linux-kernel - Re: [RFC][PATCH 4/5] signal: Add signal->ctrl

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Date:	Fri, 30 Sep 2011 17:30:27 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Anirudh Badam <abadam@...princeton.edu>
Subject: Re: [RFC][PATCH 4/5] signal: Add signal->ctrl_lock for job control

On Fri, 2011-09-30 at 16:12 +0100, Matt Fleming wrote:
> +       assert_spin_locked(&t->sighand->siglock);
> +       assert_spin_locked(&t->signal->ctrl_lock);

There's also lockdep_assert_held(), the difference is that
assert_spin_locked() will always generate code, and only checks that the
lock is held, not that we are the current owner.

lockdep_assert_held() will only generate code for lockdep kernels and
will in fact check that the specified lock is held by the current task.
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