x86, legacy_irq: Remove left over nr_legacy_irqs

nr_legacy_irqs and its ilk have moved to legacy_pic.

-v2: there is one in ioapic_.c
Singed-off-by: NYinghai Lu <yinghai@kernel.org>
LKML-Reference: <4B84AAC4.2020204@kernel.org>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

arch/x86/include/asm/irq.h

@@ -48,6 +48,5 @@ extern DECLARE_BITMAP(used_vectors, NR_VECTORS);
 extern int vector_used_by_percpu_irq(unsigned int vector);
 
 extern void init_ISA_irqs(void);
-extern int nr_legacy_irqs;
 
 #endif /* _ASM_X86_IRQ_H */

arch/x86/kernel/apic/io_apic.c

@@ -1440,7 +1440,7 @@ static void setup_IO_APIC_irq(int apic_id, int pin, unsigned int irq, struct irq
 	 * controllers like 8259. Now that IO-APIC can handle this irq, update
 	 * the cfg->domain.
 	 */
-	if (irq < nr_legacy_irqs && cpumask_test_cpu(0, cfg->domain))
+	if (irq < legacy_pic->nr_legacy_irqs && cpumask_test_cpu(0, cfg->domain))
 		apic->vector_allocation_domain(0, cfg->domain);
 
 	if (assign_irq_vector(irq, cfg, apic->target_cpus()))

arch/x86/kernel/irqinit.c

@@ -99,9 +99,6 @@ int vector_used_by_percpu_irq(unsigned int vector)
 	return 0;
 }
 
-/* Number of legacy interrupts */
-int nr_legacy_irqs __read_mostly = NR_IRQS_LEGACY;
-
 void __init init_ISA_irqs(void)
 {
 	int i;
@@ -114,7 +111,7 @@ void __init init_ISA_irqs(void)
 	/*
 	 * 16 old-style INTA-cycle interrupts:
 	 */
-	for (i = 0; i < NR_IRQS_LEGACY; i++) {
+	for (i = 0; i < legacy_pic->nr_legacy_irqs; i++) {
 		struct irq_desc *desc = irq_to_desc(i);
 
 		desc->status = IRQ_DISABLED;
@@ -138,7 +135,7 @@ void __init init_IRQ(void)
 	 * then this vector space can be freed and re-used dynamically as the
 	 * irq's migrate etc.
 	 */
-	for (i = 0; i < nr_legacy_irqs; i++)
+	for (i = 0; i < legacy_pic->nr_legacy_irqs; i++)
 		per_cpu(vector_irq, 0)[IRQ0_VECTOR + i] = i;
 
 	x86_init.irqs.intr_init();