tracing: Fix tick_stop tracepoint symbols for user export

rostedt · rostedt · commit c87edb361186 · 2016-08-09T09:51:23.000-04:00
The symbols used in the tick_stop tracepoint were not being converted properly into integers in the trace_stop format file. Instead we had this: print fmt: "success=%d dependency=%s", REC->success, __print_symbolic(REC->dependency, { 0, "NONE" }, { (1 << TICK_DEP_BIT_POSIX_TIMER), "POSIX_TIMER" }, { (1 << TICK_DEP_BIT_PERF_EVENTS), "PERF_EVENTS" }, { (1 << TICK_DEP_BIT_SCHED), "SCHED" }, { (1 << TICK_DEP_BIT_CLOCK_UNSTABLE), "CLOCK_UNSTABLE" }) User space tools have no idea how to parse "TICK_DEP_BIT_SCHED" or the other symbols used to do the bit shifting. The reason is that the conversion was done with using the TICK_DEP_MASK_* symbols which are just macros that convert to the BIT shift itself (with the exception of NONE, which was converted properly, because it doesn't use bits, and is defined as zero). The TICK_DEP_BIT_* needs to be denoted by TRACE_DEFINE_ENUM() in order to have this properly converted for user space tools to parse this event. Cc: stable@vger.kernel.org Cc: Frederic Weisbecker <fweisbec@gmail.com> Fixes: e6e6cc2 ("nohz: Use enum code for tick stop failure tracing message") Reported-by: Luiz Capitulino <lcapitulino@redhat.com> Tested-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h
@@ -330,24 +330,32 @@ TRACE_EVENT(itimer_expire,
 #ifdef CONFIG_NO_HZ_COMMON
 
 #define TICK_DEP_NAMES					\
-		tick_dep_name(NONE)			\
+		tick_dep_mask_name(NONE)		\
 		tick_dep_name(POSIX_TIMER)		\
 		tick_dep_name(PERF_EVENTS)		\
 		tick_dep_name(SCHED)			\
 		tick_dep_name_end(CLOCK_UNSTABLE)
 
 #undef tick_dep_name
+#undef tick_dep_mask_name
 #undef tick_dep_name_end
 
-#define tick_dep_name(sdep) TRACE_DEFINE_ENUM(TICK_DEP_MASK_##sdep);
-#define tick_dep_name_end(sdep)  TRACE_DEFINE_ENUM(TICK_DEP_MASK_##sdep);
+/* The MASK will convert to their bits and they need to be processed too */
+#define tick_dep_name(sdep) TRACE_DEFINE_ENUM(TICK_DEP_BIT_##sdep); \
+	TRACE_DEFINE_ENUM(TICK_DEP_MASK_##sdep);
+#define tick_dep_name_end(sdep)  TRACE_DEFINE_ENUM(TICK_DEP_BIT_##sdep); \
+	TRACE_DEFINE_ENUM(TICK_DEP_MASK_##sdep);
+/* NONE only has a mask defined for it */
+#define tick_dep_mask_name(sdep) TRACE_DEFINE_ENUM(TICK_DEP_MASK_##sdep);
 
 TICK_DEP_NAMES
 
 #undef tick_dep_name
+#undef tick_dep_mask_name
 #undef tick_dep_name_end
 
 #define tick_dep_name(sdep) { TICK_DEP_MASK_##sdep, #sdep },
+#define tick_dep_mask_name(sdep) { TICK_DEP_MASK_##sdep, #sdep },
 #define tick_dep_name_end(sdep) { TICK_DEP_MASK_##sdep, #sdep }
 
 #define show_tick_dep_name(val)				\
