reproduce (this is a W=1 build):
        # https://github.com/jonhunter/linux/commit/b6ba16943c776b1cd2b3559317337eb24b70f742
        git remote add jonhunter https://github.com/jonhunter/linux
        git fetch --no-tags jonhunter tegra/next-fixes
        git checkout b6ba16943c776b1cd2b3559317337eb24b70f742
        # 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 kernel/