cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowed

The rule is, we have to update tsk->rt.nr_cpus_allowed if we change
tsk->cpus_allowed. Otherwise RT scheduler may confuse.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/4DD4B3FA.5060901@jp.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 1ceeb049c827..9c9b7545c810 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -2190,7 +2190,7 @@ int cpuset_cpus_allowed_fallback(struct task_struct *tsk)
         rcu_read_lock();
         cs = task_cs(tsk);
         if (cs)
-                cpumask_copy(&tsk->cpus_allowed, cs->cpus_allowed);
+                do_set_cpus_allowed(tsk, cs->cpus_allowed);
         rcu_read_unlock();
 
         /*
@@ -2217,7 +2217,7 @@ int cpuset_cpus_allowed_fallback(struct task_struct *tsk)
                  * Like above we can temporary set any mask and rely on
                  * set_cpus_allowed_ptr() as synchronization point.
                  */
-                cpumask_copy(&tsk->cpus_allowed, cpu_possible_mask);
+                do_set_cpus_allowed(tsk, cpu_possible_mask);
                 cpu = cpumask_any(cpu_active_mask);
         }