reproduce (this is a W=1 build): git checkout ad5c60d66016e544c51ed98635a74073f761f45d b4 shazam https://lore.kernel.org/r/20240122-imx-mailbox-v1-2-81413f655210@nxp.com # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=i386 olddefconfig make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/mailbox/