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Diffstat (limited to 'mm/rmap.c')
-rw-r--r--mm/rmap.c16
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;
}