This broke lint kernels as they define DIAGNOSTIC and fail in kern/subr_stat.c:
/usr/src/sys/kern/subr_stats.c:3384:9: error: implicit declaration of
function 'RB_COLOR' is invalid in C99
[-Werror,-Wimplicit-function-declaration]
RB_COLOR(rbctd64, rblnk),
Author: dougm
Date: Tue Jun 9 20:19:11 2020
New Revision: 361984
URL: https://svnweb.freebsd.org/changeset/base/361984
Log:
To reduce the size of an rb_node, drop the color field. Set the least
significant bit in the pointer to the node from its parent to indicate
that the node is red. Have
