diff -uNr linux-2.6.8-rc1-reboot-on-bsp/arch/i386/kernel/smp.c linux-2.6.8-rc1-flush-init-mm/arch/i386/kernel/smp.c
--- linux-2.6.8-rc1-reboot-on-bsp/arch/i386/kernel/smp.c	Wed Jul 14 16:38:26 2004
+++ linux-2.6.8-rc1-flush-init-mm/arch/i386/kernel/smp.c	Wed Jul 14 17:51:32 2004
@@ -355,7 +355,8 @@
 	BUG_ON(cpus_empty(cpumask));
 
 	cpus_and(tmp, cpumask, cpu_online_map);
-	BUG_ON(!cpus_equal(cpumask, tmp));
+	if (cpus_empty(tmp))
+		return;
 	BUG_ON(cpu_isset(smp_processor_id(), cpumask));
 	BUG_ON(!mm);
 
@@ -370,12 +371,12 @@
 	flush_mm = mm;
 	flush_va = va;
 #if NR_CPUS <= BITS_PER_LONG
-	atomic_set_mask(cpumask, &flush_cpumask);
+	atomic_set_mask(tmp, &flush_cpumask);
 #else
 	{
 		int k;
 		unsigned long *flush_mask = (unsigned long *)&flush_cpumask;
-		unsigned long *cpu_mask = (unsigned long *)&cpumask;
+		unsigned long *cpu_mask = (unsigned long *)&tmp;
 		for (k = 0; k < BITS_TO_LONGS(NR_CPUS); ++k)
 			atomic_set_mask(cpu_mask[k], &flush_mask[k]);
 	}
@@ -384,7 +385,7 @@
 	 * We have to send the IPI only to
 	 * CPUs affected.
 	 */
-	send_IPI_mask(cpumask, INVALIDATE_TLB_VECTOR);
+	send_IPI_mask(tmp, INVALIDATE_TLB_VECTOR);
 
 	while (!cpus_empty(flush_cpumask))
 		/* nothing. lockup detection does not belong here */