reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git/commit/?id=05e58da46d8e8f8b29bc9b47053bb0637891c06f
        git remote add linusw-pinctrl https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git
        git fetch --no-tags linusw-pinctrl ib-mux-pinctrl
        git checkout 05e58da46d8e8f8b29bc9b47053bb0637891c06f

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sh olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash drivers/mux/