reproduce (this is a W=1 build): git checkout linus/master b4 shazam https://lore.kernel.org/r/20240327204450.14914-4-tzimmermann@suse.de # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=um olddefconfig make W=1 O=build_dir ARCH=um SHELL=/bin/bash