slub: pass page to node_match() instead of kmem_cache_cpu structure

Avoid passing the kmem_cache_cpu pointer to node_match. This makes the
node_match function more generic and easier to understand.
Acked-by: NDavid Rientjes <rientjes@google.com>
Signed-off-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NPekka Enberg <penberg@kernel.org>

mm/slub.c

@@ -2050,10 +2050,10 @@ static void flush_all(struct kmem_cache *s)
  * Check if the objects in a per cpu structure fit numa
  * locality expectations.
  */
-static inline int node_match(struct kmem_cache_cpu *c, int node)
+static inline int node_match(struct page *page, int node)
 {
 #ifdef CONFIG_NUMA
-	if (node != NUMA_NO_NODE && page_to_nid(c->page) != node)
+	if (node != NUMA_NO_NODE && page_to_nid(page) != node)
 		return 0;
 #endif
 	return 1;
@@ -2226,7 +2226,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
 		goto new_slab;
 redo:
 
-	if (unlikely(!node_match(c, node))) {
+	if (unlikely(!node_match(page, node))) {
 		stat(s, ALLOC_NODE_MISMATCH);
 		deactivate_slab(s, page, c->freelist);
 		c->page = NULL;
@@ -2313,6 +2313,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
 {
 	void **object;
 	struct kmem_cache_cpu *c;
+	struct page *page;
 	unsigned long tid;
 
 	if (slab_pre_alloc_hook(s, gfpflags))
@@ -2338,7 +2339,8 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
 	barrier();
 
 	object = c->freelist;
-	if (unlikely(!object || !node_match(c, node)))
+	page = c->page;
+	if (unlikely(!object || !node_match(page, node)))
 
 		object = __slab_alloc(s, gfpflags, node, addr, c);