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@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index ac2dfe0c5a9c8520aa8b40c4bab97b710799cc78..e6c8954a4e89acafab9af81f2b26997fa84b1da2 100644 (file)
--- 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