linux-kernel - Re: [PATCH v3 3/3] lib/test_crc: Add test cases for crc calculation

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Message-ID: <CAHp75Ve7w8HxAcRXozsctFETuBtA0VD6jAsExEb6Wtq4UYRNAg@mail.gmail.com>
Date:   Tue, 17 Jul 2018 23:59:38 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Noah Massey <noah.massey@...il.com>
Cc:     Coly Li <colyli@...e.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-bcache@...r.kernel.org, linux-block@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>
Subject: Re: [PATCH v3 3/3] lib/test_crc: Add test cases for crc calculation

On Tue, Jul 17, 2018 at 9:51 PM, Noah Massey <noah.massey@...il.com> wrote:
> On Tue, Jul 17, 2018 at 10:56 AM Coly Li <colyli@...e.de> wrote:

>> +               pr_info("test_crc: %s: PASSED:(0x%016llx, expected 0x%016llx)\n",
>> +                       name, crc, expval);
>
> I don't think we should have specific kernel output for passed tests.
> If a new test is added which follows this pattern, the 0-day will fail
> because the kernel output would change. Along the lines of "silence is
> golden", if no test hit the error output, we're good.

Agree.

>> +       if (err == 0)
>> +               pr_info("test_crc: all %d tests passed\n", i);
>
> Similar to previous comment: we should not report the number of passed
> tests, since adding a test would invalidate previous golden output.
> Also, consider the situation where some tests are conditionally
> executed depending on kconfig.

We do similar in many test modules and I know at least two that had
been changed in order to get new test cases.
Are you proposing to change 'em all?

-- 
With Best Regards,
Andy Shevchenko