ftrace: fix locking

we can hold all cpu trace buffer locks at once - put each into a
separate lock class.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 29a7ea59de50..b0408356f0e0 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -56,6 +56,7 @@ struct trace_array_cpu {
         struct list_head        trace_pages;
         atomic_t                disabled;
         spinlock_t              lock;
+        struct lock_class_key   lock_key;
         cycle_t                 time_offset;
 
         /* these fields get copied into max-trace: */