linux-kernel - [tip:locking/core] locking/lockdep: Provide empty lockdep_map structure for !CONFIG

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Date:   Wed, 25 Oct 2017 04:11:02 -0700
From:   tip-bot for Byungchul Park <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, byungchul.park@....com, peterz@...radead.org,
        tglx@...utronix.de, linux-kernel@...r.kernel.org, hpa@...or.com,
        torvalds@...ux-foundation.org
Subject: [tip:locking/core] locking/lockdep: Provide empty lockdep_map
 structure for !CONFIG_LOCKDEP

Commit-ID:  6f0397d7e100f3b3978d6ebb6b2dea29ee7c4a95
Gitweb:     https://git.kernel.org/tip/6f0397d7e100f3b3978d6ebb6b2dea29ee7c4a95
Author:     Byungchul Park <byungchul.park@....com>
AuthorDate: Wed, 25 Oct 2017 17:55:58 +0900
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 25 Oct 2017 12:19:00 +0200

locking/lockdep: Provide empty lockdep_map structure for !CONFIG_LOCKDEP

After this patch the lockdep_map structure takes no space if lockdep is
disabled, reducing the number of #ifdefs in unrelated kernel code.

Signed-off-by: Byungchul Park <byungchul.park@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: amir73il@...il.com
Cc: axboe@...nel.dk
Cc: darrick.wong@...cle.com
Cc: david@...morbit.com
Cc: hch@...radead.org
Cc: idryomov@...il.com
Cc: johan@...nel.org
Cc: johannes.berg@...el.com
Cc: kernel-team@....com
Cc: linux-block@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org
Cc: linux-mm@...ck.org
Cc: linux-xfs@...r.kernel.org
Cc: oleg@...hat.com
Cc: tj@...nel.org
Link: http://lkml.kernel.org/r/1508921765-15396-3-git-send-email-byungchul.park@lge.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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)