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-rw-r--r--kernel/include/linux/hardirq.h82
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 */