linux-kernel - Re: [PATCH tip/core/rcu 18/28] jbd2,rcu: Convert call_rcu(free_devcache) to kfree

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Date:	Wed, 8 Jun 2011 12:47:45 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 18/28] jbd2,rcu: Convert
 call_rcu(free_devcache) to kfree_rcu()

On Wed, Jun 08, 2011 at 09:34:31PM +0200, Jan Kara wrote:
> On Wed 08-06-11 12:29:57, Paul E. McKenney wrote:
> > From: Lai Jiangshan <laijs@...fujitsu.com>
> > 
> > The rcu callback free_devcache() just calls a kfree(),
> > so we use kfree_rcu() instead of the call_rcu(free_devcache).
> > 
> > Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > Cc: Andrew Morton <akpm@...ux-foundation.org>
> > Cc: Jan Kara <jack@...e.cz>
> > Reviewed-by: Josh Triplett <josh@...htriplett.org>
>   Acked-by: Jan Kara <jack@...e.cz>

Thank you, Jan!

						Thanx, Paul

> 								Honza
> > ---
> >  fs/jbd2/journal.c |    7 +------
> >  1 files changed, 1 insertions(+), 6 deletions(-)
> > 
> > diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> > index e0ec3db..13fb464 100644
> > --- a/fs/jbd2/journal.c
> > +++ b/fs/jbd2/journal.c
> > @@ -2390,11 +2390,6 @@ struct devname_cache {
> >  static struct devname_cache *devcache[1 << CACHE_SIZE_BITS];
> >  static DEFINE_SPINLOCK(devname_cache_lock);
> >  
> > -static void free_devcache(struct rcu_head *rcu)
> > -{
> > -	kfree(rcu);
> > -}
> > -
> >  const char *jbd2_dev_to_name(dev_t device)
> >  {
> >  	int	i = hash_32(device, CACHE_SIZE_BITS);
> > @@ -2423,7 +2418,7 @@ const char *jbd2_dev_to_name(dev_t device)
> >  			spin_unlock(&devname_cache_lock);
> >  			return ret;
> >  		}
> > -		call_rcu(&devcache[i]->rcu, free_devcache);
> > +		kfree_rcu(devcache[i], rcu);
> >  	}
> >  	devcache[i] = new_dev;
> >  	devcache[i]->device = device;
> > -- 
> > 1.7.3.2
> > 
> -- 
> Jan Kara <jack@...e.cz>
> SUSE Labs, CR
> --
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