blob: b0638fd91e92fdacc2f2675207ef723342072597 [file] [log] [blame]
Akinobu Mita6a11f752009-03-31 15:23:17 -07001#ifndef LINUX_PAGE_DEBUG_FLAGS_H
2#define LINUX_PAGE_DEBUG_FLAGS_H
3
4/*
5 * page->debug_flags bits:
6 *
7 * PAGE_DEBUG_FLAG_POISON is set for poisoned pages. This is used to
8 * implement generic debug pagealloc feature. The pages are filled with
9 * poison patterns and set this flag after free_pages(). The poisoned
10 * pages are verified whether the patterns are not corrupted and clear
11 * the flag before alloc_pages().
12 */
13
14enum page_debug_flags {
15 PAGE_DEBUG_FLAG_POISON, /* Page is poisoned */
16};
17
18/*
19 * Ensure that CONFIG_WANT_PAGE_DEBUG_FLAGS reliably
20 * gets turned off when no debug features are enabling it!
21 */
22
23#ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS
24#if !defined(CONFIG_PAGE_POISONING) \
25/* && !defined(CONFIG_PAGE_DEBUG_SOMETHING_ELSE) && ... */
26#error WANT_PAGE_DEBUG_FLAGS is turned on with no debug features!
27#endif
28#endif /* CONFIG_WANT_PAGE_DEBUG_FLAGS */
29
30#endif /* LINUX_PAGE_DEBUG_FLAGS_H */