From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754665Ab3LDGZr (ORCPT ); Wed, 4 Dec 2013 01:25:47 -0500 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:39683 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751400Ab3LDGZq (ORCPT ); Wed, 4 Dec 2013 01:25:46 -0500 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.8.9 X-SHieldMailCheckerPolicyVersion: FJ-ISEC-20120718-2 Message-ID: <529ECAAB.8040309@jp.fujitsu.com> Date: Wed, 04 Dec 2013 15:24:43 +0900 From: HATAYAMA Daisuke User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:24.0) Gecko/20100101 Thunderbird/24.1.1 MIME-Version: 1.0 To: Vivek Goyal CC: "H. Peter Anvin" , "Eric W. Biederman" , Andrew Morton , Fengguang Wu , Borislav Petkov , "kexec@lists.infradead.org" , Linux Kernel Mailing List , Jingbai Ma , Jerry Hoemann Subject: Re: [PATCH v9] x86, apic, kexec, Documentation: Add disable_cpu_apic kernel parameter References: <529D34AA.1000809@jp.fujitsu.com> <20131203152536.GE4251@redhat.com> <529E9CA6.5040200@jp.fujitsu.com> In-Reply-To: <529E9CA6.5040200@jp.fujitsu.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org (2013/12/04 12:08), HATAYAMA Daisuke wrote: > (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. > Indo-san, who introduced acpi_rsdp and KEXEC tag, told me that historical reason why KEXEC tag was introduced. disable_cpu_apicid is generic at least in the current version, so the tag doesn't need to be specified here. I'll post a new version soon. -- Thanks. HATAYAMA, Daisuke