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| author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2014-10-13 15:53:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-14 02:18:21 +0200 |
| commit | a841b65921a959c759da6b5c8d5dc21966b4cf86 (patch) | |
| tree | 0c6219d08ab58143375375a6e3802b1e7ed85701 /include/linux/rbtree_augmented.h | |
| parent | f8da964dfbdca0eb14f9bf67be4ab6d256f90b7f (diff) | |
| download | lwn-a841b65921a959c759da6b5c8d5dc21966b4cf86.tar.gz lwn-a841b65921a959c759da6b5c8d5dc21966b4cf86.zip | |
rbtree: add comment to rb_insert_augmented()
The comment is copied from Documentation/rbtree.txt, but this comment is
so important that it should also be in the code.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Michel Lespinasse <walken@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/rbtree_augmented.h')
| -rw-r--r-- | include/linux/rbtree_augmented.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/rbtree_augmented.h b/include/linux/rbtree_augmented.h index fea49b5da12a..378c5ee75f78 100644 --- a/include/linux/rbtree_augmented.h +++ b/include/linux/rbtree_augmented.h @@ -43,6 +43,16 @@ struct rb_augment_callbacks { extern void __rb_insert_augmented(struct rb_node *node, struct rb_root *root, void (*augment_rotate)(struct rb_node *old, struct rb_node *new)); +/* + * Fixup the rbtree and update the augmented information when rebalancing. + * + * On insertion, the user must update the augmented information on the path + * leading to the inserted node, then call rb_link_node() as usual and + * rb_augment_inserted() instead of the usual rb_insert_color() call. + * If rb_augment_inserted() rebalances the rbtree, it will callback into + * a user provided function to update the augmented information on the + * affected subtrees. + */ static inline void rb_insert_augmented(struct rb_node *node, struct rb_root *root, const struct rb_augment_callbacks *augment) |