[PATCH linux-next] powerpc/selftests:Use timersub() for gettimeofday()

From: cgel.zte@gmail.com
To: mpe@ellerman.id.au
Cc: npiggin@gmail.com, christophe.leroy@csgroup.eu, shuah@kernel.org,
	linux-kselftest@vger.kernel.org,
	ye xingchen <ye.xingchen@zte.com.cn>,
	Zeal Robot <zealci@zte.com.cn>
Subject: [PATCH linux-next] powerpc/selftests:Use timersub() for gettimeofday()
Date: Tue, 16 Aug 2022 10:51:06 +0000	[thread overview]
Message-ID: <20220816105106.82666-1-ye.xingchen@zte.com.cn> (raw)

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

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>
---
 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;
 }
-- 
2.25.1
