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, 82 insertions, 0 deletions

diff --git a/kernel/include/linux/hardirq.h b/kernel/include/linux/hardirq.h
new file mode 100644
index 000000000..f4af03404
--- /dev/null
+++ b/kernel/include/linux/hardirq.h
@@ -0,0 +1,82 @@
+#ifndef LINUX_HARDIRQ_H
+#define LINUX_HARDIRQ_H
+
+#include <linux/preempt_mask.h>
+#include <linux/lockdep.h>
+#include <linux/ftrace_irq.h>
+#include <linux/vtime.h>
+#include <asm/hardirq.h>
+
+
+extern void synchronize_irq(unsigned int irq);
+extern bool synchronize_hardirq(unsigned int irq);
+
+#if defined(CONFIG_TINY_RCU)
+
+static inline void rcu_nmi_enter(void)
+{
+}
+
+static inline void rcu_nmi_exit(void)
+{
+}
+
+#else
+extern void rcu_nmi_enter(void);
+extern void rcu_nmi_exit(void);
+#endif
+
+/*
+ * It is safe to do non-atomic ops on ->hardirq_context,
+ * because NMI handlers may not preempt and the ops are
+ * always balanced, so the interrupted value of ->hardirq_context
+ * will always be restored.
+ */
+#define __irq_enter()					\
+	do {						\
+		account_irq_enter_time(current);	\
+		preempt_count_add(HARDIRQ_OFFSET);	\
+		trace_hardirq_enter();			\
+	} while (0)
+
+/*
+ * Enter irq context (on NO_HZ, update jiffies):
+ */
+extern void irq_enter(void);
+
+/*
+ * Exit irq context without processing softirqs:
+ */
+#define __irq_exit()					\
+	do {						\
+		trace_hardirq_exit();			\
+		account_irq_exit_time(current);		\
+		preempt_count_sub(HARDIRQ_OFFSET);	\
+	} while (0)
+
+/*
+ * Exit irq context and process softirqs if needed:
+ */
+extern void irq_exit(void);
+
+#define nmi_enter()						\
+	do {							\
+		lockdep_off();					\
+		ftrace_nmi_enter();				\
+		BUG_ON(in_nmi());				\
+		preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET);	\
+		rcu_nmi_enter();				\
+		trace_hardirq_enter();				\
+	} while (0)
+
+#define nmi_exit()						\
+	do {							\
+		trace_hardirq_exit();				\
+		rcu_nmi_exit();					\
+		BUG_ON(!in_nmi());				\
+		preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET);	\
+		ftrace_nmi_exit();				\
+		lockdep_on();					\
+	} while (0)
+
+#endif /* LINUX_HARDIRQ_H */