---

yaml
---
r: 215943
b: refs/heads/master
c: db210e7
h: refs/heads/master
i:
  215941: 1511f74
  215939: b819eb4
  215935: 497a1c2
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a016471a16b5c4d4ec8f5221575e603a3d11e5e9
+refs/heads/master: db210e70e5f191710a3b1d09f653b44885d397ea

trunk/mm/slub.c

@@ -2103,8 +2103,24 @@ init_kmem_cache_node(struct kmem_cache_node *n, struct kmem_cache *s)
 
 static inline int alloc_kmem_cache_cpus(struct kmem_cache *s)
 {
+#ifdef CONFIG_SMP
+	/*
+	 * Will use reserve that does not require slab operation during
+	 * early boot.
+	 */
 	BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE <
 			SLUB_PAGE_SHIFT * sizeof(struct kmem_cache_cpu));
+#else
+	/*
+	 * Special hack for UP mode. allocpercpu() falls back to kmalloc
+	 * operations. So we cannot use that before the slab allocator is up
+	 * Simply get the smallest possible compound page. The page will be
+	 * released via kfree() when the cpu caches are resized later.
+	 */
+	if (slab_state < UP)
+		s->cpu_slab = (__percpu void *)kmalloc_large(PAGE_SIZE << 1, GFP_NOWAIT);
+	else
+#endif
 
 	s->cpu_slab = alloc_percpu(struct kmem_cache_cpu);