wait_task_zombie: remove unneeded child->signal check

A zombie must have a valid ->signal, we are going to release it and
__exit_signal() starts with BUG_ON(!sig).

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/exit.c b/kernel/exit.c
index 8b64c0371ae959d95a28ec4dc83637693b5f0fe5..9d6e0897a4476dac387116af94aa721f06183219 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1201,7 +1201,7 @@ static int wait_task_zombie(struct task_struct *p, int noreap,
                return 0;
        }
 
-       if (likely(p->real_parent == p->parent) && likely(p->signal)) {
+       if (likely(p->real_parent == p->parent)) {
                struct signal_struct *psig;
                struct signal_struct *sig;