[RFC][Patch] fix for irq_affinity_write_proc v2.5

[Keith Mannthey]

Hello,
  irq_affinity_write_proc currently directly calls set_ioapic_affinity
which writes to the ioapic.  This undermines the work done by kirqd by
writing a cpu mask directly to the ioapic. I propose the following patch
to tie the /proc affinity writes into the same code path as kirqd. 
Kirqd will enforce the affinity requested by the user.   

Keith Mannthey

diff -urN linux-2.5.68/arch/i386/kernel/irq.c linux-2.5.68-procfix/arch/i386/kernel/irq.c
--- linux-2.5.68/arch/i386/kernel/irq.c	Sat Apr 19 19:48:50 2003
+++ linux-2.5.68-procfix/arch/i386/kernel/irq.c	Thu May  8 13:47:38 2003
@@ -871,8 +871,11 @@
 		return -EINVAL;
 
 	irq_affinity[irq] = new_value;
-	irq_desc[irq].handler->set_affinity(irq, new_value);
-
+	if (irqbalance_disabled)
+		irq_desc[irq].handler->set_affinity(irq, new_value);
+	else
+		do_irq_balance();
+	
 	return full_count;
 }