diff --git a/include/asm-alpha/compiler.h b/include/asm-alpha/compiler.h
index 399c33b7be5112732a4f1f31d2d401a696df511e..0a4a8b40dfcd7a623e6ad0f95c3c3d4a7e969a76 100644
--- a/include/asm-alpha/compiler.h
+++ b/include/asm-alpha/compiler.h
@@ -98,6 +98,9 @@
 #undef inline
 #undef __inline__
 #undef __inline
-
+#if __GNUC__ == 3 && __GNUC_MINOR__ >= 1 || __GNUC__ > 3
+#undef __always_inline
+#define __always_inline		inline __attribute__((always_inline))
+#endif
 
 #endif /* __ALPHA_COMPILER_H */
diff --git a/mm/slab.c b/mm/slab.c
index 437d3388054bbe93bd2567eb8257f6365a1c5c78..cf19ff2ab5e2bca587a645c241b24b65a7531901 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -308,12 +308,12 @@ struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS];
 #define	SIZE_L3 (1 + MAX_NUMNODES)
 
 /*
- * This function may be completely optimized away if
+ * This function must be completely optimized away if
  * a constant is passed to it. Mostly the same as
  * what is in linux/slab.h except it returns an
  * index.
  */
-static inline int index_of(const size_t size)
+static __always_inline int index_of(const size_t size)
 {
 	if (__builtin_constant_p(size)) {
 		int i = 0;
@@ -329,7 +329,8 @@ static inline int index_of(const size_t size)
 			extern void __bad_size(void);
 			__bad_size();
 		}
-	}
+	} else
+		BUG();
 	return 0;
 }