linux-kernel - Re: [PATCH 10/16] ptrace: clean transitions between TASK

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Message-ID: <20101221173258.GF13285@htj.dyndns.org>
Date:	Tue, 21 Dec 2010 18:32:59 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	roland@...hat.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	rjw@...k.pl, jan.kratochvil@...hat.com
Subject: Re: [PATCH 10/16] ptrace: clean transitions between TASK_STOPPED
 and TRACED

On Tue, Dec 21, 2010 at 06:31:55PM +0100, Tejun Heo wrote:
> > > @@ -1842,7 +1879,18 @@ static int do_signal_stop(int signr)
> > >
> > >  		spin_lock_irq(&current->sighand->siglock);
> > >  	} else
> > > -		ptrace_stop(current->exit_code, CLD_STOPPED, 0, NULL);
> > > +		ptrace_stop(current->group_stop & GROUP_STOP_SIGMASK,
> > > +			    CLD_STOPPED, 0, NULL);
> > 
> > Perhaps it would be more clean to clear ->exit_code here, in the
> > "else" branch.
> 
> Hmmm... and dropping current->exit_code clearing from the
> do_signal_stop(), right?  I'm a bit confused about the use of
> current->exit_code tho.  Why aren't we clearing it from ptrace_stop()?

Ah, never mind.  It's used as the signr return from ptrace signal
trap.

Thanks.

-- 
tejun
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