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Date:   Wed, 3 Apr 2019 05:18:28 -0700
From:   Eric Dumazet <>
To:     Florian Westphal <>,
Subject: Re: [PATCH net-next] net: use correct this_cpu primitive in

On 04/02/2019 11:28 PM, Florian Westphal wrote:
> syzbot reports:
> BUG: using __this_cpu_read() in preemptible code:
> caller is dev_recursion_level include/linux/netdevice.h:3052 [inline]
>  __this_cpu_preempt_check+0x246/0x270 lib/smp_processor_id.c:47
>  dev_recursion_level include/linux/netdevice.h:3052 [inline]
>  ip6_skb_dst_mtu include/net/ip6_route.h:245 [inline]
> I erronously downgraded a this_cpu_read to __this_cpu_read when
> moving dev_recursion_level() around.

Reviewed-by: Eric Dumazet <>

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