// SPDX-License-Identifier: GPL-2.0

  /* xfrm_hash.c: Common hash table code.
   *
   * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
   */
  
  #include <linux/kernel.h>
  #include <linux/mm.h>
  #include <linux/bootmem.h>
  #include <linux/vmalloc.h>
  #include <linux/slab.h>
  #include <linux/xfrm.h>
  
  #include "xfrm_hash.h"
  
  struct hlist_head *xfrm_hash_alloc(unsigned int sz)
  {
  	struct hlist_head *n;
  
  	if (sz <= PAGE_SIZE)

  		n = kzalloc(sz, GFP_KERNEL);

  	else if (hashdist)

  		n = vzalloc(sz);

  	else
  		n = (struct hlist_head *)

  			__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,

  					 get_order(sz));

  	return n;
  }
  
  void xfrm_hash_free(struct hlist_head *n, unsigned int sz)
  {
  	if (sz <= PAGE_SIZE)
  		kfree(n);
  	else if (hashdist)
  		vfree(n);
  	else
  		free_pages((unsigned long)n, get_order(sz));
  }