linux-kernel - Re: [PATCH] s390/process: Delete an unnecessary check before the function call "kfree"

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Date:	Thu, 25 Jun 2015 12:02:28 +0200
From:	walter harms <wharms@....de>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
CC:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux390@...ibm.com, linux-s390@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] s390/process: Delete an unnecessary check before the
 function call "kfree"



Am 24.06.2015 22:48, schrieb SF Markus Elfring:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Wed, 24 Jun 2015 22:40:30 +0200
> 
> The kfree() function tests whether its argument is NULL and then
> returns immediately. Thus the test around the call is not needed.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  arch/s390/kernel/process.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
> index dc5edc2..22e6448 100644
> --- a/arch/s390/kernel/process.c
> +++ b/arch/s390/kernel/process.c
> @@ -81,8 +81,7 @@ void release_thread(struct task_struct *dead_task)
>  
>  void arch_release_task_struct(struct task_struct *tsk)
>  {
> -	if (tsk->thread.vxrs)
> -		kfree(tsk->thread.vxrs);
> +	kfree(tsk->thread.vxrs);
>  }
>  
>  int copy_thread(unsigned long clone_flags, unsigned long new_stackp,

maybe the intention was to check tsk != NULL ?

re,
 wh
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