FreeBSD: fix static module build broken in 7bb707ffa

param_set_arc_free_target(SYSCTL_HANDLER_ARGS) and
param_set_arc_no_grow_shift(SYSCTL_HANDLER_ARGS) defined in
sysctl_os.c must be made available to arc_os.c.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Martin Matuska <mm@FreeBSD.org>
Closes #13915

module/os/freebsd/zfs/arc_os.c

@@ -27,6 +27,7 @@
 #include <sys/zio_checksum.h>
 #include <sys/zfs_context.h>
 #include <sys/arc.h>
+#include <sys/arc_os.h>
 #include <sys/zfs_refcount.h>
 #include <sys/vdev.h>
 #include <sys/vdev_trim.h>
@@ -72,11 +73,9 @@ SYSINIT(arc_free_target_init, SI_SUB_KTHREAD_PAGE, SI_ORDER_ANY,
  * We don't have a tunable for arc_free_target due to the dependency on
  * pagedaemon initialisation.
  */
-int param_set_arc_free_target(SYSCTL_HANDLER_ARGS);
 ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, free_target,
     param_set_arc_free_target, 0, CTLFLAG_RW,
 	"Desired number of free pages below which ARC triggers reclaim");
-int param_set_arc_no_grow_shift(SYSCTL_HANDLER_ARGS);
 ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, no_grow_shift,
     param_set_arc_no_grow_shift, 0, ZMOD_RW,
 	"log2(fraction of ARC which must be free to allow growing)");

module/os/freebsd/zfs/sysctl_os.c

@@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/spa_impl.h>
 #include <sys/vdev.h>
 #include <sys/vdev_impl.h>
+#include <sys/arc_os.h>
 #include <sys/dmu.h>
 #include <sys/dsl_dir.h>
 #include <sys/dsl_dataset.h>
@@ -228,7 +229,7 @@ SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_min,
 
 extern uint_t zfs_arc_free_target;
 
-static int
+int
 param_set_arc_free_target(SYSCTL_HANDLER_ARGS)
 {
 	uint_t val;
@@ -261,7 +262,7 @@ SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_free_target,
 	" (LEGACY)");
 /* END CSTYLED */
 
-static int
+int
 param_set_arc_no_grow_shift(SYSCTL_HANDLER_ARGS)
 {
 	int err, val;