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Update the documentation regarding vmemmap optimization for hugetlb to reflect the changes in how the kernel maps the tail pages. Fake heads no longer exist. Remove their description. [kas@kernel.org: update vmemmap_dedup.rst] Link: https://lkml.kernel.org/r/20260302105630.303492-1-kas@kernel.org Link: https://lkml.kernel.org/r/20260227194302.274384-18-kas@kernel.org Signed-off-by: Kiryl Shutsemau <kas@kernel.org> Reviewed-by: Muchun Song <muchun.song@linux.dev> Reviewed-by: David Hildenbrand (Arm) <david@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Baoquan He <bhe@redhat.com> Cc: Christoph Lameter <cl@gentwo.org> Cc: David Rientjes <rientjes@google.com> Cc: Frank van der Linden <fvdl@google.com> Cc: Harry Yoo <harry.yoo@oracle.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Oscar Salvador <osalvador@suse.de> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Usama Arif <usamaarif642@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>