1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 07a7a4102f05..e7baabffee86 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -386,7 +386,15 @@ struct raid5_private_data {
         /* per cpu variables */
         struct raid5_percpu {
                 struct page     *spare_page; /* Used when checking P/Q in raid6 */
+                void            *scribble;   /* space for constructing buffer
+                                              * lists and performing address
+                                              * conversions
+                                              */
         } *percpu;
+        size_t                  scribble_len; /* size of scribble region must be
+                                               * associated with conf to handle
+                                               * cpu hotplug while reshaping
+                                               */
 #ifdef CONFIG_HOTPLUG_CPU
         struct notifier_block   cpu_notify;
 #endif