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, 98 insertions, 0 deletions

diff --git a/kernel/include/linux/kernel_stat.h b/kernel/include/linux/kernel_stat.h
new file mode 100644
index 000000000..25a822f6f
--- /dev/null
+++ b/kernel/include/linux/kernel_stat.h
@@ -0,0 +1,98 @@
+#ifndef _LINUX_KERNEL_STAT_H
+#define _LINUX_KERNEL_STAT_H
+
+#include <linux/smp.h>
+#include <linux/threads.h>
+#include <linux/percpu.h>
+#include <linux/cpumask.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/vtime.h>
+#include <asm/irq.h>
+#include <linux/cputime.h>
+
+/*
+ * 'kernel_stat.h' contains the definitions needed for doing
+ * some kernel statistics (CPU usage, context switches ...),
+ * used by rstatd/perfmeter
+ */
+
+enum cpu_usage_stat {
+	CPUTIME_USER,
+	CPUTIME_NICE,
+	CPUTIME_SYSTEM,
+	CPUTIME_SOFTIRQ,
+	CPUTIME_IRQ,
+	CPUTIME_IDLE,
+	CPUTIME_IOWAIT,
+	CPUTIME_STEAL,
+	CPUTIME_GUEST,
+	CPUTIME_GUEST_NICE,
+	NR_STATS,
+};
+
+struct kernel_cpustat {
+	u64 cpustat[NR_STATS];
+};
+
+struct kernel_stat {
+	unsigned long irqs_sum;
+	unsigned int softirqs[NR_SOFTIRQS];
+};
+
+DECLARE_PER_CPU(struct kernel_stat, kstat);
+DECLARE_PER_CPU(struct kernel_cpustat, kernel_cpustat);
+
+/* Must have preemption disabled for this to be meaningful. */
+#define kstat_this_cpu this_cpu_ptr(&kstat)
+#define kcpustat_this_cpu this_cpu_ptr(&kernel_cpustat)
+#define kstat_cpu(cpu) per_cpu(kstat, cpu)
+#define kcpustat_cpu(cpu) per_cpu(kernel_cpustat, cpu)
+
+extern unsigned long long nr_context_switches(void);
+
+extern unsigned int kstat_irqs_cpu(unsigned int irq, int cpu);
+extern void kstat_incr_irq_this_cpu(unsigned int irq);
+
+static inline void kstat_incr_softirqs_this_cpu(unsigned int irq)
+{
+	__this_cpu_inc(kstat.softirqs[irq]);
+}
+
+static inline unsigned int kstat_softirqs_cpu(unsigned int irq, int cpu)
+{
+       return kstat_cpu(cpu).softirqs[irq];
+}
+
+/*
+ * Number of interrupts per specific IRQ source, since bootup
+ */
+extern unsigned int kstat_irqs(unsigned int irq);
+extern unsigned int kstat_irqs_usr(unsigned int irq);
+
+/*
+ * Number of interrupts per cpu, since bootup
+ */
+static inline unsigned int kstat_cpu_irqs_sum(unsigned int cpu)
+{
+	return kstat_cpu(cpu).irqs_sum;
+}
+
+extern void account_user_time(struct task_struct *, cputime_t, cputime_t);
+extern void account_system_time(struct task_struct *, int, cputime_t, cputime_t);
+extern void account_steal_time(cputime_t);
+extern void account_idle_time(cputime_t);
+
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+static inline void account_process_tick(struct task_struct *tsk, int user)
+{
+	vtime_account_user(tsk);
+}
+#else
+extern void account_process_tick(struct task_struct *, int user);
+#endif
+
+extern void account_steal_ticks(unsigned long ticks);
+extern void account_idle_ticks(unsigned long ticks);
+
+#endif /* _LINUX_KERNEL_STAT_H */