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, 174 insertions, 0 deletions

diff --git a/kernel/include/linux/irqflags.h b/kernel/include/linux/irqflags.h
new file mode 100644
index 000000000..9b77034f7
--- /dev/null
+++ b/kernel/include/linux/irqflags.h
@@ -0,0 +1,174 @@
+/*
+ * include/linux/irqflags.h
+ *
+ * IRQ flags tracing: follow the state of the hardirq and softirq flags and
+ * provide callbacks for transitions between ON and OFF states.
+ *
+ * This file gets included from lowlevel asm headers too, to provide
+ * wrapped versions of the local_irq_*() APIs, based on the
+ * raw_local_irq_*() macros from the lowlevel headers.
+ */
+#ifndef _LINUX_TRACE_IRQFLAGS_H
+#define _LINUX_TRACE_IRQFLAGS_H
+
+#include <linux/typecheck.h>
+#include <asm/irqflags.h>
+
+#ifdef CONFIG_TRACE_IRQFLAGS
+  extern void trace_softirqs_on(unsigned long ip);
+  extern void trace_softirqs_off(unsigned long ip);
+  extern void trace_hardirqs_on(void);
+  extern void trace_hardirqs_off(void);
+# define trace_hardirq_context(p)	((p)->hardirq_context)
+# define trace_softirq_context(p)	((p)->softirq_context)
+# define trace_hardirqs_enabled(p)	((p)->hardirqs_enabled)
+# define trace_softirqs_enabled(p)	((p)->softirqs_enabled)
+# define trace_hardirq_enter()	do { current->hardirq_context++; } while (0)
+# define trace_hardirq_exit()	do { current->hardirq_context--; } while (0)
+# define INIT_TRACE_IRQFLAGS	.softirqs_enabled = 1,
+#else
+# define trace_hardirqs_on()		do { } while (0)
+# define trace_hardirqs_off()		do { } while (0)
+# define trace_softirqs_on(ip)		do { } while (0)
+# define trace_softirqs_off(ip)		do { } while (0)
+# define trace_hardirq_context(p)	0
+# define trace_softirq_context(p)	0
+# define trace_hardirqs_enabled(p)	0
+# define trace_softirqs_enabled(p)	0
+# define trace_hardirq_enter()		do { } while (0)
+# define trace_hardirq_exit()		do { } while (0)
+# define INIT_TRACE_IRQFLAGS
+#endif
+
+#if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT_FULL)
+# define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
+# define lockdep_softirq_exit()	 do { current->softirq_context--; } while (0)
+#else
+# define lockdep_softirq_enter()	do { } while (0)
+# define lockdep_softirq_exit()		do { } while (0)
+#endif
+
+#if defined(CONFIG_IRQSOFF_TRACER) || \
+	defined(CONFIG_PREEMPT_TRACER)
+ extern void stop_critical_timings(void);
+ extern void start_critical_timings(void);
+#else
+# define stop_critical_timings() do { } while (0)
+# define start_critical_timings() do { } while (0)
+#endif
+
+/*
+ * Wrap the arch provided IRQ routines to provide appropriate checks.
+ */
+#define raw_local_irq_disable()		arch_local_irq_disable()
+#define raw_local_irq_enable()		arch_local_irq_enable()
+#define raw_local_irq_save(flags)			\
+	do {						\
+		typecheck(unsigned long, flags);	\
+		flags = arch_local_irq_save();		\
+	} while (0)
+#define raw_local_irq_restore(flags)			\
+	do {						\
+		typecheck(unsigned long, flags);	\
+		arch_local_irq_restore(flags);		\
+	} while (0)
+#define raw_local_save_flags(flags)			\
+	do {						\
+		typecheck(unsigned long, flags);	\
+		flags = arch_local_save_flags();	\
+	} while (0)
+#define raw_irqs_disabled_flags(flags)			\
+	({						\
+		typecheck(unsigned long, flags);	\
+		arch_irqs_disabled_flags(flags);	\
+	})
+#define raw_irqs_disabled()		(arch_irqs_disabled())
+#define raw_safe_halt()			arch_safe_halt()
+
+/*
+ * The local_irq_*() APIs are equal to the raw_local_irq*()
+ * if !TRACE_IRQFLAGS.
+ */
+#ifdef CONFIG_TRACE_IRQFLAGS
+#define local_irq_enable() \
+	do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
+#define local_irq_disable() \
+	do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
+#define local_irq_save(flags)				\
+	do {						\
+		raw_local_irq_save(flags);		\
+		trace_hardirqs_off();			\
+	} while (0)
+
+
+#define local_irq_restore(flags)			\
+	do {						\
+		if (raw_irqs_disabled_flags(flags)) {	\
+			raw_local_irq_restore(flags);	\
+			trace_hardirqs_off();		\
+		} else {				\
+			trace_hardirqs_on();		\
+			raw_local_irq_restore(flags);	\
+		}					\
+	} while (0)
+
+#define safe_halt()				\
+	do {					\
+		trace_hardirqs_on();		\
+		raw_safe_halt();		\
+	} while (0)
+
+
+#else /* !CONFIG_TRACE_IRQFLAGS */
+
+#define local_irq_enable()	do { raw_local_irq_enable(); } while (0)
+#define local_irq_disable()	do { raw_local_irq_disable(); } while (0)
+#define local_irq_save(flags)					\
+	do {							\
+		raw_local_irq_save(flags);			\
+	} while (0)
+#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
+#define safe_halt()		do { raw_safe_halt(); } while (0)
+
+#endif /* CONFIG_TRACE_IRQFLAGS */
+
+#define local_save_flags(flags)	raw_local_save_flags(flags)
+
+/*
+ * Some architectures don't define arch_irqs_disabled(), so even if either
+ * definition would be fine we need to use different ones for the time being
+ * to avoid build issues.
+ */
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
+#define irqs_disabled()					\
+	({						\
+		unsigned long _flags;			\
+		raw_local_save_flags(_flags);		\
+		raw_irqs_disabled_flags(_flags);	\
+	})
+#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
+#define irqs_disabled()	raw_irqs_disabled()
+#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
+
+#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
+
+/*
+ * local_irq* variants depending on RT/!RT
+ */
+#ifdef CONFIG_PREEMPT_RT_FULL
+# define local_irq_disable_nort()	do { } while (0)
+# define local_irq_enable_nort()	do { } while (0)
+# define local_irq_save_nort(flags)	local_save_flags(flags)
+# define local_irq_restore_nort(flags)	(void)(flags)
+# define local_irq_disable_rt()		local_irq_disable()
+# define local_irq_enable_rt()		local_irq_enable()
+#else
+# define local_irq_disable_nort()	local_irq_disable()
+# define local_irq_enable_nort()	local_irq_enable()
+# define local_irq_save_nort(flags)	local_irq_save(flags)
+# define local_irq_restore_nort(flags)	local_irq_restore(flags)
+# define local_irq_disable_rt()		do { } while (0)
+# define local_irq_enable_rt()		do { } while (0)
+#endif
+
+#endif