[PATCH 4/5] do_wait: kill the old BUG_ON, use while_each_thread()

[Oleg Nesterov <oleg@redhat.com>]

do_wait() does BUG_ON(tsk->signal != current->signal), this looks like
a raher obsolete check. At least, I don't think do_wait() is the best
place to verify that all threads have the same ->signal. Remove it.

Also, change the code to use while_each_thread().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---

 kernel/exit.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- PTRACE/kernel/exit.c~4_WHILE	2009-05-07 05:09:51.000000000 +0200
+++ PTRACE/kernel/exit.c	2009-05-07 05:34:40.000000000 +0200
@@ -1595,9 +1595,7 @@ repeat:
 
 		if (wo->wo_flags & __WNOTHREAD)
 			break;
-		tsk = next_thread(tsk);
-		BUG_ON(tsk->signal != current->signal);
-	} while (tsk != current);
+	} while_each_thread(current, tsk);
 	read_unlock(&tasklist_lock);
 
 notask: