From 60667af125cb2dc434c11e1633291ce27eecb7f8 Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Mon, 26 Jun 2006 00:26:08 -0700
Subject: [PATCH] --- yaml --- r: 30266 b: refs/heads/master c:
 7b1c6154fa8bb937e0b1b4f2adbb315d70270f10 h: refs/heads/master v: v3

---
 [refs]          |  2 +-
 trunk/fs/exec.c | 12 ++++++++----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/[refs] b/[refs]
index 2aff974f74a1..96bbae2ad5c0 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d5f70c00ad24cd1158d3678b44ff969b4c971d49
+refs/heads/master: 7b1c6154fa8bb937e0b1b4f2adbb315d70270f10
diff --git a/trunk/fs/exec.c b/trunk/fs/exec.c
index b58ba7d127e0..49fa0127a330 100644
--- a/trunk/fs/exec.c
+++ b/trunk/fs/exec.c
@@ -1373,7 +1373,11 @@ static void zap_process(struct task_struct *start)
 	struct task_struct *t;
 	unsigned long flags;
 
-	spin_lock_irqsave(&start->sighand->siglock, flags);
+	/*
+	 * start->sighand can't disappear, but may be
+	 * changed by de_thread()
+	 */
+	lock_task_sighand(start, &flags);
 	start->signal->flags = SIGNAL_GROUP_EXIT;
 	start->signal->group_stop_count = 0;
 
@@ -1386,7 +1390,7 @@ static void zap_process(struct task_struct *start)
 		}
 	} while ((t = next_thread(t)) != start);
 
-	spin_unlock_irqrestore(&start->sighand->siglock, flags);
+	unlock_task_sighand(start, &flags);
 }
 
 static void zap_threads(struct mm_struct *mm)
@@ -1404,7 +1408,7 @@ static void zap_threads(struct mm_struct *mm)
 		complete(vfork_done);
 	}
 
-	read_lock(&tasklist_lock);
+	rcu_read_lock();
 	for_each_process(g) {
 		p = g;
 		do {
@@ -1415,7 +1419,7 @@ static void zap_threads(struct mm_struct *mm)
 			}
 		} while ((p = next_thread(p)) != g);
 	}
-	read_unlock(&tasklist_lock);
+	rcu_read_unlock();
 }
 
 static void coredump_wait(struct mm_struct *mm)