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41 lines
1.2 KiB
Diff
41 lines
1.2 KiB
Diff
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Mon, 15 Feb 2021 18:44:12 +0100
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Subject: [PATCH] smp: Wake ksoftirqd on PREEMPT_RT instead do_softirq().
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The softirq implementation on PREEMPT_RT does not provide do_softirq().
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The other user of do_softirq() is replaced with a local_bh_disable()
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+ enable() around the possible raise-softirq invocation. This can not be
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done here because migration_cpu_stop() is invoked with disabled
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preemption.
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Wake the softirq thread on PREEMPT_RT if there are any pending softirqs.
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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kernel/smp.c | 14 ++++++++++++--
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1 file changed, 12 insertions(+), 2 deletions(-)
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--- a/kernel/smp.c
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+++ b/kernel/smp.c
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@@ -450,8 +450,18 @@ void flush_smp_call_function_from_idle(v
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local_irq_save(flags);
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flush_smp_call_function_queue(true);
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- if (local_softirq_pending())
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- do_softirq();
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+
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+ if (local_softirq_pending()) {
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+
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+ if (!IS_ENABLED(CONFIG_PREEMPT_RT)) {
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+ do_softirq();
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+ } else {
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+ struct task_struct *ksoftirqd = this_cpu_ksoftirqd();
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+
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+ if (ksoftirqd && ksoftirqd->state != TASK_RUNNING)
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+ wake_up_process(ksoftirqd);
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+ }
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+ }
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local_irq_restore(flags);
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}
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