linux-kernel - Re: [PATCH 1/2] doc: kunit: add information about cleaning source trees

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Message-ID: <c3333ef9-f266-4260-8f75-0da65bcff1da@infradead.org>
Date: Tue, 29 Apr 2025 15:29:18 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Shuah Khan <skhan@...uxfoundation.org>, brendan.higgins@...ux.dev,
 davidgow@...gle.com, rmoar@...gle.com, corbet@....net
Cc: linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
 workflows@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] doc: kunit: add information about cleaning source
 trees



On 4/29/25 3:27 PM, Shuah Khan wrote:
> If kunit run happens in a tree in which a x86_64 kernel was built,
> the source tree could be dirty.
> 
> "make ARCH=um mrproper" will not clean the x86_64 build artifacts.
> Running "make ARCH=x86_64 mrproper" is necessary to clean them.
> 
> Add this information to the documentation.
> 
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
> ---
>  Documentation/dev-tools/kunit/start.rst | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/Documentation/dev-tools/kunit/start.rst b/Documentation/dev-tools/kunit/start.rst
> index a98235326bab..568e29aebd6e 100644
> --- a/Documentation/dev-tools/kunit/start.rst
> +++ b/Documentation/dev-tools/kunit/start.rst
> @@ -39,6 +39,18 @@ can run kunit_tool:
>  	``make ARCH=um mrproper``, just be aware that this will delete the
>  	current configuration and all generated files.
>  
> +	You may see the following error if a prior build leaves behind
> +	header files which 'make ARCH=um mrproper' fails to clean:
> +
> +	"undefined symbol sev_es_trampoline_start referenced ..."
> +
> +	This is special case scenario when a prior x86_64 build populates
> +	the source tree with arch/x86/realmode/rm/pasyms.h. This header
> +	will not be cleaned by 'make ARCH=um mrproper'
> +
> +	If you encouter this problem, run 'make ARCH=x86_64 mrproper' to

	       encounter

> +	remove generated header files.
> +
>  If everything worked correctly, you should see the following:
>  
>  .. code-block::

-- 
~Randy