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-rw-r--r--mm/list_lru.c34
1 files changed, 23 insertions, 11 deletions
diff --git a/mm/list_lru.c b/mm/list_lru.c
index e1da19fac1b3..28237476b055 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -42,6 +42,10 @@ static void list_lru_unregister(struct list_lru *lru)
#ifdef CONFIG_MEMCG_KMEM
static inline bool list_lru_memcg_aware(struct list_lru *lru)
{
+ /*
+ * This needs node 0 to be always present, even
+ * in the systems supporting sparse numa ids.
+ */
return !!lru->node[0].memcg_lrus;
}
@@ -377,16 +381,20 @@ static int memcg_init_list_lru(struct list_lru *lru, bool memcg_aware)
{
int i;
- for (i = 0; i < nr_node_ids; i++) {
- if (!memcg_aware)
- lru->node[i].memcg_lrus = NULL;
- else if (memcg_init_list_lru_node(&lru->node[i]))
+ if (!memcg_aware)
+ return 0;
+
+ for_each_node(i) {
+ if (memcg_init_list_lru_node(&lru->node[i]))
goto fail;
}
return 0;
fail:
- for (i = i - 1; i >= 0; i--)
+ for (i = i - 1; i >= 0; i--) {
+ if (!lru->node[i].memcg_lrus)
+ continue;
memcg_destroy_list_lru_node(&lru->node[i]);
+ }
return -ENOMEM;
}
@@ -397,7 +405,7 @@ static void memcg_destroy_list_lru(struct list_lru *lru)
if (!list_lru_memcg_aware(lru))
return;
- for (i = 0; i < nr_node_ids; i++)
+ for_each_node(i)
memcg_destroy_list_lru_node(&lru->node[i]);
}
@@ -409,16 +417,20 @@ static int memcg_update_list_lru(struct list_lru *lru,
if (!list_lru_memcg_aware(lru))
return 0;
- for (i = 0; i < nr_node_ids; i++) {
+ for_each_node(i) {
if (memcg_update_list_lru_node(&lru->node[i],
old_size, new_size))
goto fail;
}
return 0;
fail:
- for (i = i - 1; i >= 0; i--)
+ for (i = i - 1; i >= 0; i--) {
+ if (!lru->node[i].memcg_lrus)
+ continue;
+
memcg_cancel_update_list_lru_node(&lru->node[i],
old_size, new_size);
+ }
return -ENOMEM;
}
@@ -430,7 +442,7 @@ static void memcg_cancel_update_list_lru(struct list_lru *lru,
if (!list_lru_memcg_aware(lru))
return;
- for (i = 0; i < nr_node_ids; i++)
+ for_each_node(i)
memcg_cancel_update_list_lru_node(&lru->node[i],
old_size, new_size);
}
@@ -485,7 +497,7 @@ static void memcg_drain_list_lru(struct list_lru *lru,
if (!list_lru_memcg_aware(lru))
return;
- for (i = 0; i < nr_node_ids; i++)
+ for_each_node(i)
memcg_drain_list_lru_node(&lru->node[i], src_idx, dst_idx);
}
@@ -522,7 +534,7 @@ int __list_lru_init(struct list_lru *lru, bool memcg_aware,
if (!lru->node)
goto out;
- for (i = 0; i < nr_node_ids; i++) {
+ for_each_node(i) {
spin_lock_init(&lru->node[i].lock);
if (key)
lockdep_set_class(&lru->node[i].lock, key);