[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20070625152736.GB160@tv-sign.ru>
Date: Mon, 25 Jun 2007 19:27:36 +0400
From: Oleg Nesterov <oleg@...sign.ru>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Nigel Cunningham <nigel@...el.suspend2.net>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Pavel Machek <pavel@....cz>, Uli Luckas <u.luckas@...d.de>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] PM: Prevent frozen user mode helpers from failing the freezing of tasks
On 06/25, Rafael J. Wysocki wrote:
>
> On Monday, 25 June 2007 12:43, Oleg Nesterov wrote:
>
> > Second, call_usermodehelper's path should first increment the counter, and only
> > then check usermodehelper_disabled,
>
> It does this already.
Ah, sorry, I looked at this patch without seeing the underlying code.
BTW, isn't it better to rename new_helper/helper_finished to
helper_lock/helper_unlock ?
> If I understand that correctly, it should suffice to place smp_mb() after
> usermodehelper_disabled = 1; in usermodehelper_pm_callback() and another
> smp_mb() after atomic_inc(&running_helpers); in new_helper().
>
> Is that correct?
Afaics, yes.
Oleg.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists