linux/arch/frv/mm/highmem.c
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   1/* highmem.c: arch-specific highmem stuff
   2 *
   3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11#include <linux/highmem.h>
  12#include <linux/module.h>
  13
  14void *kmap(struct page *page)
  15{
  16        might_sleep();
  17        if (!PageHighMem(page))
  18                return page_address(page);
  19        return kmap_high(page);
  20}
  21
  22EXPORT_SYMBOL(kmap);
  23
  24void kunmap(struct page *page)
  25{
  26        if (in_interrupt())
  27                BUG();
  28        if (!PageHighMem(page))
  29                return;
  30        kunmap_high(page);
  31}
  32
  33EXPORT_SYMBOL(kunmap);
  34
  35struct page *kmap_atomic_to_page(void *ptr)
  36{
  37        return virt_to_page(ptr);
  38}
  39