reproduce: # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f6757dfcfde722fdeaee371b66f63d7eb61dd7e4 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout f6757dfcfde722fdeaee371b66f63d7eb61dd7e4 make menuconfig # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS # install Sphinx 2.4.4 make htmldocs