release/src-rt-6.x.4708/linux/linux-2.6.36/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 = kzalloc(sz, GFP_KERNEL);
  21         else if (hashdist)
  22                 n = __vmalloc(sz, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
  23         else
  24                 n = (struct hlist_head *)
  25                         __get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
  26                                          get_order(sz));
  27
  28         return n;
  29 }
  30
  31 void xfrm_hash_free(struct hlist_head *n, unsigned int sz)
  32 {
  33         if (sz <= PAGE_SIZE)
  34                 kfree(n);
  35         else if (hashdist)
  36                 vfree(n);
  37         else
  38                 free_pages((unsigned long)n, get_order(sz));
  39 }