linux-kernel - [PATCH] kernfs: Clarify lockdep name for kn->count

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Date:   Thu, 17 Aug 2017 11:49:56 -0400
From:   Waiman Long <longman@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Waiman Long <longman@...hat.com>
Subject: [PATCH] kernfs: Clarify lockdep name for kn->count

The reference count in kernfs_node structure is treated like a rwsem by
using lockdep instrumentation code. The lockdep name, however, is still
"s_active" which is carried over from the old sysfs code. As s_active
is no longer the variable name, its use may confuse users on where the
lock is when it is reported by lockdep. So it is changed to "kn->count"
which is how this variable is normally referenced in kernfs code.

Signed-off-by: Waiman Long <longman@...hat.com>
---
 fs/kernfs/file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index ac2dfe0..e6c8954 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -997,7 +997,7 @@ struct kernfs_node *__kernfs_create_file(struct kernfs_node *parent,

 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 	if (key) {
-		lockdep_init_map(&kn->dep_map, "s_active", key, 0);
+		lockdep_init_map(&kn->dep_map, "kn->count", key, 0);
 		kn->flags |= KERNFS_LOCKDEP;
 	}
 #endif
-- 
1.8.3.1