[PATCH 12/14] mm/mmap_lock: Remove dead code for !CONFIG_TRACING configurations

[Mel Gorman]

make W=1 generates the following warning in mmap_lock.c for allnoconfig

  mm/mmap_lock.c:213:6: warning: no previous prototype for ‘__mmap_lock_do_trace_start_locking’ [-Wmissing-prototypes]
   void __mmap_lock_do_trace_start_locking(struct mm_struct *mm, bool write)
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  mm/mmap_lock.c:219:6: warning: no previous prototype for ‘__mmap_lock_do_trace_acquire_returned’ [-Wmissing-prototypes]
   void __mmap_lock_do_trace_acquire_returned(struct mm_struct *mm, bool write,
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  mm/mmap_lock.c:226:6: warning: no previous prototype for ‘__mmap_lock_do_trace_released’ [-Wmissing-prototypes]
   void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write)

On !CONFIG_TRACING configurations, the code is dead so put it behind
an #ifdef.

Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
---
 mm/mmap_lock.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/mmap_lock.c b/mm/mmap_lock.c
index dcdde4f722a4..03ee85c696ef 100644
--- a/mm/mmap_lock.c
+++ b/mm/mmap_lock.c
@@ -205,6 +205,7 @@ void trace_mmap_lock_unreg(void)
 
 #endif /* CONFIG_MEMCG */
 
+#ifdef CONFIG_TRACING
 /*
  * Trace calls must be in a separate file, as otherwise there's a circular
  * dependency between linux/mmap_lock.h and trace/events/mmap_lock.h.
@@ -228,3 +229,4 @@ void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write)
 	TRACE_MMAP_LOCK_EVENT(released, mm, write);
 }
 EXPORT_SYMBOL(__mmap_lock_do_trace_released);
+#endif /* CONFIG_TRACING */
-- 
2.26.2