diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index d7972dc..df960f7 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -21,6 +21,8 @@
 #include "segment.h"
 #include <trace/events/f2fs.h>
 
+#define on_build_free_nids(nmi) mutex_is_locked(&nm_i->build_lock)
+
 static struct kmem_cache *nat_entry_slab;
 static struct kmem_cache *free_nid_slab;
 
@@ -1421,7 +1423,7 @@
 	spin_lock(&nm_i->free_nid_list_lock);
 
 	/* We should not use stale free nids created by build_free_nids */
-	if (nm_i->fcnt && !sbi->on_build_free_nids) {
+	if (nm_i->fcnt && !on_build_free_nids(nm_i)) {
 		f2fs_bug_on(list_empty(&nm_i->free_nid_list));
 		list_for_each(this, &nm_i->free_nid_list) {
 			i = list_entry(this, struct free_nid, list);
@@ -1440,9 +1442,7 @@
 
 	/* Let's scan nat pages and its caches to get free nids */
 	mutex_lock(&nm_i->build_lock);
-	sbi->on_build_free_nids = true;
 	build_free_nids(sbi);
-	sbi->on_build_free_nids = false;
 	mutex_unlock(&nm_i->build_lock);
 	goto retry;
 }