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

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Date:	Thu, 9 Apr 2015 12:21:43 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Peter Zijlstra <peterz@...radead.org>, <mingo@...nel.org>,
	<rusty@...tcorp.com.au>, <mathieu.desnoyers@...icios.com>,
	<oleg@...hat.com>, <paulmck@...ux.vnet.ibm.com>,
	<torvalds@...ux-foundation.org>
CC:	<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 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)

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