dm snapshot: remove unused definitions

Remove a couple of unused #defines.
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

drivers/md/dm-snap.c

@@ -29,16 +29,6 @@ static const char dm_snapshot_merge_target_name[] = "snapshot-merge";
 #define dm_target_is_snapshot_merge(ti) \
 	((ti)->type->name == dm_snapshot_merge_target_name)
 
-/*
- * The percentage increment we will wake up users at
- */
-#define WAKE_UP_PERCENT 5
-
-/*
- * kcopyd priority of snapshot operations
- */
-#define SNAPSHOT_COPY_PRIORITY 2
-
 /*
  * The size of the mempool used to track chunks in use.
  */