[PATCH] mm/slub: fix -Wunused-function compiler warnings

[Qian Cai]

tid_to_cpu() and tid_to_event() are only used in note_cmpxchg_failure()
when SLUB_DEBUG_CMPXCHG=y, so when SLUB_DEBUG_CMPXCHG=n by default,
Clang will complain that those unused functions.

Signed-off-by: Qian Cai <cai@xxxxxx>
---
 mm/slub.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/slub.c b/mm/slub.c
index 8834563cdb4b..49739f005b4f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2004,6 +2004,7 @@ static inline unsigned long next_tid(unsigned long tid)
 	return tid + TID_STEP;
 }
 
+#ifdef SLUB_DEBUG_CMPXCHG
 static inline unsigned int tid_to_cpu(unsigned long tid)
 {
 	return tid % TID_STEP;
@@ -2013,6 +2014,7 @@ static inline unsigned long tid_to_event(unsigned long tid)
 {
 	return tid / TID_STEP;
 }
+#endif
 
 static inline unsigned int init_tid(int cpu)
 {
-- 
1.8.3.1