1 files changed, 5 insertions, 1 deletions

diff --git a/include/linux/sem.h b/include/linux/sem.h
index d42599395d79..1b191c176bcd 100644
--- a/include/linux/sem.h
+++ b/include/linux/sem.h
@@ -78,6 +78,7 @@ struct  seminfo {
 
 #ifdef __KERNEL__
 #include <asm/atomic.h>
+#include <linux/rcupdate.h>
 
 struct task_struct;
 
@@ -114,7 +115,10 @@ struct sem_queue {
  * when the process exits.
  */
 struct sem_undo {
-        struct list_head        list_proc;      /* per-process list: all undos from one process */
+        struct list_head        list_proc;      /* per-process list: all undos from one process. */
+                                                /* rcu protected */
+        struct rcu_head         rcu;            /* rcu struct for sem_undo() */
+        struct sem_undo_list    *ulp;           /* sem_undo_list for the process */
         struct list_head        list_id;        /* per semaphore array list: all undos for one array */
         int                     semid;          /* semaphore set identifier */
         short *                 semadj;         /* array of adjustments, one per semaphore */