netdev - [RFC] use smp_load_acquire()/smp_store

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Message-ID: <1414594159.631.85.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 29 Oct 2014 07:49:19 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...hat.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Stephen Ko <stephen.s.ko@...el.com>
Subject: [RFC] use smp_load_acquire()/smp_store_release()

Hi Alexander

The memory barriers added in commit
b37c0fbe3f6dfba1f8ad2aed47fb40578a254635
("net: Add memory barriers to prevent possible race in byte queue
limits")

have heavy cost.

It seems we could use smp_load_acquire() and smp_store_release()
instead ?

I'll post a patch later today. I would be interested if someone was able
to test it, as your commit apparently was tested and known to fix a
reproducible race.

Thanks !


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