[PATCH v2 19/21] mm: memcontrol: fix cannot alloc the maximum memcg ID
From: Muchun Song <hidden>
Date: 2021-05-27 06:27:02
Also in:
linux-fsdevel, linux-nfs, lkml
Subsystem:
control group - memory resource controller (memcg), memory management, the rest · Maintainers:
Johannes Weiner, Michal Hocko, Roman Gushchin, Shakeel Butt, Andrew Morton, Linus Torvalds
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 <redacted> --- mm/memcontrol.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ae3ad1001824..a1c8ec858593 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c@@ -5044,7 +5044,7 @@ 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, + 1, MEM_CGROUP_ID_MAX + 1, GFP_KERNEL); if (memcg->id.id < 0) { error = memcg->id.id;
--
2.11.0