3 files changed, 3 insertions, 2 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3b07168b6f03..ee1f88993097 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1028,6 +1028,7 @@ struct sched_domain;
  * wake flags
  */
 #define WF_SYNC         0x01            /* waker goes to sleep after wakup */
+#define WF_FORK         0x02            /* child wakeup after fork */
 
 struct sched_class {
         const struct sched_class *next;
diff --git a/kernel/sched.c b/kernel/sched.c
index 4da335cec8ee..0d4c4fea3317 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2602,7 +2602,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
                 inc_nr_running(rq);
         }
         trace_sched_wakeup_new(rq, p, 1);
-        check_preempt_curr(rq, p, 0);
+        check_preempt_curr(rq, p, WF_FORK);
 #ifdef CONFIG_SMP
         if (p->sched_class->task_wake_up)
                 p->sched_class->task_wake_up(rq, p);
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 007958e3c93a..6766959c7f44 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1580,7 +1580,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int flags
          */
         if (sched_feat(LAST_BUDDY) && likely(se->on_rq && curr != rq->idle))
                 set_last_buddy(se);
-        if (sched_feat(NEXT_BUDDY))
+        if (sched_feat(NEXT_BUDDY) && !(flags & WF_FORK))
                 set_next_buddy(pse);
 
         /*