On 11/29/2017 05:13 PM, Julia Cartwright wrote:
Hello RT Folks!
I'm pleased to announce the 4.1.46-rt52 stable release.
You can get this release via the git tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git
branch: v4.1-rt
Head SHA1: 6e737a91c1ce923d4e10db831e14cfef9a2459cc
Or to build 4.1.46-rt52 directly, the following patches should be applied:
http://www.kernel.org/pub/linux/kernel/v4.x/linux-4.1.tar.xz
http://www.kernel.org/pub/linux/kernel/v4.x/patch-4.1.46.xz
http://www.kernel.org/pub/linux/kernel/projects/rt/4.1/patch-4.1.46-rt52.patch.xz
You can also build from 4.1.46-rt51 by applying the incremental patch:
http://www.kernel.org/pub/linux/kernel/projects/rt/4.1/incr/patch-4.1.46-rt51-rt52.patch.xz
Enjoy!
Julia
Changes from v4.1.46-rt51:
---
Julia Cartwright (2):
workqueue: fixup rcu check for RT
Linux 4.1.46-rt52
Sebastian Andrzej Siewior (2):
PM / CPU: replace raw_notifier with atomic_notifier (fixup)
This change breaks the compile of 4.1 on ARM (and other things using
kernel/cpu_pm.c).
rcu_irq_enter_irqson() and friends doesn't exist in 4.1. In fact,
rcu_irq_enter() doesn't even exist.
Sorry I didn't get to testing this earlier, I've been focused on other things.
-corey
kernel/hrtimer: migrate deferred timer on CPU down
---
kernel/cpu_pm.c | 7 +++++++
kernel/time/hrtimer.c | 5 +++++
kernel/workqueue.c | 2 +-
localversion-rt | 2 +-
4 files changed, 14 insertions(+), 2 deletions(-)
---
diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c
index 9da42f83ee03..d1d1c3961553 100644
--- a/kernel/cpu_pm.c
+++ b/kernel/cpu_pm.c
@@ -28,8 +28,15 @@ static int cpu_pm_notify(enum cpu_pm_event event, int nr_to_call, int *nr_calls)
{
int ret;
+ /*
+ * __atomic_notifier_call_chain has a RCU read critical section, which
+ * could be disfunctional in cpu idle. Copy RCU_NONIDLE code to let
+ * RCU know this.
+ */
+ rcu_irq_enter_irqson();
ret = __atomic_notifier_call_chain(&cpu_pm_notifier_chain, event, NULL,
nr_to_call, nr_calls);
+ rcu_irq_exit_irqson();
return notifier_to_errno(ret);
}
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 2c6be169bdc7..75c990b00525 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1951,6 +1951,11 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
/* Clear the migration state bit */
timer->state &= ~HRTIMER_STATE_MIGRATE;
}
+#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);
+#endif
}
static void migrate_hrtimers(int scpu)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 6bdcab98501c..90e261c8811e 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -363,7 +363,7 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
"RCU or wq->mutex should be held")
#define assert_rcu_or_wq_mutex_or_pool_mutex(wq) \
- rcu_lockdep_assert(rcu_read_lock_sched_held() || \
+ rcu_lockdep_assert(rcu_read_lock_held() || \
lockdep_is_held(&wq->mutex) || \
lockdep_is_held(&wq_pool_mutex), \
"sched RCU, wq->mutex or wq_pool_mutex should be held")
diff --git a/localversion-rt b/localversion-rt
index 75493460c41f..66a5ed8bf3d7 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt51
+-rt52
--
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