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

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Message-ID: <dc8f4035a8d493be9ddc0e868a3ffd67626cca00.1745965121.git.skhan@linuxfoundation.org>
Date: Tue, 29 Apr 2025 16:27:12 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: brendan.higgins@...ux.dev,
	davidgow@...gle.com,
	rmoar@...gle.com,
	corbet@....net
Cc: Shuah Khan <skhan@...uxfoundation.org>,
	linux-kselftest@...r.kernel.org,
	kunit-dev@...glegroups.com,
	workflows@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] kunit: add tips to clean source tree to build help message

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