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There are many instances in which linear_page_index() (as well as linear_page_delta()) is open-coded, which is confusing and inconsistent. Additionally, vma->vm_pgoff doesn't necessarily make it clear that this is the page offset of the start of the VMA range. Doing so also aids greppability. So use vma_start_pgoff() in favour of directly accessing vma->vm_pgoff, and linear_page_index() where we can. This also lays the ground for future changes which will add an anonymous page offset in order to be able to index MAP_PRIVATE-file backed anon folios in terms of their virtual page offset. No functional change intended. Link: https://lore.kernel.org/20260710-b4-pre-scalable-cow-v2-18-2a5aa403d977@kernel.org Signed-off-by: Lorenzo Stoakes <ljs@kernel.org> Reviewed-by: Gregory Price <gourry@gourry.net> Reviewed-by: SJ Park <sj@kernel.org> Reviewed-by: Pedro Falcato <pfalcato@suse.de> Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Cc: Ackerley Tng <ackerleytng@google.com> Cc: David Hildenbrand (Arm) <david@kernel.org> Cc: Kai Huang <kai.huang@intel.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: Liam R. Howlett (Oracle) <liam@infradead.org> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>