radix_tree: add radix_tree_dump

This is debug code which is #if 0 out.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index d907dca302d5..1624c4117961 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -173,6 +173,41 @@ radix_tree_find_next_bit(const unsigned long *addr,
         return size;
 }
 
+#if 0
+static void dump_node(void *slot, int height, int offset)
+{
+        struct radix_tree_node *node;
+        int i;
+
+        if (!slot)
+                return;
+
+        if (height == 0) {
+                pr_debug("radix entry %p offset %d\n", slot, offset);
+                return;
+        }
+
+        node = indirect_to_ptr(slot);
+        pr_debug("radix node: %p offset %d tags %lx %lx %lx path %x count %d parent %p\n",
+                slot, offset, node->tags[0][0], node->tags[1][0],
+                node->tags[2][0], node->path, node->count, node->parent);
+
+        for (i = 0; i < RADIX_TREE_MAP_SIZE; i++)
+                dump_node(node->slots[i], height - 1, i);
+}
+
+/* For debug */
+static void radix_tree_dump(struct radix_tree_root *root)
+{
+        pr_debug("radix root: %p height %d rnode %p tags %x\n",
+                        root, root->height, root->rnode,
+                        root->gfp_mask >> __GFP_BITS_SHIFT);
+        if (!radix_tree_is_indirect_ptr(root->rnode))
+                return;
+        dump_node(root->rnode, root->height, 0);
+}
+#endif
+
 /*
  * This assumes that the caller has performed appropriate preallocation, and
  * that the caller has pinned this thread of control to the current CPU.