linux-kernel - Re: wait_task_zombie plus WNOWAIT question

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Message-ID: <87d48kh4u4.wl%vmayatsk@redhat.com>
Date:	Wed, 01 Jul 2009 16:10:11 +0200
From:	Vitaly Mayatskikh <v.mayatskih@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Vitaly Mayatskikh <v.mayatskih@...il.com>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: wait_task_zombie plus WNOWAIT question

At Wed, 1 Jul 2009 15:55:44 +0200, Oleg Nesterov wrote:
> 
> On 07/01, Vitaly Mayatskikh wrote:
> >
> > I'm working on (sigh) next version of wait_task_* cleanups and stuck
> > in wait_task_zombie. I'm trying to move put_user(stat, wo->wo_stat)
> > code from all wait_task_* functions to common place, but
> > wait_task_zombie does not fill wo_stat if WNOWAIT flag is set
> 
> Only waitid() can use WNOWAIT, and in this case ->wo_stat == NULL.
> 
> > and does
> > it w/o that flag. Is it done so by design, or I can make
> > user-visible change and add put_user in WNOWAIT path?
> 
> Just check do not do put_user(->wo_stat) if it is NULL in do_wait
> pathes.

Got it! Thanks, Oleg!

-- 
wbr, Vitaly
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