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Date: Mon, 20 Sep 2010 20:40:13 -0400 (EDT)
From: CAI Qian <caiqian@redhat.com>
To: Tejun Heo <tj@kernel.org>
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,
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        Chris Lalancette <clalance@redhat.com>, Avi Kivity <avi@redhat.com>
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Subject: Re: kvm kdump regression
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----- "Tejun Heo" <tj@kernel.org> wrote:

> Hello,
> 
> Thanks a lot for testing.  Can you please verify whether the
> following patch fixes the problem?
Yes, it did.
> 
> 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)