From: Wanpeng Li <wanpeng.li@xxxxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
commit 2e63ad4bd5dd583871e6602f9d398b9322d358d9 upstream.
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@xxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1471954039-3942-1-git-send-email-wanpeng.li@xxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
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 5c2742b75be1..4abec3858209 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1600,6 +1600,9 @@ void __init enable_IR_x2apic(void)
int ret, x2apic_enabled = 0;
int hardware_init_ret;
+ if (skip_ioapic_setup)
+ return;
+
/* Make sure irq_remap_ops are initialized */
setup_irq_remapping_ops();
--
2.10.0
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