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

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 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; }