linux-kernel - Re: [PATCH] kvfree_rcu(): fix ifnullfree.cocci warnings

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Message-ID: <20200928140229.GO29330@paulmck-ThinkPad-P72>
Date:   Mon, 28 Sep 2020 07:02:29 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Julia Lawall <julia.lawall@...ia.fr>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>, rcu@...r.kernel.org
Subject: Re: [PATCH] kvfree_rcu(): fix ifnullfree.cocci warnings

On Sun, Sep 27, 2020 at 06:55:19PM -0400, Joel Fernandes wrote:
> On Sun, Sep 27, 2020 at 03:00:29PM +0200, Julia Lawall wrote:
> > From: kernel test robot <lkp@...el.com>
> > 
> > NULL check before kfree is not needed.
> > 
> > Generated by: scripts/coccinelle/free/ifnullfree.cocci
> > 
> > Fixes: e9bed2a1239b ("kvfree_rcu(): Switch to kmalloc() and kfree() for allocations")
> > Signed-off-by: kernel test robot <lkp@...el.com>
> > Signed-off-by: Julia Lawall <julia.lawall@...ia.fr>
> > ---
> > 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git urezki-pcount.2020.09.26a
> > head:   1a8eee1cc5b0e59c17f5d94c5871e6c70c4a43a1
> > commit: e9bed2a1239b017d78cec5de66adce0560f6d077 [17/18] kvfree_rcu(): Switch to kmalloc() and kfree() for allocations
> > :::::: branch date: 4 hours ago
> > :::::: commit date: 15 hours ago
> > 
> >  tree.c |    3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > --- a/kernel/rcu/tree.c
> > +++ b/kernel/rcu/tree.c
> > @@ -3165,8 +3165,7 @@ static void kfree_rcu_work(struct work_s
> >  				bkvhead[i] = NULL;
> >  			krc_this_cpu_unlock(krcp, flags);
> > 
> > -			if (bkvhead[i])
> > -				kfree(bkvhead[i]);
> > +			kfree(bkvhead[i]);
> > 
> 
> Acked-by: Joel Fernandes (Google) <joel@...lfernandes.org>

Applied and pushed, thank you both!

							Thanx, Paul

> thanks,
> 
>  - Joel
> 
> >  			cond_resched_tasks_rcu_qs();
> >  		}