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