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lockdep: Print lock name in lockdep_init_error()

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This patch prints the name of the lock which is acquired
before lockdep_init() is called, so that users can easily
find which lock triggered the lockdep init error warning.

This patch also removes the lockdep_init_error() message
of "Arch code didn't call lockdep_init() early enough?"
since lockdep_init() is called in arch independent code now.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1321508072-23853-2-git-send-email-tom.leiming@gmail.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ming Lei 2011-11-17 13:34:32 +08:00 committed by Ingo Molnar
parent 73839c5b2e
commit 81140acc66
1 changed files with 4 additions and 1 deletions
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5
kernel/lockdep.c
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@ -431,6 +431,7 @@ unsigned int max_lockdep_depth;
* about it later on, in lockdep_info().
*/
static int lockdep_init_error;
static const char *lock_init_error;
static unsigned long lockdep_init_trace_data[20];
static struct stack_trace lockdep_init_trace = {
.max_entries = ARRAY_SIZE(lockdep_init_trace_data),
@ -657,6 +658,7 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass)
if (unlikely(!lockdep_initialized)) {
lockdep_init();
lockdep_init_error = 1;
lock_init_error = lock->name;
save_stack_trace(&lockdep_init_trace);
}
#endif
@ -3978,7 +3980,8 @@ void __init lockdep_info(void)
#ifdef CONFIG_DEBUG_LOCKDEP
if (lockdep_init_error) {
printk("WARNING: lockdep init error! Arch code didn't call lockdep_init() early enough?\n");
printk("WARNING: lockdep init error! lock-%s was acquired"
"before lockdep_init\n", lock_init_error);
printk("Call stack leading to lockdep invocation was:\n");
print_stack_trace(&lockdep_init_trace, 0);
}