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Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c145
1 files changed, 56 insertions, 89 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 97a49d9a37cd..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
@@ -626,7 +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];
@@ -2627,6 +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);
@@ -3041,17 +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))
@@ -3113,7 +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
@@ -3121,16 +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;
}
/*
@@ -3152,7 +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);
@@ -3184,7 +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()");
}
}
}
@@ -3197,7 +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);
@@ -3206,33 +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
@@ -3241,8 +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
@@ -3288,14 +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);
@@ -3734,12 +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
@@ -3748,9 +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);
@@ -3758,8 +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);
@@ -3948,11 +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) {
@@ -3966,36 +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;
+
+ err = kmem_cache_open(s, flags);
+ if (err)
+ return err;
- list_add(&s->list, &slab_caches);
- mutex_unlock(&slab_mutex);
- r = sysfs_slab_add(s);
- mutex_lock(&slab_mutex);
+ mutex_unlock(&slab_mutex);
+ err = sysfs_slab_add(s);
+ mutex_lock(&slab_mutex);
- if (!r)
- return s;
+ if (err)
+ kmem_cache_close(s);
- list_del(&s->list);
- kmem_cache_close(s);
- }
- kfree(s);
- }
- kfree(n);
- return NULL;
+ return err;
}
#ifdef CONFIG_SMP
@@ -5225,14 +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,
@@ -5240,7 +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)