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authorByungchul Park <byungchul.park@lge.com>2017-10-25 17:55:58 +0900
committerIngo Molnar <mingo@kernel.org>2017-10-25 12:19:00 +0200
commit6f0397d7e100f3b3978d6ebb6b2dea29ee7c4a95 (patch)
tree3ba81e38c591efdfcff2b4cdd91b1fdbb22701a8 /include/linux/lockdep.h
parent65e53aab6d54385dea799356defcbdcc456fb1a7 (diff)
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@lge.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: amir73il@gmail.com Cc: axboe@kernel.dk Cc: darrick.wong@oracle.com Cc: david@fromorbit.com Cc: hch@infradead.org Cc: idryomov@gmail.com Cc: johan@kernel.org Cc: johannes.berg@intel.com Cc: kernel-team@lge.com Cc: linux-block@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-xfs@vger.kernel.org Cc: oleg@redhat.com Cc: tj@kernel.org Link: http://lkml.kernel.org/r/1508921765-15396-3-git-send-email-byungchul.park@lge.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/lockdep.h')
-rw-r--r--include/linux/lockdep.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index bfa8e0b0d6f1..b6662d05bcda 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)