From: Wanpeng Li <[email protected]>
3.12-stable review patch. If anyone has any objections, please let me 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 <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Joerg Roedel <[email protected]>
Link:
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
---
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
