1 files changed, 6 insertions, 7 deletions

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 6b9670d6bbf9..2a087e0f9863 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -28,7 +28,6 @@
 #include <linux/slab.h>
 #include <linux/notifier.h>
 #include <linux/cpu.h>
-#include <linux/gfp.h>
 #include <linux/string.h>
 #include <linux/bitops.h>
 #include <linux/rcupdate.h>
@@ -556,6 +555,10 @@ EXPORT_SYMBOL(radix_tree_tag_clear);
  *
  *  0: tag not present or not set
  *  1: tag set
+ *
+ * Note that the return value of this function may not be relied on, even if
+ * the RCU lock is held, unless tag modification and node deletion are excluded
+ * from concurrency.
  */
 int radix_tree_tag_get(struct radix_tree_root *root,
                         unsigned long index, unsigned int tag)
@@ -596,12 +599,8 @@ int radix_tree_tag_get(struct radix_tree_root *root,
                  */
                 if (!tag_get(node, tag, offset))
                         saw_unset_tag = 1;
-                if (height == 1) {
-                        int ret = tag_get(node, tag, offset);
-
-                        BUG_ON(ret && saw_unset_tag);
-                        return !!ret;
-                }
+                if (height == 1)
+                        return !!tag_get(node, tag, offset);
                 node = rcu_dereference_raw(node->slots[offset]);
                 shift -= RADIX_TREE_MAP_SHIFT;
                 height--;