On Tue, Jun 18, 2002 at 09:40:30PM +0900, YAMAMOTO Takashi wrote:
  | From: Luke Mewburn <lukem@netbsd.org>
  | Subject: CVS commit: basesrc/usr.sbin/mlxctl
  | Date: Sun,  2 Jun 2002 02:51:06 +0300 (EEST)
  | > 
  | > Module Name:	basesrc
  | > Committed By:	lukem
  | > Date:		Sat Jun  1 23:51:06 UTC 2002
  | > 
  | > Modified Files:
  | 
  | 
  | > 	syssrc/sys/sys: queue.h
  | > 
  | > Log Message:
  | > SIMPLEQ rototill:
  | 
  | 
  | > - remove the unnecessary elm arg from SIMPLEQ_REMOVE_HEAD().
  | >   this mirrors the functionality of SLIST_REMOVE_HEAD() (the other
  | >   singly-linked list type) and FreeBSD's STAILQ_REMOVE_HEAD()
  | 
  | is it ok to remove the arg while there may be userland programs
  | using it?

I fairly certain that I checked all of the source in NetBSD.