reproduce (this is a W=1 build):
        git checkout v6.15-rc2
        b4 shazam https://lore.kernel.org/r/20250411085932.1902662-1-arnd@kernel.org
        # 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/mmc/host/