diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 0ebba2d646c3..c82b805b112b 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -4265,10 +4265,21 @@ nodemask_t cpuset_mems_allowed(struct task_struct *tsk) * @nodemask: the nodemask to be checked * * Are any of the nodes in the nodemask allowed in current->mems_allowed? + * + * A cpuset update rebinds the task's mempolicy and changes mems_allowed in + * separate steps, so retry if an update raced with the check. */ int cpuset_nodemask_valid_mems_allowed(const nodemask_t *nodemask) { - return nodes_intersects(*nodemask, current->mems_allowed); + unsigned int seq; + int ret; + + do { + seq = read_mems_allowed_begin(); + ret = nodes_intersects(*nodemask, current->mems_allowed); + } while (read_mems_allowed_retry(seq)); + + return ret; } /*