Re: [RFC][PATCH 4/5] signal: Add signal->ctrl_lock for job control

[Peter Zijlstra]

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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