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diff --git a/sys/sys/_param.h b/sys/sys/_param.h
new file mode 100644
--- /dev/null
+++ b/sys/sys/_param.h
@@ -0,0 +1,19 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1982, 1986, 1989, 1993
+ * The Regents of the University of California. All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ */
+
+#ifndef _SYS__PARAM_H_
+#define _SYS__PARAM_H_
+
+#define NBBY 8 /* number of bits in a byte */
+#define NBPW sizeof(int) /* number of bytes per word (integer) */
+
+#ifndef howmany
+#define howmany(x, y) (((x)+((y)-1))/(y))
+#endif
+
+#endif /* _SYS__PARAM_H_ */
diff --git a/sys/sys/param.h b/sys/sys/param.h
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -38,6 +38,7 @@
#define _SYS_PARAM_H_
#include <sys/_null.h>
+#include <sys/_param.h>
#define BSD 199506 /* System version (year & month). */
#define BSD4_3 1
@@ -253,9 +254,6 @@
#define NZERO 0 /* default "nice" */
-#define NBBY 8 /* number of bits in a byte */
-#define NBPW sizeof(int) /* number of bytes per word (integer) */
-
#define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */
#define NODEV (dev_t)(-1) /* non-existent device */
@@ -319,10 +317,11 @@
#define isclr(a,i) \
((((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
-/* Macros for counting and rounding. */
-#ifndef howmany
-#define howmany(x, y) (((x)+((y)-1))/(y))
-#endif
+/*
+ * Macros for counting and rounding.
+ *
+ * howmany() has been moved to <sys/_param.h>.
+ */
#define nitems(x) (sizeof((x)) / sizeof((x)[0]))
#define rounddown(x, y) (((x)/(y))*(y))
#define rounddown2(x, y) __align_down(x, y) /* if y is power of two */

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