2 files changed, 22 insertions, 0 deletions

diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index d4b2f1c76e12..243e287304d0 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -103,6 +103,12 @@ extern struct group_info init_groups;
                 { .first = &init_task.pids[PIDTYPE_SID].node },         \
         },                                                              \
         .rcu            = RCU_HEAD_INIT,                                \
+        .level          = 0,                                            \
+        .numbers        = { {                                           \
+                .nr             = 0,                                    \
+                .ns             = &init_pid_ns,                         \
+                .pid_chain      = { .next = NULL, .pprev = NULL },      \
+        }, }                                                            \
 }
 
 #define INIT_PID_LINK(type)                                     \
diff --git a/include/linux/pid.h b/include/linux/pid.h
index 1e0e4e3423a6..e5865a9c58a6 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -40,6 +40,20 @@ enum pid_type
  * processes.
  */
 
+
+/*
+ * struct upid is used to get the id of the struct pid, as it is
+ * seen in particular namespace. Later the struct pid is found with
+ * find_pid_ns() using the int nr and struct pid_namespace *ns.
+ */
+
+struct upid {
+        /* Try to keep pid_chain in the same cacheline as nr for find_pid */
+        int nr;
+        struct pid_namespace *ns;
+        struct hlist_node pid_chain;
+};
+
 struct pid
 {
         atomic_t count;
@@ -49,6 +63,8 @@ struct pid
         /* lists of tasks that use this pid */
         struct hlist_head tasks[PIDTYPE_MAX];
         struct rcu_head rcu;
+        int level;
+        struct upid numbers[1];
 };
 
 extern struct pid init_struct_pid;