linux-kernel - Re: [PATCH 2/4] freezer: remove obsolete comments in __thaw

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Message-ID: <706964547.3XIII6QxY2@vostro.rjw.lan>
Date:	Tue, 21 Oct 2014 14:04:14 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Cong Wang <xiyou.wangcong@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 2/4] freezer: remove obsolete comments in __thaw_task()

On Tuesday, October 21, 2014 09:27:13 AM Michal Hocko wrote:
> From: Cong Wang <xiyou.wangcong@...il.com>
> 
> __thaw_task() no longer clears frozen flag since commit a3201227f803
> (freezer: make freezing() test freeze conditions in effect instead of TIF_FREEZE).
> 
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Reviewed-by: Michal Hocko <mhocko@...e.cz>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

ACK

> ---
>  kernel/freezer.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/kernel/freezer.c b/kernel/freezer.c
> index 8f9279b9c6d7..a8900a3bc27a 100644
> --- a/kernel/freezer.c
> +++ b/kernel/freezer.c
> @@ -150,12 +150,6 @@ void __thaw_task(struct task_struct *p)
>  {
>  	unsigned long flags;
>  
> -	/*
> -	 * Clear freezing and kick @p if FROZEN.  Clearing is guaranteed to
> -	 * be visible to @p as waking up implies wmb.  Waking up inside
> -	 * freezer_lock also prevents wakeups from leaking outside
> -	 * refrigerator.
> -	 */
>  	spin_lock_irqsave(&freezer_lock, flags);
>  	if (frozen(p))
>  		wake_up_process(p);
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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