Merge remote-tracking branch 'master' into queue

Merge reason: development work has dependency on kvm patches merged
upstream.

Conflicts:
	arch/powerpc/include/asm/Kbuild
	arch/powerpc/include/asm/kvm_para.h

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 95 insertions, 113 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 2fdd96f9e998..a0d698467f70 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -210,11 +210,7 @@ static void sysfs_slab_remove(struct kmem_cache *);
 static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
 static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p)
 							{ return 0; }
-static inline void sysfs_slab_remove(struct kmem_cache *s)
-{
-	kfree(s->name);
-	kfree(s);
-}
+static inline void sysfs_slab_remove(struct kmem_cache *s) { }
 
 #endif
 
@@ -568,6 +564,8 @@ static void slab_bug(struct kmem_cache *s, char *fmt, ...)
 	printk(KERN_ERR "BUG %s (%s): %s\n", s->name, print_tainted(), buf);
 	printk(KERN_ERR "----------------------------------------"
 			"-------------------------------------\n\n");
+
+	add_taint(TAINT_BAD_PAGE);
 }
 
 static void slab_fix(struct kmem_cache *s, char *fmt, ...)
@@ -624,7 +622,7 @@ static void object_err(struct kmem_cache *s, struct page *page,
 	print_trailer(s, page, object);
 }
 
-static void slab_err(struct kmem_cache *s, struct page *page, char *fmt, ...)
+static void slab_err(struct kmem_cache *s, struct page *page, const char *fmt, ...)
 {
 	va_list args;
 	char buf[100];
@@ -1069,13 +1067,13 @@ bad:
 	return 0;
 }
 
-static noinline int free_debug_processing(struct kmem_cache *s,
-		 struct page *page, void *object, unsigned long addr)
+static noinline struct kmem_cache_node *free_debug_processing(
+	struct kmem_cache *s, struct page *page, void *object,
+	unsigned long addr, unsigned long *flags)
 {
-	unsigned long flags;
-	int rc = 0;
+	struct kmem_cache_node *n = get_node(s, page_to_nid(page));
 
-	local_irq_save(flags);
+	spin_lock_irqsave(&n->list_lock, *flags);
 	slab_lock(page);
 
 	if (!check_slab(s, page))
@@ -1113,15 +1111,19 @@ static noinline int free_debug_processing(struct kmem_cache *s,
 		set_track(s, object, TRACK_FREE, addr);
 	trace(s, page, object, 0);
 	init_object(s, object, SLUB_RED_INACTIVE);
-	rc = 1;
 out:
 	slab_unlock(page);
-	local_irq_restore(flags);
-	return rc;
+	/*
+	 * Keep node_lock to preserve integrity
+	 * until the object is actually freed
+	 */
+	return n;
 
 fail:
+	slab_unlock(page);
+	spin_unlock_irqrestore(&n->list_lock, *flags);
 	slab_fix(s, "Object at 0x%p not freed", object);
-	goto out;
+	return NULL;
 }
 
 static int __init setup_slub_debug(char *str)
@@ -1214,8 +1216,9 @@ static inline void setup_object_debug(struct kmem_cache *s,
 static inline int alloc_debug_processing(struct kmem_cache *s,
 	struct page *page, void *object, unsigned long addr) { return 0; }
 
-static inline int free_debug_processing(struct kmem_cache *s,
-	struct page *page, void *object, unsigned long addr) { return 0; }
+static inline struct kmem_cache_node *free_debug_processing(
+	struct kmem_cache *s, struct page *page, void *object,
+	unsigned long addr, unsigned long *flags) { return NULL; }
 
 static inline int slab_pad_check(struct kmem_cache *s, struct page *page)
 			{ return 1; }
@@ -1714,7 +1717,7 @@ static inline void note_cmpxchg_failure(const char *n,
 	stat(s, CMPXCHG_DOUBLE_CPU_FAIL);
 }
 
-void init_kmem_cache_cpus(struct kmem_cache *s)
+static void init_kmem_cache_cpus(struct kmem_cache *s)
 {
 	int cpu;
 
@@ -1939,7 +1942,7 @@ static void unfreeze_partials(struct kmem_cache *s)
  * If we did not find a slot then simply move all the partials to the
  * per node partial list.
  */
-int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
+static int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
 {
 	struct page *oldpage;
 	int pages;
@@ -1962,6 +1965,7 @@ int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
 				local_irq_save(flags);
 				unfreeze_partials(s);
 				local_irq_restore(flags);
+				oldpage = NULL;
 				pobjects = 0;
 				pages = 0;
 				stat(s, CPU_PARTIAL_DRAIN);
@@ -2310,7 +2314,7 @@ new_slab:
  *
  * Otherwise we can simply pick the next object from the lockless free list.
  */
-static __always_inline void *slab_alloc(struct kmem_cache *s,
+static __always_inline void *slab_alloc_node(struct kmem_cache *s,
 		gfp_t gfpflags, int node, unsigned long addr)
 {
 	void **object;
@@ -2380,9 +2384,15 @@ redo:
 	return object;
 }
 
+static __always_inline void *slab_alloc(struct kmem_cache *s,
+		gfp_t gfpflags, unsigned long addr)
+{
+	return slab_alloc_node(s, gfpflags, NUMA_NO_NODE, addr);
+}
+
 void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
 {
-	void *ret = slab_alloc(s, gfpflags, NUMA_NO_NODE, _RET_IP_);
+	void *ret = slab_alloc(s, gfpflags, _RET_IP_);
 
 	trace_kmem_cache_alloc(_RET_IP_, ret, s->object_size, s->size, gfpflags);
 
@@ -2393,7 +2403,7 @@ EXPORT_SYMBOL(kmem_cache_alloc);
 #ifdef CONFIG_TRACING
 void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
 {
-	void *ret = slab_alloc(s, gfpflags, NUMA_NO_NODE, _RET_IP_);
+	void *ret = slab_alloc(s, gfpflags, _RET_IP_);
 	trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags);
 	return ret;
 }
@@ -2411,7 +2421,7 @@ EXPORT_SYMBOL(kmalloc_order_trace);
 #ifdef CONFIG_NUMA
 void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
 {
-	void *ret = slab_alloc(s, gfpflags, node, _RET_IP_);
+	void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_);
 
 	trace_kmem_cache_alloc_node(_RET_IP_, ret,
 				    s->object_size, s->size, gfpflags, node);
@@ -2425,7 +2435,7 @@ void *kmem_cache_alloc_node_trace(struct kmem_cache *s,
 				    gfp_t gfpflags,
 				    int node, size_t size)
 {
-	void *ret = slab_alloc(s, gfpflags, node, _RET_IP_);
+	void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_);
 
 	trace_kmalloc_node(_RET_IP_, ret,
 			   size, s->size, gfpflags, node);
@@ -2457,7 +2467,8 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
 
 	stat(s, FREE_SLOWPATH);
 
-	if (kmem_cache_debug(s) && !free_debug_processing(s, page, x, addr))
+	if (kmem_cache_debug(s) &&
+		!(n = free_debug_processing(s, page, x, addr, &flags)))
 		return;
 
 	do {
@@ -2612,6 +2623,13 @@ void kmem_cache_free(struct kmem_cache *s, void *x)
 
 	page = virt_to_head_page(x);
 
+	if (kmem_cache_debug(s) && page->slab != s) {
+		pr_err("kmem_cache_free: Wrong slab cache. %s but object"
+			" is from  %s\n", page->slab->name, s->name);
+		WARN_ON_ONCE(1);
+		return;
+	}
+
 	slab_free(s, page, x, _RET_IP_);
 
 	trace_kmem_cache_free(_RET_IP_, x);
@@ -3026,17 +3044,9 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
 
 }
 
-static int kmem_cache_open(struct kmem_cache *s,
-		const char *name, size_t size,
-		size_t align, unsigned long flags,
-		void (*ctor)(void *))
+static int kmem_cache_open(struct kmem_cache *s, unsigned long flags)
 {
-	memset(s, 0, kmem_size);
-	s->name = name;
-	s->ctor = ctor;
-	s->object_size = size;
-	s->align = align;
-	s->flags = kmem_cache_flags(size, flags, name, ctor);
+	s->flags = kmem_cache_flags(s->size, flags, s->name, s->ctor);
 	s->reserved = 0;
 
 	if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU))
@@ -3098,7 +3108,6 @@ static int kmem_cache_open(struct kmem_cache *s,
 	else
 		s->cpu_partial = 30;
 
-	s->refcount = 1;
 #ifdef CONFIG_NUMA
 	s->remote_node_defrag_ratio = 1000;
 #endif
@@ -3106,16 +3115,16 @@ static int kmem_cache_open(struct kmem_cache *s,
 		goto error;
 
 	if (alloc_kmem_cache_cpus(s))
-		return 1;
+		return 0;
 
 	free_kmem_cache_nodes(s);
 error:
 	if (flags & SLAB_PANIC)
 		panic("Cannot create slab %s size=%lu realsize=%u "
 			"order=%u offset=%u flags=%lx\n",
-			s->name, (unsigned long)size, s->size, oo_order(s->oo),
+			s->name, (unsigned long)s->size, s->size, oo_order(s->oo),
 			s->offset, flags);
-	return 0;
+	return -EINVAL;
 }
 
 /*
@@ -3137,7 +3146,7 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page,
 				     sizeof(long), GFP_ATOMIC);
 	if (!map)
 		return;
-	slab_err(s, page, "%s", text);
+	slab_err(s, page, text, s->name);
 	slab_lock(page);
 
 	get_map(s, page, map);
@@ -3169,7 +3178,7 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
 			discard_slab(s, page);
 		} else {
 			list_slab_objects(s, page,
-				"Objects remaining on kmem_cache_close()");
+			"Objects remaining in %s on kmem_cache_close()");
 		}
 	}
 }
@@ -3182,7 +3191,6 @@ static inline int kmem_cache_close(struct kmem_cache *s)
 	int node;
 
 	flush_all(s);
-	free_percpu(s->cpu_slab);
 	/* Attempt to free all objects */
 	for_each_node_state(node, N_NORMAL_MEMORY) {
 		struct kmem_cache_node *n = get_node(s, node);
@@ -3191,33 +3199,20 @@ static inline int kmem_cache_close(struct kmem_cache *s)
 		if (n->nr_partial || slabs_node(s, node))
 			return 1;
 	}
+	free_percpu(s->cpu_slab);
 	free_kmem_cache_nodes(s);
 	return 0;
 }
 
-/*
- * Close a cache and release the kmem_cache structure
- * (must be used for caches created using kmem_cache_create)
- */
-void kmem_cache_destroy(struct kmem_cache *s)
+int __kmem_cache_shutdown(struct kmem_cache *s)
 {
-	mutex_lock(&slab_mutex);
-	s->refcount--;
-	if (!s->refcount) {
-		list_del(&s->list);
-		mutex_unlock(&slab_mutex);
-		if (kmem_cache_close(s)) {
-			printk(KERN_ERR "SLUB %s: %s called for cache that "
-				"still has objects.\n", s->name, __func__);
-			dump_stack();
-		}
-		if (s->flags & SLAB_DESTROY_BY_RCU)
-			rcu_barrier();
+	int rc = kmem_cache_close(s);
+
+	if (!rc)
 		sysfs_slab_remove(s);
-	} else
-		mutex_unlock(&slab_mutex);
+
+	return rc;
 }
-EXPORT_SYMBOL(kmem_cache_destroy);
 
 /********************************************************************
  *		Kmalloc subsystem
@@ -3226,8 +3221,6 @@ EXPORT_SYMBOL(kmem_cache_destroy);
 struct kmem_cache *kmalloc_caches[SLUB_PAGE_SHIFT];
 EXPORT_SYMBOL(kmalloc_caches);
 
-static struct kmem_cache *kmem_cache;
-
 #ifdef CONFIG_ZONE_DMA
 static struct kmem_cache *kmalloc_dma_caches[SLUB_PAGE_SHIFT];
 #endif
@@ -3273,14 +3266,17 @@ static struct kmem_cache *__init create_kmalloc_cache(const char *name,
 {
 	struct kmem_cache *s;
 
-	s = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
+	s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+
+	s->name = name;
+	s->size = s->object_size = size;
+	s->align = ARCH_KMALLOC_MINALIGN;
 
 	/*
 	 * This function is called with IRQs disabled during early-boot on
 	 * single CPU so there's no need to take slab_mutex here.
 	 */
-	if (!kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN,
-								flags, NULL))
+	if (kmem_cache_open(s, flags))
 		goto panic;
 
 	list_add(&s->list, &slab_caches);
@@ -3362,7 +3358,7 @@ void *__kmalloc(size_t size, gfp_t flags)
 	if (unlikely(ZERO_OR_NULL_PTR(s)))
 		return s;
 
-	ret = slab_alloc(s, flags, NUMA_NO_NODE, _RET_IP_);
+	ret = slab_alloc(s, flags, _RET_IP_);
 
 	trace_kmalloc(_RET_IP_, ret, size, s->size, flags);
 
@@ -3405,7 +3401,7 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node)
 	if (unlikely(ZERO_OR_NULL_PTR(s)))
 		return s;
 
-	ret = slab_alloc(s, flags, node, _RET_IP_);
+	ret = slab_alloc_node(s, flags, node, _RET_IP_);
 
 	trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node);
 
@@ -3482,7 +3478,7 @@ void kfree(const void *x)
 	if (unlikely(!PageSlab(page))) {
 		BUG_ON(!PageCompound(page));
 		kmemleak_free(x);
-		put_page(page);
+		__free_pages(page, compound_order(page));
 		return;
 	}
 	slab_free(page->slab, page, object, _RET_IP_);
@@ -3719,12 +3715,12 @@ void __init kmem_cache_init(void)
 		slub_max_order = 0;
 
 	kmem_size = offsetof(struct kmem_cache, node) +
-				nr_node_ids * sizeof(struct kmem_cache_node *);
+			nr_node_ids * sizeof(struct kmem_cache_node *);
 
 	/* Allocate two kmem_caches from the page allocator */
 	kmalloc_size = ALIGN(kmem_size, cache_line_size());
 	order = get_order(2 * kmalloc_size);
-	kmem_cache = (void *)__get_free_pages(GFP_NOWAIT, order);
+	kmem_cache = (void *)__get_free_pages(GFP_NOWAIT | __GFP_ZERO, order);
 
 	/*
 	 * Must first have the slab cache available for the allocations of the
@@ -3733,9 +3729,10 @@ void __init kmem_cache_init(void)
 	 */
 	kmem_cache_node = (void *)kmem_cache + kmalloc_size;
 
-	kmem_cache_open(kmem_cache_node, "kmem_cache_node",
-		sizeof(struct kmem_cache_node),
-		0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
+	kmem_cache_node->name = "kmem_cache_node";
+	kmem_cache_node->size = kmem_cache_node->object_size =
+		sizeof(struct kmem_cache_node);
+	kmem_cache_open(kmem_cache_node, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
 
 	hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI);
 
@@ -3743,8 +3740,10 @@ void __init kmem_cache_init(void)
 	slab_state = PARTIAL;
 
 	temp_kmem_cache = kmem_cache;
-	kmem_cache_open(kmem_cache, "kmem_cache", kmem_size,
-		0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
+	kmem_cache->name = "kmem_cache";
+	kmem_cache->size = kmem_cache->object_size = kmem_size;
+	kmem_cache_open(kmem_cache, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
+
 	kmem_cache = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
 	memcpy(kmem_cache, temp_kmem_cache, kmem_size);
 
@@ -3933,11 +3932,10 @@ static struct kmem_cache *find_mergeable(size_t size,
 	return NULL;
 }
 
-struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
+struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
 		size_t align, unsigned long flags, void (*ctor)(void *))
 {
 	struct kmem_cache *s;
-	char *n;
 
 	s = find_mergeable(size, align, flags, name, ctor);
 	if (s) {
@@ -3951,36 +3949,29 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 
 		if (sysfs_slab_alias(s, name)) {
 			s->refcount--;
-			return NULL;
+			s = NULL;
 		}
-		return s;
 	}
 
-	n = kstrdup(name, GFP_KERNEL);
-	if (!n)
-		return NULL;
+	return s;
+}
 
-	s = kmalloc(kmem_size, GFP_KERNEL);
-	if (s) {
-		if (kmem_cache_open(s, n,
-				size, align, flags, ctor)) {
-			int r;
+int __kmem_cache_create(struct kmem_cache *s, unsigned long flags)
+{
+	int err;
 
-			list_add(&s->list, &slab_caches);
-			mutex_unlock(&slab_mutex);
-			r = sysfs_slab_add(s);
-			mutex_lock(&slab_mutex);
+	err = kmem_cache_open(s, flags);
+	if (err)
+		return err;
 
-			if (!r)
-				return s;
+	mutex_unlock(&slab_mutex);
+	err = sysfs_slab_add(s);
+	mutex_lock(&slab_mutex);
 
-			list_del(&s->list);
-			kmem_cache_close(s);
-		}
-		kfree(s);
-	}
-	kfree(n);
-	return NULL;
+	if (err)
+		kmem_cache_close(s);
+
+	return err;
 }
 
 #ifdef CONFIG_SMP
@@ -4033,7 +4024,7 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller)
 	if (unlikely(ZERO_OR_NULL_PTR(s)))
 		return s;
 
-	ret = slab_alloc(s, gfpflags, NUMA_NO_NODE, caller);
+	ret = slab_alloc(s, gfpflags, caller);
 
 	/* Honor the call site pointer we received. */
 	trace_kmalloc(caller, ret, size, s->size, gfpflags);
@@ -4063,7 +4054,7 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
 	if (unlikely(ZERO_OR_NULL_PTR(s)))
 		return s;
 
-	ret = slab_alloc(s, gfpflags, node, caller);
+	ret = slab_alloc_node(s, gfpflags, node, caller);
 
 	/* Honor the call site pointer we received. */
 	trace_kmalloc_node(caller, ret, size, s->size, gfpflags, node);
@@ -5210,14 +5201,6 @@ static ssize_t slab_attr_store(struct kobject *kobj,
 	return err;
 }
 
-static void kmem_cache_release(struct kobject *kobj)
-{
-	struct kmem_cache *s = to_slab(kobj);
-
-	kfree(s->name);
-	kfree(s);
-}
-
 static const struct sysfs_ops slab_sysfs_ops = {
 	.show = slab_attr_show,
 	.store = slab_attr_store,
@@ -5225,7 +5208,6 @@ static const struct sysfs_ops slab_sysfs_ops = {
 
 static struct kobj_type slab_ktype = {
 	.sysfs_ops = &slab_sysfs_ops,
-	.release = kmem_cache_release
 };
 
 static int uevent_filter(struct kset *kset, struct kobject *kobj)