um: migrate from __do_IRQ() to generic_handle_irq()

This patch removes __do_IRQ() from user mode linux.  __do_IRQ is deprecated.
Signed-off-by: NRichard Weinberger <richard@nod.at>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/um/Kconfig.um

@@ -120,6 +120,9 @@ config SMP
 
 	  If you don't know what to do, say N.
 
+config GENERIC_HARDIRQS_NO__DO_IRQ
+	def_bool y
+
 config NR_CPUS
 	int "Maximum number of CPUs (2-32)"
 	range 2 32

arch/um/kernel/irq.c

@@ -334,7 +334,7 @@ unsigned int do_IRQ(int irq, struct uml_pt_regs *regs)
 {
 	struct pt_regs *old_regs = set_irq_regs((struct pt_regs *)regs);
 	irq_enter();
-	__do_IRQ(irq);
+	generic_handle_irq(irq);
 	irq_exit();
 	set_irq_regs(old_regs);
 	return 1;
@@ -391,17 +391,10 @@ void __init init_IRQ(void)
 {
 	int i;
 
-	irq_desc[TIMER_IRQ].status = IRQ_DISABLED;
-	irq_desc[TIMER_IRQ].action = NULL;
-	irq_desc[TIMER_IRQ].depth = 1;
-	irq_desc[TIMER_IRQ].chip = &SIGVTALRM_irq_type;
-	enable_irq(TIMER_IRQ);
+	set_irq_chip_and_handler(TIMER_IRQ, &SIGVTALRM_irq_type, handle_edge_irq);
+
 	for (i = 1; i < NR_IRQS; i++) {
-		irq_desc[i].status = IRQ_DISABLED;
-		irq_desc[i].action = NULL;
-		irq_desc[i].depth = 1;
-		irq_desc[i].chip = &normal_irq_type;
-		enable_irq(i);
+		set_irq_chip_and_handler(i, &normal_irq_type, handle_edge_irq);
 	}
 }