Dear RT folks!
I'm pleased to announce the v5.17-rc7-rt13 patch set.
Changes since v5.17-rc7-rt12:
- Instead of spawning ksoftirqd early, adjust the RCU-tasks timeout
after discussion with upstream.
Known issues
- Valentin Schneider reported a few splats on ARM64, see
https://lkml.kernel.org/r/20210810134127.1394269-1-valentin.schneider@xxxxxxx
The delta patch against v5.17-rc7-rt12 is appended below and can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.17/incr/patch-5.17-rc7-rt12-rt13.patch.xz
You can get this release via the git tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v5.17-rc7-rt13
The RT patch against v5.17-rc7 can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.17/older/patch-5.17-rc7-rt13.patch.xz
The split quilt queue is available at:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.17/older/patches-5.17-rc7-rt13.tar.xz
Sebastian
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index e286e6b6fdf9b..db4a23d07a571 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -600,7 +600,6 @@ asmlinkage void __do_softirq(void);
extern void open_softirq(int nr, void (*action)(struct softirq_action *));
extern void softirq_init(void);
-extern void softirq_spawn_ksoftirqd(void);
extern void __raise_softirq_irqoff(unsigned int nr);
extern void raise_softirq_irqoff(unsigned int nr);
diff --git a/init/main.c b/init/main.c
index a0014b8bae203..65fa2e41a9c09 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1598,7 +1598,6 @@ static noinline void __init kernel_init_freeable(void)
init_mm_internals();
- softirq_spawn_ksoftirqd();
rcu_init_tasks_generic();
do_pre_smp_initcalls();
lockup_detector_init();
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index f804afb304135..e99f9e61cc7a3 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -630,12 +630,15 @@ static void rcu_tasks_wait_gp(struct rcu_tasks *rtp)
while (!list_empty(&holdouts)) {
bool firstreport;
bool needreport;
+ ktime_t exp;
int rtst;
/* Slowly back off waiting for holdouts */
set_tasks_gp_state(rtp, RTGS_WAIT_SCAN_HOLDOUTS);
- schedule_timeout_idle(fract);
-
+ exp = jiffies_to_nsecs(fract);
+ __set_current_state(TASK_IDLE);
+ schedule_hrtimeout_range(&exp, jiffies_to_nsecs(HZ / 2),
+ HRTIMER_MODE_REL_HARD);
if (fract < HZ)
fract++;
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 32c1c503b9d65..22948c2109f5b 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -1037,14 +1037,17 @@ static struct smp_hotplug_thread timer_threads = {
.thread_comm = "ktimers/%u",
};
-__init void softirq_spawn_ksoftirqd(void)
+static __init int spawn_ksoftirqd(void)
{
cpuhp_setup_state_nocalls(CPUHP_SOFTIRQ_DEAD, "softirq:dead", NULL,
takeover_tasklets);
BUG_ON(smpboot_register_percpu_thread(&softirq_threads));
if (IS_ENABLED(CONFIG_PREEMPT_RT))
BUG_ON(smpboot_register_percpu_thread(&timer_threads));
+
+ return 0;
}
+early_initcall(spawn_ksoftirqd);
/*
* [ These __weak aliases are kept in a separate compilation unit, so that
diff --git a/localversion-rt b/localversion-rt
index 6e44e540b927b..9f7d0bdbffb18 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt12
+-rt13
