linux-kernel - [PATCH v5 2/9] locking/lockdep: Provide empty lockdep_map structure for !CONFIG

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Message-Id: <1508921765-15396-3-git-send-email-byungchul.park@lge.com>
Date:   Wed, 25 Oct 2017 17:55:58 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     peterz@...radead.org, mingo@...nel.org, axboe@...nel.dk
Cc:     johan@...nel.org, tglx@...utronix.de, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, tj@...nel.org, johannes.berg@...el.com,
        oleg@...hat.com, amir73il@...il.com, david@...morbit.com,
        darrick.wong@...cle.com, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        hch@...radead.org, idryomov@...il.com, kernel-team@....com
Subject: [PATCH v5 2/9] locking/lockdep: Provide empty lockdep_map structure for !CONFIG_LOCKDEP

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 <byungchul.park@....com>
---
 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