diff options
Diffstat (limited to 'mm/list_lru.c')
| -rw-r--r-- | mm/list_lru.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/mm/list_lru.c b/mm/list_lru.c index 07e198c77888..a9021cb3ccde 100644 --- a/mm/list_lru.c +++ b/mm/list_lru.c @@ -9,6 +9,34 @@ #include <linux/mm.h> #include <linux/list_lru.h> #include <linux/slab.h> +#include <linux/mutex.h> + +#ifdef CONFIG_MEMCG_KMEM +static LIST_HEAD(list_lrus); +static DEFINE_MUTEX(list_lrus_mutex); + +static void list_lru_register(struct list_lru *lru) +{ + mutex_lock(&list_lrus_mutex); + list_add(&lru->list, &list_lrus); + mutex_unlock(&list_lrus_mutex); +} + +static void list_lru_unregister(struct list_lru *lru) +{ + mutex_lock(&list_lrus_mutex); + list_del(&lru->list); + mutex_unlock(&list_lrus_mutex); +} +#else +static void list_lru_register(struct list_lru *lru) +{ +} + +static void list_lru_unregister(struct list_lru *lru) +{ +} +#endif /* CONFIG_MEMCG_KMEM */ bool list_lru_add(struct list_lru *lru, struct list_head *item) { @@ -137,12 +165,18 @@ int list_lru_init_key(struct list_lru *lru, struct lock_class_key *key) INIT_LIST_HEAD(&lru->node[i].list); lru->node[i].nr_items = 0; } + list_lru_register(lru); return 0; } EXPORT_SYMBOL_GPL(list_lru_init_key); void list_lru_destroy(struct list_lru *lru) { + /* Already destroyed or not yet initialized? */ + if (!lru->node) + return; + list_lru_unregister(lru); kfree(lru->node); + lru->node = NULL; } EXPORT_SYMBOL_GPL(list_lru_destroy); |