Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752764AbaFFP4Z (ORCPT ); Fri, 6 Jun 2014 11:56:25 -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 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-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 -- 1.8.1.4 -- 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/