From 5c5e357704ebb0ede3501276217e0c7a6bf2a34d Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 23 Sep 2009 15:56:46 -0700
Subject: [PATCH] --- yaml --- r: 165674 b: refs/heads/master c:
 0b7570e77f7c3abd43107dabc47ea89daf9a1cba h: refs/heads/master v: v3

---
 [refs]                         |  2 +-
 trunk/kernel/exit.c            | 25 +++++++++++++++++++++----
 trunk/security/selinux/hooks.c |  2 +-
 3 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/[refs] b/[refs]
index 4282ca08d56c..a71672a23e43 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a2322e1d272938d192d8c24cdacf57c0c7a2683f
+refs/heads/master: 0b7570e77f7c3abd43107dabc47ea89daf9a1cba
diff --git a/trunk/kernel/exit.c b/trunk/kernel/exit.c
index ef2dfa818bf1..7838b4d68774 100644
--- a/trunk/kernel/exit.c
+++ b/trunk/kernel/exit.c
@@ -1097,6 +1097,7 @@ struct wait_opts {
 	int __user		*wo_stat;
 	struct rusage __user	*wo_rusage;
 
+	wait_queue_t		child_wait;
 	int			notask_error;
 };
 
@@ -1570,20 +1571,35 @@ static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk)
 	return 0;
 }
 
+static int child_wait_callback(wait_queue_t *wait, unsigned mode,
+				int sync, void *key)
+{
+	struct wait_opts *wo = container_of(wait, struct wait_opts,
+						child_wait);
+	struct task_struct *p = key;
+
+	if (!eligible_child(wo, p))
+		return 0;
+
+	return default_wake_function(wait, mode, sync, key);
+}
+
 void __wake_up_parent(struct task_struct *p, struct task_struct *parent)
 {
-	wake_up_interruptible_sync(&parent->signal->wait_chldexit);
+	__wake_up_sync_key(&parent->signal->wait_chldexit,
+				TASK_INTERRUPTIBLE, 1, p);
 }
 
 static long do_wait(struct wait_opts *wo)
 {
-	DECLARE_WAITQUEUE(wait, current);
 	struct task_struct *tsk;
 	int retval;
 
 	trace_sched_process_wait(wo->wo_pid);
 
-	add_wait_queue(&current->signal->wait_chldexit,&wait);
+	init_waitqueue_func_entry(&wo->child_wait, child_wait_callback);
+	wo->child_wait.private = current;
+	add_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);
 repeat:
 	/*
 	 * If there is nothing that can match our critiera just get out.
@@ -1624,7 +1640,8 @@ static long do_wait(struct wait_opts *wo)
 	}
 end:
 	__set_current_state(TASK_RUNNING);
-	remove_wait_queue(&current->signal->wait_chldexit,&wait);
+	remove_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);
+
 	if (wo->wo_info) {
 		struct siginfo __user *infop = wo->wo_info;
 
diff --git a/trunk/security/selinux/hooks.c b/trunk/security/selinux/hooks.c
index 417f7c994522..bb230d5d7085 100644
--- a/trunk/security/selinux/hooks.c
+++ b/trunk/security/selinux/hooks.c
@@ -2411,7 +2411,7 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
 	/* Wake up the parent if it is waiting so that it can recheck
 	 * wait permission to the new task SID. */
 	read_lock(&tasklist_lock);
-	wake_up_interruptible(&current->real_parent->signal->wait_chldexit);
+	__wake_up_parent(current, current->real_parent);
 	read_unlock(&tasklist_lock);
 }