[XFRM]: Extract common hashing code into xfrm_hash.[ch]
[linux-2.6.git] / net / xfrm / xfrm_hash.c
1 /* xfrm_hash.c: Common hash table code.
2  *
3  * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
4  */
5
6 #include <linux/kernel.h>
7 #include <linux/mm.h>
8 #include <linux/bootmem.h>
9 #include <linux/vmalloc.h>
10 #include <linux/slab.h>
11 #include <linux/xfrm.h>
12
13 #include "xfrm_hash.h"
14
15 struct hlist_head *xfrm_hash_alloc(unsigned int sz)
16 {
17         struct hlist_head *n;
18
19         if (sz <= PAGE_SIZE)
20                 n = kmalloc(sz, GFP_KERNEL);
21         else if (hashdist)
22                 n = __vmalloc(sz, GFP_KERNEL, PAGE_KERNEL);
23         else
24                 n = (struct hlist_head *)
25                         __get_free_pages(GFP_KERNEL, get_order(sz));
26
27         if (n)
28                 memset(n, 0, sz);
29
30         return n;
31 }
32
33 void xfrm_hash_free(struct hlist_head *n, unsigned int sz)
34 {
35         if (sz <= PAGE_SIZE)
36                 kfree(n);
37         else if (hashdist)
38                 vfree(n);
39         else
40                 free_pages((unsigned long)n, get_order(sz));
41 }