diff options
Diffstat (limited to 'debian/patches-rt/0131-smp-Wake-ksoftirqd-on-PREEMPT_RT-instead-do_softirq.patch')
| -rw-r--r-- | debian/patches-rt/0131-smp-Wake-ksoftirqd-on-PREEMPT_RT-instead-do_softirq.patch | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/debian/patches-rt/0131-smp-Wake-ksoftirqd-on-PREEMPT_RT-instead-do_softirq.patch b/debian/patches-rt/0131-smp-Wake-ksoftirqd-on-PREEMPT_RT-instead-do_softirq.patch new file mode 100644 index 000000000..19d4f6615 --- /dev/null +++ b/debian/patches-rt/0131-smp-Wake-ksoftirqd-on-PREEMPT_RT-instead-do_softirq.patch @@ -0,0 +1,48 @@ +From d6a969bae816bcd5ac549038a4582d300ede6b99 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 131/323] smp: Wake ksoftirqd on PREEMPT_RT instead + do_softirq(). +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +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 b0684b4c111e..4aaf11aa729c 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); + } +-- +2.43.0 + |