reproduce (this is a W=1 build):
        git remote add driver-core https://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core.git
        git fetch driver-core driver-core-testing
        git checkout driver-core/driver-core-testing
        b4 shazam https://lore.kernel.org/r/20260307200736.4192234-1-atomlin@atomlin.com
        # apt-get install llvm-dev

        # save the config file
        make W=1 ARCH=i386 olddefconfig
        make W=1 ARCH=i386 
        make W=1 headers_install
        make W=1 -C tools/testing/selftests