linux-kernel - Re: [PATCH 2/3] selftests/resctrl: Return KSFT_SKIP(4) if resctrl filessystem is not supported or resctrl is not run as root

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Date:   Wed, 1 Dec 2021 16:39:32 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     "tan.shaopeng@...itsu.com" <tan.shaopeng@...itsu.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Shuah Khan <shuah@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH 2/3] selftests/resctrl: Return KSFT_SKIP(4) if resctrl
 filessystem is not supported or resctrl is not run as root

Hi Shaopeng Tan,

On 11/30/2021 6:36 PM, tan.shaopeng@...itsu.com wrote:
> Hi Reinette
>   
>> (subject line and commit message: filessystem -> file system)
> Thanks.
>   
>> On 11/10/2021 1:33 AM, Shaopeng Tan wrote:
>>> From: "Tan, Shaopeng" <tan.shaopeng@...fujitsu.com>
>>>
>>> To unify the return code of resctrl_tests with the return code of
>>> selftest set, return KSFT_SKIP (4) if resctrl filessystem is not
>>> supported or resctrl is not run as root.
>>
>> Could you please elaborate how changing ksft_exit_fail_msg() to
>> ksft_exit_skip() accomplishes the goal of unifying the return code?
>> What is wrong with using ksft_exit_fail_msg()?
> 
> In selftest framwork,
> if a test need root privileges, but it is run as user privileges,
> the test result will counted as a SKIP item, instead of a FAIL item.

Thank you for the details. I think it is important to highlight that a 
skipped test is marked as successful to not unnecessarily report a 
feature failure when there actually is a failure in the test environment.

Reinette