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powerpc/selftests: Use timersub() for gettimeofday()

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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
This commit is contained in:
ye xingchen 2022-08-16 10:51:06 +00:00 committed by Michael Ellerman
parent 1c23f9e627
commit c814bf9589
1 changed files with 4 additions and 2 deletions
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6
tools/testing/selftests/powerpc/benchmarks/gettimeofday.c
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@ -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;
}