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Patch series "Batch unmap of uffd-wp file folios", v2. Currently, batched unmapping is supported if: 1) folio is a file folio, not belonging to uffd-wp VMA 2) folio is anonymous and not swapbacked (lazyfree), not belonging to uffd-wp VMA So the cases which are not supported are 1) folio belonging to uffd-wp VMA 2) folio is anonymous and swapbacked It is easy to see that this adds a lot of cognitive load while reading try_to_unmap_one - we need to remember throughout whether nr_pages == 1 or > 1. The uffd-wp handling in try_to_unmap_one is regarding preserving the uffd-wp state for file folios via pte_install_uffd_wp_if_needed (for anon folio, we handle that while constructing the swap pte). Stop special casing on uffd-wp VMAs by simply adding batching support to pte_install_uffd_wp_if_needed. This patch (of 3): pte_install_uffd_wp_if_needed() has grown too large for mm_inline.h. Move it to memory.c. This helper is only used inside mm/, so declare it in mm/internal.h instead of a public header. While at it, convert the comment to kerneldoc and rename the local arguments from pte/pteval to ptep/pte so the pointer and PTE value are easier to distinguish. Link: https://lore.kernel.org/20260720065508.2695106-1-dev.jain@arm.com Link: https://lore.kernel.org/20260720065508.2695106-2-dev.jain@arm.com Signed-off-by: Dev Jain <dev.jain@arm.com> Acked-by: David Hildenbrand (Arm) <david@kernel.org> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: Barry Song <baohua@kernel.org> Cc: Harry Yoo <harry@kernel.org> Cc: Jann Horn <jannh@google.com> Cc: Kairui Song <kasong@tencent.com> Cc: Lance Yang <lance.yang@linux.dev> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Rik van Riel <riel@surriel.com> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Shakeel Butt <shakeel.butt@linux.dev> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Wei Xu <weixugc@google.com> Cc: Yuanchu Xie <yuanchu@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>