sched: micro-optimize mmdrop()

micro-optimize mmdrop(). Improves schedule()'s assembly a bit.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 785ec8465bd39a8e12fef5c72f756afae27a33b5..cfb680585ab8bd87762fe3e9b2bedfb404882760 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1514,7 +1514,7 @@ extern struct mm_struct * mm_alloc(void);
 extern void FASTCALL(__mmdrop(struct mm_struct *));
 static inline void mmdrop(struct mm_struct * mm)
 {
-       if (atomic_dec_and_test(&mm->mm_count))
+       if (unlikely(atomic_dec_and_test(&mm->mm_count)))
                __mmdrop(mm);
 }