wait_task_stopped(): remove unneeded delay_group_leader check

wait_task_stopped() doesn't need the "delay_group_leader" parameter.  If
the child is not traced it must be a group leader.  With or without
subthreads ->group_stop_count == 0 when the whole task is stopped.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Mika Penttila <mika.penttila@kolumbus.fi>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 723a69b69fa1..190a4cdcdb4d 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1351,7 +1351,7 @@ static int wait_task_zombie(struct task_struct *p, int noreap,
  * the lock and this task is uninteresting.  If we return nonzero, we have
  * released the lock and the system call should return.
  */
-static int wait_task_stopped(struct task_struct *p, int delayed_group_leader,
+static int wait_task_stopped(struct task_struct *p,
                              int noreap, struct siginfo __user *infop,
                              int __user *stat_addr, struct rusage __user *ru)
 {
@@ -1365,8 +1365,7 @@ static int wait_task_stopped(struct task_struct *p, int delayed_group_leader,
         if (unlikely(!task_is_stopped_or_traced(p)))
                 goto unlock_sig;
 
-        if (delayed_group_leader && !(p->ptrace & PT_PTRACED) &&
-            p->signal->group_stop_count > 0)
+        if (!(p->ptrace & PT_PTRACED) && p->signal->group_stop_count > 0)
                 /*
                  * A group stop is in progress and this is the group leader.
                  * We won't report until all threads have stopped.
@@ -1522,7 +1521,7 @@ repeat:
                                     !(options & WUNTRACED))
                                         continue;
 
-                                retval = wait_task_stopped(p, ret == 2,
+                                retval = wait_task_stopped(p,
                                                 (options & WNOWAIT), infop,
                                                 stat_addr, ru);
                         } else if (p->exit_state == EXIT_ZOMBIE) {