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Commit cc5b83a9 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Ingo Molnar
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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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1267631219-8713-4-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 5ed42b81

kernel/lockdep.c

+1 −0
Original line number Diff line number Diff line
@@ -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();