[PATCH] restore ->pdeath_signal behaviour

Commit b2b2cbc4b2a2f389442549399a993a8306420baf introduced a user-
visible change: ->pdeath_signal is sent only when the entire thread
group exits.

While this change is imho good, it may break things.  So restore the
old behaviour for now.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
To: Albert Cahalan <acahalan@gmail.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@osdl.org>
Cc: Linus Torvalds <torvalds@osdl.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Qi Yong <qiyong@fc-cn.com>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/kernel/exit.c b/kernel/exit.c
index 46cf6b6814605fc1fa83871ce30cb0763d74ef99..35401720635b4df01afe542c655ba350ac13d6a2 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -597,6 +597,10 @@ choose_new_parent(struct task_struct *p, struct task_struct *reaper)
 static void
 reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
 {
+       if (p->pdeath_signal)
+               /* We already hold the tasklist_lock here.  */
+               group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
+
        /* Move the child from its dying parent to the new one.  */
        if (unlikely(traced)) {
                /* Preserve ptrace links if someone else is tracing this child.  */
@@ -631,10 +635,6 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
        /* We don't want people slaying init.  */
        if (p->exit_signal != -1)
                p->exit_signal = SIGCHLD;
-               
-       if (p->pdeath_signal)
-               /* We already hold the tasklist_lock here.  */
-               group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
 
        /* If we'd notified the old parent about this child's death,
         * also notify the new parent.