iommu/irq_remapping: Change variable disable_irq_remap to be static

Change variable disable_irq_remap to be static and simplify the code.
Signed-off-by: NJiang Liu <jiang.liu@linux.intel.com>
Tested-by: NJoerg Roedel <joro@8bytes.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: iommu@lists.linux-foundation.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/1420615903-28253-16-git-send-email-jiang.liu@linux.intel.comSigned-off-by: NThomas Gleixner <tglx@linutronix.de>

drivers/iommu/amd_iommu_init.c

@@ -2014,9 +2014,6 @@ static bool detect_ivrs(void)
 	/* Make sure ACS will be enabled during PCI probe */
 	pci_request_acs();
 
-	if (!disable_irq_remap)
-		amd_iommu_irq_remap = true;
-
 	return true;
 }
 
@@ -2123,8 +2120,7 @@ static int __init iommu_go_to_state(enum iommu_init_state state)
 #ifdef CONFIG_IRQ_REMAP
 int __init amd_iommu_prepare(void)
 {
-	if (!amd_iommu_irq_remap)
-		return -1;
+	amd_iommu_irq_remap = true;
 
 	return iommu_go_to_state(IOMMU_ACPI_FINISHED);
 }

drivers/iommu/intel_irq_remapping.c

@@ -588,10 +588,6 @@ static int __init intel_prepare_irq_remapping(void)
 	struct dmar_drhd_unit *drhd;
 	struct intel_iommu *iommu;
 
-	/* First check whether IRQ remapping should be enabled */
-	if (disable_irq_remap)
-		return -ENODEV;
-
 	if (irq_remap_broken) {
 		printk(KERN_WARNING
 			"This system BIOS has enabled interrupt remapping\n"
@@ -600,7 +596,6 @@ static int __init intel_prepare_irq_remapping(void)
 			"interrupt remapping is being disabled.  Please\n"
 			"contact your BIOS vendor for an update\n");
 		add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
-		disable_irq_remap = 1;
 		return -ENODEV;
 	}
 

drivers/iommu/irq_remapping.c

@@ -17,12 +17,11 @@
 #include "irq_remapping.h"
 
 int irq_remapping_enabled;
-
-int disable_irq_remap;
 int irq_remap_broken;
 int disable_sourceid_checking;
 int no_x2apic_optout;
 
+static int disable_irq_remap;
 static struct irq_remap_ops *remap_ops;
 
 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec);

drivers/iommu/irq_remapping.h

@@ -31,7 +31,6 @@ struct cpumask;
 struct pci_dev;
 struct msi_msg;
 
-extern int disable_irq_remap;
 extern int irq_remap_broken;
 extern int disable_sourceid_checking;
 extern int no_x2apic_optout;
@@ -86,7 +85,6 @@ extern struct irq_remap_ops amd_iommu_irq_ops;
 #else  /* CONFIG_IRQ_REMAP */
 
 #define irq_remapping_enabled 0
-#define disable_irq_remap     1
 #define irq_remap_broken      0
 
 #endif /* CONFIG_IRQ_REMAP */