| Akinobu Mita | 6a11f75 | 2009-03-31 15:23:17 -0700 | [diff] [blame] | 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 */ |
| Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 16 | PAGE_DEBUG_FLAG_GUARD, |
| Akinobu Mita | 6a11f75 | 2009-03-31 15:23:17 -0700 | [diff] [blame] | 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 |
| Stanislaw Gruszka | c0a32fc5 | 2012-01-10 15:07:28 -0800 | [diff] [blame] | 25 | #if !defined(CONFIG_PAGE_POISONING) && \ |
| 26 | !defined(CONFIG_PAGE_GUARD) \ |
| Akinobu Mita | 6a11f75 | 2009-03-31 15:23:17 -0700 | [diff] [blame] | 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 */ |