6.6-stable review patch. If anyone has any objections, please let me know.
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From: Michael Ellerman mpe@ellerman.id.au
[ Upstream commit 2bf66e66d2e6feece6175ec09ec590a0a8563bdd ]
Commit c814bf958926 ("powerpc/selftests: Use timersub() for gettimeofday()"), got the order of arguments to timersub() wrong, leading to a negative time delta being reported, eg:
test: gettimeofday tags: git_version:v6.12-rc5-409-gdddf291c3030 time = -3.297781 success: gettimeofday
The correct order is minuend, subtrahend, which in this case is end, start. Which gives:
test: gettimeofday tags: git_version:v6.12-rc5-409-gdddf291c3030-dirty time = 3.300650 success: gettimeofday
Fixes: c814bf958926 ("powerpc/selftests: Use timersub() for gettimeofday()") Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Madhavan Srinivasan maddy@linux.ibm.com Link: https://patch.msgid.link/20241218114347.428108-1-mpe@ellerman.id.au Signed-off-by: Sasha Levin sashal@kernel.org --- tools/testing/selftests/powerpc/benchmarks/gettimeofday.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/powerpc/benchmarks/gettimeofday.c b/tools/testing/selftests/powerpc/benchmarks/gettimeofday.c index 580fcac0a09f3..b71ef8a493ed1 100644 --- a/tools/testing/selftests/powerpc/benchmarks/gettimeofday.c +++ b/tools/testing/selftests/powerpc/benchmarks/gettimeofday.c @@ -20,7 +20,7 @@ static int test_gettimeofday(void) gettimeofday(&tv_end, NULL); }
- timersub(&tv_start, &tv_end, &tv_diff); + timersub(&tv_end, &tv_start, &tv_diff);
printf("time = %.6f\n", tv_diff.tv_sec + (tv_diff.tv_usec) * 1e-6);