[PATCH AUTOSEL 5.15 2/8] powerpc/selftests: Use timersub() for gettimeofday()

Sasha Levin
2022-10-14T13:54:08Z

From: ye xingchen <ye.xingchen@zte.com.cn>

[ Upstream commit c814bf958926ff45a9c1e899bd001006ab6cfbae ]

Use timersub() function to simplify the code.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220816105106.82666-1-ye.xingchen@zte.com.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/testing/selftests/powerpc/benchmarks/gettimeofday.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/powerpc/benchmarks/gettimeofday.c b/tools/testing/selftests/powerpc/benchmarks/gettimeofday.c
index 6b415683357b..580fcac0a09f 100644
--- a/tools/testing/selftests/powerpc/benchmarks/gettimeofday.c
+++ b/tools/testing/selftests/powerpc/benchmarks/gettimeofday.c
@@ -12,7 +12,7 @@ static int test_gettimeofday(void)
{
int i;

- struct timeval tv_start, tv_end;
+ struct timeval tv_start, tv_end, tv_diff;

gettimeofday(&tv_start, NULL);

@@ -20,7 +20,9 @@ static int test_gettimeofday(void)
gettimeofday(&tv_end, NULL);
}

- printf("time = %.6f\n", tv_end.tv_sec - tv_start.tv_sec + (tv_end.tv_usec - tv_start.tv_usec) * 1e-6);
+ timersub(&tv_start, &tv_end, &tv_diff);
+
+ printf("time = %.6f\n", tv_diff.tv_sec + (tv_diff.tv_usec) * 1e-6);

return 0;
}
--
2.35.1