tracing: add __print_symbolic to trace events
This patch adds __print_symbolic which is similar to __print_flags but
works for an enumeration type instead. That is, there is only a one to one
mapping between the values and the symbols. When a match is made, then
it is printed, otherwise the hex value is outputed.
[ Impact: add interface for showing symbol names in events ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 22c9471..87fc227 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -130,6 +130,14 @@
ftrace_print_flags_seq(p, delim, flag, flags); \
})
+#undef __print_symbolic
+#define __print_symbolic(value, symbol_array...) \
+ ({ \
+ static const struct trace_print_flags symbols[] = \
+ { symbol_array, { -1, NULL }}; \
+ ftrace_print_symbols_seq(p, value, symbols); \
+ })
+
#undef TRACE_EVENT
#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
enum print_line_t \
