netdev - Re: [PATCH 01/10] ext4: Use rcu_barrier() on module unload.

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Message-ID: <20090706023113.GE6706@mit.edu>
Date:	Sun, 5 Jul 2009 22:31:13 -0400
From:	Theodore Tso <tytso@....edu>
To:	Jesper Dangaard Brouer <hawk@...x.dk>
Cc:	"David S. Miller" <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dougthompson@...ssion.com, bluesmoke-devel@...ts.sourceforge.net,
	axboe@...nel.dk, Patrick McHardy <kaber@...sh.net>,
	christine.caulfield@...glemail.com, Trond.Myklebust@...app.com,
	linux-wireless@...r.kernel.org, johannes@...solutions.net,
	yoshfuji@...ux-ipv6.org, shemminger@...ux-foundation.org,
	linux-nfs@...r.kernel.org, bfields@...ldses.org, neilb@...e.de,
	linux-ext4@...r.kernel.org, adilger@....com,
	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH 01/10] ext4: Use rcu_barrier() on module unload.

On Tue, Jun 23, 2009 at 05:03:59PM +0200, Jesper Dangaard Brouer wrote:
> The ext4 module uses rcu_call() thus it should use rcu_barrier()on
> module unload.
> 
> The kmem cache ext4_pspace_cachep is sometimes free'ed using
> call_rcu() callbacks.  Thus, we must wait for completion of call_rcu()
> before doing kmem_cache_destroy().
> 
> I have difficult determining if no new call_rcu() callbacks can be envoked.
> Would the maintainer please verify this?

Yes, that's correct.  Thanks; I've included this in the ext4 patch
queue.

						- Ted
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