linux-kernel - Re: [PATCH 11/16] signal: prepare for CLD

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Message-ID: <20101220162347.GB15755@redhat.com>
Date:	Mon, 20 Dec 2010 17:23:47 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
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 11/16] signal: prepare for CLD_* notification changes

On 12/20, Oleg Nesterov wrote:
>
> On 12/06, Tejun Heo wrote:
> >
> > +	 * Determine whether and what to notify.  This should be done under
> > +	 * @tsk's siglock.
>
> Hmm... it is not clear why.
>
> > +	spin_lock_irqsave(&sighand->siglock, flags);
> >
> > +	switch (why) {
> > +	case CLD_CONTINUED:
> > +	case CLD_STOPPED:
> > +	case CLD_TRAPPED:
> > +		notify = why;
> > +		break;
> > +	}
>
> OK, with the next patches this code checks sig->flags, probably that
> is why we take ->siglock. Still I can't understand this so far.
> May be the comment could tell more?

Ah, I didn't notice we are going to change sig->flags here, please
ignore.

Oleg.

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