linux-kernel - Re: [PATCH] fs-eventpoll: Deletion of unnecessary checks before the function call "__pm_stay

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Date:	Fri, 26 Jun 2015 19:42:13 +0200
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org
CC:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] fs-eventpoll: Deletion of unnecessary checks before the
 function call "__pm_stay_awake"

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Tue, 18 Nov 2014 09:27:16 +0100
> 
> The __pm_stay_awake() 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>
> ---
>  fs/eventpoll.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/eventpoll.c b/fs/eventpoll.c
> index 7bcfff9..eec2e85 100644
> --- a/fs/eventpoll.c
> +++ b/fs/eventpoll.c
> @@ -555,8 +555,7 @@ static inline void ep_pm_stay_awake(struct epitem *epi)
>  {
>  	struct wakeup_source *ws = ep_wakeup_source(epi);
>  
> -	if (ws)
> -		__pm_stay_awake(ws);
> +	__pm_stay_awake(ws);
>  }
>  
>  static inline bool ep_has_wakeup_source(struct epitem *epi)
> @@ -571,8 +570,7 @@ static inline void ep_pm_stay_awake_rcu(struct epitem *epi)
>  
>  	rcu_read_lock();
>  	ws = rcu_dereference(epi->ws);
> -	if (ws)
> -		__pm_stay_awake(ws);
> +	__pm_stay_awake(ws);
>  	rcu_read_unlock();
>  }
>  
> 

How are the chances to integrate this update suggestion
into another source code repository?

Regards,
Markus
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