From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754878Ab2GaO40 (ORCPT ); Tue, 31 Jul 2012 10:56:26 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:33658 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754392Ab2GaO4Y (ORCPT ); Tue, 31 Jul 2012 10:56:24 -0400 X-Authority-Analysis: v=2.0 cv=IOWA+3TG c=1 sm=0 a=s5Htg7xnQOKvHEu9STBOug==:17 a=OpT9cpI26MMA:10 a=I5RZEMmPgckA:10 a=5SG0PmZfjMsA:10 a=Q9fys5e9bTEA:10 a=meVymXHHAAAA:8 a=ayC55rCoAAAA:8 a=-Uf8aLBjeLdyMHd4_ksA:9 a=PUjeQqilurYA:10 a=s5Htg7xnQOKvHEu9STBOug==:117 X-Cloudmark-Score: 0 X-Originating-IP: 72.230.195.127 Message-ID: <1343746583.27983.55.camel@gandalf.stny.rr.com> Subject: Re: __update_max_tr: rcu_read_lock() used illegally while idle! From: Steven Rostedt To: paulmck@linux.vnet.ibm.com Cc: Fengguang Wu , Steven Rostedt , LKML , David Howells Date: Tue, 31 Jul 2012 10:56:23 -0400 In-Reply-To: <1343746311.27983.52.camel@gandalf.stny.rr.com> References: <20120724090330.GA9830@localhost> <1343662752.3847.2.camel@fedora> <20120731120556.GB17252@localhost> <1343741625.27983.39.camel@gandalf.stny.rr.com> <20120731144453.GB2422@linux.vnet.ibm.com> <1343746311.27983.52.camel@gandalf.stny.rr.com> Content-Type: text/plain; charset="ISO-8859-15" X-Mailer: Evolution 3.4.3-1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2012-07-31 at 10:51 -0400, Steven Rostedt wrote: > > OK, I will bite. How about using something like RCU_NONIDLE(), either > > directly or open-coded, to make it a legal call site? > > OK, then something like: > > RCU_NONIDLE(max_data = task_uid(tsk)); > > would work when called normally or with idle? > The comment above RCU_NONIDLE() says: This macro may be used from process-level code only. Although I'm not sure what a 'level' is. Do you mean process-context? If so, then this will not work because it can be called from non process level code (return from interrupt), or any interrupt that enables interrupts. -- Steve