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

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Message-ID: <20210105185731.GT4077@smile.fi.intel.com>
Date:   Tue, 5 Jan 2021 20:57:31 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Shuah Khan <skhan@...uxfoundation.org>
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
Subject: Re: [PATCH] kunit: tool: Force the use of the 'tty' console for UML

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.


-- 
With Best Regards,
Andy Shevchenko