reproduce (this is a W=1 build):
        # https://github.com/Xilinx/linux-xlnx/commit/ba5e49ae789e8f4cf738103c73ca1bd9952c6e7c
        git remote add xilinx-xlnx https://github.com/Xilinx/linux-xlnx
        git fetch --no-tags xilinx-xlnx lkp_test
        git checkout ba5e49ae789e8f4cf738103c73ca1bd9952c6e7c
        # 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