linux-kernel - Re: [PATCH 4/4] PM: convert do_each_thread to for_each_process

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Date:	Tue, 21 Oct 2014 14:10:18 +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 4/4] PM: convert do_each_thread to for_each_process_thread

On Tuesday, October 21, 2014 09:27:15 AM Michal Hocko wrote:
> as per 0c740d0afc3b (introduce for_each_thread() to replace the buggy
> while_each_thread()) get rid of do_each_thread { } while_each_thread()
> construct and replace it by a more error prone for_each_thread.
> 
> This patch doesn't introduce any user visible change.
> 
> Suggested-by: Oleg Nesterov <oleg@...hat.com>
> Signed-off-by: Michal Hocko <mhocko@...e.cz>

ACK

Or do you want me to handle this series?

> ---
>  kernel/power/process.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/kernel/power/process.c b/kernel/power/process.c
> index a397fa161d11..7fd7b72554fe 100644
> --- a/kernel/power/process.c
> +++ b/kernel/power/process.c
> @@ -46,13 +46,13 @@ static int try_to_freeze_tasks(bool user_only)
>  	while (true) {
>  		todo = 0;
>  		read_lock(&tasklist_lock);
> -		do_each_thread(g, p) {
> +		for_each_process_thread(g, p) {
>  			if (p == current || !freeze_task(p))
>  				continue;
>  
>  			if (!freezer_should_skip(p))
>  				todo++;
> -		} while_each_thread(g, p);
> +		}
>  		read_unlock(&tasklist_lock);
>  
>  		if (!user_only) {
> @@ -93,11 +93,11 @@ static int try_to_freeze_tasks(bool user_only)
>  
>  		if (!wakeup) {
>  			read_lock(&tasklist_lock);
> -			do_each_thread(g, p) {
> +			for_each_process_thread(g, p) {
>  				if (p != current && !freezer_should_skip(p)
>  				    && freezing(p) && !frozen(p))
>  					sched_show_task(p);
> -			} while_each_thread(g, p);
> +			}
>  			read_unlock(&tasklist_lock);
>  		}
>  	} else {
> @@ -219,11 +219,11 @@ void thaw_processes(void)
>  	thaw_workqueues();
>  
>  	read_lock(&tasklist_lock);
> -	do_each_thread(g, p) {
> +	for_each_process_thread(g, p) {
>  		/* No other threads should have PF_SUSPEND_TASK set */
>  		WARN_ON((p != curr) && (p->flags & PF_SUSPEND_TASK));
>  		__thaw_task(p);
> -	} while_each_thread(g, p);
> +	}
>  	read_unlock(&tasklist_lock);
>  
>  	WARN_ON(!(curr->flags & PF_SUSPEND_TASK));
> @@ -246,10 +246,10 @@ void thaw_kernel_threads(void)
>  	thaw_workqueues();
>  
>  	read_lock(&tasklist_lock);
> -	do_each_thread(g, p) {
> +	for_each_process_thread(g, p) {
>  		if (p->flags & (PF_KTHREAD | PF_WQ_WORKER))
>  			__thaw_task(p);
> -	} while_each_thread(g, p);
> +	}
>  	read_unlock(&tasklist_lock);
>  
>  	schedule();
> 

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