mm: provide a find_special_page vma operation

[mirror_ubuntu-bionic-kernel.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 80fc92a49649cf66ed87ac1343c153debd36619c..9269af7349fe0f1c2b241b5c95330c985967e0c2 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -290,6 +290,14 @@ struct vm_operations_struct {
        /* called by sys_remap_file_pages() to populate non-linear mapping */
        int (*remap_pages)(struct vm_area_struct *vma, unsigned long addr,
                           unsigned long size, pgoff_t pgoff);
+
+       /*
+        * Called by vm_normal_page() for special PTEs to find the
+        * page for @addr.  This is useful if the default behavior
+        * (using pte_page()) would not find the correct page.
+        */
+       struct page *(*find_special_page)(struct vm_area_struct *vma,
+                                         unsigned long addr);
 };
 
 struct mmu_gather;