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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 <wanpeng.li@hotmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Joerg Roedel <joro@8bytes.org>
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 <tglx@linutronix.de>
This commit is contained in:
Wanpeng Li 2016-08-23 20:07:19 +08:00 committed by Thomas Gleixner
parent fa8410b355
commit 2e63ad4bd5
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kernel/apic/apic.c
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@ -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;