reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git/commit/?id=ef51a13f0720a767a067eb7389fed926a9237fe1
        git remote add cip https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git
        git fetch --no-tags cip linux-5.10.y-cip-rebase
        git checkout ef51a13f0720a767a067eb7389fed926a9237fe1
        # 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/clk/renesas/