From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760782Ab3K0CBH (ORCPT ); Tue, 26 Nov 2013 21:01:07 -0500 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:43080 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760762Ab3K0CA4 (ORCPT ); Tue, 26 Nov 2013 21:00:56 -0500 Subject: [PATCH v7 2/2] Documentation, x86, apic, kexec: Add disable_cpu_apicid kernel parameter To: hpa@linux.intel.com, ebiederm@xmission.com, vgoyal@redhat.com From: HATAYAMA Daisuke Cc: kexec@lists.infradead.org, linux-kernel@vger.kernel.org, bp@alien8.de, akpm@linux-foundation.org, fengguang.wu@intel.com, jingbai.ma@hp.com Date: Wed, 27 Nov 2013 11:00:53 +0900 Message-ID: <20131127020053.1493.54092.stgit@localhost6.localdomain6> In-Reply-To: <20131127020006.1493.86091.stgit@localhost6.localdomain6> References: <20131127020006.1493.86091.stgit@localhost6.localdomain6> User-Agent: StGit/0.16 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add disable_cpu_apicid kernel parameter to disable the CPU with the specified number of initial APIC ID, mostly used for the kdump 2nd kernel to disable BSP to wake up multiple CPUs without causing system reset or hang due to sending INIT from AP to BSP. Signed-off-by: HATAYAMA Daisuke --- Documentation/kernel-parameters.txt | 9 +++++++++ 1 file changed, 9 insertions(+) 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] + Format: + The number of initial APIC ID for the + corresponding CPU to be disabled at boot, + mostly used for the kdump 2nd kernel to + disable BSP to wake up multiple CPUs without + causing system reset or hang due to sending + INIT from AP to BSP. + disable_ddw [PPC/PSERIES] Disable Dynamic DMA Window support. Use this if to workaround buggy firmware.