Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-prima2/hotplug.c b/kernel/arch/arm/mach-prima2/hotplug.c
new file mode 100644
index 000000000..0ab2f8bae
--- /dev/null
+++ b/kernel/arch/arm/mach-prima2/hotplug.c
@@ -0,0 +1,38 @@
+/*
+ * CPU hotplug support for CSR Marco dual-core SMP SoCs
+ *
+ * Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/smp.h>
+
+#include <asm/smp_plat.h>
+
+static inline void platform_do_lowpower(unsigned int cpu)
+{
+	/* we put the platform to just WFI */
+	for (;;) {
+		__asm__ __volatile__("dsb\n\t" "wfi\n\t"
+			: : : "memory");
+		if (pen_release == cpu_logical_map(cpu)) {
+			/*
+			 * OK, proper wakeup, we're done
+			 */
+			break;
+		}
+	}
+}
+
+/*
+ * platform-specific code to shutdown a CPU
+ *
+ * Called with IRQs disabled
+ */
+void __ref sirfsoc_cpu_die(unsigned int cpu)
+{
+	platform_do_lowpower(cpu);
+}