1 files changed, 71 insertions, 0 deletions
diff --git a/debian/patches-rt/0295-hrtimer-Add-a-missing-bracket-and-hide-migration_bas.patch b/debian/patches-rt/0295-hrtimer-Add-a-missing-bracket-and-hide-migration_bas.patch
new file mode 100644
index 000000000..f24fd1199
--- /dev/null
+++ b/debian/patches-rt/0295-hrtimer-Add-a-missing-bracket-and-hide-migration_bas.patch
@@ -0,0 +1,71 @@
+From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Date: Wed, 4 Sep 2019 16:55:27 +0200
+Subject: [PATCH 295/342] hrtimer: Add a missing bracket and hide
+ `migration_base' on !SMP
+Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=44e95bce9a5f97221e79be2d034fafe617dff0f7
+
+[ Upstream commit 47b6de0b7f22c28b40275aeede3993d807668c3b ]
+
+[ Upstream commit 5d2295f3a93b04986d069ebeaf5b07725f9096c1 ]
+
+The recent change to avoid taking the expiry lock when a timer is currently
+migrated missed to add a bracket at the end of the if statement leading to
+compile errors.  Since that commit the variable `migration_base' is always
+used but it is only available on SMP configuration thus leading to another
+compile error.  The changelog says "The timer base and base->cpu_base
+cannot be NULL in the code path", so it is safe to limit this check to SMP
+configurations only.
+
+Add the missing bracket to the if statement and hide `migration_base'
+behind CONFIG_SMP bars.
+
+[ tglx: Mark the functions inline ... ]
+
+Fixes: 68b2c8c1e4210 ("hrtimer: Don't take expiry_lock when timer is currently migrated")
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+Link: https://lkml.kernel.org/r/20190904145527.eah7z56ntwobqm6j@linutronix.de
+Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
+[bigeasy: port back to RT]
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+---
+ kernel/time/hrtimer.c | 12 +++++++++++-
+ 1 file changed, 11 insertions(+), 1 deletion(-)
+
+diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
+index 3f9d156c36f1..0f841f18c363 100644
+--- a/kernel/time/hrtimer.c
++++ b/kernel/time/hrtimer.c
+@@ -150,6 +150,11 @@ static struct hrtimer_cpu_base migration_cpu_base = {
+ 
+ #define migration_base	migration_cpu_base.clock_base[0]
+ 
++static inline bool is_migration_base(struct hrtimer_clock_base *base)
++{
++	return base == &migration_base;
++}
++
+ /*
+  * We are using hashed locking: holding per_cpu(hrtimer_bases)[n].lock
+  * means that all timers which are tied to this base via timer->base are
+@@ -274,6 +279,11 @@ switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base,
+ 
+ #else /* CONFIG_SMP */
+ 
++static inline bool is_migration_base(struct hrtimer_clock_base *base)
++{
++	return false;
++}
++
+ static inline struct hrtimer_clock_base *
+ lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
+ {
+@@ -961,7 +971,7 @@ void hrtimer_grab_expiry_lock(const struct hrtimer *timer)
+ {
+ 	struct hrtimer_clock_base *base = READ_ONCE(timer->base);
+ 
+-	if (timer->is_soft && base != &migration_base) {
++	if (timer->is_soft && is_migration_base(base)) {
+ 		spin_lock(&base->cpu_base->softirq_expiry_lock);
+ 		spin_unlock(&base->cpu_base->softirq_expiry_lock);
+ 	}