diff options
Diffstat (limited to 'include/linux/rbtree.h')
| -rw-r--r-- | include/linux/rbtree.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h index 4ace31b33380..8d1e83b1c87b 100644 --- a/include/linux/rbtree.h +++ b/include/linux/rbtree.h @@ -79,6 +79,36 @@ rb_insert_augmented(struct rb_node *node, struct rb_root *root, __rb_insert_augmented(node, root, augment->rotate); } +#define RB_DECLARE_CALLBACKS(rbstatic, rbname, rbstruct, rbfield, \ + rbtype, rbaugmented, rbcompute) \ +static void rbname ## _propagate(struct rb_node *rb, struct rb_node *stop) \ +{ \ + while (rb != stop) { \ + rbstruct *node = rb_entry(rb, rbstruct, rbfield); \ + rbtype augmented = rbcompute(node); \ + if (node->rbaugmented == augmented) \ + break; \ + node->rbaugmented = augmented; \ + rb = rb_parent(&node->rbfield); \ + } \ +} \ +static void rbname ## _copy(struct rb_node *rb_old, struct rb_node *rb_new) \ +{ \ + rbstruct *old = rb_entry(rb_old, rbstruct, rbfield); \ + rbstruct *new = rb_entry(rb_new, rbstruct, rbfield); \ + new->rbaugmented = old->rbaugmented; \ +} \ +static void rbname ## _rotate(struct rb_node *rb_old, struct rb_node *rb_new) \ +{ \ + rbstruct *old = rb_entry(rb_old, rbstruct, rbfield); \ + rbstruct *new = rb_entry(rb_new, rbstruct, rbfield); \ + new->rbaugmented = old->rbaugmented; \ + old->rbaugmented = rbcompute(old); \ +} \ +rbstatic const struct rb_augment_callbacks rbname = { \ + rbname ## _propagate, rbname ## _copy, rbname ## _rotate \ +}; + /* Find logical next and previous nodes in a tree */ extern struct rb_node *rb_next(const struct rb_node *); |