introduce hashfree() function to free hash tables, with sizes.

ok guenther

2 files changed, 17 insertions, 2 deletions

diff --git a/sys/kern/kern_subr.c b/sys/kern/kern_subr.c
index 1b91e391c8e..2653ec18ac4 100644
--- a/sys/kern/kern_subr.c
+++ b/sys/kern/kern_subr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: kern_subr.c,v 1.47 2016/03/15 04:19:26 stefan Exp $	*/
+/*	$OpenBSD: kern_subr.c,v 1.48 2016/09/24 18:35:52 tedu Exp $	*/
 /*	$NetBSD: kern_subr.c,v 1.15 1996/04/09 17:21:56 ragge Exp $	*/
 
 /*
@@ -176,6 +176,20 @@ hashinit(int elements, int type, int flags, u_long *hashmask)
 	return (hashtbl);
 }
 
+void
+hashfree(void *hash, int elements, int type)
+{
+	u_long hashsize;
+	LIST_HEAD(generic, generic) *hashtbl = hash;
+
+	if (elements <= 0)
+		panic("hashfree: bad cnt");
+	for (hashsize = 1; hashsize < elements; hashsize <<= 1)
+		continue;
+
+	free(hashtbl, type, sizeof(*hashtbl) * hashsize);
+}
+
 /*
  * "startup hook" types, functions, and variables.
  */
diff --git a/sys/sys/systm.h b/sys/sys/systm.h
index b68b6a85521..5ef388b28b3 100644
--- a/sys/sys/systm.h
+++ b/sys/sys/systm.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: systm.h,v 1.118 2016/09/17 14:56:12 jasper Exp $	*/
+/*	$OpenBSD: systm.h,v 1.119 2016/09/24 18:35:52 tedu Exp $	*/
 /*	$NetBSD: systm.h,v 1.50 1996/06/09 04:55:09 briggs Exp $	*/
 
 /*-
@@ -150,6 +150,7 @@ void vfs_op_init(void);
 int	seltrue(dev_t dev, int which, struct proc *);
 int	selfalse(dev_t dev, int which, struct proc *);
 void	*hashinit(int, int, int, u_long *);
+void	 hashfree(void *, int, int);
 int	sys_nosys(struct proc *, void *, register_t *);
 
 void	panic(const char *, ...)