wait_task_stopped/continued: remove unneeded p->signal != NULL check

The child was found on ->children list under tasklist_lock, it must have a
valid ->signal. __exit_signal() both removes the task from parent->children
and clears ->signal "atomically" under write_lock(tasklist).

Remove unneeded checks.

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, 4 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index b27a3dcde671..25f6805be5fe 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1322,7 +1322,7 @@ static int wait_task_stopped(struct task_struct *p, int delayed_group_leader,
         if (!p->exit_code)
                 return 0;
         if (delayed_group_leader && !(p->ptrace & PT_PTRACED) &&
-            p->signal && p->signal->group_stop_count > 0)
+            p->signal->group_stop_count > 0)
                 /*
                  * A group stop is in progress and this is the group leader.
                  * We won't report until all threads have stopped.
@@ -1436,9 +1436,6 @@ static int wait_task_continued(struct task_struct *p, int noreap,
         pid_t pid;
         uid_t uid;
 
-        if (unlikely(!p->signal))
-                return 0;
-
         if (!(p->signal->flags & SIGNAL_STOP_CONTINUED))
                 return 0;