1 files changed, 48 insertions, 49 deletions

diff --git a/mm/slab_common.c b/mm/slab_common.c
index aa3ca5b..8cf8b49 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -23,49 +23,17 @@ enum slab_state slab_state;
 LIST_HEAD(slab_caches);
 DEFINE_MUTEX(slab_mutex);
 
-/*
- * kmem_cache_create - Create a cache.
- * @name: A string which is used in /proc/slabinfo to identify this cache.
- * @size: The size of objects to be created in this cache.
- * @align: The required alignment for the objects.
- * @flags: SLAB flags
- * @ctor: A constructor for the objects.
- *
- * Returns a ptr to the cache on success, NULL on failure.
- * Cannot be called within a interrupt, but can be interrupted.
- * The @ctor is run when new pages are allocated by the cache.
- *
- * The flags are
- *
- * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
- * to catch references to uninitialised memory.
- *
- * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check
- * for buffer overruns.
- *
- * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware
- * cacheline.  This can be beneficial if you're counting cycles as closely
- * as davem.
- */
-
-struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align,
-		unsigned long flags, void (*ctor)(void *))
+#ifdef CONFIG_DEBUG_VM
+static int kmem_cache_sanity_check(const char *name, size_t size)
 {
 	struct kmem_cache *s = NULL;
 
-#ifdef CONFIG_DEBUG_VM
 	if (!name || in_interrupt() || size < sizeof(void *) ||
 		size > KMALLOC_MAX_SIZE) {
-		printk(KERN_ERR "kmem_cache_create(%s) integrity check"
-			" failed\n", name);
-		goto out;
+		pr_err("kmem_cache_create(%s) integrity check failed\n", name);
+		return -EINVAL;
 	}
-#endif
 
-	get_online_cpus();
-	mutex_lock(&slab_mutex);
-
-#ifdef CONFIG_DEBUG_VM
 	list_for_each_entry(s, &slab_caches, list) {
 		char tmp;
 		int res;
@@ -77,36 +45,67 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align
 		 */
 		res = probe_kernel_address(s->name, tmp);
 		if (res) {
-			printk(KERN_ERR
-			       "Slab cache with size %d has lost its name\n",
+			pr_err("Slab cache with size %d has lost its name\n",
 			       s->object_size);
 			continue;
 		}
 
 		if (!strcmp(s->name, name)) {
-			printk(KERN_ERR "kmem_cache_create(%s): Cache name"
-				" already exists.\n",
-				name);
+			pr_err("%s (%s): Cache name already exists.\n",
+			       __func__, name);
 			dump_stack();
 			s = NULL;
-			goto oops;
+			return -EINVAL;
 		}
 	}
 
 	WARN_ON(strchr(name, ' '));	/* It confuses parsers */
+	return 0;
+}
+#else
+static inline int kmem_cache_sanity_check(const char *name, size_t size)
+{
+	return 0;
+}
 #endif
 
-	s = __kmem_cache_create(name, size, align, flags, ctor);
+/*
+ * kmem_cache_create - Create a cache.
+ * @name: A string which is used in /proc/slabinfo to identify this cache.
+ * @size: The size of objects to be created in this cache.
+ * @align: The required alignment for the objects.
+ * @flags: SLAB flags
+ * @ctor: A constructor for the objects.
+ *
+ * Returns a ptr to the cache on success, NULL on failure.
+ * Cannot be called within a interrupt, but can be interrupted.
+ * The @ctor is run when new pages are allocated by the cache.
+ *
+ * The flags are
+ *
+ * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
+ * to catch references to uninitialised memory.
+ *
+ * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check
+ * for buffer overruns.
+ *
+ * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware
+ * cacheline.  This can be beneficial if you're counting cycles as closely
+ * as davem.
+ */
+
+struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align,
+		unsigned long flags, void (*ctor)(void *))
+{
+	struct kmem_cache *s = NULL;
 
-#ifdef CONFIG_DEBUG_VM
-oops:
-#endif
+	get_online_cpus();
+	mutex_lock(&slab_mutex);
+	if (kmem_cache_sanity_check(name, size) == 0)
+		s = __kmem_cache_create(name, size, align, flags, ctor);
 	mutex_unlock(&slab_mutex);
 	put_online_cpus();
 
-#ifdef CONFIG_DEBUG_VM
-out:
-#endif
 	if (!s && (flags & SLAB_PANIC))
 		panic("kmem_cache_create: Failed to create slab '%s'\n", name);