reproduce:
        git remote add groeck-staging https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git
        git fetch groeck-staging hwmon-next
        git checkout groeck-staging/hwmon-next
        b4 shazam https://lore.kernel.org/r/63e352150ed51eefce90ca4058af5459730174b2.1702744180.git.alkuor@gmail.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs