1 files changed, 86 insertions, 0 deletions
diff --git a/recipes-kernel/linux/linux-toradex-rt-4.9-2.3.x/004.patch b/recipes-kernel/linux/linux-toradex-rt-4.9-2.3.x/004.patch
new file mode 100644
index 0000000..bc2c859
--- /dev/null
+++ b/recipes-kernel/linux/linux-toradex-rt-4.9-2.3.x/004.patch
@@ -0,0 +1,86 @@
+--- b/kernel/stop_machine.c
++++ a/kernel/stop_machine.c
+@@ -36,7 +36,7 @@
+ struct cpu_stopper {
+ 	struct task_struct	*thread;
+ 
++	spinlock_t		lock;
+-	raw_spinlock_t		lock;
+ 	bool			enabled;	/* is this stopper enabled? */
+ 	struct list_head	works;		/* list of pending works */
+ 
+@@ -78,13 +78,13 @@
+ 	unsigned long flags;
+ 	bool enabled;
+ 
++	spin_lock_irqsave(&stopper->lock, flags);
+-	raw_spin_lock_irqsave(&stopper->lock, flags);
+ 	enabled = stopper->enabled;
+ 	if (enabled)
+ 		__cpu_stop_queue_work(stopper, work);
+ 	else if (work->done)
+ 		cpu_stop_signal_done(work->done);
++	spin_unlock_irqrestore(&stopper->lock, flags);
+-	raw_spin_unlock_irqrestore(&stopper->lock, flags);
+ 
+ 	return enabled;
+ }
+@@ -231,8 +231,8 @@
+ 	struct cpu_stopper *stopper2 = per_cpu_ptr(&cpu_stopper, cpu2);
+ 	int err;
+ retry:
++	spin_lock_irq(&stopper1->lock);
++	spin_lock_nested(&stopper2->lock, SINGLE_DEPTH_NESTING);
+-	raw_spin_lock_irq(&stopper1->lock);
+-	raw_spin_lock_nested(&stopper2->lock, SINGLE_DEPTH_NESTING);
+ 
+ 	err = -ENOENT;
+ 	if (!stopper1->enabled || !stopper2->enabled)
+@@ -255,8 +255,8 @@
+ 	__cpu_stop_queue_work(stopper1, work1);
+ 	__cpu_stop_queue_work(stopper2, work2);
+ unlock:
++	spin_unlock(&stopper2->lock);
++	spin_unlock_irq(&stopper1->lock);
+-	raw_spin_unlock(&stopper2->lock);
+-	raw_spin_unlock_irq(&stopper1->lock);
+ 
+ 	if (unlikely(err == -EDEADLK)) {
+ 		while (stop_cpus_in_progress)
+@@ -448,9 +448,9 @@
+ 	unsigned long flags;
+ 	int run;
+ 
++	spin_lock_irqsave(&stopper->lock, flags);
+-	raw_spin_lock_irqsave(&stopper->lock, flags);
+ 	run = !list_empty(&stopper->works);
++	spin_unlock_irqrestore(&stopper->lock, flags);
+-	raw_spin_unlock_irqrestore(&stopper->lock, flags);
+ 	return run;
+ }
+ 
+@@ -461,13 +461,13 @@
+ 
+ repeat:
+ 	work = NULL;
++	spin_lock_irq(&stopper->lock);
+-	raw_spin_lock_irq(&stopper->lock);
+ 	if (!list_empty(&stopper->works)) {
+ 		work = list_first_entry(&stopper->works,
+ 					struct cpu_stop_work, list);
+ 		list_del_init(&work->list);
+ 	}
++	spin_unlock_irq(&stopper->lock);
+-	raw_spin_unlock_irq(&stopper->lock);
+ 
+ 	if (work) {
+ 		cpu_stop_fn_t fn = work->fn;
+@@ -541,7 +541,7 @@
+ 	for_each_possible_cpu(cpu) {
+ 		struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
+ 
++		spin_lock_init(&stopper->lock);
+-		raw_spin_lock_init(&stopper->lock);
+ 		INIT_LIST_HEAD(&stopper->works);
+ 	}
+