Add a unit test that provides coverage for the bug fixed in the commit
entitled "radix-tree: rewrite radix_tree_locate_item fix" from Hugh
Dickins. I've verified that this test fails before his patch due to
miscalculated 'index' values in __locate() in lib/radix-tree.c, and passes
with his fix.
Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/radix-tree/linux/init.h | 1 +
tools/testing/radix-tree/main.c | 15 ++++++++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/radix-tree/linux/init.h
diff --git a/tools/testing/radix-tree/linux/init.h b/tools/testing/radix-tree/linux/init.h
new file mode 100644
index 0000000..360cabb
--- /dev/null
+++ b/tools/testing/radix-tree/linux/init.h
@@ -0,0 +1 @@
+/* An empty file stub that allows radix-tree.c to compile. */
diff --git a/tools/testing/radix-tree/main.c b/tools/testing/radix-tree/main.c
index 65231e9..b7619ff 100644
--- a/tools/testing/radix-tree/main.c
+++ b/tools/testing/radix-tree/main.c
@@ -232,7 +232,7 @@ void copy_tag_check(void)
item_kill_tree(&tree);
}
-void __locate_check(struct radix_tree_root *tree, unsigned long index,
+static void __locate_check(struct radix_tree_root *tree, unsigned long index,
unsigned order)
{
struct item *item;
@@ -248,12 +248,25 @@ void __locate_check(struct radix_tree_root *tree, unsigned long index,
}
}
+static void __order_0_locate_check(void)
+{
+ RADIX_TREE(tree, GFP_KERNEL);
+ int i;
+
+ for (i = 0; i < 50; i++)
+ __locate_check(&tree, rand() % INT_MAX, 0);
+
+ item_kill_tree(&tree);
+}
+
static void locate_check(void)
{
RADIX_TREE(tree, GFP_KERNEL);
unsigned order;
unsigned long offset, index;
+ __order_0_locate_check();
+
for (order = 0; order < 20; order++) {
for (offset = 0; offset < (1 << (order + 3));
offset += (1UL << order)) {
--
2.5.5
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