1 files changed, 25 insertions, 0 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 67f0ab9077d9..0e4eea10c7b0 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -993,6 +993,30 @@ unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
                 tlb_finish_mmu(tlb, address, end);
         return end;
 }
+EXPORT_SYMBOL_GPL(zap_page_range);
+
+/**
+ * zap_vma_ptes - remove ptes mapping the vma
+ * @vma: vm_area_struct holding ptes to be zapped
+ * @address: starting address of pages to zap
+ * @size: number of bytes to zap
+ *
+ * This function only unmaps ptes assigned to VM_PFNMAP vmas.
+ *
+ * The entire address range must be fully contained within the vma.
+ *
+ * Returns 0 if successful.
+ */
+int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
+                unsigned long size)
+{
+        if (address < vma->vm_start || address + size > vma->vm_end ||
+                        !(vma->vm_flags & VM_PFNMAP))
+                return -1;
+        zap_page_range(vma, address, size, NULL);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(zap_vma_ptes);
 
 /*
  * Do a quick page-table lookup for a single page.
@@ -1087,6 +1111,7 @@ no_page_table:
         }
         return page;
 }
+EXPORT_SYMBOL_GPL(follow_page);
 
 /* Can we do the FOLL_ANON optimization? */
 static inline int use_zero_page(struct vm_area_struct *vma)