Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754712Ab2FMTC7 (ORCPT ); Wed, 13 Jun 2012 15:02:59 -0400 Received: from www.linutronix.de ([62.245.132.108]:50783 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754420Ab2FMTC6 (ORCPT ); Wed, 13 Jun 2012 15:02:58 -0400 Date: Wed, 13 Jun 2012 21:02:55 +0200 (CEST) From: Thomas Gleixner To: "Paul E. McKenney" cc: LKML , Peter Zijlstra , Ingo Molnar , "Srivatsa S. Bhat" , Rusty Russell , Tejun Heo Subject: Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu hotplug threads In-Reply-To: <20120613185748.GF2427@linux.vnet.ibm.com> Message-ID: References: <20120613102823.373180763@linutronix.de> <20120613105815.206105518@linutronix.de> <20120613185748.GF2427@linux.vnet.ibm.com> User-Agent: Alpine 2.02 (LFD 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 698 Lines: 21 On Wed, 13 Jun 2012, Paul E. McKenney wrote: > On Wed, Jun 13, 2012 at 11:00:54AM -0000, Thomas Gleixner wrote: > > /* Now call notifier in preparation. */ > > cpu_notify(CPU_ONLINE | mod, hcpu); > > + smpboot_unpark_threads(cpu); > > OK, RCU must use the lower-level interfaces, given that one of > then CPU_ONLINE notifiers might invoke synchronize_rcu(). We can start the threads before the notifiers. There is no restriction. Thanks, tglx -- 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/