Input: wacom_w8001 - ignore invalid pen data packets

[deliverable/linux.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index 305537fc86406076ba07b3cdfeb6bf7affbc8ff6..07493e34ab7e281936d43cb84e681728a23cbc4a 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1222,15 +1222,8 @@ static inline unsigned long zap_pmd_range(struct mmu_gather *tlb,
                next = pmd_addr_end(addr, end);
                if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) {
                        if (next - addr != HPAGE_PMD_SIZE) {
-#ifdef CONFIG_DEBUG_VM
-                               if (!rwsem_is_locked(&tlb->mm->mmap_sem)) {
-                                       pr_err("%s: mmap_sem is unlocked! addr=0x%lx end=0x%lx vma->vm_start=0x%lx vma->vm_end=0x%lx\n",
-                                               __func__, addr, end,
-                                               vma->vm_start,
-                                               vma->vm_end);
-                                       BUG();
-                               }
-#endif
+                               VM_BUG_ON_VMA(vma_is_anonymous(vma) &&
+                                   !rwsem_is_locked(&tlb->mm->mmap_sem), vma);
                                split_huge_pmd(vma, pmd, addr);
                        } else if (zap_huge_pmd(tlb, vma, pmd, addr))
                                goto next;
@@ -2380,6 +2373,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
         * not dirty accountable.
         */
        if (PageAnon(old_page) && !PageKsm(old_page)) {
+               int total_mapcount;
                if (!trylock_page(old_page)) {
                        get_page(old_page);
                        pte_unmap_unlock(page_table, ptl);
@@ -2394,13 +2388,18 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
                        }
                        put_page(old_page);
                }
-               if (reuse_swap_page(old_page)) {
-                       /*
-                        * The page is all ours.  Move it to our anon_vma so
-                        * the rmap code will not search our parent or siblings.
-                        * Protected against the rmap code by the page lock.
-                        */
-                       page_move_anon_rmap(old_page, vma, address);
+               if (reuse_swap_page(old_page, &total_mapcount)) {
+                       if (total_mapcount == 1) {
+                               /*
+                                * The page is all ours. Move it to
+                                * our anon_vma so the rmap code will
+                                * not search our parent or siblings.
+                                * Protected against the rmap code by
+                                * the page lock.
+                                */
+                               page_move_anon_rmap(compound_head(old_page),
+                                                   vma, address);
+                       }
                        unlock_page(old_page);
                        return wp_page_reuse(mm, vma, address, page_table, ptl,
                                             orig_pte, old_page, 0, 0);
@@ -2624,7 +2623,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
        inc_mm_counter_fast(mm, MM_ANONPAGES);
        dec_mm_counter_fast(mm, MM_SWAPENTS);
        pte = mk_pte(page, vma->vm_page_prot);
-       if ((flags & FAULT_FLAG_WRITE) && reuse_swap_page(page)) {
+       if ((flags & FAULT_FLAG_WRITE) && reuse_swap_page(page, NULL)) {
                pte = maybe_mkwrite(pte_mkdirty(pte), vma);
                flags &= ~FAULT_FLAG_WRITE;
                ret |= VM_FAULT_WRITE;