linux-kernel - Re: [PATCH 2/3] kunit: make kunit_test

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Date:   Wed, 9 Mar 2022 07:37:06 +0100
From:   Marco Elver <elver@...gle.com>
To:     "liupeng (DM)" <liupeng256@...wei.com>
Cc:     brendanhiggins@...gle.com, glider@...gle.com, dvyukov@...gle.com,
        akpm@...ux-foundation.org, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        wangkefeng.wang@...wei.com
Subject: Re: [PATCH 2/3] kunit: make kunit_test_timeout compatible with comment

On Wed, 9 Mar 2022 at 07:32, liupeng (DM) <liupeng256@...wei.com> wrote:
>
> Thank you for your advice.
>
> On 2022/3/9 14:03, Marco Elver wrote:
> > On Wed, 9 Mar 2022 at 02:29, 'Peng Liu' via kasan-dev
> > <kasan-dev@...glegroups.com> wrote:
> >> In function kunit_test_timeout, it is declared "300 * MSEC_PER_SEC"
> >> represent 5min. However, it is wrong when dealing with arm64 whose
> >> default HZ = 250, or some other situations. Use msecs_to_jiffies to
> >> fix this, and kunit_test_timeout will work as desired.
> >>
> >> Signed-off-by: Peng Liu <liupeng256@...wei.com>
> > Does this need a:
> >
> > Fixes: 5f3e06208920 ("kunit: test: add support for test abort")
> >
> > ?
>
> Yes, I will add this description.
>
> >> ---
> >>   lib/kunit/try-catch.c | 2 +-
> >>   1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/lib/kunit/try-catch.c b/lib/kunit/try-catch.c
> >> index 6b3d4db94077..f7825991d576 100644
> >> --- a/lib/kunit/try-catch.c
> >> +++ b/lib/kunit/try-catch.c
> >> @@ -52,7 +52,7 @@ static unsigned long kunit_test_timeout(void)
> >>           * If tests timeout due to exceeding sysctl_hung_task_timeout_secs,
> >>           * the task will be killed and an oops generated.
> >>           */
> >> -       return 300 * MSEC_PER_SEC; /* 5 min */
> >> +       return 300 * msecs_to_jiffies(MSEC_PER_SEC); /* 5 min */
> > Why not just "300 * HZ" ?
>
> Because I have seen patch
>
> df3c30f6e904 ("staging: lustre: replace direct HZ access with kernel APIs").
>
> Here, both "msecs_to_jiffies(MSEC_PER_SEC)" and "300 * HZ" is ok for me.

I see - let's keep as-is and use msecs_to_jiffies().

Thanks,
-- Marco