[ANNOUNCE] 4.4.220-rt197

From: Daniel Wagner
Date: Sat May 16 2020 - 14:54:01 EST


Hello RT-list!

I'm pleased to announce the 4.4.220-rt197 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: v4.4-rt
Head SHA1: 375a1effc06c4f59c65c6fa8657e44539d997680

Or to build 4.4.220-rt197 directly, the following patches should be applied:

https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.4.tar.xz

https://www.kernel.org/pub/linux/kernel/v4.x/patch-4.4.220.xz

https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patch-4.4.220-rt197.patch.xz


Enjoy!
Daniel

Changes from v4.4.220-rt196:
---

Daniel Wagner (1):
Linux 4.4.220-rt197

Steven Rostedt (VMware) (1):
irq_work: Fix checking of IRQ_WORK_LAZY flag set on non PREEMPT_RT
---
kernel/irq_work.c | 12 +++++++++---
localversion-rt | 2 +-
2 files changed, 10 insertions(+), 4 deletions(-)
---
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index 2899ba0d23d1..abc65de5d793 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -57,6 +57,12 @@ void __weak arch_irq_work_raise(void)
*/
}

+static inline bool use_lazy_list(struct irq_work *work)
+{
+ return (IS_ENABLED(CONFIG_PREEMPT_RT_FULL) && !(work->flags & IRQ_WORK_HARD_IRQ))
+ || (work->flags & IRQ_WORK_LAZY);
+}
+
#ifdef CONFIG_SMP
/*
* Enqueue the irq_work @work on @cpu unless it's already pending
@@ -78,7 +84,7 @@ bool irq_work_queue_on(struct irq_work *work, int cpu)
if (!irq_work_claim(work))
return false;

- if (IS_ENABLED(CONFIG_PREEMPT_RT_FULL) && !(work->flags & IRQ_WORK_HARD_IRQ))
+ if (use_lazy_list(work))
list = &per_cpu(lazy_list, cpu);
else
list = &per_cpu(raised_list, cpu);
@@ -95,7 +101,7 @@ EXPORT_SYMBOL_GPL(irq_work_queue_on);
bool irq_work_queue(struct irq_work *work)
{
struct llist_head *list;
- bool lazy_work, realtime = IS_ENABLED(CONFIG_PREEMPT_RT_FULL);
+ int lazy_work;

/* Only queue if not already pending */
if (!irq_work_claim(work))
@@ -106,7 +112,7 @@ bool irq_work_queue(struct irq_work *work)

lazy_work = work->flags & IRQ_WORK_LAZY;

- if (lazy_work || (realtime && !(work->flags & IRQ_WORK_HARD_IRQ)))
+ if (use_lazy_list(work))
list = this_cpu_ptr(&lazy_list);
else
list = this_cpu_ptr(&raised_list);
diff --git a/localversion-rt b/localversion-rt
index 9bc39cfc747c..7cbd4fa29217 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt196
+-rt197