linux-kernel - Re: [PATCH 07/10] decnet: Use rcu

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Message-Id: <1246088104.29340.5.camel@localhost.localdomain>
Date:	Sat, 27 Jun 2009 09:35:04 +0200
From:	Jesper Dangaard Brouer <hawk@...x.dk>
To:	Christian Kujau <lists@...dbynature.de>
Cc:	Jesper Dangaard Brouer <hawk@...u.dk>,
	David Miller <davem@...emloft.net>, paulmck@...ux.vnet.ibm.com,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Patrick McHardy <kaber@...sh.net>, yoshfuji@...ux-ipv6.org,
	linux-nfs@...r.kernel.org, linux-ext4@...r.kernel.org,
	catalin.marinas@...il.com
Subject: Re: [PATCH 07/10] decnet: Use rcu_barrier() on module unload.

On Fri, 2009-06-26 at 20:15 -0700, Christian Kujau wrote:
> On Fri, 26 Jun 2009, Jesper Dangaard Brouer wrote:
> > I'll resubmit the patches to you and netdev, to limit the spam effect...
> 
> Out of curiosity: why was linux-ext4 Cc'ed on these rcu_barrier patches
> (but not other fs-lists but linux-nfs)? I did not see any ../fs/ext4/ 
> changes.

There was a ../fs/ext4/ change in patch [01/10].

Titled: "ext4: Use rcu_barrier() on module unload"

git show --stat d6a4ea73b7e8779607dd48735d9a9c521c890857
commit d6a4ea73b7e8779607dd48735d9a9c521c890857
Author: Jesper Dangaard Brouer <hawk@...x.dk>
Date:   Tue Jun 23 15:40:54 2009 +0200

    ext4: Use rcu_barrier() on module unload.
    
    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?
    
    Signed-off-by: Jesper Dangaard Brouer <hawk@...x.dk>

 fs/ext4/mballoc.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

-- 
Med venlig hilsen / Best regards
  Jesper Brouer
  ComX Networks A/S
  Linux Network developer
  Cand. Scient Datalog / MSc.
  Author of http://adsl-optimizer.dk
  LinkedIn: http://www.linkedin.com/in/brouer

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