From patchwork Fri Jun 6 15:55:40 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Davidlohr Bueso X-Patchwork-Id: 4312491 Return-Path: X-Original-To: patchwork-linux-parisc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 8276ABEEAA for ; Fri, 6 Jun 2014 15:56:42 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D48742025B for ; Fri, 6 Jun 2014 15:56:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0B0CF20136 for ; Fri, 6 Jun 2014 15:56:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752007AbaFFP4Y (ORCPT ); Fri, 6 Jun 2014 11:56:24 -0400 Received: from g4t3426.houston.hp.com ([15.201.208.54]:59406 "EHLO g4t3426.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752310AbaFFP4F (ORCPT ); Fri, 6 Jun 2014 11:56:05 -0400 Received: from g4t3433.houston.hp.com (g4t3433.houston.hp.com [16.210.25.219]) by g4t3426.houston.hp.com (Postfix) with ESMTP id 128DA292; Fri, 6 Jun 2014 15:56:05 +0000 (UTC) Received: from buesod1.americas.hpqcorp.net (unknown [16.212.160.243]) by g4t3433.houston.hp.com (Postfix) with ESMTP id 3AE9562; Fri, 6 Jun 2014 15:56:02 +0000 (UTC) From: Davidlohr Bueso To: peterz@infradead.org, mingo@kernel.org Cc: mpatocka@redhat.com, torvalds@linux-foundation.org, jason.low2@hp.com, waiman.long@hp.com, jejb@parisc-linux.org, paulmck@linux.vnet.ibm.com, dave.anglin@bell.net, aswin@hp.com, davidlohr@hp.com, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org Subject: [PATCH 2/2] locking/rwsem: Disable optimistic spinning for PA-RISC Date: Fri, 6 Jun 2014 08:55:40 -0700 Message-Id: <1402070140-15090-3-git-send-email-davidlohr@hp.com> X-Mailer: git-send-email 1.8.1.4 In-Reply-To: <1402070140-15090-1-git-send-email-davidlohr@hp.com> References: <1402070140-15090-1-git-send-email-davidlohr@hp.com> Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP PA-RISC's cmpxchg is not save against normal stores and the code used for optimistic spinning is known broken because of this. Disable for now. [Changelog from PeterZ] Reported-by: Mikulas Patocka Signed-off-by: Davidlohr Bueso --- kernel/Kconfig.locks | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks index e4c3162..125c77a 100644 --- a/kernel/Kconfig.locks +++ b/kernel/Kconfig.locks @@ -226,7 +226,7 @@ config MUTEX_SPIN_ON_OWNER config RWSEM_SPIN_ON_OWNER def_bool y - depends on SMP && RWSEM_XCHGADD_ALGORITHM + depends on SMP && RWSEM_XCHGADD_ALGORITHM && !PARISC config ARCH_USE_QUEUE_RWLOCK bool