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@xxxxxxxxxxxxx>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e3a2e4d65cc5..28f0aa0a2ce5 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5011,7 +5011,7 @@ static struct mem_cgroup *mem_cgroup_alloc(void)
return ERR_PTR(error);
memcg->id.id = idr_alloc(&mem_cgroup_idr, NULL,
- MEM_CGROUP_ID_MIN, MEM_CGROUP_ID_MAX,
+ MEM_CGROUP_ID_MIN, MEM_CGROUP_ID_MAX + 1,
GFP_KERNEL);
if (memcg->id.id < 0) {
error = memcg->id.id;
--
2.11.0
