diff -urNp 2.4.21pre5/include/linux/sched.h x/include/linux/sched.h
--- 2.4.21pre5/include/linux/sched.h	2003-02-27 08:15:41.000000000 +0100
+++ x/include/linux/sched.h	2003-03-11 20:02:57.000000000 +0100
@@ -163,12 +163,6 @@ extern void flush_scheduled_tasks(void);
 extern int start_context_thread(void);
 extern int current_is_keventd(void);
 
-#if CONFIG_SMP
-extern void set_cpus_allowed(struct task_struct *p, unsigned long new_mask);
-#else
-# define set_cpus_allowed(p, new_mask) do { } while (0)
-#endif
-
 /*
  * The default fd array needs to be at least BITS_PER_LONG,
  * as this is the granularity returned by copy_fdset().
diff -urNp 2.4.21pre5/kernel/ksyms.c x/kernel/ksyms.c
--- 2.4.21pre5/kernel/ksyms.c	2003-02-27 08:15:43.000000000 +0100
+++ x/kernel/ksyms.c	2003-03-11 20:02:57.000000000 +0100
@@ -452,9 +452,6 @@ EXPORT_SYMBOL(interruptible_sleep_on);
 EXPORT_SYMBOL(interruptible_sleep_on_timeout);
 EXPORT_SYMBOL(schedule);
 EXPORT_SYMBOL(schedule_timeout);
-#if CONFIG_SMP
-EXPORT_SYMBOL(set_cpus_allowed);
-#endif
 EXPORT_SYMBOL(yield);
 EXPORT_SYMBOL(__cond_resched);
 EXPORT_SYMBOL(jiffies);
diff -urNp 2.4.21pre5/kernel/sched.c x/kernel/sched.c
--- 2.4.21pre5/kernel/sched.c	2003-02-27 08:15:43.000000000 +0100
+++ x/kernel/sched.c	2003-03-11 20:02:57.000000000 +0100
@@ -850,44 +850,6 @@ long sleep_on_timeout(wait_queue_head_t 
 
 void scheduling_functions_end_here(void) { }
 
-#if CONFIG_SMP
-/**
- * set_cpus_allowed() - change a given task's processor affinity
- * @p: task to bind
- * @new_mask: bitmask of allowed processors
- *
- * Upon return, the task is running on a legal processor.  Note the caller
- * must have a valid reference to the task: it must not exit() prematurely.
- * This call can sleep; do not hold locks on call.
- */
-void set_cpus_allowed(struct task_struct *p, unsigned long new_mask)
-{
-	new_mask &= cpu_online_map;
-	BUG_ON(!new_mask);
-
-	p->cpus_allowed = new_mask;
-
-	/*
-	 * If the task is on a no-longer-allowed processor, we need to move
-	 * it.  If the task is not current, then set need_resched and send
-	 * its processor an IPI to reschedule.
-	 */
-	if (!(p->cpus_runnable & p->cpus_allowed)) {
-		if (p != current) {
-			p->need_resched = 1;
-			smp_send_reschedule(p->processor);
-		}
-		/*
-		 * Wait until we are on a legal processor.  If the task is
-		 * current, then we should be on a legal processor the next
-		 * time we reschedule.  Otherwise, we need to wait for the IPI.
-		 */
-		while (!(p->cpus_runnable & p->cpus_allowed))
-			schedule();
-	}
-}
-#endif /* CONFIG_SMP */
-
 #ifndef __alpha__
 
 /*