RB_SET_PARENT
RB_SET_PARENT(RB_LEFT(victim, __entry), new, __entry);
RB_SET_PARENT(RB_RIGHT(victim, __entry), new, __entry);
#define RB_CLEAR_NODE(node) RB_SET_PARENT(node, node, __entry)
RB_SET_PARENT(_RB_LINK(tmp, dir, field), elm, field); \
RB_SET_PARENT(elm, tmp, field); \
RB_SET_PARENT(elm, gpar, field); \
RB_SET_PARENT(child, in, field); \
RB_SET_PARENT(parent, in, field); \