From patchwork Wed Oct 10 00:25:18 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 1572241 Return-Path: X-Original-To: patchwork-linux-parisc@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 9DF993FD9C for ; Wed, 10 Oct 2012 06:12:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754783Ab2JJGMK (ORCPT ); Wed, 10 Oct 2012 02:12:10 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:49750 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752386Ab2JJGMJ (ORCPT ); Wed, 10 Oct 2012 02:12:09 -0400 Received: by mail-pb0-f46.google.com with SMTP id rr4so358018pbb.19 for ; Tue, 09 Oct 2012 23:12:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=subject:to:cc:from:date:message-id:mime-version:content-type :content-transfer-encoding:x-gm-message-state; bh=3knj0Cd7hi61QGBuC0BPQ6e/j6MI1+h5ZBIajKIzH70=; b=cQthx9a9y51HiwCJ6SCAKjhs3qJEMVkodPQuJhVup8Ahlh4zhoM6WfU3es3PWWm4uM WuGUYTIUfiaNVdDwT+7yqwyy342ml7YRbj6rvShW0PEZp5879SCf58xcPcnp1z6Jlbl6 SiH1Isz5jO+OfhBNOVt2ln6shlBpIuEphAVLu+gOheU1zu/QPH9t5Ph+5VeIEWG1mZQz S56oefq4RzCqMtAgvpGtUTMBktvAPulkXwNrP7G9JkB6PNmzzRpeYmVhu5cLsLHMvCVP Hh2fSAph/OBUunZpUZ2mwuXvy0OjM5HBiy68LQBlQXegbXbq/x7CXDGlDC7z5iHo31L5 JwQw== Received: by 10.68.131.40 with SMTP id oj8mr37796352pbb.40.1349849529226; Tue, 09 Oct 2012 23:12:09 -0700 (PDT) Received: from localhost (i118-21-136-4.s30.a048.ap.plala.or.jp. [118.21.136.4]) by mx.google.com with ESMTPS id ih2sm513509pbc.65.2012.10.09.23.12.05 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 09 Oct 2012 23:12:08 -0700 (PDT) Subject: Patch "parisc: Add missing RCU idle APIs on idle loop" has been added to the 3.5-stable tree To: fweisbec@gmail.com, deller@gmx.de, gregkh@linuxfoundation.org, jejb@parisc-linux.org, josh@joshtriplett.org, linux-parisc@vger.kernel.org, paulmck@linux.vnet.ibm.com Cc: , From: Date: Wed, 10 Oct 2012 09:25:18 +0900 Message-ID: <13498287181261@kroah.org> MIME-Version: 1.0 X-Gm-Message-State: ALoCoQmioJH/rzyb8pc+2tcV7DEzLfun/qkPSqtsN3JlDdAs2qxTJnI1ZUXrBVcpBZ4ehuqXnXPr Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org This is a note to let you know that I've just added the patch titled parisc: Add missing RCU idle APIs on idle loop to the 3.5-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: parisc-add-missing-rcu-idle-apis-on-idle-loop.patch and it can be found in the queue-3.5 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. From fbe752188d5589e7fcbb8e79824e560f77dccc92 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Wed, 22 Aug 2012 17:27:34 +0200 Subject: parisc: Add missing RCU idle APIs on idle loop From: Frederic Weisbecker commit fbe752188d5589e7fcbb8e79824e560f77dccc92 upstream. In the old times, the whole idle task was considered as an RCU quiescent state. But as RCU became more and more successful overtime, some RCU read side critical section have been added even in the code of some architectures idle tasks, for tracing for example. So nowadays, rcu_idle_enter() and rcu_idle_exit() must be called by the architecture to tell RCU about the part in the idle loop that doesn't make use of rcu read side critical sections, typically the part that puts the CPU in low power mode. This is necessary for RCU to find the quiescent states in idle in order to complete grace periods. Add this missing pair of calls in the parisc's idle loop. Reported-by: Paul E. McKenney Signed-off-by: Frederic Weisbecker Cc: James E.J. Bottomley Cc: Helge Deller Cc: Parisc Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett Signed-off-by: Greg Kroah-Hartman --- arch/parisc/kernel/process.c | 3 +++ 1 file changed, 3 insertions(+) Patches currently in stable-queue which might be from fweisbec@gmail.com are queue-3.5/frv-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/cris-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/m68k-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/alpha-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/h8300-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/parisc-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/m32r-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/score-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/mn10300-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/xtensa-add-missing-rcu-idle-apis-on-idle-loop.patch -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html --- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -48,6 +48,7 @@ #include #include #include +#include #include #include @@ -69,8 +70,10 @@ void cpu_idle(void) /* endless idle loop with no priority at all */ while (1) { + rcu_idle_enter(); while (!need_resched()) barrier(); + rcu_idle_exit(); schedule_preempt_disabled(); check_pgt_cache(); }