mm, slab: Match SLAB and SLUB kmem_cache_alloc_xxx_trace() prototype

This long (seemingly unnecessary) patch does not fix anything and
its only goal is to produce common code between SLAB and SLUB.

Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index 604ebc8..e98caeb 100644
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -111,11 +111,10 @@
 void *__kmalloc(size_t size, gfp_t flags);
 
 #ifdef CONFIG_TRACING
-extern void *kmem_cache_alloc_trace(size_t size,
-				    struct kmem_cache *cachep, gfp_t flags);
+extern void *kmem_cache_alloc_trace(struct kmem_cache *, gfp_t, size_t);
 #else
 static __always_inline void *
-kmem_cache_alloc_trace(size_t size, struct kmem_cache *cachep, gfp_t flags)
+kmem_cache_alloc_trace(struct kmem_cache *cachep, gfp_t flags, size_t size)
 {
 	return kmem_cache_alloc(cachep, flags);
 }
@@ -148,7 +147,7 @@
 #endif
 			cachep = malloc_sizes[i].cs_cachep;
 
-		ret = kmem_cache_alloc_trace(size, cachep, flags);
+		ret = kmem_cache_alloc_trace(cachep, flags, size);
 
 		return ret;
 	}