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 } 42