From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Yang, Sheng" <sheng.yang@intel.com>
Subject: [PATCH] Fix serial interrupt's destination
Date: Fri, 10 Sep 2010 09:08:13 +0800
Message-ID: <201009100908.13592.sheng.yang@intel.com>
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Lowest Priority can't use with invalid cpu_mask, and the default value of 
CPU_MASK_ALL may cover CPU which wasn't online.


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diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c
--- a/xen/arch/x86/smpboot.c
+++ b/xen/arch/x86/smpboot.c
@@ -1015,7 +1015,7 @@
         irq_vector[irq] = FIRST_HIPRIORITY_VECTOR + seridx + 1;
         per_cpu(vector_irq, cpu)[FIRST_HIPRIORITY_VECTOR + seridx + 1] = irq;
         irq_cfg[irq].vector = FIRST_HIPRIORITY_VECTOR + seridx + 1;
-        irq_cfg[irq].cpu_mask = (cpumask_t)CPU_MASK_ALL;
+        irq_cfg[irq].cpu_mask = cpu_online_map;
     }
 
     /* IPI for cleanuping vectors after irq move */

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