reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git/commit/?id=8498e6b2b8524b52f94ab22d65b50cd4508673c7
        git remote add linusw-pinctrl https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git
        git fetch --no-tags linusw-pinctrl for-next
        git checkout 8498e6b2b8524b52f94ab22d65b50cd4508673c7
        # 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/pinctrl/