release/src-rt-6.x.4708/linux/linux-2.6.36/arch/frv/mm/highmem.c

   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
  14 void *kmap(struct page *page)
  15 {
  16         might_sleep();
  17         if (!PageHighMem(page))
  18                 return page_address(page);
  19         return kmap_high(page);
  20 }
  21
  22 EXPORT_SYMBOL(kmap);
  23
  24 void kunmap(struct page *page)
  25 {
  26         if (in_interrupt())
  27                 BUG();
  28         if (!PageHighMem(page))
  29                 return;
  30         kunmap_high(page);
  31 }
  32
  33 EXPORT_SYMBOL(kunmap);
  34
  35 struct page *kmap_atomic_to_page(void *ptr)
  36 {
  37         return virt_to_page(ptr);
  38 }