From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f181.google.com (mail-pd0-f181.google.com [209.85.192.181]) by kanga.kvack.org (Postfix) with ESMTP id D781B6B003B for ; Thu, 16 Jan 2014 19:08:41 -0500 (EST) Received: by mail-pd0-f181.google.com with SMTP id p10so3241903pdj.26 for ; Thu, 16 Jan 2014 16:08:41 -0800 (PST) Received: from mga09.intel.com (mga09.intel.com. [134.134.136.24]) by mx.google.com with ESMTP id dv5si8444918pbb.253.2014.01.16.16.08.40 for ; Thu, 16 Jan 2014 16:08:40 -0800 (PST) Subject: [PATCH v7 6/6] MCS Lock: add Kconfig entries to allow arch-specific hooks From: Tim Chen In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Date: Thu, 16 Jan 2014 16:08:36 -0800 Message-ID: <1389917316.3138.16.camel@schen9-DESK> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Ingo Molnar , Andrew Morton , Thomas Gleixner , "Paul E.McKenney" , Will Deacon Cc: linux-kernel@vger.kernel.org, linux-mm , linux-arch@vger.kernel.org, Linus Torvalds , Waiman Long , Andrea Arcangeli , Alex Shi , Andi Kleen , Michel Lespinasse , Davidlohr Bueso , Matthew R Wilcox , Dave Hansen , Peter Zijlstra , Rik van Riel , Peter Hurley , Tim Chen , Raghavendra K T , George Spelvin , "H. Peter Anvin" , Arnd Bergmann , Aswin Chandramouleeswaran , Scott J Norton , "Figo.zhang" This patch adds Kconfig entries to allow architectures to hook into the MCS lock/unlock functions in the contended case. From: Will Deacon Signed-off-by: Will Deacon --- arch/Kconfig | 3 +++ include/linux/mcs_spinlock.h | 8 ++++++++ 2 files changed, 11 insertions(+) diff --git a/arch/Kconfig b/arch/Kconfig index 80bbb8c..8a2a056 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -303,6 +303,9 @@ config HAVE_CMPXCHG_LOCAL config HAVE_CMPXCHG_DOUBLE bool +config HAVE_ARCH_MCS_LOCK + bool + config ARCH_WANT_IPC_PARSE_VERSION bool diff --git a/include/linux/mcs_spinlock.h b/include/linux/mcs_spinlock.h index d54bb23..d2c02ad 100644 --- a/include/linux/mcs_spinlock.h +++ b/include/linux/mcs_spinlock.h @@ -12,6 +12,14 @@ #ifndef __LINUX_MCS_SPINLOCK_H #define __LINUX_MCS_SPINLOCK_H +/* + * An architecture may provide its own lock/unlock functions for the + * contended case. + */ +#ifdef CONFIG_HAVE_ARCH_MCS_LOCK +#include +#endif + struct mcs_spinlock { struct mcs_spinlock *next; int locked; /* 1 if lock acquired */ -- 1.7.11.7 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org