Merge branch 'upstream-merged'

1 files changed, 72 insertions, 0 deletions

diff --git a/libdde_linux26/contrib/include/linux/stop_machine.h b/libdde_linux26/contrib/include/linux/stop_machine.h
new file mode 100644
index 00000000..baba3a23
--- /dev/null
+++ b/libdde_linux26/contrib/include/linux/stop_machine.h
@@ -0,0 +1,72 @@
+#ifndef _LINUX_STOP_MACHINE
+#define _LINUX_STOP_MACHINE
+/* "Bogolock": stop the entire machine, disable interrupts.  This is a
+   very heavy lock, which is equivalent to grabbing every spinlock
+   (and more).  So the "read" side to such a lock is anything which
+   disables preeempt. */
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <asm/system.h>
+
+#if defined(CONFIG_STOP_MACHINE) && defined(CONFIG_SMP)
+
+/**
+ * stop_machine: freeze the machine on all CPUs and run this function
+ * @fn: the function to run
+ * @data: the data ptr for the @fn()
+ * @cpus: the cpus to run the @fn() on (NULL = any online cpu)
+ *
+ * Description: This causes a thread to be scheduled on every cpu,
+ * each of which disables interrupts.  The result is that noone is
+ * holding a spinlock or inside any other preempt-disabled region when
+ * @fn() runs.
+ *
+ * This can be thought of as a very heavy write lock, equivalent to
+ * grabbing every spinlock in the kernel. */
+int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
+
+/**
+ * __stop_machine: freeze the machine on all CPUs and run this function
+ * @fn: the function to run
+ * @data: the data ptr for the @fn
+ * @cpus: the cpus to run the @fn() on (NULL = any online cpu)
+ *
+ * Description: This is a special version of the above, which assumes cpus
+ * won't come or go while it's being called.  Used by hotplug cpu.
+ */
+int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
+
+/**
+ * stop_machine_create: create all stop_machine threads
+ *
+ * Description: This causes all stop_machine threads to be created before
+ * stop_machine actually gets called. This can be used by subsystems that
+ * need a non failing stop_machine infrastructure.
+ */
+int stop_machine_create(void);
+
+/**
+ * stop_machine_destroy: destroy all stop_machine threads
+ *
+ * Description: This causes all stop_machine threads which were created with
+ * stop_machine_create to be destroyed again.
+ */
+void stop_machine_destroy(void);
+
+#else
+
+static inline int stop_machine(int (*fn)(void *), void *data,
+			       const struct cpumask *cpus)
+{
+	int ret;
+	local_irq_disable();
+	ret = fn(data);
+	local_irq_enable();
+	return ret;
+}
+
+static inline int stop_machine_create(void) { return 0; }
+static inline void stop_machine_destroy(void) { }
+
+#endif /* CONFIG_SMP */
+#endif /* _LINUX_STOP_MACHINE */