Remove obsolete kern.nselcoll sysctl.

OK millert@ deraadt@

lib/libc/sys/sysctl.2

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: sysctl.2,v 1.48 2022/03/31 17:27:16 naddy Exp $
+.\"	$OpenBSD: sysctl.2,v 1.49 2022/08/16 13:29:52 visa Exp $
 .\"
 .\" Copyright (c) 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -27,7 +27,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: March 31 2022 $
+.Dd $Mdocdate: August 16 2022 $
 .Dt SYSCTL 2
 .Os
 .Sh NAME
@@ -460,7 +460,6 @@ information.
 .It Dv KERN_NGROUPS Ta "integer" Ta "no"
 .It Dv KERN_NOSUIDCOREDUMP Ta "integer" Ta "yes"
 .It Dv KERN_NPROCS Ta "integer" Ta "no"
-.It Dv KERN_NSELCOLL Ta "integer" Ta "no"
 .It Dv KERN_NTHREADS Ta "integer" Ta "no"
 .It Dv KERN_NUMVNODES Ta "integer" Ta "no"
 .It Dv KERN_OSRELEASE Ta "string" Ta "no"
@@ -716,10 +715,6 @@ Whether a process may dump core after changing user or group ID:
 .El
 .It Dv KERN_NPROCS Pq Va kern.nprocs
 The number of entries in the kernel process table.
-.It Dv KERN_NSELCOLL Pq Va kern.nselcoll
-Number of
-.Xr select 2
-collisions.
 .It Dv KERN_NTHREADS Pq Va kern.nthreads
 The number of entries in the kernel thread table.
 .It Dv KERN_NUMVNODES Pq Va kern.numvnodes

sys/kern/kern_sysctl.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: kern_sysctl.c,v 1.405 2022/08/14 01:58:27 jsg Exp $	*/
+/*	$OpenBSD: kern_sysctl.c,v 1.406 2022/08/16 13:29:52 visa Exp $	*/
 /*	$NetBSD: kern_sysctl.c,v 1.17 1996/05/20 17:49:05 mrg Exp $	*/
 
 /*-
@@ -297,7 +297,6 @@ const struct sysctl_bounded_args kern_vars[] = {
 	{KERN_NFILES, &numfiles, SYSCTL_INT_READONLY},
 	{KERN_TTYCOUNT, &tty_count, SYSCTL_INT_READONLY},
 	{KERN_ARGMAX, &arg_max, SYSCTL_INT_READONLY},
-	{KERN_NSELCOLL, &int_zero, SYSCTL_INT_READONLY},
 	{KERN_POSIX1, &posix_version, SYSCTL_INT_READONLY},
 	{KERN_NGROUPS, &ngroups_max, SYSCTL_INT_READONLY},
 	{KERN_JOB_CONTROL, &int_one, SYSCTL_INT_READONLY},

sys/sys/sysctl.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: sysctl.h,v 1.228 2022/05/13 15:32:00 claudio Exp $	*/
+/*	$OpenBSD: sysctl.h,v 1.229 2022/08/16 13:29:53 visa Exp $	*/
 /*	$NetBSD: sysctl.h,v 1.16 1996/04/09 20:55:36 cgd Exp $	*/
 
 /*
@@ -144,7 +144,7 @@ struct ctlname {
 #define KERN_CPTIME		40	/* array: cp_time */
 #define KERN_NCHSTATS		41	/* struct: vfs cache statistics */
 #define KERN_FORKSTAT		42	/* struct: fork statistics */
-#define KERN_NSELCOLL		43	/* int: select(2) collisions */
+/* was KERN_NSELCOLL		43	*/
 #define KERN_TTY		44	/* node: tty information */
 #define	KERN_CCPU		45	/* int: ccpu */
 #define	KERN_FSCALE		46	/* int: fscale */
@@ -237,7 +237,7 @@ struct ctlname {
 	{ "cp_time", CTLTYPE_STRUCT }, \
 	{ "nchstats", CTLTYPE_STRUCT }, \
 	{ "forkstat", CTLTYPE_STRUCT }, \
-	{ "nselcoll", CTLTYPE_INT }, \
+	{ "gap", 0 }, \
 	{ "tty", CTLTYPE_NODE }, \
 	{ "ccpu", CTLTYPE_INT }, \
 	{ "fscale", CTLTYPE_INT }, \