use __set_task_state() for TRACED/STOPPED tasks

1. It is much easier to grep for ->state change if __set_task_state() is used
   instead of the direct assignment.

2. ptrace_stop() and handle_group_stop() use set_task_state() which adds the
   unneeded mb() (btw even if we use mb() it is still possible that do_wait()
   sees the new ->state but not ->exit_code, but this is ok).

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
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, 1 insertions, 1 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 2b55b74cd999..8adfe5ddb688 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1510,7 +1510,7 @@ long do_fork(unsigned long clone_flags,
                 if (!(clone_flags & CLONE_STOPPED))
                         wake_up_new_task(p, clone_flags);
                 else
-                        p->state = TASK_STOPPED;
+                        __set_task_state(p, TASK_STOPPED);
 
                 if (unlikely (trace)) {
                         current->ptrace_message = nr;