locking, tracing: Annotate tracing locks as raw

The tracing locks can be taken in atomic context and therefore
cannot be preempted on -rt - annotate it.

In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.

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

1 files changed, 5 insertions, 5 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index e5df02c69b1..0c8bdeeb358 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -341,7 +341,7 @@ unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
         TRACE_ITER_GRAPH_TIME | TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE;
 
 static int trace_stop_count;
-static DEFINE_SPINLOCK(tracing_start_lock);
+static DEFINE_RAW_SPINLOCK(tracing_start_lock);
 
 static void wakeup_work_handler(struct work_struct *work)
 {
@@ -960,7 +960,7 @@ void tracing_start(void)
         if (tracing_disabled)
                 return;
 
-        spin_lock_irqsave(&tracing_start_lock, flags);
+        raw_spin_lock_irqsave(&tracing_start_lock, flags);
         if (--trace_stop_count) {
                 if (trace_stop_count < 0) {
                         /* Someone screwed up their debugging */
@@ -985,7 +985,7 @@ void tracing_start(void)
 
         ftrace_start();
  out:
-        spin_unlock_irqrestore(&tracing_start_lock, flags);
+        raw_spin_unlock_irqrestore(&tracing_start_lock, flags);
 }
 
 /**
@@ -1000,7 +1000,7 @@ void tracing_stop(void)
         unsigned long flags;
 
         ftrace_stop();
-        spin_lock_irqsave(&tracing_start_lock, flags);
+        raw_spin_lock_irqsave(&tracing_start_lock, flags);
         if (trace_stop_count++)
                 goto out;
 
@@ -1018,7 +1018,7 @@ void tracing_stop(void)
         arch_spin_unlock(&ftrace_max_lock);
 
  out:
-        spin_unlock_irqrestore(&tracing_start_lock, flags);
+        raw_spin_unlock_irqrestore(&tracing_start_lock, flags);
 }
 
 void trace_stop_cmdline_recording(void);