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Date: Wed, 04 Dec 2013 12:08:22 +0900
From: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
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To: Vivek Goyal <vgoyal@redhat.com>
CC: "H. Peter Anvin" <hpa@linux.intel.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Fengguang Wu <fengguang.wu@intel.com>, Borislav Petkov <bp@alien8.de>,
        "kexec@lists.infradead.org" <kexec@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Jingbai Ma <jingbai.ma@hp.com>, Jerry Hoemann <jerry.hoemann@hp.com>
Subject: Re: [PATCH v9] x86, apic, kexec, Documentation: Add disable_cpu_apic
 kernel parameter
References: <529D34AA.1000809@jp.fujitsu.com> <20131203152536.GE4251@redhat.com>
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(2013/12/04 0:25), Vivek Goyal wrote:
> On Tue, Dec 03, 2013 at 10:32:26AM +0900, HATAYAMA Daisuke wrote:
>
> [..]
>>
>> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
>> index 50680a5..dd77bec 100644
>> --- a/Documentation/kernel-parameters.txt
>> +++ b/Documentation/kernel-parameters.txt
>> @@ -774,6 +774,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>>   	disable=	[IPV6]
>>   			See Documentation/networking/ipv6.txt.
>>
>> +	disable_cpu_apicid= [X86,APIC,KEXEC,SMP]
>
> Hi Hatayama,
>
> We are almost there. A minor nit. Why have we specified KEXEC here. This
> parameter disabled_cpu_apicid does not seem to dependon CONFIG_KEXEC?
>
> Jerry, this patch looks good to me. Does it work on your system?
>

Because primary user for the option is currently kexec/kdump only.

I referred to acpi_rsdp description:

         acpi_rsdp=      [ACPI,EFI,KEXEC]
                         Pass the RSDP address to the kernel, mostly used
                         on machines running EFI runtime service to boot the
                         second kernel for kdump.

-- 
Thanks.
HATAYAMA, Daisuke