ftrace: user raw_spin_lock in tracing

Lock debugging enabled cause huge performance problems for tracing. Having
the lock verification happening for every function that is called
because mcount calls spin_lock can cripple the system.

This patch converts the spin_locks used by ftrace into raw_spin_locks.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 98cbfd05d754..25cba28eb9ba 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -76,7 +76,7 @@ struct trace_entry {
 struct trace_array_cpu {
         struct list_head        trace_pages;
         atomic_t                disabled;
-        spinlock_t              lock;
+        raw_spinlock_t          lock;
         struct lock_class_key   lock_key;
 
         /* these fields get copied into max-trace: */