netdev - [PATCH net-next v3 3/3] net: rps: locklessly access rflow->cpu

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Message-Id: <20240418073603.99336-4-kerneljasonxing@gmail.com>
Date: Thu, 18 Apr 2024 15:36:03 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	davem@...emloft.net,
	horms@...nel.org
Cc: netdev@...r.kernel.org,
	kerneljasonxing@...il.com,
	Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next v3 3/3] net: rps: locklessly access rflow->cpu

From: Jason Xing <kernelxing@...cent.com>

This is the last member in struct rps_dev_flow which should be
protected locklessly. So finish it.

Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index ed6efef01582..8010036c07b6 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4533,7 +4533,7 @@ set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
 		rps_input_queue_tail_save(&rflow->last_qtail, head);
 	}
 
-	rflow->cpu = next_cpu;
+	WRITE_ONCE(rflow->cpu, next_cpu);
 	return rflow;
 }
 
-- 
2.37.3