__rb_erase_color
extern void __rb_erase_color(struct rb_node *parent, struct rb_root *root,
__rb_erase_color(rebalance, root, augment->rotate);
EXPORT_SYMBOL(__rb_erase_color);
extern void __rb_erase_color(struct rb_node *parent, struct rb_root *root,
__rb_erase_color(rebalance, root, augment->rotate);