diff options
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index 2b336c4277da..9d643b7a99ce 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1284,6 +1284,12 @@ void page_add_file_rmap(struct page *page, bool compound) if (!atomic_inc_and_test(compound_mapcount_ptr(page))) goto out; } else { + if (PageTransCompound(page)) { + VM_BUG_ON_PAGE(!PageLocked(page), page); + SetPageDoubleMap(compound_head(page)); + if (PageMlocked(page)) + clear_page_mlock(compound_head(page)); + } if (!atomic_inc_and_test(&page->_mapcount)) goto out; } @@ -1458,8 +1464,14 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, */ if (!(flags & TTU_IGNORE_MLOCK)) { if (vma->vm_flags & VM_LOCKED) { - /* Holding pte lock, we do *not* need mmap_sem here */ - mlock_vma_page(page); + /* PTE-mapped THP are never mlocked */ + if (!PageTransCompound(page)) { + /* + * Holding pte lock, we do *not* need + * mmap_sem here + */ + mlock_vma_page(page); + } ret = SWAP_MLOCK; goto out_unmap; } |