D25204.diff
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	Index: head/sys/sys/tree.h
	===================================================================
	--- head/sys/sys/tree.h
	+++ head/sys/sys/tree.h
	@@ -333,6 +333,12 @@
	#define RB_TRUE 1
	#define RB_FALSE 0

	+/* For debugging support */
	+#define RB_COLOR(elm, field) (RB_PARENT(elm, field) == NULL ? RB_FALSE : \
	+ RB_LEFT(RB_PARENT(elm, field), field) == elm ? \
	+ RB_RED_LF(RB_PARENT(elm, field), field) : \
	+ RB_RED_RT(RB_PARENT(elm, field), field)
	+
	/*
	* Something to be invoked in a loop at the root of every modified subtree,
	* from the bottom up to the root, to update augmented node data.