kunit kernel build could fail if there are ny build artifacts from a prior kernel build. These can be hard to debug if the build artifact happens to be generated header file. It took me a while to debug kunit build fail on ARCH=x86_64 in a tree which had a generated header file arch/x86/realmode/rm/pasyms.h
make ARCH=um mrproper will not clean the tree. It is necessary to run make ARCH=x86_64 mrproper
Example work-flow that could lead to this:
make allmodconfig (x86_64) make ./tools/testing/kunit/kunit.py run
Add this to the documentation and kunit.py build help message.
Shuah Khan (2): doc: kunit: add information about cleaning source trees kunit: add tips to clean source tree to build help message
Documentation/dev-tools/kunit/start.rst | 12 ++++++++++++ tools/testing/kunit/kunit.py | 2 +- 2 files changed, 13 insertions(+), 1 deletion(-)