linux-kernel - Re: [PATCH] NFS: Fix RCU warnings in nfs_inode_return_delegation

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Message-ID: <20100329223609.GR2569@linux.vnet.ibm.com>
Date:	Mon, 29 Mar 2010 15:36:09 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, Trond.Myklebust@...app.com,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] NFS: Fix RCU warnings in
 nfs_inode_return_delegation_noreclaim() [ver #2]

On Mon, Mar 29, 2010 at 11:22:30PM +0100, David Howells wrote:
> Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > And rcu_dereference_raw() is the same as the old rcu_dereference().
> 
> Exactly.  That's the other half of the issue - that interpolates a redundant
> memory barrier.

Only on Alpha.  Otherwise only a volatile access.

							Thanx, Paul
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