[PATCH 3/3] mm/slub: Put tid_to_cpu() and tid_to_event() inside #ifdef block

[Matthias Kaehlcke <mka@chromium.org>]

The functions are only used when certain config options are set. Putting
them inside #ifdef fixes the following warnings when building with clang:

mm/slub.c:1759:28: error: unused function 'tid_to_cpu'
    [-Werror,-Wunused-function]
                           ^
mm/slub.c:1764:29: error: unused function 'tid_to_event'
    [-Werror,-Wunused-function]

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
---
 mm/slub.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/slub.c b/mm/slub.c
index 23a8eb83efff..6df95738420d 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1945,15 +1945,19 @@ static inline unsigned long next_tid(unsigned long tid)
 	return tid + TID_STEP;
 }
 
+#ifdef SLUB_DEBUG_CMPXCHG
+#ifdef CONFIG_PREEMPT
 static inline unsigned int tid_to_cpu(unsigned long tid)
 {
 	return tid % TID_STEP;
 }
+#endif
 
 static inline unsigned long tid_to_event(unsigned long tid)
 {
 	return tid / TID_STEP;
 }
+#endif
 
 static inline unsigned int init_tid(int cpu)
 {
-- 
2.13.0.303.g4ebf302169-goog

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