Kill some obsolete sub-thread-ptrace stuff

There is a couple of subtle checks which were needed to handle ptracing from
the same thread group. This was deprecated a long ago, imho this code just
complicates the understanding.

And, the "->parent->signal->flags & SIGNAL_GROUP_EXIT" check in exit_notify()
is not right. SIGNAL_GROUP_EXIT can mean exec(), not exit_group(). This means
ptracer can lose a ptraced zombie on exec(). Minor problem, but still the bug.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/exit.c b/kernel/exit.c
index 464c2b1..9578c1a 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -813,7 +813,7 @@
 		__kill_pgrp_info(SIGCONT, SEND_SIG_PRIV, pgrp);
 	}
 
-	/* Let father know we died 
+	/* Let father know we died
 	 *
 	 * Thread signals are configurable, but you aren't going to use
 	 * that to send signals to arbitary processes. 
@@ -826,9 +826,7 @@
 	 * If our self_exec id doesn't match our parent_exec_id then
 	 * we have changed execution domain as these two values started
 	 * the same after a fork.
-	 *	
 	 */
-	
 	if (tsk->exit_signal != SIGCHLD && tsk->exit_signal != -1 &&
 	    ( tsk->parent_exec_id != t->self_exec_id  ||
 	      tsk->self_exec_id != tsk->parent_exec_id)
@@ -848,9 +846,7 @@
 	}
 
 	state = EXIT_ZOMBIE;
-	if (tsk->exit_signal == -1 &&
-	    (likely(tsk->ptrace == 0) ||
-	     unlikely(tsk->parent->signal->flags & SIGNAL_GROUP_EXIT)))
+	if (tsk->exit_signal == -1 && likely(!tsk->ptrace))
 		state = EXIT_DEAD;
 	tsk->exit_state = state;