reproduce: git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git git fetch tip timers/core git checkout tip/timers/core b4 shazam https://lore.kernel.org/r/20250506022301.2588282-1-robh@kernel.org make menuconfig # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS # install Sphinx 2.4.4 make htmldocs