dm: remove dummy definition of 'struct dm_table'

Change the map pointer in 'struct mapped_device' from 'struct dm_table
__rcu *' to 'void __rcu *' to avoid the need for the dummy definition.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>

1 files changed, 3 insertions, 11 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index cc9ab343730d..3cae8547420a 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -121,14 +121,6 @@ struct dm_rq_clone_bio_info {
 #define DMF_SUSPENDED_INTERNALLY 7
 
 /*
- * A dummy definition to make RCU happy.
- * struct dm_table should never be dereferenced in this file.
- */
-struct dm_table {
-        int undefined__;
-};
-
-/*
  * Work processed by per-device workqueue.
  */
 struct mapped_device {
@@ -138,11 +130,11 @@ struct mapped_device {
         atomic_t open_count;
 
         /*
-         * The current mapping.
+         * The current mapping (struct dm_table *).
          * Use dm_get_live_table{_fast} or take suspend_lock for
          * dereference.
          */
-        struct dm_table __rcu *map;
+        void __rcu *map;
 
         struct list_head table_devices;
         struct mutex table_devices_lock;
@@ -2562,7 +2554,7 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
         __bind_mempools(md, t);
 
         old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
-        rcu_assign_pointer(md->map, t);
+        rcu_assign_pointer(md->map, (void *)t);
         md->immutable_target_type = dm_table_get_immutable_target_type(t);
 
         dm_table_set_restrictions(t, q, limits);