mm_match_cgroup() calls cgroup_subsys_state(). we must use rcu_read_lock() to protect cgroup_subsys_state(). Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx> --- diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 1fbe14d..ce89ff0 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -47,8 +47,15 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem); extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); -#define mm_match_cgroup(mm, cgroup) \ - ((cgroup) == mem_cgroup_from_task((mm)->owner)) +static inline +int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup) +{ + struct mem_cgroup *mem; + rcu_read_lock(); + mem = mem_cgroup_from_task((mm)->owner); + rcu_read_unlock(); + return cgroup == mem; +} extern int mem_cgroup_prepare_migration(struct page *page, struct page *newpage); _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers