[rt] Update to 5.4.3-rt1 and re-enable

Adjust for context changes due to backport of
e66b39af00f4 ("workqueue: Fix pwq ref leak in rescuer_thread()") and
def98c84b6cd ("workqueue: Fix spurious sanity check failures in
destroy_workqueue()") in 5.4.4.

1 files changed, 0 insertions, 33 deletions

diff --git a/debian/patches-rt/0001-hrtimer-Use-READ_ONCE-to-access-timer-base-in-hrimer.patch b/debian/patches-rt/0001-hrtimer-Use-READ_ONCE-to-access-timer-base-in-hrimer.patch
deleted file mode 100644
index 8911788e2..000000000
--- a/debian/patches-rt/0001-hrtimer-Use-READ_ONCE-to-access-timer-base-in-hrimer.patch
+++ /dev/null
@@ -1,33 +0,0 @@
-From: Julien Grall <julien.grall@arm.com>
-Date: Wed, 21 Aug 2019 10:24:07 +0100
-Subject: [PATCH 1/3] hrtimer: Use READ_ONCE to access timer->base in
- hrimer_grab_expiry_lock()
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.2/older/patches-5.2.17-rt9.tar.xz
-
-The update to timer->base is protected by the base->cpu_base->lock().
-However, hrtimer_grab_expirty_lock() does not access it with the lock.
-
-So it would theorically be possible to have timer->base changed under
-our feet. We need to prevent the compiler to refetch timer->base so the
-check and the access is performed on the same base.
-
-Other access of timer->base are either done with a lock or protected
-with READ_ONCE(). So use READ_ONCE() in hrtimer_grab_expirty_lock().
-
-Signed-off-by: Julien Grall <julien.grall@arm.com>
-Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
----
- kernel/time/hrtimer.c |    2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
---- a/kernel/time/hrtimer.c
-+++ b/kernel/time/hrtimer.c
-@@ -932,7 +932,7 @@ EXPORT_SYMBOL_GPL(hrtimer_forward);
- 
- void hrtimer_grab_expiry_lock(const struct hrtimer *timer)
- {
--	struct hrtimer_clock_base *base = timer->base;
-+	struct hrtimer_clock_base *base = READ_ONCE(timer->base);
- 
- 	if (base && base->cpu_base) {
- 		spin_lock(&base->cpu_base->softirq_expiry_lock);