linux-kernel - Re: [PATCH v3 tip/core/rcu 0/14] Sparse-related updates for 3.13

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Message-ID: <20131012065326.GG15339@leaf>
Date:	Fri, 11 Oct 2013 23:53:27 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	darren@...art.com, fweisbec@...il.com, sbw@....edu,
	fengguang.wu@...el.com, stephen@...workplumber.org,
	davem@...emloft.net, bridge@...ts.linux-foundation.org,
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	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	linville@...driver.com, johannes@...solutions.net
Subject: Re: [PATCH v3 tip/core/rcu 0/14] Sparse-related updates for 3.13

On Fri, Oct 11, 2013 at 04:16:59PM -0700, Paul E. McKenney wrote:
> Changes from v2:
> 
> o	Switch from rcu_assign_pointer() to ACCESS_ONCE() given that
> 	the pointers are all --rcu and already visible to readers,
> 	as suggested by Eric Dumazet and Josh Triplett.

Hang on a moment.  Do *none* of these cases need write memory barriers?

- Josh Triplet
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