perf parse-events: Inline parse_events_update_lists

The helper function just wraps a splice and free. Making the free
inline removes a comment, so then it just wraps a splice which we can
make inline too.
Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Tested-by: Atish Patra <atishp@rivosinc.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Beeman Strong <beeman@rivosinc.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240416061533.921723-11-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/parse-events.c

@@ -1720,19 +1720,6 @@ void parse_events__set_leader(char *name, struct list_head *list)
 	leader->group_name = name;
 }
 
-/* list_event is assumed to point to malloc'ed memory */
-void parse_events_update_lists(struct list_head *list_event,
-			       struct list_head *list_all)
-{
-	/*
-	 * Called for single event definition. Update the
-	 * 'all event' list, and reinit the 'single event'
-	 * list, for next event definition.
-	 */
-	list_splice_tail(list_event, list_all);
-	free(list_event);
-}
-
 struct event_modifier {
 	int eu;
 	int ek;

tools/perf/util/parse-events.h

@@ -226,8 +226,6 @@ int parse_events_multi_pmu_add_or_add_pmu(struct parse_events_state *parse_state
 					void *loc_);
 
 void parse_events__set_leader(char *name, struct list_head *list);
-void parse_events_update_lists(struct list_head *list_event,
-			       struct list_head *list_all);
 void parse_events_evlist_error(struct parse_events_state *parse_state,
 			       int idx, const char *str);
 

tools/perf/util/parse-events.y

@@ -125,6 +125,10 @@ static void free_list_evsel(struct list_head* list_evsel)
 }
 %%
 
+ /*
+  * Entry points. We are either parsing events or terminals. Just terminal
+  * parsing is used for parsing events in sysfs.
+  */
 start:
 PE_START_EVENTS start_events
 |
@@ -132,31 +136,36 @@ PE_START_TERMS  start_terms
 
 start_events: groups
 {
+	/* Take the parsed events, groups.. and place into parse_state. */
+	struct list_head *groups  = $1;
 	struct parse_events_state *parse_state = _parse_state;
 
-	/* frees $1 */
-	parse_events_update_lists($1, &parse_state->list);
+	list_splice_tail(groups, &parse_state->list);
+	free(groups);
 }
 
-groups:
+groups: /* A list of groups or events. */
 groups ',' group
 {
-	struct list_head *list  = $1;
+	/* Merge group into the list of events/groups. */
+	struct list_head *groups  = $1;
 	struct list_head *group  = $3;
 
-	/* frees $3 */
-	parse_events_update_lists(group, list);
-	$$ = list;
+	list_splice_tail(group, groups);
+	free(group);
+	$$ = groups;
 }
 |
 groups ',' event
 {
-	struct list_head *list  = $1;
+	/* Merge event into the list of events/groups. */
+	struct list_head *groups  = $1;
 	struct list_head *event = $3;
 
-	/* frees $3 */
-	parse_events_update_lists(event, list);
-	$$ = list;
+
+	list_splice_tail(event, groups);
+	free(event);
+	$$ = groups;
 }
 |
 group
@@ -206,12 +215,12 @@ PE_NAME '{' events '}'
 events:
 events ',' event
 {
+	struct list_head *events  = $1;
 	struct list_head *event = $3;
-	struct list_head *list  = $1;
 
-	/* frees $3 */
-	parse_events_update_lists(event, list);
-	$$ = list;
+	list_splice_tail(event, events);
+	free(event);
+	$$ = events;
 }
 |
 event