linux-kernel - Re: [patch 24/52] fs: dcache reduce d

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Message-ID: <1277369062.1875.928.camel@laptop>
Date:	Thu, 24 Jun 2010 10:44:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	npiggin@...e.de
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	John Stultz <johnstul@...ibm.com>,
	Frank Mayhar <fmayhar@...gle.com>,
	"Paul E.McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [patch 24/52] fs: dcache reduce d_parent locking

On Thu, 2010-06-24 at 13:02 +1000, npiggin@...e.de wrote:
> Use RCU property of dcache to simplify locking in some places where we
> take d_parent and d_lock.
> 
> Comment: don't need rcu_deref because we take the spinlock and recheck it.

But does the LOCK barrier imply a DATA DEPENDENCY barrier? (It does on
x86, and the compiler barrier implied by spin_lock() suffices to replace
ACCESS_ONCE()).
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