linux-kernel - Re: [Patch v3 2/2] freezer: remove obsolete comments in __thaw

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Message-ID: <20140815082310.GA24624@dhcp22.suse.cz>
Date:	Fri, 15 Aug 2014 10:23:10 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	linux-kernel@...r.kernel.org, David Rientjes <rientjes@...gle.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Patch v3 2/2] freezer: remove obsolete comments in __thaw_task()

On Thu 14-08-14 14:15:26, Cong Wang wrote:
> __thaw_task() no longer clears frozen flag.

since 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>
> Cc: Michal Hocko <mhocko@...e.cz>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Reviewed-by: Michal Hocko <mhocko@...e.cz>

> ---
>  kernel/freezer.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/kernel/freezer.c b/kernel/freezer.c
> index 5b25351..33cbcb0 100644
> --- a/kernel/freezer.c
> +++ b/kernel/freezer.c
> @@ -156,12 +156,6 @@ 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);
> -- 
> 1.8.3.1
> 

-- 
Michal Hocko
SUSE Labs
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