reproduce (this is a W=1 build):
        git remote add efi https://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git
        git fetch efi next
        git checkout efi/next
        b4 shazam https://lore.kernel.org/r/20251217112845.1814119-4-ahmed.tiba@arm.com

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash