[PATCH] alpha irq proc update

From Jeff.Wiedemeier@hp.com:

- Only create smp_affinity /proc nodes if a set_affinity handler
  is provided.
- Limit the number of irq nodes that will be created in /proc
  to avoid overfilling the /proc inode space.

arch/alpha/kernel/irq.c

@@ -362,6 +362,7 @@ register_irq_proc (unsigned int irq)
 	irq_dir[irq] = proc_mkdir(name, root_irq_dir);
 
 #ifdef CONFIG_SMP 
+	if (irq_desc[irq].handler->set_affinity) {
 		/* create /proc/irq/1234/smp_affinity */
 		entry = create_proc_entry("smp_affinity", 0600, irq_dir[irq]);
 
@@ -371,6 +372,7 @@ register_irq_proc (unsigned int irq)
 		entry->write_proc = irq_affinity_write_proc;
 
 		smp_affinity_entry[irq] = entry;
+	}
 #endif
 }
 
@@ -398,13 +400,17 @@ init_irq_proc (void)
 #endif
 
 	/*
-	 * Create entries for all existing IRQs.
+	 * Create entries for all existing IRQs. If the number of IRQs
+	 * is greater the 1/4 the total dynamic inode space for /proc,
+	 * don't pollute the inode space
 	 */
-	for (i = 0; i < NR_IRQS; i++) {
+	if (ACTUAL_NR_IRQS < (PROC_NDYNAMIC / 4)) {
+		for (i = 0; i < ACTUAL_NR_IRQS; i++) {
 			if (irq_desc[i].handler == &no_irq_type)
 				continue;
 			register_irq_proc(i);
 		}
+	}
 }
 
 int
@@ -518,7 +524,7 @@ show_interrupts(struct seq_file *p, void *v)
 	seq_putc(p, '\n');
 #endif
 
-	for (i = 0; i < NR_IRQS; i++) {
+	for (i = 0; i < ACTUAL_NR_IRQS; i++) {
 		action = irq_desc[i].action;
 		if (!action) 
 			continue;