On Fri, Jul 26, 2024 at 09:46:17PM +1200, Barry Song wrote: > - folio = vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0, > - vma, vmf->address, false); > + folio = alloc_swap_folio(vmf); > page = &folio->page; This is no longer correct. You need to set 'page' to the precise page that is being faulted rather than the first page of the folio. It was fine before because it always allocated a single-page folio, but now it must use folio_page() or folio_file_page() (whichever has the correct semantics for you). Also you need to fix your test suite to notice this bug. I suggest doing that first so that you know whether you've got the calculation correct.
