[PATCH 5.15 522/731] perf stat: Refactor __run_perf_stat() common code

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Adrián Herrera Arcila <adrian.herrera@xxxxxxx>

[ Upstream commit bb8bc52e75785af94b9ba079277547d50d018a52 ]

This extracts common code from the branches of the forks if-then-else.

enable_counters(), which was at the beginning of both branches of the
conditional, is now unconditional; evlist__start_workload() is extracted
to a different if, which enables making the common clocking code
unconditional.

Reviewed-by: Leo Yan <leo.yan@xxxxxxxxxx>
Signed-off-by: Adrián Herrera Arcila <adrian.herrera@xxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: James Clark <james.clark@xxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Song Liu <songliubraving@xxxxxx>
Link: https://lore.kernel.org/r/20220729161244.10522-1-adrian.herrera@xxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Stable-dep-of: c587e77e100f ("perf stat: Do not delay the workload with --delay")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 tools/perf/builtin-stat.c | 25 +++++++++----------------
 1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index abf88a1ad455..2602c750779d 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -953,18 +953,18 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
 			return err;
 	}
 
-	/*
-	 * Enable counters and exec the command:
-	 */
-	if (forks) {
-		err = enable_counters();
-		if (err)
-			return -1;
+	err = enable_counters();
+	if (err)
+		return -1;
+
+	/* Exec the command, if any */
+	if (forks)
 		evlist__start_workload(evsel_list);
 
-		t0 = rdclock();
-		clock_gettime(CLOCK_MONOTONIC, &ref_time);
+	t0 = rdclock();
+	clock_gettime(CLOCK_MONOTONIC, &ref_time);
 
+	if (forks) {
 		if (interval || timeout || evlist__ctlfd_initialized(evsel_list))
 			status = dispatch_events(forks, timeout, interval, &times);
 		if (child_pid != -1) {
@@ -982,13 +982,6 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
 		if (WIFSIGNALED(status))
 			psignal(WTERMSIG(status), argv[0]);
 	} else {
-		err = enable_counters();
-		if (err)
-			return -1;
-
-		t0 = rdclock();
-		clock_gettime(CLOCK_MONOTONIC, &ref_time);
-
 		status = dispatch_events(forks, timeout, interval, &times);
 	}
 
-- 
2.35.1