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 */ 16 PAGE_DEBUG_FLAG_GUARD, 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 25 #if !defined(CONFIG_PAGE_POISONING) && \ 26 !defined(CONFIG_PAGE_GUARD) \ 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 */ 33