1 files changed, 52 insertions, 0 deletions

diff --git a/kernel/trace/trace_events.h b/kernel/trace/trace_events.h
new file mode 100644
index 000000000000..39342f86db27
--- /dev/null
+++ b/kernel/trace/trace_events.h
@@ -0,0 +1,52 @@
+#ifndef _LINUX_KERNEL_TRACE_EVENTS_H
+#define _LINUX_KERNEL_TRACE_EVENTS_H
+
+#include <linux/ftrace.h>
+#include "trace.h"
+
+struct ftrace_event_call {
+        char            *name;
+        int             enabled;
+        int             (*regfunc)(void);
+        void            (*unregfunc)(void);
+};
+
+
+#undef TPFMT
+#define TPFMT(fmt, args...)     fmt "\n", ##args
+
+#undef DEFINE_TRACE_FMT
+#define DEFINE_TRACE_FMT(call, proto, args, fmt)                        \
+static void ftrace_event_##call(proto)                                  \
+{                                                                       \
+        event_trace_printk(_RET_IP_, "(" #call ") " fmt);               \
+}                                                                       \
+                                                                        \
+static int ftrace_reg_event_##call(void)                                \
+{                                                                       \
+        int ret;                                                        \
+                                                                        \
+        ret = register_trace_##call(ftrace_event_##call);               \
+        if (!ret)                                                       \
+                pr_info("event trace: Could not activate trace point "  \
+                        "probe to " #call);                             \
+        return ret;                                                     \
+}                                                                       \
+                                                                        \
+static void ftrace_unreg_event_##call(void)                             \
+{                                                                       \
+        unregister_trace_##call(ftrace_event_##call);                   \
+}                                                                       \
+                                                                        \
+static struct ftrace_event_call __used                                  \
+__attribute__((section("_ftrace_events"))) event_##call = {             \
+        .name                   = #call,                                \
+        .regfunc                = ftrace_reg_event_##call,              \
+        .unregfunc              = ftrace_unreg_event_##call,            \
+}
+
+void event_trace_printk(unsigned long ip, const char *fmt, ...);
+extern unsigned long __start_ftrace_events[];
+extern unsigned long __stop_ftrace_events[];
+
+#endif /* _LINUX_KERNEL_TRACE_EVENTS_H */