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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-03-03 07:46:59 -0800
committerIngo Molnar <mingo@elte.hu>2010-03-04 12:07:32 +0100
commitcc5b83a9f884fe8722a275069a5a6fde39988455 (patch)
tree6eec1c17d57a74e98d8b99a568c0c8c2a07a21de /kernel/lockdep.c
parent5ed42b8113667c06a6ff2c72717395b5044d30a1 (diff)
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@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: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/lockdep.c')
-rw-r--r--kernel/lockdep.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 0c30d0455de..681bc2e1e18 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();