filemap: remove find_subpage()

All users of this function now call folio_file_page() instead.  Delete it.

Link: https://lkml.kernel.org/r/20250402210612.2444135-6-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index cd4bd0f..0ddd4bd 100644 (file)
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -945,19 +945,6 @@ static inline bool folio_contains(struct folio *folio, pgoff_t index)
        return index - folio_index(folio) < folio_nr_pages(folio);
 }
 
-/*
- * Given the page we found in the page cache, return the page corresponding
- * to this index in the file
- */
-static inline struct page *find_subpage(struct page *head, pgoff_t index)
-{
-       /* HugeTLBfs wants the head page regardless */
-       if (PageHuge(head))
-               return head;
-
-       return head + (index & (thp_nr_pages(head) - 1));
-}
-
 unsigned filemap_get_folios(struct address_space *mapping, pgoff_t *start,
                pgoff_t end, struct folio_batch *fbatch);
 unsigned filemap_get_folios_contig(struct address_space *mapping,