ptrace: wait_consider_task: s/same_thread_group/ptrace_reparented/

wait_consider_task() checks same_thread_group(parent, real_parent),
this is the open-coded ptrace_reparented().

__ptrace_detach() remains the only function which has to check this by
hand, although we could reorganize the code to delay __ptrace_unlink.

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

diff --git a/kernel/exit.c b/kernel/exit.c
index 9fa9970..b8d3b47 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1599,8 +1599,7 @@ static int wait_consider_task(struct wait_opts *wo, int ptrace,
                 * own children, it should create a separate process which
                 * takes the role of real parent.
                 */
-               if (likely(!ptrace) && p->ptrace &&
-                   same_thread_group(p->parent, p->real_parent))
+               if (likely(!ptrace) && p->ptrace && !ptrace_reparented(p))
                        return 0;
 
                /*