mm: fix fault vs invalidate race for linear mappings

[deliverable/linux.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index a5c451816fdca003350570aa3139e2f32fbe45f9..ca9536a348c85a025c08144443f7307019c85aa5 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -168,6 +168,12 @@ extern unsigned int kobjsize(const void *objp);
 #define VM_INSERTPAGE  0x02000000      /* The vma has had "vm_insert_page()" done on it */
 #define VM_ALWAYSDUMP  0x04000000      /* Always include in core dumps */
 
+#define VM_CAN_INVALIDATE 0x08000000   /* The mapping may be invalidated,
+                                        * eg. truncate or invalidate_inode_*.
+                                        * In this case, do_no_page must
+                                        * return with the page locked.
+                                        */
+
 #ifndef VM_STACK_DEFAULT_FLAGS         /* arch can override this */
 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
 #endif