Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756678Ab3HLNx3 (ORCPT ); Mon, 12 Aug 2013 09:53:29 -0400 Received: from merlin.infradead.org ([205.233.59.134]:56193 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755340Ab3HLNx0 (ORCPT ); Mon, 12 Aug 2013 09:53:26 -0400 Date: Mon, 12 Aug 2013 15:53:10 +0200 From: Peter Zijlstra To: Lai Jiangshan Cc: Steven Rostedt , paulmck@linux.vnet.ibm.com, linux-kernel@vger.kernel.org, Dipankar Sarma Subject: Re: [PATCH 5/8] rcu: eliminate deadlock for rcu read site Message-ID: <20130812135309.GF27162@twins.programming.kicks-ass.net> References: <1375871104-10688-1-git-send-email-laijs@cn.fujitsu.com> <1375871104-10688-6-git-send-email-laijs@cn.fujitsu.com> <20130808204020.GA31127@linux.vnet.ibm.com> <5205B6FF.7060502@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5205B6FF.7060502@cn.fujitsu.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 604 Lines: 14 On Sat, Aug 10, 2013 at 11:43:59AM +0800, Lai Jiangshan wrote: > Hi, Steven > > I was considering rtmutex's lock->wait_lock is a scheduler lock, > But it is not, and it is just a spinlock of process context. > I hope you change it to a spinlock of irq context. rwmutex::wait_lock is irq-safe; it had better be because its taken under task_struct::pi_lock. -- 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/