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Message-Id: <1281173162-10587-1-git-send-email-xiaosuo@gmail.com> Date: Sat, 7 Aug 2010 17:26:02 +0800 From: Changli Gao <xiaosuo@...il.com> To: "David S. Miller" <davem@...emloft.net> Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Tom Herbert <therbert@...gle.com>, netdev@...r.kernel.org, Changli Gao <xiaosuo@...il.com> Subject: [PATCH] net: disable preemption before call smp_processor_id() Although netif_rx() isn't expected to be called in process context with preemption enabled, it'd better handle this case. And this is why get_cpu() is used in the non-RPS #ifdef branch. If tree RCU is selected, rcu_read_lock() won't disable preemption, so preempt_disable() should be called explictly. Signed-off-by: Changli Gao <xiaosuo@...il.com> --- net/core/dev.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/core/dev.c b/net/core/dev.c index 2b50896..1ae6543 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2517,6 +2517,7 @@ int netif_rx(struct sk_buff *skb) struct rps_dev_flow voidflow, *rflow = &voidflow; int cpu; + preempt_disable(); rcu_read_lock(); cpu = get_rps_cpu(skb->dev, skb, &rflow); @@ -2526,6 +2527,7 @@ int netif_rx(struct sk_buff *skb) ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); rcu_read_unlock(); + preempt_enable(); } #else { -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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