Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752208Ab3FWRvK (ORCPT ); Sun, 23 Jun 2013 13:51:10 -0400 Received: from mail-qc0-f171.google.com ([209.85.216.171]:51107 "EHLO mail-qc0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751777Ab3FWRvE (ORCPT ); Sun, 23 Jun 2013 13:51:04 -0400 MIME-Version: 1.0 In-Reply-To: <20130623134516.19094.57189.stgit@srivatsabhat.in.ibm.com> References: <20130623133642.19094.16038.stgit@srivatsabhat.in.ibm.com> <20130623134516.19094.57189.stgit@srivatsabhat.in.ibm.com> From: Matt Turner Date: Sun, 23 Jun 2013 10:50:42 -0700 Message-ID: Subject: Re: [PATCH 31/45] alpha/smp: Use get/put_online_cpus_atomic() to prevent CPU offline To: "Srivatsa S. Bhat" Cc: tglx@linutronix.de, peterz@infradead.org, tj@kernel.org, oleg@redhat.com, paulmck@linux.vnet.ibm.com, rusty@rustcorp.com.au, mingo@kernel.org, akpm@linux-foundation.org, namhyung@kernel.org, walken@google.com, vincent.guittot@linaro.org, laijs@cn.fujitsu.com, rostedt@goodmis.org, wangyun@linux.vnet.ibm.com, xiaoguangrong@linux.vnet.ibm.com, sbw@mit.edu, fweisbec@gmail.com, zhong@linux.vnet.ibm.com, nikunj@linux.vnet.ibm.com, linux-pm@vger.kernel.org, linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Richard Henderson , Ivan Kokshaysky , linux-alpha@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 722 Lines: 17 On Sun, Jun 23, 2013 at 6:45 AM, Srivatsa S. Bhat wrote: > Once stop_machine() is gone from the CPU offline path, we won't be able > to depend on disabling preemption to prevent CPUs from going offline > from under us. > > Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going > offline, while invoking from atomic context. > > Also, remove the non-ASCII character present in this file! It's not non-ASCII. It's a page break. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/