reproduce:
        git remote add remoteproc https://git.kernel.org/pub/scm/linux/kernel/git/remoteproc/linux.git
        git fetch remoteproc rpmsg-next
        git checkout remoteproc/rpmsg-next
        b4 shazam https://lore.kernel.org/r/20241015025831.65232-1-yesanishhere@gmail.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs