tracehook: fix SA_NOCLDWAIT

I outwitted myself again in commit 2b2a1ff64afbadac842bbc58c5166962cf4f7664,
and broke the SA_NOCLDWAIT behavior so it leaks zombies.  This fixes it.

Reported-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Roland McGrath <roland@redhat.com>

diff --git a/kernel/signal.c b/kernel/signal.c
index c539f60c6f41bc2b9e170b93bf66a8bca5e93ce3..e661b01d340f06a17afb6cfef13a712ae0338ff9 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1338,6 +1338,7 @@ int do_notify_parent(struct task_struct *tsk, int sig)
        struct siginfo info;
        unsigned long flags;
        struct sighand_struct *psig;
+       int ret = sig;
 
        BUG_ON(sig == -1);
 
@@ -1402,7 +1403,7 @@ int do_notify_parent(struct task_struct *tsk, int sig)
                 * is implementation-defined: we do (if you don't want
                 * it, just use SIG_IGN instead).
                 */
-               tsk->exit_signal = -1;
+               ret = tsk->exit_signal = -1;
                if (psig->action[SIGCHLD-1].sa.sa_handler == SIG_IGN)
                        sig = -1;
        }
@@ -1411,7 +1412,7 @@ int do_notify_parent(struct task_struct *tsk, int sig)
        __wake_up_parent(tsk, tsk->parent);
        spin_unlock_irqrestore(&psig->siglock, flags);
 
-       return sig;
+       return ret;
 }
 
 static void do_notify_parent_cldstop(struct task_struct *tsk, int why)