In the following patches, shmem will support the swap out of large folios, which means the shmem mappings may contain large order swap entries, so using xa_get_order() to get the folio order of the shmem swap entry to update the '*start' correctly. Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> --- mm/filemap.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/filemap.c b/mm/filemap.c index 95d56cc788ef..c1a703eb8116 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2056,6 +2056,8 @@ unsigned find_get_entries(struct address_space *mapping, pgoff_t *start, folio = fbatch->folios[idx]; if (!xa_is_value(folio)) nr = folio_nr_pages(folio); + else + nr = 1 << xa_get_order(&mapping->i_pages, indices[idx]); *start = indices[idx] + nr; } return folio_batch_count(fbatch); @@ -2120,6 +2122,8 @@ unsigned find_lock_entries(struct address_space *mapping, pgoff_t *start, folio = fbatch->folios[idx]; if (!xa_is_value(folio)) nr = folio_nr_pages(folio); + else + nr = 1 << xa_get_order(&mapping->i_pages, indices[idx]); *start = indices[idx] + nr; } return folio_batch_count(fbatch); -- 2.39.3
