diff options
| -rw-r--r-- | include/linux/rmap.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h index 7229b9baf20d..5cb0d419a1d7 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -200,6 +200,9 @@ static inline void __folio_rmap_sanity_checks(struct folio *folio, /* hugetlb folios are handled separately. */ VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio); + /* When (un)mapping zeropages, we should never touch ref+mapcount. */ + VM_WARN_ON_FOLIO(is_zero_folio(folio), folio); + /* * TODO: we get driver-allocated folios that have nothing to do with * the rmap using vm_insert_page(); therefore, we cannot assume that |