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

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Date:	Tue, 30 Mar 2010 10:25:42 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Howells <dhowells@...hat.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 Tue, Mar 30, 2010 at 07:04:31PM +0200, Eric Dumazet wrote:
> Le mardi 30 mars 2010 à 09:49 -0700, Paul E. McKenney a écrit :
> > On Tue, Mar 30, 2010 at 05:39:11PM +0100, David Howells wrote:
> > > Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> > > 
> > > > Scrap this one -- Arnd has it covered, under the much better name
> > > > of rcu_dereference_const().
> > > 
> > > Not convinced of that name either.  That sounds like the RCU dereference of
> > > constant (R/O) data.
> > 
> > Which it is, as long as the lock is held.
> > 
> > But what name would you suggest?
> > 
> 
> Maybe use 'protected' word or something like that, or 'owned', ...
> 
> rcu_dereference_protected() or rcu_dereference_owned()

I do like rcu_dereference_protected() -- a bit longer than
rcu_dereference_locked(), but covers the initialization and cleanup
accesses that might be protected by privatization rather than by locking.

Other thoughts?

							Thanx, Paul
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