job control: Small reorganization of wait_consider_task()

Move EXIT_DEAD test in wait_consider_task() above ptrace check.  As
ptraced tasks can't be EXIT_DEAD, this change doesn't cause any
behavior change.  This is to prepare for further changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>

diff --git a/kernel/exit.c b/kernel/exit.c
index f9a45ebcc7b17c30ac1d39338b75600b6287b10f..b4a935c7215966984371ca5569b3f2aecce64485 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1537,6 +1537,10 @@ static int wait_consider_task(struct wait_opts *wo, int ptrace,
                return 0;
        }
 
+       /* dead body doesn't have much to contribute */
+       if (p->exit_state == EXIT_DEAD)
+               return 0;
+
        if (likely(!ptrace) && unlikely(task_ptrace(p))) {
                /*
                 * This child is hidden by ptrace.
@@ -1546,9 +1550,6 @@ static int wait_consider_task(struct wait_opts *wo, int ptrace,
                return 0;
        }
 
-       if (p->exit_state == EXIT_DEAD)
-               return 0;
-
        /*
         * We don't reap group leaders with subthreads.
         */