+ radix-tree-improve-dump-output.patch added to -mm tree

+ radix-tree-improve-dump-output.patch added to -mm tree

[akpm]

The patch titled
     Subject: radix-tree: improve dump output
has been added to the -mm tree.  Its filename is
     radix-tree-improve-dump-output.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/radix-tree-improve-dump-output.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/radix-tree-improve-dump-output.patch

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*** Remember to use Documentation/SubmitChecklist when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Matthew Wilcox <willy@infradead.org>
Subject: radix-tree: improve dump output

Print the indices of the entries as unsigned (instead of signed) integers
and print the parent node of each entry to help navigate around larger
trees where the layout is not quite so obvious.  Print the indices covered
by a node.  Rearrange the order of fields printed so the indices and
parents line up for each type of entry.

Link: http://lkml.kernel.org/r/1480369871-5271-53-git-send-email-mawilcox@linuxonhyperv.com
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/radix-tree.c |   49 +++++++++++++++++++++++----------------------
 1 file changed, 26 insertions(+), 23 deletions(-)

diff -puN lib/radix-tree.c~radix-tree-improve-dump-output lib/radix-tree.c
--- a/lib/radix-tree.c~radix-tree-improve-dump-output
+++ a/lib/radix-tree.c
@@ -213,15 +213,29 @@ radix_tree_find_next_bit(struct radix_tr
 	return RADIX_TREE_MAP_SIZE;
 }
 
+/*
+ * The maximum index which can be stored in a radix tree
+ */
+static inline unsigned long shift_maxindex(unsigned int shift)
+{
+	return (RADIX_TREE_MAP_SIZE << shift) - 1;
+}
+
+static inline unsigned long node_maxindex(struct radix_tree_node *node)
+{
+	return shift_maxindex(node->shift);
+}
+
 #ifndef __KERNEL__
 static void dump_node(struct radix_tree_node *node, unsigned long index)
 {
 	unsigned long i;
 
-	pr_debug("radix node: %p offset %d tags %lx %lx %lx shift %d count %d exceptional %d parent %p\n",
-		node, node->offset,
+	pr_debug("radix node: %p offset %d indices %lu-%lu parent %p tags %lx %lx %lx shift %d count %d exceptional %d\n",
+		node, node->offset, index, index | node_maxindex(node),
+		node->parent,
 		node->tags[0][0], node->tags[1][0], node->tags[2][0],
-		node->shift, node->count, node->exceptional, node->parent);
+		node->shift, node->count, node->exceptional);
 
 	for (i = 0; i < RADIX_TREE_MAP_SIZE; i++) {
 		unsigned long first = index | (i << node->shift);
@@ -229,14 +243,16 @@ static void dump_node(struct radix_tree_
 		void *entry = node->slots[i];
 		if (!entry)
 			continue;
-		if (is_sibling_entry(node, entry)) {
-			pr_debug("radix sblng %p offset %ld val %p indices %ld-%ld\n",
-					entry, i,
-					*(void **)entry_to_node(entry),
-					first, last);
+		if (entry == RADIX_TREE_RETRY) {
+			pr_debug("radix retry offset %ld indices %lu-%lu parent %p\n",
+					i, first, last, node);
 		} else if (!radix_tree_is_internal_node(entry)) {
-			pr_debug("radix entry %p offset %ld indices %ld-%ld\n",
-					entry, i, first, last);
+			pr_debug("radix entry %p offset %ld indices %lu-%lu parent %p\n",
+					entry, i, first, last, node);
+		} else if (is_sibling_entry(node, entry)) {
+			pr_debug("radix sblng %p offset %ld indices %lu-%lu parent %p val %p\n",
+					entry, i, first, last, node,
+					*(void **)entry_to_node(entry));
 		} else {
 			dump_node(entry_to_node(entry), first);
 		}
@@ -454,19 +470,6 @@ int radix_tree_maybe_preload_order(gfp_t
 	return __radix_tree_preload(gfp_mask, nr_nodes);
 }
 
-/*
- * The maximum index which can be stored in a radix tree
- */
-static inline unsigned long shift_maxindex(unsigned int shift)
-{
-	return (RADIX_TREE_MAP_SIZE << shift) - 1;
-}
-
-static inline unsigned long node_maxindex(struct radix_tree_node *node)
-{
-	return shift_maxindex(node->shift);
-}