1 files changed, 7 insertions, 7 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 30991f83d0bf..635451abc8f7 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1591,10 +1591,15 @@ int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
          * than insert_pfn).  If a zero_pfn were inserted into a VM_MIXEDMAP
          * without pte special, it would there be refcounted as a normal page.
          */
-        if (!HAVE_PTE_SPECIAL && pfn_t_valid(pfn)) {
+        if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) {
                 struct page *page;
 
-                page = pfn_t_to_page(pfn);
+                /*
+                 * At this point we are committed to insert_page()
+                 * regardless of whether the caller specified flags that
+                 * result in pfn_t_has_page() == false.
+                 */
+                page = pfn_to_page(pfn_t_to_pfn(pfn));
                 return insert_page(vma, addr, page, vma->vm_page_prot);
         }
         return insert_pfn(vma, addr, pfn, vma->vm_page_prot);
@@ -2232,11 +2237,6 @@ static int wp_page_shared(struct mm_struct *mm, struct vm_area_struct *vma,
 
         page_cache_get(old_page);
 
-        /*
-         * Only catch write-faults on shared writable pages,
-         * read-only shared pages can get COWed by
-         * get_user_pages(.write=1, .force=1).
-         */
         if (vma->vm_ops && vma->vm_ops->page_mkwrite) {
                 int tmp;