[PATCH 5.8 107/186] perf bench: The do_run_multi_threaded() function must use IS_ERR(perf_session__new())

From: Greg Kroah-Hartman
Date: Tue Sep 08 2020 - 15:32:39 EST

From: YueHaibing <yuehaibing@xxxxxxxxxx>

[ Upstream commit e4d71f79cf5c10fa8bc6f5d3bebea570c9c438f1 ]

In case of error, the function perf_session__new() returns ERR_PTR() and
never returns NULL. The NULL test in the return value check should be
replaced with IS_ERR()

Committer notes:

This wasn't compiling due to an extraneous '{' not matched by a '}', fix

Fixes: 13edc237200c ("perf bench: Add a multi-threaded synthesize benchmark")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Ian Rogers <irogers@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lore.kernel.org/lkml/20200902140526.26916-1-yuehaibing@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
tools/perf/bench/synthesize.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/bench/synthesize.c b/tools/perf/bench/synthesize.c
index 8d624aea1c5e5..b2924e3181dc3 100644
--- a/tools/perf/bench/synthesize.c
+++ b/tools/perf/bench/synthesize.c
@@ -162,8 +162,8 @@ static int do_run_multi_threaded(struct target *target,
for (i = 0; i < multi_iterations; i++) {
session = perf_session__new(NULL, false, NULL);
- if (!session)
- return -ENOMEM;
+ if (IS_ERR(session))
+ return PTR_ERR(session);

atomic_set(&event_count, 0);
gettimeofday(&start, NULL);