1 files changed, 37 insertions, 0 deletions
diff --git a/debian/patches-rt/0163-rcu-enable-rcu_normal_after_boot-by-default-for-RT.patch b/debian/patches-rt/0163-rcu-enable-rcu_normal_after_boot-by-default-for-RT.patch
new file mode 100644
index 000000000..495aa2d9d
--- /dev/null
+++ b/debian/patches-rt/0163-rcu-enable-rcu_normal_after_boot-by-default-for-RT.patch
@@ -0,0 +1,37 @@
+From 4da02c2768978a9206e437ab36a1d6e9ed2641af Mon Sep 17 00:00:00 2001
+From: Julia Cartwright <julia@ni.com>
+Date: Wed, 12 Oct 2016 11:21:14 -0500
+Subject: [PATCH 163/347] rcu: enable rcu_normal_after_boot by default for RT
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
+
+The forcing of an expedited grace period is an expensive and very
+RT-application unfriendly operation, as it forcibly preempts all running
+tasks on CPUs which are preventing the gp from expiring.
+
+By default, as a policy decision, disable the expediting of grace
+periods (after boot) on configurations which enable PREEMPT_RT_FULL.
+
+Suggested-by: Luiz Capitulino <lcapitulino@redhat.com>
+Acked-by: Paul E. McKenney <paulmck@linux.ibm.com>
+Signed-off-by: Julia Cartwright <julia@ni.com>
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+---
+ kernel/rcu/update.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
+index 6ffafb1b1584..16d8dba23329 100644
+--- a/kernel/rcu/update.c
++++ b/kernel/rcu/update.c
+@@ -68,7 +68,7 @@ extern int rcu_expedited; /* from sysctl */
+ module_param(rcu_expedited, int, 0);
+ extern int rcu_normal; /* from sysctl */
+ module_param(rcu_normal, int, 0);
+-static int rcu_normal_after_boot;
++static int rcu_normal_after_boot = IS_ENABLED(CONFIG_PREEMPT_RT_FULL);
+ module_param(rcu_normal_after_boot, int, 0);
+ #endif /* #ifndef CONFIG_TINY_RCU */
+ 
+-- 
+2.36.1
+