1 files changed, 37 insertions, 0 deletions
diff --git a/debian/patches-rt/0176-fs-epoll-Do-not-disable-preemption-on-RT.patch b/debian/patches-rt/0176-fs-epoll-Do-not-disable-preemption-on-RT.patch
new file mode 100644
index 000000000..bf911af26
--- /dev/null
+++ b/debian/patches-rt/0176-fs-epoll-Do-not-disable-preemption-on-RT.patch
@@ -0,0 +1,37 @@
+From 6507a3f1c5cfe4486efb5aada6114437dd6d099f Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Fri, 8 Jul 2011 16:35:35 +0200
+Subject: [PATCH 176/347] fs/epoll: Do not disable preemption on RT
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
+
+ep_call_nested() takes a sleeping lock so we can't disable preemption.
+The light version is enough since ep_call_nested() doesn't mind beeing
+invoked twice on the same CPU.
+
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+---
+ fs/eventpoll.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/fs/eventpoll.c b/fs/eventpoll.c
+index a4a32b79e832..8569db5eceb0 100644
+--- a/fs/eventpoll.c
++++ b/fs/eventpoll.c
+@@ -569,12 +569,12 @@ static int ep_poll_wakeup_proc(void *priv, void *cookie, int call_nests)
+ 
+ static void ep_poll_safewake(wait_queue_head_t *wq)
+ {
+-	int this_cpu = get_cpu();
++	int this_cpu = get_cpu_light();
+ 
+ 	ep_call_nested(&poll_safewake_ncalls, EP_MAX_NESTS,
+ 		       ep_poll_wakeup_proc, NULL, wq, (void *) (long) this_cpu);
+ 
+-	put_cpu();
++	put_cpu_light();
+ }
+ 
+ #else
+-- 
+2.36.1
+