On Thu, Oct 17, 2019 at 9:42 AM Song Liu <[email protected]> wrote: > > From: William Kucharski <[email protected]> > > __remove_mapping() assumes that pages can only be either base pages > or HPAGE_PMD_SIZE. Ask the page what size it is. > > Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS") > Signed-off-by: William Kucharski <[email protected]> > Signed-off-by: Matthew Wilcox (Oracle) <[email protected]> > Signed-off-by: Song Liu <[email protected]>
Acked-by: Yang Shi <[email protected]> > --- > mm/vmscan.c | 5 +---- > 1 file changed, 1 insertion(+), 4 deletions(-) > > diff --git a/mm/vmscan.c b/mm/vmscan.c > index c6659bb758a4..f870da1f4bb7 100644 > --- a/mm/vmscan.c > +++ b/mm/vmscan.c > @@ -932,10 +932,7 @@ static int __remove_mapping(struct address_space > *mapping, struct page *page, > * Note that if SetPageDirty is always performed via set_page_dirty, > * and thus under the i_pages lock, then this ordering is not > required. > */ > - if (unlikely(PageTransHuge(page)) && PageSwapCache(page)) > - refcount = 1 + HPAGE_PMD_NR; > - else > - refcount = 2; > + refcount = 1 + compound_nr(page); > if (!page_ref_freeze(page, refcount)) > goto cannot_free; > /* note: atomic_cmpxchg in page_ref_freeze provides the smp_rmb */ > -- > 2.17.1 > >
