1 files changed, 0 insertions, 89 deletions
diff --git a/debian/patches-rt/hotplug-light-get-online-cpus.patch b/debian/patches-rt/hotplug-light-get-online-cpus.patch
deleted file mode 100644
index 71ad8e5eb..000000000
--- a/debian/patches-rt/hotplug-light-get-online-cpus.patch
+++ /dev/null
@@ -1,89 +0,0 @@
-Subject: hotplug: Lightweight get online cpus
-From: Thomas Gleixner <tglx@linutronix.de>
-Date: Wed, 15 Jun 2011 12:36:06 +0200
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.2/older/patches-5.2.17-rt9.tar.xz
-
-get_online_cpus() is a heavy weight function which involves a global
-mutex. migrate_disable() wants a simpler construct which prevents only
-a CPU from going doing while a task is in a migrate disabled section.
-
-Implement a per cpu lockless mechanism, which serializes only in the
-real unplug case on a global mutex. That serialization affects only
-tasks on the cpu which should be brought down.
-
-Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
----
- include/linux/cpu.h |    5 +++++
- kernel/cpu.c        |   15 +++++++++++++++
- kernel/sched/core.c |    3 +++
- 3 files changed, 23 insertions(+)
-
---- a/include/linux/cpu.h
-+++ b/include/linux/cpu.h
-@@ -113,6 +113,8 @@ extern void cpu_hotplug_disable(void);
- extern void cpu_hotplug_enable(void);
- void clear_tasks_mm_cpumask(int cpu);
- int cpu_down(unsigned int cpu);
-+extern void pin_current_cpu(void);
-+extern void unpin_current_cpu(void);
- 
- #else /* CONFIG_HOTPLUG_CPU */
- 
-@@ -124,6 +126,9 @@ static inline int  cpus_read_trylock(voi
- static inline void lockdep_assert_cpus_held(void) { }
- static inline void cpu_hotplug_disable(void) { }
- static inline void cpu_hotplug_enable(void) { }
-+static inline void pin_current_cpu(void) { }
-+static inline void unpin_current_cpu(void) { }
-+
- #endif	/* !CONFIG_HOTPLUG_CPU */
- 
- /* Wrappers which go away once all code is converted */
---- a/kernel/cpu.c
-+++ b/kernel/cpu.c
-@@ -282,6 +282,21 @@ static int cpu_hotplug_disabled;
- 
- #ifdef CONFIG_HOTPLUG_CPU
- 
-+/**
-+ * pin_current_cpu - Prevent the current cpu from being unplugged
-+ */
-+void pin_current_cpu(void)
-+{
-+
-+}
-+
-+/**
-+ * unpin_current_cpu - Allow unplug of current cpu
-+ */
-+void unpin_current_cpu(void)
-+{
-+}
-+
- DEFINE_STATIC_PERCPU_RWSEM(cpu_hotplug_lock);
- 
- void cpus_read_lock(void)
---- a/kernel/sched/core.c
-+++ b/kernel/sched/core.c
-@@ -7214,6 +7214,7 @@ void migrate_disable(void)
- 	}
- 
- 	preempt_disable();
-+	pin_current_cpu();
- 
- 	migrate_disable_update_cpus_allowed(p);
- 	p->migrate_disable = 1;
-@@ -7279,11 +7280,13 @@ void migrate_enable(void)
- 			arg.task = p;
- 			arg.dest_cpu = dest_cpu;
- 
-+			unpin_current_cpu();
- 			preempt_enable();
- 			stop_one_cpu(task_cpu(p), migration_cpu_stop, &arg);
- 			return;
- 		}
- 	}
-+	unpin_current_cpu();
- 	preempt_enable();
- }
- EXPORT_SYMBOL(migrate_enable);