1 // SPDX-License-Identifier: GPL-2.0
2 /* xfrm_hash.c: Common hash table code.
3  *
4  * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
5  */
6 
7 #include <linux/kernel.h>
8 #include <linux/mm.h>
9 #include <linux/memblock.h>
10 #include <linux/vmalloc.h>
11 #include <linux/slab.h>
12 #include <linux/xfrm.h>
13 
14 #include "xfrm_hash.h"
15 
xfrm_hash_alloc(unsigned int sz)16 struct hlist_head *xfrm_hash_alloc(unsigned int sz)
17 {
18 	struct hlist_head *n;
19 
20 	if (sz <= PAGE_SIZE)
21 		n = kzalloc(sz, GFP_KERNEL);
22 	else if (hashdist)
23 		n = vzalloc(sz);
24 	else
25 		n = (struct hlist_head *)
26 			__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
27 					 get_order(sz));
28 
29 	return n;
30 }
31 
xfrm_hash_free(struct hlist_head * n,unsigned int sz)32 void xfrm_hash_free(struct hlist_head *n, unsigned int sz)
33 {
34 	if (sz <= PAGE_SIZE)
35 		kfree(n);
36 	else if (hashdist)
37 		vfree(n);
38 	else
39 		free_pages((unsigned long)n, get_order(sz));
40 }
41