diff options
Diffstat (limited to 'mm/page_vma_mapped.c')
| -rw-r--r-- | mm/page_vma_mapped.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c index 8ec6ba230bb9..3bd3008db4cb 100644 --- a/mm/page_vma_mapped.c +++ b/mm/page_vma_mapped.c @@ -138,16 +138,28 @@ restart: if (!pud_present(*pud)) return false; pvmw->pmd = pmd_offset(pud, pvmw->address); - if (pmd_trans_huge(*pvmw->pmd)) { + if (pmd_trans_huge(*pvmw->pmd) || is_pmd_migration_entry(*pvmw->pmd)) { pvmw->ptl = pmd_lock(mm, pvmw->pmd); - if (!pmd_present(*pvmw->pmd)) - return not_found(pvmw); if (likely(pmd_trans_huge(*pvmw->pmd))) { if (pvmw->flags & PVMW_MIGRATION) return not_found(pvmw); if (pmd_page(*pvmw->pmd) != page) return not_found(pvmw); return true; + } else if (!pmd_present(*pvmw->pmd)) { + if (thp_migration_supported()) { + if (!(pvmw->flags & PVMW_MIGRATION)) + return not_found(pvmw); + if (is_migration_entry(pmd_to_swp_entry(*pvmw->pmd))) { + swp_entry_t entry = pmd_to_swp_entry(*pvmw->pmd); + + if (migration_entry_to_page(entry) != page) + return not_found(pvmw); + return true; + } + } else + WARN_ONCE(1, "Non present huge pmd without pmd migration enabled!"); + return not_found(pvmw); } else { /* THP pmd was split under us: handle on pte level */ spin_unlock(pvmw->ptl); |