diff options
| author | Jens Axboe <axboe@suse.de> | 2006-06-21 09:36:18 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@nelson.home.kernel.dk> | 2006-06-23 17:10:39 +0200 |
| commit | dd67d051529387f6e44d22d1d5540ef281965fdd (patch) | |
| tree | 80457f9a2ad3e562b179e40f5c8d51b4f24d6d9e /include/linux | |
| parent | 9e94cd4fd1812bab45237f998b3c6fa1b24023fd (diff) | |
[PATCH] rbtree: support functions used by the io schedulers
They all duplicate macros to check for empty root and/or node, and
clearing a node. So put those in rbtree.h.
Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/rbtree.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h index f37006f2166..8d5382e62c0 100644 --- a/include/linux/rbtree.h +++ b/include/linux/rbtree.h @@ -132,6 +132,10 @@ static inline void rb_set_color(struct rb_node *rb, int color) #define RB_ROOT (struct rb_root) { NULL, } #define rb_entry(ptr, type, member) container_of(ptr, type, member) +#define RB_EMPTY_ROOT(root) ((root)->rb_node == NULL) +#define RB_EMPTY_NODE(node) (rb_parent(node) != node) +#define RB_CLEAR_NODE(node) (rb_set_parent(node, node)) + extern void rb_insert_color(struct rb_node *, struct rb_root *); extern void rb_erase(struct rb_node *, struct rb_root *); |