[PATCH v14 74/74] radix tree: Remove radix_tree_clear_tags

[Matthew Wilcox]

The page cache was the only user of this interface and it has now
been converted to the XArray.  Transform the test into a test of
xas_init_tags().

Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
---
 include/linux/radix-tree.h           |  2 --
 lib/radix-tree.c                     | 13 -----------
 lib/test_xarray.c                    | 33 ++++++++++++++++++++++++++++
 tools/testing/radix-tree/tag_check.c | 29 ------------------------
 4 files changed, 33 insertions(+), 44 deletions(-)

diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index f8ef267e4975..27c15990951d 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -252,8 +252,6 @@ void radix_tree_iter_delete(struct radix_tree_root *,
 			struct radix_tree_iter *iter, void __rcu **slot);
 void *radix_tree_delete_item(struct radix_tree_root *, unsigned long, void *);
 void *radix_tree_delete(struct radix_tree_root *, unsigned long);
-void radix_tree_clear_tags(struct radix_tree_root *, struct radix_tree_node *,
-			   void __rcu **slot);
 unsigned int radix_tree_gang_lookup(const struct radix_tree_root *,
 			void **results, unsigned long first_index,
 			unsigned int max_items);
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index ad03dc0c562f..101f1c28e1b6 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1711,19 +1711,6 @@ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index)
 }
 EXPORT_SYMBOL(radix_tree_delete);
 
-void radix_tree_clear_tags(struct radix_tree_root *root,
-			   struct radix_tree_node *node,
-			   void __rcu **slot)
-{
-	if (node) {
-		unsigned int tag, offset = get_slot_offset(node, slot);
-		for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
-			node_tag_clear(root, node, tag, offset);
-	} else {
-		root_tag_clear_all(root);
-	}
-}
-
 /**
  *	radix_tree_tagged - test whether any items in the tree are tagged
  *	@root:		radix tree root
diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 0ac0c8108ef4..98c0efdd27a0 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -170,12 +170,45 @@ static void check_xa_tag_1(struct xarray *xa, unsigned long index)
 	XA_BUG_ON(xa, !xa_empty(xa));
 }
 
+static void check_xa_tag_2(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	unsigned long index;
+	unsigned int count = 0;
+	void *entry;
+
+	xa_store_value(xa, 0, GFP_KERNEL);
+	xa_set_tag(xa, 0, XA_TAG_0);
+	xas_load(&xas);
+	xas_init_tags(&xas);
+	XA_BUG_ON(xa, !xa_get_tag(xa, 0, XA_TAG_0) == 0);
+
+	for (index = 3500; index < 4500; index++) {
+		xa_store_value(xa, index, GFP_KERNEL);
+		xa_set_tag(xa, index, XA_TAG_0);
+	}
+
+	xas_reset(&xas);
+	xas_for_each_tagged(&xas, entry, ULONG_MAX, XA_TAG_0)
+		count++;
+	XA_BUG_ON(xa, count != 1000);
+
+	xas_for_each(&xas, entry, ULONG_MAX) {
+		xas_init_tags(&xas);
+		XA_BUG_ON(xa, !xa_get_tag(xa, xas.xa_index, XA_TAG_0));
+		XA_BUG_ON(xa, !xas_get_tag(&xas, XA_TAG_0));
+	}
+
+	xa_destroy(xa);
+}
+
 static void check_xa_tag(struct xarray *xa)
 {
 	check_xa_tag_1(xa, 0);
 	check_xa_tag_1(xa, 4);
 	check_xa_tag_1(xa, 64);
 	check_xa_tag_1(xa, 4096);
+	check_xa_tag_2(xa);
 }
 
 static void check_xa_shrink(struct xarray *xa)
diff --git a/tools/testing/radix-tree/tag_check.c b/tools/testing/radix-tree/tag_check.c
index 543181e4847b..56a42f1c5ab0 100644
--- a/tools/testing/radix-tree/tag_check.c
+++ b/tools/testing/radix-tree/tag_check.c
@@ -331,34 +331,6 @@ static void single_check(void)
 	item_kill_tree(&tree);
 }
 
-void radix_tree_clear_tags_test(void)
-{
-	unsigned long index;
-	struct radix_tree_node *node;
-	struct radix_tree_iter iter;
-	void **slot;
-
-	RADIX_TREE(tree, GFP_KERNEL);
-
-	item_insert(&tree, 0);
-	item_tag_set(&tree, 0, 0);
-	__radix_tree_lookup(&tree, 0, &node, &slot);
-	radix_tree_clear_tags(&tree, node, slot);
-	assert(item_tag_get(&tree, 0, 0) == 0);
-
-	for (index = 0; index < 1000; index++) {
-		item_insert(&tree, index);
-		item_tag_set(&tree, index, 0);
-	}
-
-	radix_tree_for_each_slot(slot, &tree, &iter, 0) {
-		radix_tree_clear_tags(&tree, iter.node, slot);
-		assert(item_tag_get(&tree, iter.index, 0) == 0);
-	}
-
-	item_kill_tree(&tree);
-}
-
 void tag_check(void)
 {
 	single_check();
@@ -376,5 +348,4 @@ void tag_check(void)
 	thrash_tags();
 	rcu_barrier();
 	printv(2, "after thrash_tags: %d allocated\n", nr_allocated);
-	radix_tree_clear_tags_test();
 }
-- 
2.17.1