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1f38221511
cpuset_cpus_allowed() uses a reader lock that is sleepable under RT, which means it cannot be called inside raw_spin_lock_t context. Introduce a new cpuset_cpus_allowed_locked() helper that performs the same function as cpuset_cpus_allowed() except that the caller must have acquired the cpuset_mutex so that no further locking will be needed. Suggested-by: Waiman Long <longman@redhat.com> Signed-off-by: Pingfan Liu <piliu@redhat.com> Cc: Waiman Long <longman@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Koutný <mkoutny@suse.com> Cc: linux-kernel@vger.kernel.org To: cgroups@vger.kernel.org Reviewed-by: Chen Ridong <chenridong@huawei.com> Reviewed-by: Waiman Long <longman@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org>