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6a11f75b AM |
1 | #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 | ||
14 | enum page_debug_flags { | |
15 | PAGE_DEBUG_FLAG_POISON, /* Page is poisoned */ | |
c0a32fc5 | 16 | PAGE_DEBUG_FLAG_GUARD, |
6a11f75b AM |
17 | }; |
18 | ||
19 | /* | |
20 | * Ensure that CONFIG_WANT_PAGE_DEBUG_FLAGS reliably | |
21 | * gets turned off when no debug features are enabling it! | |
22 | */ | |
23 | ||
24 | #ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS | |
c0a32fc5 SG |
25 | #if !defined(CONFIG_PAGE_POISONING) && \ |
26 | !defined(CONFIG_PAGE_GUARD) \ | |
6a11f75b AM |
27 | /* && !defined(CONFIG_PAGE_DEBUG_SOMETHING_ELSE) && ... */ |
28 | #error WANT_PAGE_DEBUG_FLAGS is turned on with no debug features! | |
29 | #endif | |
30 | #endif /* CONFIG_WANT_PAGE_DEBUG_FLAGS */ | |
31 | ||
32 | #endif /* LINUX_PAGE_DEBUG_FLAGS_H */ |