1 files changed, 27 insertions, 44 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 240157c13ddc..89e7283015a6 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2475,44 +2475,6 @@ EXPORT_PER_CPU_SYMBOL(kstat);
 EXPORT_PER_CPU_SYMBOL(kernel_cpustat);
 
 /*
- * Return any ns on the sched_clock that have not yet been accounted in
- * @p in case that task is currently running.
- *
- * Called with task_rq_lock() held on @rq.
- */
-static u64 do_task_delta_exec(struct task_struct *p, struct rq *rq)
-{
-	u64 ns = 0;
-
-	/*
-	 * Must be ->curr _and_ ->on_rq.  If dequeued, we would
-	 * project cycles that may never be accounted to this
-	 * thread, breaking clock_gettime().
-	 */
-	if (task_current(rq, p) && task_on_rq_queued(p)) {
-		update_rq_clock(rq);
-		ns = rq_clock_task(rq) - p->se.exec_start;
-		if ((s64)ns < 0)
-			ns = 0;
-	}
-
-	return ns;
-}
-
-unsigned long long task_delta_exec(struct task_struct *p)
-{
-	unsigned long flags;
-	struct rq *rq;
-	u64 ns = 0;
-
-	rq = task_rq_lock(p, &flags);
-	ns = do_task_delta_exec(p, rq);
-	task_rq_unlock(rq, p, &flags);
-
-	return ns;
-}
-
-/*
  * Return accounted runtime for the task.
  * In case the task is currently running, return the runtime plus current's
  * pending runtime that have not been accounted yet.
@@ -2521,7 +2483,7 @@ unsigned long long task_sched_runtime(struct task_struct *p)
 {
 	unsigned long flags;
 	struct rq *rq;
-	u64 ns = 0;
+	u64 ns;
 
 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
 	/*
@@ -2540,7 +2502,16 @@ unsigned long long task_sched_runtime(struct task_struct *p)
 #endif
 
 	rq = task_rq_lock(p, &flags);
-	ns = p->se.sum_exec_runtime + do_task_delta_exec(p, rq);
+	/*
+	 * Must be ->curr _and_ ->on_rq.  If dequeued, we would
+	 * project cycles that may never be accounted to this
+	 * thread, breaking clock_gettime().
+	 */
+	if (task_current(rq, p) && task_on_rq_queued(p)) {
+		update_rq_clock(rq);
+		p->sched_class->update_curr(rq);
+	}
+	ns = p->se.sum_exec_runtime;
 	task_rq_unlock(rq, p, &flags);
 
 	return ns;
@@ -2903,10 +2874,14 @@ asmlinkage __visible void __sched schedule_user(void)
 	 * or we have been woken up remotely but the IPI has not yet arrived,
 	 * we haven't yet exited the RCU idle mode. Do it here manually until
 	 * we find a better solution.
+	 *
+	 * NB: There are buggy callers of this function.  Ideally we
+	 * should warn if prev_state != IN_USER, but that will trigger
+	 * too frequently to make sense yet.
 	 */
-	user_exit();
+	enum ctx_state prev_state = exception_enter();
 	schedule();
-	user_enter();
+	exception_exit(prev_state);
 }
 #endif
 
@@ -6368,6 +6343,10 @@ static void sched_init_numa(void)
 		if (!sched_debug())
 			break;
 	}
+
+	if (!level)
+		return;
+
 	/*
 	 * 'level' contains the number of unique distances, excluding the
 	 * identity distance node_distance(i,i).
@@ -7444,8 +7423,12 @@ void sched_move_task(struct task_struct *tsk)
 	if (unlikely(running))
 		put_prev_task(rq, tsk);
 
-	tg = container_of(task_css_check(tsk, cpu_cgrp_id,
-				lockdep_is_held(&tsk->sighand->siglock)),
+	/*
+	 * All callers are synchronized by task_rq_lock(); we do not use RCU
+	 * which is pointless here. Thus, we pass "true" to task_css_check()
+	 * to prevent lockdep warnings.
+	 */
+	tg = container_of(task_css_check(tsk, cpu_cgrp_id, true),
 			  struct task_group, css);
 	tg = autogroup_task_group(tsk, tg);
 	tsk->sched_task_group = tg;