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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2021-09-27 10:38:14 +0300 |
|---|---|---|
| committer | Minda Chen <minda.chen@starfivetech.com> | 2023-11-06 14:24:41 +0300 |
| commit | 4a5ffdec1aa9d11d4eac1b45ff0ecd83ca8bcb64 (patch) | |
| tree | 6b40d424758945d7201af56679b22fe37a3d337b | |
| parent | b3d89e9d915153d6e7a2d56a61217292663be4bb (diff) | |
| download | linux-4a5ffdec1aa9d11d4eac1b45ff0ecd83ca8bcb64.tar.xz | |
smp: Wake ksoftirqd on PREEMPT_RT instead do_softirq().
The softirq implementation on PREEMPT_RT does not provide do_softirq().
The other user of do_softirq() is replaced with a local_bh_disable()
+ enable() around the possible raise-softirq invocation. This can not be
done here because migration_cpu_stop() is invoked with disabled
preemption.
Wake the softirq thread on PREEMPT_RT if there are any pending softirqs.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20210927073814.x5h6osr4dgiu44sc@linutronix.de
| -rw-r--r-- | kernel/smp.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/kernel/smp.c b/kernel/smp.c index f43ede0ab183..f0f26e1a0031 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -690,10 +690,20 @@ void flush_smp_call_function_from_idle(void) cfd_seq_store(this_cpu_ptr(&cfd_seq_local)->idle, CFD_SEQ_NOCPU, smp_processor_id(), CFD_SEQ_IDLE); + local_irq_save(flags); flush_smp_call_function_queue(true); - if (local_softirq_pending()) - do_softirq(); + + if (local_softirq_pending()) { + if (!IS_ENABLED(CONFIG_PREEMPT_RT)) { + do_softirq(); + } else { + struct task_struct *ksoftirqd = this_cpu_ksoftirqd(); + + if (ksoftirqd && !task_is_running(ksoftirqd)) + wake_up_process(ksoftirqd); + } + } local_irq_restore(flags); } |