linux-kernel - [RFC][PATCH 08/10] x86: Don't ack_APIC_irq() if lapic is disabled in GENERIC_INTERRUPT

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Date:	Wed, 16 Sep 2009 16:42:29 +0800
From:	Sheng Yang <sheng@...ux.intel.com>
To:	Keir Fraser <keir.fraser@...citrix.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc:	Jun Nakajima <jun.nakajima@...el.com>,
	Eddie Dong <eddie.dong@...el.com>,
	linux-kernel@...r.kernel.org,
	xen-devel <xen-devel@...ts.xensource.com>,
	Sheng Yang <sheng@...ux.intel.com>
Subject: [RFC][PATCH 08/10] x86: Don't ack_APIC_irq() if lapic is disabled in GENERIC_INTERRUPT_VECTOR handler

Xen hybrid guest don't use lapic, but smp_generic_interrupt() assume all it's
caller using lapic.

Signed-off-by: Sheng Yang <sheng@...ux.intel.com>
---
 arch/x86/kernel/irq.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index c3fe010..a887d25 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -236,7 +236,8 @@ void smp_generic_interrupt(struct pt_regs *regs)
 {
 	struct pt_regs *old_regs = set_irq_regs(regs);
 
-	ack_APIC_irq();
+	if (!disable_apic)
+		ack_APIC_irq();
 
 	exit_idle();
 
-- 
1.5.4.5

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