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Date: Wed, 16 Dec 2009 19:57:32 +0100
From: Frederic Weisbecker <fweisbec@gmail.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, linux-tip-commits@vger.kernel.org,
       linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com,
       peterz@infradead.org, tglx@linutronix.de
Subject: Re: [tip:sched/urgent] sched: Teach might_sleep() about
	preemptible RCU
Message-ID: <20091216185723.GA5211@nowhere>
References: <1260830672-7166-1-git-send-regression-fweisbec@gmail.com> <tip-ba1b1cbcc9b458c4b9ebb28c9cf6a2ccf64ba1cd@git.kernel.org> <20091216142536.GA18091@elte.hu> <20091216153020.GD6744@linux.vnet.ibm.com>
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On Wed, Dec 16, 2009 at 07:30:20AM -0800, Paul E. McKenney wrote:
> On Wed, Dec 16, 2009 at 03:25:36PM +0100, Ingo Molnar wrote:
> > 
> > * tip-bot for Frederic Weisbecker <fweisbec@gmail.com> wrote:
> > 
> > > Commit-ID:  ba1b1cbcc9b458c4b9ebb28c9cf6a2ccf64ba1cd
> > > Gitweb:     http://git.kernel.org/tip/ba1b1cbcc9b458c4b9ebb28c9cf6a2ccf64ba1cd
> > > Author:     Frederic Weisbecker <fweisbec@gmail.com>
> > > AuthorDate: Mon, 14 Dec 2009 23:44:32 +0100
> > > Committer:  Ingo Molnar <mingo@elte.hu>
> > > CommitDate: Wed, 16 Dec 2009 08:43:16 +0100
> > > 
> > > sched: Teach might_sleep() about preemptible RCU
> > 
> > Causes a build failure, so skipped this patch for now:
> > 
> > kernel/sched.c:9661: error: implicit declaration of function 'rcu_preempt_depth'
> 
> I guess my testing missed something.  :-/  Could you please send the
> .config file that caused this?
> 
> 							Thanx, Paul


Looks like the problem is here:

rcupdate.h:

	#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
	#include <linux/rcutree.h>
	#elif defined(CONFIG_TINY_RCU)
	#include <linux/rcutiny.h>

I guess it barfs in rcutiny configs.

I should define these helpers in rcupdate.