1 files changed, 35 insertions, 0 deletions
diff --git a/debian/patches-rt/0228-sched-Allow-pinned-user-tasks-to-be-awakened-to-the-.patch b/debian/patches-rt/0228-sched-Allow-pinned-user-tasks-to-be-awakened-to-the-.patch
new file mode 100644
index 000000000..817e0736d
--- /dev/null
+++ b/debian/patches-rt/0228-sched-Allow-pinned-user-tasks-to-be-awakened-to-the-.patch
@@ -0,0 +1,35 @@
+From: Mike Galbraith <efault@gmx.de>
+Date: Sun, 19 Aug 2018 08:28:35 +0200
+Subject: [PATCH 228/342] sched: Allow pinned user tasks to be awakened to the
+ CPU they pinned
+Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=1a7a03ac5f6eb866ddd317630b747d6e8f81013b
+
+Since commit 7af443ee16976 ("sched/core: Require cpu_active() in
+select_task_rq(), for user tasks") select_fallback_rq() will BUG() if
+the CPU to which a task has pinned itself and pinned becomes
+!cpu_active() while it slept.
+The task will continue running on the to-be-removed CPU and will remove
+itself from the CPU during takedown_cpu() (while cpuhp_pin_lock will be
+acquired) and move to another CPU based on its mask after the
+migrate_disable() section has been left.
+
+Cc: stable-rt@vger.kernel.org
+Signed-off-by: Mike Galbraith <efault@gmx.de>
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+---
+ kernel/sched/core.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/kernel/sched/core.c b/kernel/sched/core.c
+index 11afaa2c618a..dba425296275 100644
+--- a/kernel/sched/core.c
++++ b/kernel/sched/core.c
+@@ -904,7 +904,7 @@ static inline bool is_cpu_allowed(struct task_struct *p, int cpu)
+ 	if (!cpumask_test_cpu(cpu, p->cpus_ptr))
+ 		return false;
+ 
+-	if (is_per_cpu_kthread(p))
++	if (is_per_cpu_kthread(p) || __migrate_disabled(p))
+ 		return cpu_online(cpu);
+ 
+ 	return cpu_active(cpu);