3 files changed, 12 insertions, 3 deletions

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 6ab47af5a84..b31cb7da034 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -11,7 +11,7 @@ extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
                                unsigned long address, pmd_t *pmd,
                                pmd_t orig_pmd);
-extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
+extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
                                           unsigned long addr,
                                           pmd_t *pmd,
                                           unsigned int flags);
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 08a943b9cf9..3a8d6b7d95d 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -971,11 +971,12 @@ out_unlock:
         return ret;
 }
 
-struct page *follow_trans_huge_pmd(struct mm_struct *mm,
+struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
                                    unsigned long addr,
                                    pmd_t *pmd,
                                    unsigned int flags)
 {
+        struct mm_struct *mm = vma->vm_mm;
         struct page *page = NULL;
 
         assert_spin_locked(&mm->page_table_lock);
@@ -998,6 +999,14 @@ struct page *follow_trans_huge_pmd(struct mm_struct *mm,
                 _pmd = pmd_mkyoung(pmd_mkdirty(*pmd));
                 set_pmd_at(mm, addr & HPAGE_PMD_MASK, pmd, _pmd);
         }
+        if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) {
+                if (page->mapping && trylock_page(page)) {
+                        lru_add_drain();
+                        if (page->mapping)
+                                mlock_vma_page(page);
+                        unlock_page(page);
+                }
+        }
         page += (addr & ~HPAGE_PMD_MASK) >> PAGE_SHIFT;
         VM_BUG_ON(!PageCompound(page));
         if (flags & FOLL_GET)
diff --git a/mm/memory.c b/mm/memory.c
index 45bb6d296b6..fb135ba4aba 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1528,7 +1528,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
                                 spin_unlock(&mm->page_table_lock);
                                 wait_split_huge_page(vma->anon_vma, pmd);
                         } else {
-                                page = follow_trans_huge_pmd(mm, address,
+                                page = follow_trans_huge_pmd(vma, address,
                                                              pmd, flags);
                                 spin_unlock(&mm->page_table_lock);
                                 goto out;