linux-kernel - [PATCH 0/1] kthreads: allow_signal: don't play with ->blocked

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Message-ID: <20110816194427.GA6602@redhat.com>
Date:	Tue, 16 Aug 2011 21:44:27 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Fleming <matt@...sole-pimps.org>
Cc:	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH 0/1] kthreads: allow_signal: don't play with ->blocked

On 08/16, Oleg Nesterov wrote:
>
> >  int allow_signal(int sig)
> >  {
> > +	sigset_t blocked;
> > +
> >  	if (!valid_signal(sig) || sig < 1)
> >  		return -EINVAL;
> >
> >  	spin_lock_irq(&current->sighand->siglock);
> >  	/* This is only needed for daemonize()'ed kthreads */
>
> Exactly. And nowadays the daemonize()'ed kthreads should not play
> with allow_signal().
>
> And more, I think it is the time to kill daemonize(). Contrary to
> what /bin/grep thinks, it has only one user.

No, daemonize() has no users which actually need it.

Imho we should deprecate it, it has no users after the patches I sent.

> In short: this code in allow_signal() should die.

Yes.

To clarify: this change breaks drivers/staging/rtl8712/, but I belive
it is wrong and should be fixed. I have already sent the patch.

Oleg.

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