linux-kernel - [PATCH AUTOSEL 4.9 1/3] powerpc/selftests: Use timersub() for gettimeofday()

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Message-Id: <20221014135502.2110218-1-sashal@kernel.org>
Date:   Fri, 14 Oct 2022 09:54:58 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     ye xingchen <ye.xingchen@....com.cn>,
        Zeal Robot <zealci@....com.cn>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>, shuah@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kselftest@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 1/3] powerpc/selftests: Use timersub() for gettimeofday()

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

[ Upstream commit c814bf958926ff45a9c1e899bd001006ab6cfbae ]

Use timersub() function to simplify the code.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: ye xingchen <ye.xingchen@....com.cn>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20220816105106.82666-1-ye.xingchen@zte.com.cn
Signed-off-by: Sasha Levin <sashal@...nel.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 3af3c21e8036..7f4bb84f1c9c 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