include/linux/page-debug-flags.h

   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 */