diff mbox series

[v6,14/16] mm: memcontrol: fix cannot alloc the maximum memcg ID

Message ID 20220228122126.37293-15-songmuchun@bytedance.com (mailing list archive)
State New, archived
Headers show
Series Optimize list lru memory consumption | expand

Commit Message

Muchun Song Feb. 28, 2022, 12:21 p.m. UTC 
The idr_alloc() does not include @max ID. So in the current implementation,
the maximum memcg ID is 65534 instead of 65535. It seems a bug. So fix this.

Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
 mm/memcontrol.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 809dfa4b2abc..cbe6f9bb37bb 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5029,8 +5029,7 @@  static struct mem_cgroup *mem_cgroup_alloc(void)
 		return ERR_PTR(error);
 
 	memcg->id.id = idr_alloc(&mem_cgroup_idr, NULL,
-				 1, MEM_CGROUP_ID_MAX,
-				 GFP_KERNEL);
+				 1, MEM_CGROUP_ID_MAX + 1, GFP_KERNEL);
 	if (memcg->id.id < 0) {
 		error = memcg->id.id;
 		goto fail;