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

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Date:   Tue, 16 Oct 2018 20:21:48 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        tglx@...utronix.de,
        Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [RFC] virtio_net: add local_bh_disable() around
 u64_stats_update_begin

On 2018-10-16 10:59:30 [-0700], Stephen Hemminger wrote:
> Since there already is u64_stats_update_begin_irqsave inline, why not introduce
> u64_stats_update_begin_bh which encapsulates the local_bh_disable

CPU0				CPU1
refill_work()			virtnet_receive()
 try_fill_recv()		 try_fill_recv()
  u64_stats_update_begin_bh()	  u64_stats_update_begin_bh()

both CPUs may operate on the `rq'.

Sebastian