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- Make sure the idle timer expires in hardirq context, on PREEMPT_RT

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- Make sure the run-queue balance callback is invoked only on the outgoing CPU
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Merge tag 'sched_urgent_for_v5.15_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fixes from Borislav Petkov:

 - Make sure the idle timer expires in hardirq context, on PREEMPT_RT

 - Make sure the run-queue balance callback is invoked only on the
   outgoing CPU

* tag 'sched_urgent_for_v5.15_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched: Prevent balance_push() on remote runqueues
  sched/idle: Make the idle timer expire in hard interrupt context
This commit is contained in:
Linus Torvalds 2021-09-12 11:37:41 -07:00
commit 56c244382f
2 changed files with 5 additions and 5 deletions
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6
kernel/sched/core.c
View File

@ -8836,7 +8836,6 @@ static void balance_push(struct rq *rq)
struct task_struct *push_task = rq->curr;
lockdep_assert_rq_held(rq);
SCHED_WARN_ON(rq->cpu != smp_processor_id());
/*
* Ensure the thing is persistent until balance_push_set(.on = false);
@ -8844,9 +8843,10 @@ static void balance_push(struct rq *rq)
rq->balance_callback = &balance_push_callback;
/*
* Only active while going offline.
* Only active while going offline and when invoked on the outgoing
* CPU.
*/
if (!cpu_dying(rq->cpu))
if (!cpu_dying(rq->cpu) || rq != this_rq())
return;
/*

4
kernel/sched/idle.c
View File

@ -379,10 +379,10 @@ void play_idle_precise(u64 duration_ns, u64 latency_ns)
cpuidle_use_deepest_state(latency_ns);
it.done = 0;
hrtimer_init_on_stack(&it.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer_init_on_stack(&it.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
it.timer.function = idle_inject_timer_fn;
hrtimer_start(&it.timer, ns_to_ktime(duration_ns),
HRTIMER_MODE_REL_PINNED);
HRTIMER_MODE_REL_PINNED_HARD);
while (!READ_ONCE(it.done))
do_idle();