From: Fenghua Yu Date: Sat, 21 Feb 2015 21:07:27 +0000 (-0800) Subject: iommu/vt-d: Print x2apic opt out info instead of printing a warning X-Git-Tag: firefly_0821_release~176^2~1849^2~3 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=68c1b89cf5653acd1107253e146b332420a1f4a7;p=firefly-linux-kernel-4.4.55.git iommu/vt-d: Print x2apic opt out info instead of printing a warning BIOS can set up x2apic_opt_out bit on some platforms, for various misguided reasons like insane SMM code with weird assumptions about what descriptors look like, or wanting Windows not to enable the IOMMU so that the graphics driver will take it over for SVM in "driver mode". A user can either disable the x2apic_opt_out bit in BIOS or by kernel parameter "no_x2apic_optout". Instead of printing a warning, we just print information of x2apic opt out. Signed-off-by: Fenghua Yu Signed-off-by: David Woodhouse --- diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c index a55b207b9425..07d1a6848ad7 100644 --- a/drivers/iommu/intel_irq_remapping.c +++ b/drivers/iommu/intel_irq_remapping.c @@ -615,10 +615,7 @@ static int __init intel_enable_irq_remapping(void) eim = !dmar_x2apic_optout(); if (!eim) - printk(KERN_WARNING - "Your BIOS is broken and requested that x2apic be disabled.\n" - "This will slightly decrease performance.\n" - "Use 'intremap=no_x2apic_optout' to override BIOS request.\n"); + pr_info("x2apic is disabled because BIOS sets x2apic opt out bit. You can use 'intremap=no_x2apic_optout' to override the BIOS setting.\n"); } for_each_iommu(iommu, drhd) {