From: Jason Xing <kernelxing@tencent.com>
Date: Thu, 18 Apr 2024 07:36:03 +0000 (+0800)
Subject: net: rps: locklessly access rflow->cpu
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f7b60cce847036f4a639d44c675553a564d8e876;p=linux.git

net: rps: locklessly access rflow->cpu

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

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/dev.c b/net/core/dev.c
index 182fce2537d4a..8bdc59074b29c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4539,7 +4539,7 @@ 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;
 }