linux-kernel - Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer

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Message-ID: <20070423222358.GA627@tv-sign.ru>
Date:	Tue, 24 Apr 2007 02:23:58 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, ego@...ibm.com,
	linux-kernel@...r.kernel.org, vatsa@...ibm.com, paulmck@...ibm.com,
	pavel@....cz
Subject: Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags

On 04/22, Rafael J. Wysocki wrote:
> 
> Move all of the freezer-related flags to a separate field in task_struct and
> introduce functions to operate them using set_bit() etc.
>
> [...snip...]
>
> --- linux-2.6.21-rc6-mm1.orig/kernel/fork.c	2007-04-22 19:37:42.000000000 +0200
> +++ linux-2.6.21-rc6-mm1/kernel/fork.c	2007-04-22 20:55:01.000000000 +0200
> @@ -922,7 +922,7 @@ static inline void copy_flags(unsigned l
>  {
>  	unsigned long new_flags = p->flags;
>  
> -	new_flags &= ~(PF_SUPERPRIV | PF_NOFREEZE);
> +	new_flags &= ~PF_SUPERPRIV;
>  	new_flags |= PF_FORKNOEXEC;
>  	new_flags |= PF_STARTING;
>  	p->flags = new_flags;

OK, but you forgot to clear p->freezer_flags on copy_process()->dup_task_struct()
path ?

Oleg.

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