1 files changed, 0 insertions, 109 deletions
diff --git a/debian/patches-rt/cpu-hotplug--Implement-CPU-pinning.patch b/debian/patches-rt/cpu-hotplug--Implement-CPU-pinning.patch
deleted file mode 100644
index 49230a771..000000000
--- a/debian/patches-rt/cpu-hotplug--Implement-CPU-pinning.patch
+++ /dev/null
@@ -1,109 +0,0 @@
-Subject: cpu/hotplug: Implement CPU pinning
-From: Thomas Gleixner <tglx@linutronix.de>
-Date: Wed, 19 Jul 2017 17:31:20 +0200
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.2/older/patches-5.2.17-rt9.tar.xz
-
-Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
----
- include/linux/sched.h |    1 +
- kernel/cpu.c          |   38 ++++++++++++++++++++++++++++++++++++++
- 2 files changed, 39 insertions(+)
-
---- a/include/linux/sched.h
-+++ b/include/linux/sched.h
-@@ -662,6 +662,7 @@ struct task_struct {
- #if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE)
- 	int				migrate_disable;
- 	int				migrate_disable_update;
-+	int				pinned_on_cpu;
- # ifdef CONFIG_SCHED_DEBUG
- 	int				migrate_disable_atomic;
- # endif
---- a/kernel/cpu.c
-+++ b/kernel/cpu.c
-@@ -76,6 +76,11 @@ static DEFINE_PER_CPU(struct cpuhp_cpu_s
- 	.fail = CPUHP_INVALID,
- };
- 
-+#ifdef CONFIG_HOTPLUG_CPU
-+static DEFINE_PER_CPU(struct rt_rw_lock, cpuhp_pin_lock) = \
-+	__RWLOCK_RT_INITIALIZER(cpuhp_pin_lock);
-+#endif
-+
- #if defined(CONFIG_LOCKDEP) && defined(CONFIG_SMP)
- static struct lockdep_map cpuhp_state_up_map =
- 	STATIC_LOCKDEP_MAP_INIT("cpuhp_state-up", &cpuhp_state_up_map);
-@@ -287,7 +292,28 @@ static int cpu_hotplug_disabled;
-  */
- void pin_current_cpu(void)
- {
-+	struct rt_rw_lock *cpuhp_pin;
-+	unsigned int cpu;
-+	int ret;
-+
-+again:
-+	cpuhp_pin = this_cpu_ptr(&cpuhp_pin_lock);
-+	ret = __read_rt_trylock(cpuhp_pin);
-+	if (ret) {
-+		current->pinned_on_cpu = smp_processor_id();
-+		return;
-+	}
-+	cpu = smp_processor_id();
-+	preempt_enable();
-+
-+	__read_rt_lock(cpuhp_pin);
- 
-+	preempt_disable();
-+	if (cpu != smp_processor_id()) {
-+		__read_rt_unlock(cpuhp_pin);
-+		goto again;
-+	}
-+	current->pinned_on_cpu = cpu;
- }
- 
- /**
-@@ -295,6 +321,13 @@ void pin_current_cpu(void)
-  */
- void unpin_current_cpu(void)
- {
-+	struct rt_rw_lock *cpuhp_pin = this_cpu_ptr(&cpuhp_pin_lock);
-+
-+	if (WARN_ON(current->pinned_on_cpu != smp_processor_id()))
-+		cpuhp_pin = per_cpu_ptr(&cpuhp_pin_lock, current->pinned_on_cpu);
-+
-+	current->pinned_on_cpu = -1;
-+	__read_rt_unlock(cpuhp_pin);
- }
- 
- DEFINE_STATIC_PERCPU_RWSEM(cpu_hotplug_lock);
-@@ -885,6 +918,7 @@ static int take_cpu_down(void *_param)
- 
- static int takedown_cpu(unsigned int cpu)
- {
-+	struct rt_rw_lock *cpuhp_pin = per_cpu_ptr(&cpuhp_pin_lock, cpu);
- 	struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu);
- 	int err;
- 
-@@ -897,11 +931,14 @@ static int takedown_cpu(unsigned int cpu
- 	 */
- 	irq_lock_sparse();
- 
-+	__write_rt_lock(cpuhp_pin);
-+
- 	/*
- 	 * So now all preempt/rcu users must observe !cpu_active().
- 	 */
- 	err = stop_machine_cpuslocked(take_cpu_down, NULL, cpumask_of(cpu));
- 	if (err) {
-+		__write_rt_unlock(cpuhp_pin);
- 		/* CPU refused to die */
- 		irq_unlock_sparse();
- 		/* Unpark the hotplug thread so we can rollback there */
-@@ -920,6 +957,7 @@ static int takedown_cpu(unsigned int cpu
- 	wait_for_ap_thread(st, false);
- 	BUG_ON(st->state != CPUHP_AP_IDLE_DEAD);
- 
-+	__write_rt_unlock(cpuhp_pin);
- 	/* Interrupts are moved away from the dying cpu, reenable alloc/free */
- 	irq_unlock_sparse();
-