memcg, slab: clean up memcg cache initialization/destruction

[platform/adaptation/renesas_rcar/renesas_kernel.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index 7049ae5..2f11bbe 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1035,6 +1035,11 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
        sig->nr_threads = 1;
        atomic_set(&sig->live, 1);
        atomic_set(&sig->sigcnt, 1);
+
+       /* list_add(thread_node, thread_head) without INIT_LIST_HEAD() */
+       sig->thread_head = (struct list_head)LIST_HEAD_INIT(tsk->thread_node);
+       tsk->thread_node = (struct list_head)LIST_HEAD_INIT(sig->thread_head);
+
        init_waitqueue_head(&sig->wait_chldexit);
        sig->curr_target = tsk;
        init_sigpending(&sig->shared_pending);
@@ -1090,6 +1095,7 @@ static void rt_mutex_init_task(struct task_struct *p)
        p->pi_waiters = RB_ROOT;
        p->pi_waiters_leftmost = NULL;
        p->pi_blocked_on = NULL;
+       p->pi_top_task = NULL;
 #endif
 }
 
@@ -1173,7 +1179,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         * do not allow it to share a thread group or signal handlers or
         * parent with the forking task.
         */
-       if (clone_flags & (CLONE_SIGHAND | CLONE_PARENT)) {
+       if (clone_flags & CLONE_SIGHAND) {
                if ((clone_flags & (CLONE_NEWUSER | CLONE_NEWPID)) ||
                    (task_active_pid_ns(current) !=
                                current->nsproxy->pid_ns_for_children))
@@ -1473,6 +1479,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                        atomic_inc(&current->signal->sigcnt);
                        list_add_tail_rcu(&p->thread_group,
                                          &p->group_leader->thread_group);
+                       list_add_tail_rcu(&p->thread_node,
+                                         &p->signal->thread_head);
                }
                attach_pid(p, PIDTYPE_PID);
                nr_threads++;