diff --git a/kernel/fork.c b/kernel/fork.c
index bab3419..f252784 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -973,7 +973,6 @@
 					unsigned long stack_start,
 					struct pt_regs *regs,
 					unsigned long stack_size,
-					int __user *parent_tidptr,
 					int __user *child_tidptr,
 					struct pid *pid)
 {
@@ -1043,11 +1042,6 @@
 	p->did_exec = 0;
 	delayacct_tsk_init(p);	/* Must remain after dup_task_struct() */
 	copy_flags(clone_flags, p);
-	retval = -EFAULT;
-	if (clone_flags & CLONE_PARENT_SETTID)
-		if (put_user(p->pid, parent_tidptr))
-			goto bad_fork_cleanup_delays_binfmt;
-
 	INIT_LIST_HEAD(&p->children);
 	INIT_LIST_HEAD(&p->sibling);
 	p->vfork_done = NULL;
@@ -1289,11 +1283,22 @@
 			__ptrace_link(p, current->parent);
 
 		if (thread_group_leader(p)) {
-			p->signal->tty = current->signal->tty;
-			p->signal->pgrp = task_pgrp_nr(current);
-			set_task_session(p, task_session_nr(current));
-			attach_pid(p, PIDTYPE_PGID, task_pgrp(current));
-			attach_pid(p, PIDTYPE_SID, task_session(current));
+			if (clone_flags & CLONE_NEWPID) {
+				p->nsproxy->pid_ns->child_reaper = p;
+				p->signal->tty = NULL;
+				p->signal->pgrp = p->pid;
+				set_task_session(p, p->pid);
+				attach_pid(p, PIDTYPE_PGID, pid);
+				attach_pid(p, PIDTYPE_SID, pid);
+			} else {
+				p->signal->tty = current->signal->tty;
+				p->signal->pgrp = task_pgrp_nr(current);
+				set_task_session(p, task_session_nr(current));
+				attach_pid(p, PIDTYPE_PGID,
+						task_pgrp(current));
+				attach_pid(p, PIDTYPE_SID,
+						task_session(current));
+			}
 
 			list_add_tail_rcu(&p->tasks, &init_task.tasks);
 			__get_cpu_var(process_counts)++;
@@ -1339,7 +1344,6 @@
 bad_fork_cleanup_cgroup:
 #endif
 	cgroup_exit(p, cgroup_callbacks_done);
-bad_fork_cleanup_delays_binfmt:
 	delayacct_tsk_free(p);
 	if (p->binfmt)
 		module_put(p->binfmt->module);
@@ -1366,7 +1370,7 @@
 	struct task_struct *task;
 	struct pt_regs regs;
 
-	task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL, NULL,
+	task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL,
 				&init_struct_pid);
 	if (!IS_ERR(task))
 		init_idle(task, cpu);
@@ -1414,7 +1418,7 @@
 	}
 
 	p = copy_process(clone_flags, stack_start, regs, stack_size,
-			parent_tidptr, child_tidptr, NULL);
+			child_tidptr, NULL);
 	/*
 	 * Do this prior waking up the new thread - the thread pointer
 	 * might get invalid after that point, if the thread exits quickly.
@@ -1422,7 +1426,16 @@
 	if (!IS_ERR(p)) {
 		struct completion vfork;
 
-		nr = pid_nr(task_pid(p));
+		/*
+		 * this is enough to call pid_nr_ns here, but this if
+		 * improves optimisation of regular fork()
+		 */
+		nr = (clone_flags & CLONE_NEWPID) ?
+			task_pid_nr_ns(p, current->nsproxy->pid_ns) :
+				task_pid_vnr(p);
+
+		if (clone_flags & CLONE_PARENT_SETTID)
+			put_user(nr, parent_tidptr);
 
 		if (clone_flags & CLONE_VFORK) {
 			p->vfork_done = &vfork;