From 2e63ad4bd5dd583871e6602f9d398b9322d358d9 Mon Sep 17 00:00:00 2001 From: Wanpeng Li Date: Tue, 23 Aug 2016 20:07:19 +0800 Subject: [PATCH] x86/apic: Do not init irq remapping if ioapic is disabled native_smp_prepare_cpus -> default_setup_apic_routing -> enable_IR_x2apic -> irq_remapping_prepare -> intel_prepare_irq_remapping -> intel_setup_irq_remapping So IR table is setup even if "noapic" boot parameter is added. As a result we crash later when the interrupt affinity is set due to a half initialized remapping infrastructure. Prevent remap initialization when IOAPIC is disabled. Signed-off-by: Wanpeng Li Cc: Peter Zijlstra Cc: Joerg Roedel Link: http://lkml.kernel.org/r/1471954039-3942-1-git-send-email-wanpeng.li@hotmail.com Cc: stable@vger.kernel.org Signed-off-by: Thomas Gleixner --- arch/x86/kernel/apic/apic.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index cea4fc19e844..50c95af0f017 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1623,6 +1623,9 @@ void __init enable_IR_x2apic(void) unsigned long flags; int ret, ir_stat; + if (skip_ioapic_setup) + return; + ir_stat = irq_remapping_prepare(); if (ir_stat < 0 && !x2apic_supported()) return; -- 2.20.1