linux-kernel - Re: [PATCH] kunit: tool: Force the use of the 'tty' console for UML

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Message-ID: <918b2d05-f51b-0866-89b3-19a016abdaa3@linuxfoundation.org>
Date:   Tue, 5 Jan 2021 12:52:14 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Petr Mladek <pmladek@...e.com>, David Gow <davidgow@...gle.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Senozhatsky <sergey.senozhatsky@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] kunit: tool: Force the use of the 'tty' console for UML

On 1/5/21 11:57 AM, Andy Shevchenko wrote:
> On Tue, Jan 05, 2021 at 09:34:33AM -0700, Shuah Khan wrote:
>> On 1/5/21 9:21 AM, Petr Mladek wrote:
>>> On Mon 2021-01-04 09:23:57, Shuah Khan wrote:
>>>> On 12/22/20 4:11 AM, Andy Shevchenko wrote:
>>>>> On Mon, Dec 21, 2020 at 11:39:00PM -0800, David Gow wrote:
>>>>>> kunit_tool relies on the UML console outputting printk() output to the
>>>>>> tty in order to get results. Since the default console driver could
>>>>>> change, pass 'console=tty' to the kernel.
>>>>>>
>>>>>> This is triggered by a change[1] to use ttynull as a fallback console
>>>>>> driver which -- by chance or by design -- seems to have changed the
>>>>>> default console output on UML, breaking kunit_tool. While this may be
>>>>>> fixed, we should be less fragile to such changes in the default.
>>>>>>
>>>>>> [1]:
>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=757055ae8dedf5333af17b3b5b4b70ba9bc9da4e
>>>>>
>>>>> Reported-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>>>>> Tested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>>>>>
>>>>
>>>> Thank you all. Now in linux-kselftest kunit-fixes branch.
>>>>
>>>> Will send this up for rc3.
>>>>
>>>> Sorry for the delay - have been away from the keyboard for a
>>>> bit.
>>>
>>> JFYI, I am not sure that this is the right solution. I am
>>> looking into it, see
>>> https://lore.kernel.org/linux-kselftest/X%2FSRA1P8t+ONZFKb@alley/
>>> for more details.
>>>
>>
>> Thanks Petr. I will hold off on sending the patch up to Linus and
>> let you find a the right solution.
> 
> Please. leave it in Linux Next at least. Otherwise kunit will be broken for a
> long time which is not good.
> 
> 

Yes. That is the plan. It will be in there until real fix comes in.

thanks,
-- Shuah