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Subject[ANNOUNCE] v4.11.12-rt12
Dear RT folks!

I'm pleased to announce the v4.11.12-rt12 patch set.

Changes since v4.11.12-rt11:

- In the hrtimer/hotplug fix in the last release, there was one
call path missed. Mike Galbraith reported it and sent a patch to
handle it.

Known issues
- There was a report regarding a deadlock within the rtmutex code.

The delta patch against v4.11.12-rt11 is appended below and can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.11/incr/patch-4.11.12-rt11-rt12.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 v4.11.12-rt12

The RT patch against v4.11.12 can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.11/older/patch-4.11.12-rt12.patch.xz

The split quilt queue is available at:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.11/older/patches-4.11.12-rt12.tar.xz

Sebastian
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1779,7 +1779,7 @@ int hrtimers_prepare_cpu(unsigned int cpu)

#ifdef CONFIG_HOTPLUG_CPU

-static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
+static int migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
struct hrtimer_clock_base *new_base)
{
struct hrtimer *timer;
@@ -1809,15 +1809,19 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
}
#ifdef CONFIG_PREEMPT_RT_BASE
list_splice_tail(&old_base->expired, &new_base->expired);
- if (!list_empty(&new_base->expired))
- raise_softirq_irqoff(HRTIMER_SOFTIRQ);
+ /*
+ * Tell the caller to raise HRTIMER_SOFTIRQ. We can't safely
+ * acquire ktimersoftd->pi_lock while the base lock is held.
+ */
+ return !list_empty(&new_base->expired);
#endif
+ return 0;
}

int hrtimers_dead_cpu(unsigned int scpu)
{
struct hrtimer_cpu_base *old_base, *new_base;
- int i;
+ int i, raise = 0;

BUG_ON(cpu_online(scpu));
tick_cancel_sched_timer(scpu);
@@ -1833,13 +1837,16 @@ int hrtimers_dead_cpu(unsigned int scpu)
raw_spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);

for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
- migrate_hrtimer_list(&old_base->clock_base[i],
- &new_base->clock_base[i]);
+ raise |= migrate_hrtimer_list(&old_base->clock_base[i],
+ &new_base->clock_base[i]);
}

raw_spin_unlock(&old_base->lock);
raw_spin_unlock(&new_base->lock);

+ if (raise)
+ raise_softirq_irqoff(HRTIMER_SOFTIRQ);
+
/* Check, if we got expired work to do */
__hrtimer_peek_ahead_timers();
local_irq_enable();
diff --git a/localversion-rt b/localversion-rt
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt11
+-rt12
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