linux-kernel - Re: [PATCH 2/2] kunit: add tips to clean source tree to build help message

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Message-ID: <CABVgOSnKPPLH9BASOZ0b3mMOUuiVXxsdXQcoQqyTKd5UYONpUQ@mail.gmail.com>
Date: Wed, 30 Apr 2025 11:54:39 +0800
From: David Gow <davidgow@...gle.com>
To: Shuah Khan <skhan@...uxfoundation.org>
Cc: brendan.higgins@...ux.dev, rmoar@...gle.com, corbet@....net, 
	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 2/2] kunit: add tips to clean source tree to build help message

On Wed, 30 Apr 2025 at 06:27, Shuah Khan <skhan@...uxfoundation.org> wrote:
>
> Add tips to clean source tree to build help message. When user run
> kunit.py after building another kernel for ARCH=foo, it is necessary
> to run 'make ARCH=foo mrproper' to remove all build artifacts generated
> during the build. In such cases, kunit build could fail.
>
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
> ---

Thanks for doing this.

This looks good to me, save for the issue below.

I do wonder whether there's a more general fix we can do in the
makefiles, but I'm not sure how that'd have to work. Maybe by storing
the architecture used somewhere and amending the error based on that,
or hacking around the specific x86_64/UML incompatibilities. But let's
go ahead with this fix regardless.

Cheers,
-- David

>  tools/testing/kunit/kunit.py | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
> index 7f9ae55fd6d5..db86a396ed33 100755
> --- a/tools/testing/kunit/kunit.py
> +++ b/tools/testing/kunit/kunit.py
> @@ -583,7 +583,7 @@ def main(argv: Sequence[str]) -> None:
>                                                 'the options in .kunitconfig')
>         add_common_opts(config_parser)
>
> -       build_parser = subparser.add_parser('build', help='Builds a kernel with KUnit tests')
> +       build_parser = subparser.add_parser('build', help='Builds a kernel with KUnit tests. Successful build depends on a clean source tree. Run mrproper to clean generated artifcats for prior ARCH=foo kernel build. Run 'make ARCH=foo mrproper')

Because this string is enclosed by single quotes, the 'make ARCH=foo
mrproper' is not part of the string (and there's a missing terminating
quote as well).

Maybe change help= to use double quotes, and add the missing one? Or
use double quotes or backticks for the make example?


>         add_common_opts(build_parser)
>         add_build_opts(build_parser)
>
> --
> 2.47.2
>

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