libspl: move kstat implementation from libzpool

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #17861

lib/libspl/Makefile.am

@@ -19,6 +19,7 @@ libspl_la_SOURCES = \
 	%D%/condvar.c \
 	%D%/cred.c \
 	%D%/getexecname.c \
+	%D%/kstat.c \
 	%D%/list.c \
 	%D%/mkdirp.c \
 	%D%/mutex.c \

lib/libspl/kstat.c

@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: CDDL-1.0
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or https://opensource.org/licenses/CDDL-1.0.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
+ * Copyright (c) 2016 Actifio, Inc. All rights reserved.
+ * Copyright (c) 2025, Klara, Inc.
+ */
+
+#include <sys/kstat.h>
+
+/*
+ * =========================================================================
+ * kstats
+ * =========================================================================
+ */
+kstat_t *
+kstat_create(const char *module, int instance, const char *name,
+    const char *class, uchar_t type, ulong_t ndata, uchar_t ks_flag)
+{
+	(void) module, (void) instance, (void) name, (void) class, (void) type,
+	    (void) ndata, (void) ks_flag;
+	return (NULL);
+}
+
+void
+kstat_install(kstat_t *ksp)
+{
+	(void) ksp;
+}
+
+void
+kstat_delete(kstat_t *ksp)
+{
+	(void) ksp;
+}
+
+void
+kstat_set_raw_ops(kstat_t *ksp,
+    int (*headers)(char *buf, size_t size),
+    int (*data)(char *buf, size_t size, void *data),
+    void *(*addr)(kstat_t *ksp, loff_t index))
+{
+	(void) ksp, (void) headers, (void) data, (void) addr;
+}

lib/libzpool/kernel.c

@@ -64,41 +64,6 @@ struct utsname hw_utsname;
 /* If set, all blocks read will be copied to the specified directory. */
 char *vn_dumpdir = NULL;
 
-/*
- * =========================================================================
- * kstats
- * =========================================================================
- */
-kstat_t *
-kstat_create(const char *module, int instance, const char *name,
-    const char *class, uchar_t type, ulong_t ndata, uchar_t ks_flag)
-{
-	(void) module, (void) instance, (void) name, (void) class, (void) type,
-	    (void) ndata, (void) ks_flag;
-	return (NULL);
-}
-
-void
-kstat_install(kstat_t *ksp)
-{
-	(void) ksp;
-}
-
-void
-kstat_delete(kstat_t *ksp)
-{
-	(void) ksp;
-}
-
-void
-kstat_set_raw_ops(kstat_t *ksp,
-    int (*headers)(char *buf, size_t size),
-    int (*data)(char *buf, size_t size, void *data),
-    void *(*addr)(kstat_t *ksp, loff_t index))
-{
-	(void) ksp, (void) headers, (void) data, (void) addr;
-}
-
 uint32_t
 zone_get_hostid(void *zonep)
 {