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tracing: add __print_symbolic to trace events

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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>
This commit is contained in:
Steven Rostedt 2009-05-20 19:21:47 -04:00 committed by Frederic Weisbecker
parent 62ba180e80
commit 0f4fc29dd6
3 changed files with 36 additions and 0 deletions
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3
include/linux/ftrace_event.h
View File

@ -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:

8
include/trace/ftrace.h
View File

@ -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 \

25
kernel/trace/trace_output.c
View File

@ -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;
trace_seq_init(p);
for (i = 0; symbol_array[i].name; i++) {
if (val != symbol_array[i].mask)
continue;
trace_seq_puts(p, symbol_array[i].name);
break;
}
if (!p->len)
trace_seq_printf(p, "0x%lx", val);
trace_seq_putc(p, 0);
return p->buffer;
}
#ifdef CONFIG_KRETPROBES
static inline const char *kretprobed(const char *name)
{