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>

diff --git a/kernel/exit.c b/kernel/exit.c
index b27a3dcde6713e5716924e567d4c6e472aaa7419..25f6805be5fe39114f528fb00b4bccb2c8acac5e 100644 (file)
--- 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;