futex: Fix potential use-after-free in FUTEX_REQUEUE_PI

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / sched / rt.c

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 127a2c4cf4ab4f176bbf554be2ad34f4d597c258..2dffc7b5d469fe69c73a278b073b9034c4f77c9f 100644 (file)
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -892,7 +892,7 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
 
                        if (!once) {
                                once = true;
-                               printk_sched("sched: RT throttling activated\n");
+                               printk_deferred("sched: RT throttling activated\n");
                        }
                } else {
                        /*
@@ -964,6 +964,13 @@ inc_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio)
 {
        struct rq *rq = rq_of_rt_rq(rt_rq);
 
+#ifdef CONFIG_RT_GROUP_SCHED
+       /*
+        * Change rq's cpupri only if rt_rq is the top queue.
+        */
+       if (&rq->rt != rt_rq)
+               return;
+#endif
        if (rq->online && prio < prev_prio)
                cpupri_set(&rq->rd->cpupri, rq->cpu, prio);
 }
@@ -973,6 +980,13 @@ dec_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio)
 {
        struct rq *rq = rq_of_rt_rq(rt_rq);
 
+#ifdef CONFIG_RT_GROUP_SCHED
+       /*
+        * Change rq's cpupri only if rt_rq is the top queue.
+        */
+       if (&rq->rt != rt_rq)
+               return;
+#endif
        if (rq->online && rt_rq->highest_prio.curr != prev_prio)
                cpupri_set(&rq->rd->cpupri, rq->cpu, rt_rq->highest_prio.curr);
 }