has_stopped_jobs: s/task_is_stopped/SIGNAL_STOP_STOPPED/

has_stopped_jobs() naively checks task_is_stopped(group_leader). This was always wrong even without ptrace, group_leader can be dead. And given that ptrace can change the state to TRACED this is wrong even in the single-threaded case.

Change the code to check SIGNAL_STOP_STOPPED and simplify the code, retval + break/continue doesn't make this trivial code more readable.

We could probably add the usual "|| signal->group_stop_count" check but I don't think this makes sense, the task can start the group-stop right after the check anyway.

---

 kernel/exit.c |   12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

@@ -266,18 +266,16 @@ int is_current_pgrp_orphaned(void)
 	return retval;
 }
 
-static int has_stopped_jobs(struct pid *pgrp)
+static bool has_stopped_jobs(struct pid *pgrp)
 {
-	int retval = 0;
 	struct task_struct *p;
 
 	do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
-		if (!task_is_stopped(p))
-			continue;
-		retval = 1;
-		break;
+		if (p->signal->flags & SIGNAL_STOP_STOPPED)
+			return true;
 	} while_each_pid_task(pgrp, PIDTYPE_PGID, p);
-	return retval;
+
+	return false;
 }
 
 /*

As for "|| signal->group_stop_count", it might be better to use the same wrapper here too for consistency if we add one.

Thank you.

tejun