netdev - Re: [RFC] virtio_net: add local_bh_disable() around u64_stats_update

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Message-ID: <4849237d-38f5-9840-4ab9-4419de31db85@lab.ntt.co.jp>
Date:   Thu, 18 Oct 2018 18:00:05 +0900
From:   Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Jason Wang <jasowang@...hat.com>
Cc:     netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        tglx@...utronix.de, "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [RFC] virtio_net: add local_bh_disable() around
 u64_stats_update_begin

On 2018/10/18 17:47, Sebastian Andrzej Siewior wrote:
> On 2018-10-17 14:48:02 [+0800], Jason Wang wrote:
>>
>> On 2018/10/17 上午9:13, Toshiaki Makita wrote:
>>> I'm not sure what condition triggered this warning.
> 
> If the seqlock is acquired once in softirq and then in process context
> again it is enough evidence for lockdep to trigger this warning.

No. As I said that should not happen because of NAPI guard.

-- 
Toshiaki Makita