+/*
+ * Check the page->freelist of a page and either transfer the freelist to the per cpu freelist
+ * or deactivate the page.
+ *
+ * The page is still frozen if the return value is not NULL.
+ *
+ * If this function returns NULL then the page has been unfrozen.
+ */
+static inline void *get_freelist(struct kmem_cache *s, struct page *page)
+{
+ struct page new;
+ unsigned long counters;
+ void *freelist;
+
+ do {
+ freelist = page->freelist;
+ counters = page->counters;
+ new.counters = counters;
+ VM_BUG_ON(!new.frozen);
+
+ new.inuse = page->objects;
+ new.frozen = freelist != NULL;
+
+ } while (!cmpxchg_double_slab(s, page,
+ freelist, counters,
+ NULL, new.counters,
+ "get_freelist"));
+
+ return freelist;
+}
+