[PATCH 3/4] pids: __set_special_pids: use change_pid() helper

[Oleg Nesterov]

Use change_pid() instead of detach_pid() + attach_pid() in __set_special_pids()

This way task_session() is not NULL in between.

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>

--- 25/kernel/exit.c~4_SETSID	2008-03-16 19:41:42.000000000 +0300
+++ 25/kernel/exit.c	2008-03-20 18:25:11.000000000 +0300
@@ -334,13 +334,11 @@ void __set_special_pids(struct pid *pid)
 	pid_t nr = pid_nr(pid);
 
 	if (task_session(curr) != pid) {
-		detach_pid(curr, PIDTYPE_SID);
-		attach_pid(curr, PIDTYPE_SID, pid);
+		change_pid(curr, PIDTYPE_SID, pid);
 		set_task_session(curr, nr);
 	}
 	if (task_pgrp(curr) != pid) {
-		detach_pid(curr, PIDTYPE_PGID);
-		attach_pid(curr, PIDTYPE_PGID, pid);
+		change_pid(curr, PIDTYPE_PGID, pid);
 		set_task_pgrp(curr, nr);
 	}
 }

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