reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/jmondi/linux.git/commit/?id=e1ae55c1c7105b10788c4b50c4185e82c309fdda
        git remote add jmondi https://git.kernel.org/pub/scm/linux/kernel/git/jmondi/linux.git
        git fetch --no-tags jmondi pispbe/media-staging/be-upstream
        git checkout e1ae55c1c7105b10788c4b50c4185e82c309fdda
        # 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