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/signal.c b/kernel/signal.c
index 6a5f97cd337a..e46971560fcb 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1601,7 +1601,7 @@ static void ptrace_stop(int exit_code, int nostop_code, siginfo_t *info)
         current->exit_code = exit_code;
 
         /* Let the debugger run.  */
-        set_current_state(TASK_TRACED);
+        __set_current_state(TASK_TRACED);
         spin_unlock_irq(&current->sighand->siglock);
         try_to_freeze();
         read_lock(&tasklist_lock);