unused W=1 warning

drivers/net/ethernet/smsc/smc91x.c:706:51: warning: variable ‘pkt_len’ set but not used [-Wunused-but-set-variable]
  706 |  unsigned int saved_packet, packet_no, tx_status, pkt_len;

The read of the packet length in the descriptor probably needs to be
kept in order to keep the hardware happy. So tell the compiler we
don't expect to use the value by using the __always_unused attribute.

Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/ethernet/smsc/smc91x.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/smsc/smc91x.c b/drivers/net/ethernet/smsc/smc91x.c
index f6b73afd1879..c8dabeaab4fc 100644
--- a/drivers/net/ethernet/smsc/smc91x.c
+++ b/drivers/net/ethernet/smsc/smc91x.c
@@ -703,7 +703,8 @@ static void smc_tx(struct net_device *dev)
 {
 	struct smc_local *lp = netdev_priv(dev);
 	void __iomem *ioaddr = lp->base;
-	unsigned int saved_packet, packet_no, tx_status, pkt_len;
+	unsigned int saved_packet, packet_no, tx_status;
+	unsigned int pkt_len __always_unused;
 
 	DBG(3, dev, "%s\n", __func__);
 
-- 
2.29.2