reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git/commit/?id=3ec01400bd0a58b64fcbf0bc190ea114dff2364f
        git remote add conor https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git
        git fetch --no-tags conor pcie-fix-series
        git checkout 3ec01400bd0a58b64fcbf0bc190ea114dff2364f
        # 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/pci/controller/