fs: dlm: remove additional dereference of lksb

This patch removes a dereference of lksb of lkb when calling ast
tracepoint. First it reduces additional overhead, even if traces
are not active. Second we can deference it in TP_fast_assign from
the existing lkb parameter.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/ast.c

@@ -260,7 +260,7 @@ void dlm_callback_work(struct work_struct *work)
 		} else if (callbacks[i].flags & DLM_CB_CAST) {
 			lkb->lkb_lksb->sb_status = callbacks[i].sb_status;
 			lkb->lkb_lksb->sb_flags = callbacks[i].sb_flags;
-			trace_dlm_ast(ls, lkb, lkb->lkb_lksb);
+			trace_dlm_ast(ls, lkb);
 			castfn(lkb->lkb_astparam);
 		}
 	}

include/trace/events/dlm.h

@@ -138,9 +138,9 @@ TRACE_EVENT(dlm_bast,
 
 TRACE_EVENT(dlm_ast,
 
-	TP_PROTO(struct dlm_ls *ls, struct dlm_lkb *lkb, struct dlm_lksb *lksb),
+	TP_PROTO(struct dlm_ls *ls, struct dlm_lkb *lkb),
 
-	TP_ARGS(ls, lkb, lksb),
+	TP_ARGS(ls, lkb),
 
 	TP_STRUCT__entry(
 		__field(__u32, ls_id)
@@ -152,8 +152,8 @@ TRACE_EVENT(dlm_ast,
 	TP_fast_assign(
 		__entry->ls_id = ls->ls_global_id;
 		__entry->lkb_id = lkb->lkb_id;
-		__entry->sb_flags = lksb->sb_flags;
-		__entry->sb_status = lksb->sb_status;
+		__entry->sb_flags = lkb->lkb_lksb->sb_flags;
+		__entry->sb_status = lkb->lkb_lksb->sb_status;
 	),
 
 	TP_printk("ls_id=%u lkb_id=%x sb_flags=%s sb_status=%d",