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>
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@ -3822,6 +3822,7 @@ void lockdep_rcu_dereference(const char *file, const int line)
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printk("%s:%d invoked rcu_dereference_check() without protection!\n",
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file, line);
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printk("\nother info that might help us debug this:\n\n");
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printk("\nrcu_scheduler_active = %d, debug_locks = %d\n", rcu_scheduler_active, debug_locks);
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lockdep_print_held_locks(curr);
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printk("\nstack backtrace:\n");
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dump_stack();
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