x86, irq: Count legacy IRQs by legacy_pic->nr_legacy_irqs instead of NR_IRQS_LEGACY

Some platforms, such as Intel MID and mshypv, do not support legacy
interrupt controllers. So count legacy IRQs by legacy_pic->nr_legacy_irqs
instead of hard-coded NR_IRQS_LEGACY.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: xen-devel@lists.xenproject.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Len Brown <len.brown@intel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Tony Lindgren <tony@atomide.com>
Acked-by: David Vrabel <david.vrabel@citrix.com>
Link: http://lkml.kernel.org/r/1402302011-23642-20-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 7 insertions, 6 deletions

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 7db54b5d5f86..b4680058db8b 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -21,6 +21,7 @@
 #include <asm/apic.h>
 #include <asm/pci_x86.h>
 #include <asm/setup.h>
+#include <asm/i8259.h>
 
 __initdata u64 initial_dtb;
 char __initdata cmd_line[COMMAND_LINE_SIZE];
@@ -314,7 +315,7 @@ static void dt_add_ioapic_domain(unsigned int ioapic_num,
 	struct irq_domain *id;
 	struct mp_ioapic_gsi *gsi_cfg;
 	int ret;
-	int num;
+	int num, legacy_irqs = nr_legacy_irqs();
 
 	gsi_cfg = mp_ioapic_gsi_routing(ioapic_num);
 	num = gsi_cfg->gsi_end - gsi_cfg->gsi_base + 1;
@@ -324,17 +325,17 @@ static void dt_add_ioapic_domain(unsigned int ioapic_num,
 	BUG_ON(!id);
 	if (gsi_cfg->gsi_base == 0) {
 		/*
-		 * The first NR_IRQS_LEGACY irq descs are allocated in
+		 * The first nr_legacy_irqs() irq descs are allocated in
 		 * early_irq_init() and need just a mapping. The
 		 * remaining irqs need both. All of them are preallocated
 		 * and assigned so we can keep the 1:1 mapping which the ioapic
 		 * is having.
 		 */
-		irq_domain_associate_many(id, 0, 0, NR_IRQS_LEGACY);
+		irq_domain_associate_many(id, 0, 0, legacy_irqs);
 
-		if (num > NR_IRQS_LEGACY) {
-			ret = irq_create_strict_mappings(id, NR_IRQS_LEGACY,
-					NR_IRQS_LEGACY, num - NR_IRQS_LEGACY);
+		if (num > legacy_irqs) {
+			ret = irq_create_strict_mappings(id, legacy_irqs,
+					legacy_irqs, num - legacy_irqs);
 			if (ret)
 				pr_err("Error creating mapping for the "
 						"remaining IRQs: %d\n", ret);