The patch titled
Subject: radix-tree: remove a use of root->height from delete_node
has been added to the -mm tree. Its filename is
radix-tree-remove-a-use-of-root-height-from-delete_node.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/radix-tree-remove-a-use-of-root-height-from-delete_node.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/radix-tree-remove-a-use-of-root-height-from-delete_node.patch
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------------------------------------------------------
From: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Subject: radix-tree: remove a use of root->height from delete_node
If radix_tree_shrink returns whether it managed to shrink, then
__radix_tree_delete_node doesn't ned to query the tree to find out whether
it did any work or not.
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
Cc: Kirill Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/radix-tree.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff -puN lib/radix-tree.c~radix-tree-remove-a-use-of-root-height-from-delete_node lib/radix-tree.c
--- a/lib/radix-tree.c~radix-tree-remove-a-use-of-root-height-from-delete_node
+++ a/lib/radix-tree.c
@@ -1416,8 +1416,10 @@ unsigned long radix_tree_locate_item(str
* radix_tree_shrink - shrink height of a radix tree to minimal
* @root radix tree root
*/
-static inline void radix_tree_shrink(struct radix_tree_root *root)
+static inline bool radix_tree_shrink(struct radix_tree_root *root)
{
+ bool shrunk = false;
+
/* try to shrink tree height */
while (root->height > 0) {
struct radix_tree_node *to_free = root->rnode;
@@ -1477,7 +1479,10 @@ static inline void radix_tree_shrink(str
to_free->slots[0] = RADIX_TREE_RETRY;
radix_tree_node_free(to_free);
+ shrunk = true;
}
+
+ return shrunk;
}
/**
@@ -1500,11 +1505,8 @@ bool __radix_tree_delete_node(struct rad
struct radix_tree_node *parent;
if (node->count) {
- if (node == indirect_to_ptr(root->rnode)) {
- radix_tree_shrink(root);
- if (root->height == 0)
- deleted = true;
- }
+ if (node == indirect_to_ptr(root->rnode))
+ deleted |= radix_tree_shrink(root);
return deleted;
}
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxxxx are
radix-tree-introduce-radix_tree_empty.patch
radix-tree-test-suite-fix-build.patch
radix-tree-test-suite-add-tests-for-radix_tree_locate_item.patch
introduce-config_radix_tree_multiorder.patch
radix-tree-add-missing-sibling-entry-functionality.patch
radix-tree-fix-sibling-entry-insertion.patch
radix-tree-fix-deleting-a-multi-order-entry-through-an-alias.patch
radix-tree-remove-restriction-on-multi-order-entries.patch
radix-tree-introduce-radix_tree_load_root.patch
radix-tree-fix-extending-the-tree-for-multi-order-entries-at-offset-0.patch
radix-tree-test-suite-start-adding-multiorder-tests.patch
radix-tree-fix-several-shrinking-bugs-with-multiorder-entries.patch
radix-tree-rewrite-__radix_tree_lookup.patch
radix-tree-fix-multiorder-bug_on-in-radix_tree_insert.patch
radix-tree-fix-radix_tree_create-for-sibling-entries.patch
radix-tree-rewrite-radix_tree_locate_item.patch
radix-tree-fix-radix_tree_range_tag_if_tagged-for-multiorder-entries.patch
radix-tree-add-copyright-statements.patch
drivers-hwspinlock-use-correct-radix-tree-api.patch
radix-tree-miscellaneous-fixes.patch
radix-tree-split-node-path-into-offset-and-height.patch
radix-tree-replace-node-height-with-node-shift.patch
radix-tree-remove-a-use-of-root-height-from-delete_node.patch
radix-tree-test-suite-remove-dependencies-on-height.patch
radix-tree-remove-root-height.patch
radix-tree-rename-indirect_ptr-to-internal_node.patch
radix-tree-rename-ptr_to_indirect-to-node_to_entry.patch
radix-tree-rename-indirect_to_ptr-to-entry_to_node.patch
radix-tree-rename-radix_tree_is_indirect_ptr.patch
radix-tree-change-naming-conventions-in-radix_tree_shrink.patch
radix-tree-tidy-up-next_chunk.patch
radix-tree-tidy-up-range_tag_if_tagged.patch
radix-tree-tidy-up-__radix_tree_create.patch
radix-tree-introduce-radix_tree_replace_clear_tags.patch
radix-tree-make-radix_tree_descend-more-useful.patch
radix-tree-free-up-the-bottom-bit-of-exceptional-entries-for-reuse.patch
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