diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index 319826e..ad928ed 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -34,7 +34,7 @@
 #include <asm/mmu.h>
 #include <asm/spu.h>
 
-static spinlock_t slice_convert_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(slice_convert_lock);
 
 
 #ifdef DEBUG