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The 'Title underline too short' warning has been fixed by using the correct length underlines. I have verified it in a local build with "make htmldocs". The title appears as expected. And V3 patch has been sent with the fix: https://lore.kernel.org/all/20250405060610.860465-1-zhiquan1.li@intel.com/ On 2025/4/4 10:14, Stephen Rothwell wrote: > Hi all, > > After merging the mm tree, today's linux-next build (htmldocs) produced > this warning: > > Documentation/admin-guide/kdump/vmcoreinfo.rst:335: WARNING: Title underline too short. > > PAGE_BUDDY_MAPCOUNT_VALUE(~PG_buddy)|PAGE_OFFLINE_MAPCOUNT_VALUE(~PG_offline)|PAGE_OFFLINE_MAPCOUNT_VALUE(~PG_unaccepted) > ----------------------------------------------------------------------------- [docutils] > > Introduced by commit > > 77b3dbad6b01 ("crash: export PAGE_UNACCEPTED_MAPCOUNT_VALUE to vmcoreinfo") > > in the mm-nonmm-unstable branch of the mm tree. >