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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-03-03 16:46:59 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-03-04 12:07:32 +0100 |
| commit | cc5b83a9f884fe8722a275069a5a6fde39988455 (patch) | |
| tree | 6eec1c17d57a74e98d8b99a568c0c8c2a07a21de | |
| parent | rcu, cgroup: Relax the check in task_subsys_state() as early boot is now hand... (diff) | |
| download | linux-cc5b83a9f884fe8722a275069a5a6fde39988455.tar.xz linux-cc5b83a9f884fe8722a275069a5a6fde39988455.zip | |
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>
| -rw-r--r-- | kernel/lockdep.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c index 0c30d0455de1..681bc2e1e187 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(); |