kvm: external module: backward compatibility for markers

Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 119 insertions, 0 deletions

diff --git a/kernel/include-compat/linux/marker.h b/kernel/include-compat/linux/marker.h
new file mode 100644
index 00000000..ceef04f2
--- /dev/null
+++ b/kernel/include-compat/linux/marker.h
@@ -0,0 +1,119 @@
+/*
+ * Alternative file to satisfy #include <linux/marker.h> for older kernels.
+ */
+#ifndef _LINUX_MARKER_H
+#define _LINUX_MARKER_H
+
+/*
+ * Code markup for dynamic and static tracing.
+ *
+ * See Documentation/marker.txt.
+ *
+ * (C) Copyright 2006 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#include <linux/types.h>
+
+struct module;
+struct marker;
+
+/**
+ * marker_probe_func - Type of a marker probe function
+ * @probe_private: probe private data
+ * @call_private: call site private data
+ * @fmt: format string
+ * @args: variable argument list pointer. Use a pointer to overcome C's
+ *        inability to pass this around as a pointer in a portable manner in
+ *        the callee otherwise.
+ *
+ * Type of marker probe functions. They receive the mdata and need to parse the
+ * format string to recover the variable argument list.
+ */
+typedef void marker_probe_func(void *probe_private, void *call_private,
+		const char *fmt, va_list *args);
+
+struct marker_probe_closure {
+	marker_probe_func *func;	/* Callback */
+	void *probe_private;		/* Private probe data */
+};
+
+struct marker {
+	const char *name;	/* Marker name */
+	const char *format;	/* Marker format string, describing the
+				 * variable argument list.
+				 */
+	char state;		/* Marker state. */
+	char ptype;		/* probe type : 0 : single, 1 : multi */
+	void (*call)(const struct marker *mdata,	/* Probe wrapper */
+		void *call_private, const char *fmt, ...);
+	struct marker_probe_closure single;
+	struct marker_probe_closure *multi;
+} __attribute__((aligned(8)));
+
+#define __trace_mark(name, call_private, format, args...) \
+		__mark_check_format(format, ## args)
+static inline void marker_update_probe_range(struct marker *begin,
+	struct marker *end)
+{ }
+
+/**
+ * trace_mark - Marker
+ * @name: marker name, not quoted.
+ * @format: format string
+ * @args...: variable argument list
+ *
+ * Places a marker.
+ */
+#define trace_mark(name, format, args...) \
+	__trace_mark(name, NULL, format, ## args)
+
+/**
+ * MARK_NOARGS - Format string for a marker with no argument.
+ */
+#define MARK_NOARGS " "
+
+/* To be used for string format validity checking with gcc */
+static inline void __attribute__((format(printf,1,2))) 
+___mark_check_format(const char *fmt, ...)
+{
+}
+
+#define __mark_check_format(format, args...)				\
+	do {								\
+		if (0)							\
+			___mark_check_format(format, ## args);		\
+	} while (0)
+
+extern marker_probe_func __mark_empty_function;
+
+extern void marker_probe_cb(const struct marker *mdata,
+	void *call_private, const char *fmt, ...);
+extern void marker_probe_cb_noarg(const struct marker *mdata,
+	void *call_private, const char *fmt, ...);
+
+/*
+ * Connect a probe to a marker.
+ * private data pointer must be a valid allocated memory address, or NULL.
+ */
+extern int marker_probe_register(const char *name, const char *format,
+				marker_probe_func *probe, void *probe_private);
+
+/*
+ * Returns the private data given to marker_probe_register.
+ */
+extern int marker_probe_unregister(const char *name,
+	marker_probe_func *probe, void *probe_private);
+/*
+ * Unregister a marker by providing the registered private data.
+ */
+extern int marker_probe_unregister_private_data(marker_probe_func *probe,
+	void *probe_private);
+
+extern void *marker_get_private_data(const char *name, marker_probe_func *probe,
+	int num);
+
+#endif
+