Commit 0f4fc29d authored by Steven Rostedt's avatar Steven Rostedt Committed by Frederic Weisbecker
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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: default avatarSteven Rostedt <>
Signed-off-by: default avatarFrederic Weisbecker <>
parent 62ba180e
......@@ -20,6 +20,9 @@ const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
unsigned long flags,
const struct trace_print_flags *flag_array);
const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
const struct trace_print_flags *symbol_array);
* The trace entry - the most basic unit of tracing. This is what
* is printed in the end as a single line in the trace output, such as:
......@@ -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); \
#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
enum print_line_t \
......@@ -251,6 +251,31 @@ ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
return p->buffer;
const char *
ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
const struct trace_print_flags *symbol_array)
int i;
for (i = 0; symbol_array[i].name; i++) {
if (val != symbol_array[i].mask)
trace_seq_puts(p, symbol_array[i].name);
if (!p->len)
trace_seq_printf(p, "0x%lx", val);
trace_seq_putc(p, 0);
return p->buffer;
static inline const char *kretprobed(const char *name)
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