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

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Message-ID: <20200927225519.GB2800828@google.com>
Date:   Sun, 27 Sep 2020 18:55:19 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     "Paul E. McKenney" <paulmck@...nel.org>, 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 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>

thanks,

 - Joel

>  			cond_resched_tasks_rcu_qs();
>  		}