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Date: Tue, 21 Sep 2010 01:09:26 +0200
From: Tejun Heo <tj@kernel.org>
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Subject: Re: kvm kdump regression
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To: caiqian@redhat.com
Cc: graff yang <graff.yang@gmail.com>, Marcelo Tosatti <mtosatti@redhat.com>, kexec <kexec@lists.infradead.org>, linux-kernel <linux-kernel@vger.kernel.org>, dhowells@redhat.com, sonic adi <sonic.adi@gmail.com>, Chris Lalancette <clalance@redhat.com>, Avi Kivity <avi@redhat.com>

Hello,

Thanks a lot for testing.  Can you please verify whether the following
patch fixes the problem?

diff --git a/mm/percpu.c b/mm/percpu.c
index 58c572b..c76ef38 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1401,9 +1401,9 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,

 			if (pcpu_first_unit_cpu == NR_CPUS)
 				pcpu_first_unit_cpu = cpu;
+			pcpu_last_unit_cpu = cpu;
 		}
 	}
-	pcpu_last_unit_cpu = cpu;
 	pcpu_nr_units = unit;

 	for_each_possible_cpu(cpu)

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