linux-kernel - [tip:core/urgent] rcu: Add control variables to lockdep_rcu

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Message-ID: <tip-cc5b83a9f884fe8722a275069a5a6fde39988455@git.kernel.org>
Date:	Thu, 4 Mar 2010 16:32:19 GMT
From:	"tip-bot for Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:core/urgent] rcu: Add control variables to lockdep_rcu_dereference() diagnostics

Commit-ID:  cc5b83a9f884fe8722a275069a5a6fde39988455
Gitweb:     http://git.kernel.org/tip/cc5b83a9f884fe8722a275069a5a6fde39988455
Author:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Wed, 3 Mar 2010 07:46:59 -0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 4 Mar 2010 12:07:32 +0100

rcu: Add control variables to lockdep_rcu_dereference() diagnostics

Add the values of rcu_scheduler_active() and debug_locks() to
the lockdep_rcu_dereference() output to help diagnose RCU
lockdep splats that occur shortly after the scheduler starts.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: laijs@...fujitsu.com
Cc: dipankar@...ibm.com
Cc: mathieu.desnoyers@...ymtl.ca
Cc: josh@...htriplett.org
Cc: dvhltc@...ibm.com
Cc: niv@...ibm.com
Cc: peterz@...radead.org
Cc: rostedt@...dmis.org
Cc: Valdis.Kletnieks@...edu
Cc: dhowells@...hat.com
LKML-Reference: <1267631219-8713-4-git-send-email-paulmck@...ux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/lockdep.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 0c30d04..681bc2e 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -3822,6 +3822,7 @@ void lockdep_rcu_dereference(const char *file, const int line)
 	printk("%s:%d invoked rcu_dereference_check() without protection!\n",
 			file, line);
 	printk("\nother info that might help us debug this:\n\n");
+	printk("\nrcu_scheduler_active = %d, debug_locks = %d\n", rcu_scheduler_active, debug_locks);
 	lockdep_print_held_locks(curr);
 	printk("\nstack backtrace:\n");
 	dump_stack();
--
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