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rcu: Integrate rcu_dereference_check() message into lockdep

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Make rcu_dereference_check() print the list of held locks in
addition to the stack dump to ease debugging.

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: <1266887105-1528-3-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul E. McKenney
2010-02-22 17:04:47 -08:00
committed by Ingo Molnar
parent c26d34a585
commit 0632eb3d75
3 changed files with 24 additions and 2 deletions
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18
kernel/lockdep.c
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@@ -3809,3 +3809,21 @@ void lockdep_sys_exit(void)
lockdep_print_held_locks(curr);
}
}
void lockdep_rcu_dereference(const char *file, const int line)
{
struct task_struct *curr = current;
if (!debug_locks_off())
return;
printk("\n==============================================\n");
printk( "[ BUG: Unsafe rcu_dereference_check() usage! ]\n");
printk( "----------------------------------------------\n");
printk("%s:%d invoked rcu_dereference_check() without protection!\n",
file, line);
printk("\nother info that might help us debug this:\n\n");
lockdep_print_held_locks(curr);
printk("\nstack backtrace:\n");
dump_stack();
}
EXPORT_SYMBOL_GPL(lockdep_rcu_dereference);