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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 <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Paul E. McKenney 2010-02-22 17:04:47 -08:00 • committed by Ingo Molnar
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);