1 files changed, 12 insertions, 3 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index f6106d3f3dab..3891a368e5e0 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1171,10 +1171,16 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
  * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
  * @pte_hole: if set, called for each hole at all levels
  * @hugetlb_entry: if set, called for each hugetlb entry
- *                 *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
- *                            is used.
+ * @test_walk: caller specific callback function to determine whether
+ *             we walk over the current vma or not. A positive returned
+ *             value means "do page table walk over the current vma,"
+ *             and a negative one means "abort current page table walk
+ *             right now." 0 means "skip the current vma."
+ * @mm:        mm_struct representing the target process of page table walk
+ * @vma:       vma currently walked (NULL if walking outside vmas)
+ * @private:   private data for callbacks' usage
  *
- * (see walk_page_range for more details)
+ * (see the comment on walk_page_range() for more details)
  */
 struct mm_walk {
         int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
@@ -1186,7 +1192,10 @@ struct mm_walk {
         int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
                              unsigned long addr, unsigned long next,
                              struct mm_walk *walk);
+        int (*test_walk)(unsigned long addr, unsigned long next,
+                        struct mm_walk *walk);
         struct mm_struct *mm;
+        struct vm_area_struct *vma;
         void *private;
 };