linux-kernel - Re: [PATCH v2 1/2] sched: Add cond_resched_rcu

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Message-ID: <20130502072742.GF7521@dyad.programming.kicks-ass.net>
Date:	Thu, 2 May 2013 09:27:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Julian Anastasov <ja@....bg>, Simon Horman <horms@...ge.net.au>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Ingo Molnar <mingo@...hat.com>, lvs-devel@...r.kernel.org,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Dipankar Sarma <dipankar@...ibm.com>
Subject: Re: [PATCH v2 1/2] sched: Add cond_resched_rcu_lock() helper

On Wed, May 01, 2013 at 07:32:58AM -0700, Paul E. McKenney wrote:
> Here is how to detect this:
> 
> 	static void inline cond_resched_rcu_lock(void)
> 	{
> 		rcu_read_unlock();
> 		WARN_ON_ONCE(rcu_read_lock_held());
> 	#ifndef CONFIG_PREEMPT_RCU
> 		cond_resched();
> 	#endif
> 		rcu_read_lock();
> 	}

The __might_sleep(__FILE__, __LINE__, PREEMPT_RCU_OFFSET) I posted in the other
email just now should deal with this.
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