diff options
Diffstat (limited to 'mm/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index ae1d2700f6a3..38bdc439651a 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1908,8 +1908,18 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd, VM_BUG_ON_FOLIO(folio_test_writeback(folio), folio); if (pte_swp_exclusive(old_pte)) rmap_flags |= RMAP_EXCLUSIVE; - - folio_add_anon_rmap_pte(folio, page, vma, addr, rmap_flags); + /* + * We currently only expect small !anon folios, which are either + * fully exclusive or fully shared. If we ever get large folios + * here, we have to be careful. + */ + if (!folio_test_anon(folio)) { + VM_WARN_ON_ONCE(folio_test_large(folio)); + VM_WARN_ON_FOLIO(!folio_test_locked(folio), folio); + folio_add_new_anon_rmap(folio, vma, addr, rmap_flags); + } else { + folio_add_anon_rmap_pte(folio, page, vma, addr, rmap_flags); + } } else { /* ksm created a completely new copy */ folio_add_new_anon_rmap(folio, vma, addr, RMAP_EXCLUSIVE); folio_add_lru_vma(folio, vma); |