linux-kernel - [tip:x86/urgent] x86/apic: Do not init irq remapping if ioapic is disabled

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Message-ID: <tip-2e63ad4bd5dd583871e6602f9d398b9322d358d9@git.kernel.org>
Date:   Wed, 24 Aug 2016 00:52:22 -0700
From:   tip-bot for Wanpeng Li <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, linux-kernel@...r.kernel.org, joro@...tes.org,
        tglx@...utronix.de, peterz@...radead.org, mingo@...nel.org,
        wanpeng.li@...mail.com
Subject: [tip:x86/urgent] x86/apic: Do not init irq remapping if ioapic is
 disabled

Commit-ID:  2e63ad4bd5dd583871e6602f9d398b9322d358d9
Gitweb:     http://git.kernel.org/tip/2e63ad4bd5dd583871e6602f9d398b9322d358d9
Author:     Wanpeng Li <wanpeng.li@...mail.com>
AuthorDate: Tue, 23 Aug 2016 20:07:19 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 24 Aug 2016 09:45:40 +0200

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@...mail.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Joerg Roedel <joro@...tes.org>
Link: http://lkml.kernel.org/r/1471954039-3942-1-git-send-email-wanpeng.li@hotmail.com
Cc: stable@...r.kernel.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 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 cea4fc1..50c95af 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;