reproduce (this is a W=1 build):
        git remote add axboe https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git
        git fetch axboe for-next
        git checkout axboe/for-next
        b4 shazam https://lore.kernel.org/r/20260427020142.358912-3-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