linux-kernel - Re: [PATCH v4 1/9] module: Sanitize RCU usage and locking

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Message-ID: <20150409123652.GV5029@twins.programming.kicks-ass.net>
Date:	Thu, 9 Apr 2015 14:36:52 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	mingo@...nel.org, rusty@...tcorp.com.au,
	mathieu.desnoyers@...icios.com, oleg@...hat.com,
	paulmck@...ux.vnet.ibm.com, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, andi@...stfloor.org,
	rostedt@...dmis.org, tglx@...utronix.de
Subject: Re: [PATCH v4 1/9] module: Sanitize RCU usage and locking

On Thu, Apr 09, 2015 at 12:21:43PM +0800, Lai Jiangshan wrote:
> On 04/09/2015 12:48 AM, Peter Zijlstra wrote:
> 
> > +static void module_assert_mutex_or_preempt(void)
> > +{
> > +#ifdef CONFIG_LOCKDEP
> > +	int rcu_held = rcu_read_lock_sched_held();
> > +	int mutex_held = 1;
> > +
> > +	if (debug_locks)
> > +		mutex_held = lockdep_is_held(&module_mutex);
> > +
> > +	WARN_ON(!rcu_held && !mutex_held);
> > +#endif
> > +}
> 
> Is rcu_lockdep_assert() suitable for it?
> (note rcu_lockdep_assert() only works when CONFIG_PROVE_RCU)

Nah, this works.

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