linux-kernel - Re: [PATCH 3/4] freezer_cg: use thaw_process() in unfreeze

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Date:	Wed, 22 Oct 2008 09:37:04 +0200
From:	Cedric Le Goater <clg@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	lizf@...fujitsu.com, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] freezer_cg: use thaw_process() in unfreeze_cgroup()

Andrew Morton wrote:
> On Tue, 21 Oct 2008 09:16:08 +0200
> Cedric Le Goater <clg@...ibm.com> wrote:
> 
>> Li Zefan wrote:
>>> Don't duplicate the implementation of thaw_process().
>> looks OK but you should remove  __thaw_process() which is unused 
>> now.
> 
> It's called by thaw_process().
> 
> But that's the only callsite, I believe, so...

yes it is. it was added by dc52ddc0e6f45b04780b26fc0813509f8e798c42
and was inline before.

thanks,

C.

> 
> --- a/include/linux/freezer.h~freezer_cg-use-thaw_process-in-unfreeze_cgroup-fix
> +++ a/include/linux/freezer.h
> @@ -44,11 +44,6 @@ static inline bool should_send_signal(st
>  	return !(p->flags & PF_FREEZER_NOSIG);
>  }
>  
> -/*
> - * Wake up a frozen process
> - */
> -extern int __thaw_process(struct task_struct *p);
> -
>  /* Takes and releases task alloc lock using task_lock() */
>  extern int thaw_process(struct task_struct *p);
>  
> diff -puN kernel/freezer.c~freezer_cg-use-thaw_process-in-unfreeze_cgroup-fix kernel/freezer.c
> --- a/kernel/freezer.c~freezer_cg-use-thaw_process-in-unfreeze_cgroup-fix
> +++ a/kernel/freezer.c
> @@ -121,16 +121,7 @@ void cancel_freezing(struct task_struct 
>  	}
>  }
>  
> -/*
> - * Wake up a frozen process
> - *
> - * task_lock() is needed to prevent the race with refrigerator() which may
> - * occur if the freezing of tasks fails.  Namely, without the lock, if the
> - * freezing of tasks failed, thaw_tasks() might have run before a task in
> - * refrigerator() could call frozen_process(), in which case the task would be
> - * frozen and no one would thaw it.
> - */
> -int __thaw_process(struct task_struct *p)
> +static int __thaw_process(struct task_struct *p)
>  {
>  	if (frozen(p)) {
>  		p->flags &= ~PF_FROZEN;
> @@ -140,6 +131,15 @@ int __thaw_process(struct task_struct *p
>  	return 0;
>  }
>  
> +/*
> + * Wake up a frozen process
> + *
> + * task_lock() is needed to prevent the race with refrigerator() which may
> + * occur if the freezing of tasks fails.  Namely, without the lock, if the
> + * freezing of tasks failed, thaw_tasks() might have run before a task in
> + * refrigerator() could call frozen_process(), in which case the task would be
> + * frozen and no one would thaw it.
> + */
>  int thaw_process(struct task_struct *p)
>  {
>  	task_lock(p);
> _
> 
> --
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