2.4.20-pre1-ac1

 kernel

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.20pre1/kernel/signal.c linux.20pre1-ac1/kernel/signal.c
--- linux.20pre1/kernel/signal.c   2002-08-06 15:40:34.000000000 +0100
+++ linux.20pre1-ac1/kernel/signal.c   2002-08-06 15:41:51.000000000 +0100
@@ -492,7 +492,7 @@
  * No need to set need_resched since signal event passing
  * goes through ->blocked
  */
-static inline void signal_wake_up(struct task_struct *t)
+inline void signal_wake_up(struct task_struct *t)
 {
    t->sigpending = 1;
 
@@ -507,12 +507,9 @@
     * process of changing - but no harm is done by that
     * other than doing an extra (lightweight) IPI interrupt.
     */
-   spin_lock(&runqueue_lock);
-   if (task_has_cpu(t) && t->processor != smp_processor_id())
-      smp_send_reschedule(t->processor);
-   spin_unlock(&runqueue_lock);
-#endif /* CONFIG_SMP */
-
+   if ((t->state == TASK_RUNNING) && (t->cpu != cpu()))
+      kick_if_running(t);
+#endif
    if (t->state & TASK_INTERRUPTIBLE) {
       wake_up_process(t);
       return;