linux-kernel - [PATCH 1/8] rcu: add a warn to rcu_preempt_note_context

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Date:	Wed, 7 Aug 2013 18:24:57 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	Dipankar Sarma <dipankar@...ibm.com>
Subject: [PATCH 1/8] rcu: add a warn to rcu_preempt_note_context_switch()

It is expected that _nesting == INT_MIN if _nesting < 0.
Add a warning to it if something unexpected happen.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 kernel/rcutree_plugin.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 63098a5..8fd947e 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -243,6 +243,7 @@ static void rcu_preempt_note_context_switch(int cpu)
 				       : rnp->gpnum + 1);
 		raw_spin_unlock_irqrestore(&rnp->lock, flags);
 	} else if (t->rcu_read_lock_nesting < 0 &&
+		   !WARN_ON_ONCE(t->rcu_read_lock_nesting != INT_MIN) &&
 		   t->rcu_read_unlock_special) {
 
 		/*
-- 
1.7.4.4

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