4 files changed, 4 insertions, 5 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 4121bb559739..3a79d97ac234 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -712,7 +712,7 @@ static int de_thread(struct task_struct *tsk)
                 attach_pid(current, PIDTYPE_PID,  current->pid);
                 attach_pid(current, PIDTYPE_PGID, current->signal->pgrp);
                 attach_pid(current, PIDTYPE_SID,  current->signal->session);
-                list_add_tail(&current->tasks, &init_task.tasks);
+                list_add_tail_rcu(&current->tasks, &init_task.tasks);
 
                 current->group_leader = current;
                 leader->group_leader = current;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index b7d31e2e1729..29b7d4f87d20 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1192,8 +1192,7 @@ extern void wait_task_inactive(task_t * p);
 #define remove_parent(p)        list_del_init(&(p)->sibling)
 #define add_parent(p)           list_add_tail(&(p)->sibling,&(p)->parent->children)
 
-#define next_task(p)    list_entry((p)->tasks.next, struct task_struct, tasks)
-#define prev_task(p)    list_entry((p)->tasks.prev, struct task_struct, tasks)
+#define next_task(p)    list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
 
 #define for_each_process(p) \
         for (p = &init_task ; (p = next_task(p)) != &init_task ; )
diff --git a/kernel/exit.c b/kernel/exit.c
index 1a9787ac6173..f86434d7b3d1 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -56,7 +56,7 @@ static void __unhash_process(struct task_struct *p)
                 detach_pid(p, PIDTYPE_PGID);
                 detach_pid(p, PIDTYPE_SID);
 
-                list_del_init(&p->tasks);
+                list_del_rcu(&p->tasks);
                 __get_cpu_var(process_counts)--;
         }
         list_del_rcu(&p->thread_group);
diff --git a/kernel/fork.c b/kernel/fork.c
index 54b15f8cda53..34515772611e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1204,7 +1204,7 @@ static task_t *copy_process(unsigned long clone_flags,
                         attach_pid(p, PIDTYPE_PGID, process_group(p));
                         attach_pid(p, PIDTYPE_SID, p->signal->session);
 
-                        list_add_tail(&p->tasks, &init_task.tasks);
+                        list_add_tail_rcu(&p->tasks, &init_task.tasks);
                         __get_cpu_var(process_counts)++;
                 }
                 attach_pid(p, PIDTYPE_PID, p->pid);