diff options
Diffstat (limited to 'features/rt/smp-Wake-ksoftirqd-on-PREEMPT_RT-instead-do_softirq.patch')
| -rw-r--r-- | features/rt/smp-Wake-ksoftirqd-on-PREEMPT_RT-instead-do_softirq.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/features/rt/smp-Wake-ksoftirqd-on-PREEMPT_RT-instead-do_softirq.patch b/features/rt/smp-Wake-ksoftirqd-on-PREEMPT_RT-instead-do_softirq.patch new file mode 100644 index 00000000..3c937ac4 --- /dev/null +++ b/features/rt/smp-Wake-ksoftirqd-on-PREEMPT_RT-instead-do_softirq.patch @@ -0,0 +1,47 @@ +From ba932c3063ef622c49da8054b96051fc0ba50a38 Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Mon, 15 Feb 2021 18:44:12 +0100 +Subject: [PATCH 040/191] 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> +--- + kernel/smp.c | 14 ++++++++++++-- + 1 file changed, 12 insertions(+), 2 deletions(-) + +diff --git a/kernel/smp.c b/kernel/smp.c +index aeb0adfa0606..01e9d01d1866 100644 +--- a/kernel/smp.c ++++ b/kernel/smp.c +@@ -450,8 +450,18 @@ void flush_smp_call_function_from_idle(void) + + 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 && ksoftirqd->state != TASK_RUNNING) ++ wake_up_process(ksoftirqd); ++ } ++ } + + local_irq_restore(flags); + } +-- +2.19.1 + |