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1da177e4 LT |
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> | |
40234401 | 12 | #include <linux/module.h> |
1da177e4 LT |
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 | ||
40234401 DH |
22 | EXPORT_SYMBOL(kmap); |
23 | ||
1da177e4 LT |
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 | ||
40234401 DH |
33 | EXPORT_SYMBOL(kunmap); |
34 | ||
1da177e4 LT |
35 | struct page *kmap_atomic_to_page(void *ptr) |
36 | { | |
37 | return virt_to_page(ptr); | |
38 | } |