reproduce (this is a W=1 build):
        # https://github.com/brauner/linux/commit/5589673e8d8d31ff2cec82181676c510e5afdb8d
        git remote add brauner-github https://github.com/brauner/linux.git
        git fetch --no-tags brauner-github vfs-6.18.iomap
        git checkout 5589673e8d8d31ff2cec82181676c510e5afdb8d
        # 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 fs/iomap/