linux-kernel - Re: [PATCH] virtio-net: fix a race on 32bit arches

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Date:	Wed, 06 Jun 2012 22:08:09 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	Jason Wang <jasowang@...hat.com>, netdev@...r.kernel.org,
	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH] virtio-net: fix a race on 32bit arches

On Wed, 2012-06-06 at 22:58 +0300, Michael S. Tsirkin wrote:

> Absolutely, I am talking about virtio here.  I'm not kicking
> u64_stats_sync idea I am just saying that simple locking
> would work for virtio and might be better as it
> gives us a way to get counters atomically.

Which lock do you own in the RX path ?

You'll have to add a lock in fast path. This sounds really a bad choice
to me.


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