From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932454AbdJYI64 (ORCPT ); Wed, 25 Oct 2017 04:58:56 -0400 Received: from LGEAMRELO11.lge.com ([156.147.23.51]:41881 "EHLO lgeamrelo11.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932437AbdJYI4c (ORCPT ); Wed, 25 Oct 2017 04:56:32 -0400 X-Original-SENDERIP: 156.147.1.127 X-Original-MAILFROM: byungchul.park@lge.com X-Original-SENDERIP: 10.177.222.33 X-Original-MAILFROM: byungchul.park@lge.com From: Byungchul Park To: peterz@infradead.org, mingo@kernel.org, axboe@kernel.dk Cc: johan@kernel.org, tglx@linutronix.de, linux-kernel@vger.kernel.org, linux-mm@kvack.org, tj@kernel.org, johannes.berg@intel.com, oleg@redhat.com, amir73il@gmail.com, david@fromorbit.com, darrick.wong@oracle.com, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, hch@infradead.org, idryomov@gmail.com, kernel-team@lge.com Subject: [PATCH v5 2/9] locking/lockdep: Provide empty lockdep_map structure for !CONFIG_LOCKDEP Date: Wed, 25 Oct 2017 17:55:58 +0900 Message-Id: <1508921765-15396-3-git-send-email-byungchul.park@lge.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1508921765-15396-1-git-send-email-byungchul.park@lge.com> References: <1508921765-15396-1-git-send-email-byungchul.park@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org By this patch, the lockdep_map structure takes no space if lockdep is disabled, making a debug facility's impact on unreleated kernel less. Thanks to this, we don't need #ifdef to sparate code due to the lockdep_map structure. Signed-off-by: Byungchul Park --- include/linux/lockdep.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index bfa8e0b..b6662d0 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -527,6 +527,11 @@ static inline void lockdep_on(void) */ struct lock_class_key { }; +/* + * The lockdep_map takes no space if lockdep is disabled: + */ +struct lockdep_map { }; + #define lockdep_depth(tsk) (0) #define lockdep_is_held_type(l, r) (1) -- 1.9.1