[net-next-2.6.git] / include / linux / page-debug-flags.h

#ifndef LINUX_PAGE_DEBUG_FLAGS_H
#define  LINUX_PAGE_DEBUG_FLAGS_H

/*
 * page->debug_flags bits:
 *
 * PAGE_DEBUG_FLAG_POISON is set for poisoned pages. This is used to
 * implement generic debug pagealloc feature. The pages are filled with
 * poison patterns and set this flag after free_pages(). The poisoned
 * pages are verified whether the patterns are not corrupted and clear
 * the flag before alloc_pages().
 */

enum page_debug_flags {
	PAGE_DEBUG_FLAG_POISON,		/* Page is poisoned */
};

/*
 * Ensure that CONFIG_WANT_PAGE_DEBUG_FLAGS reliably
 * gets turned off when no debug features are enabling it!
 */

#ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS
#if !defined(CONFIG_PAGE_POISONING) \
/* && !defined(CONFIG_PAGE_DEBUG_SOMETHING_ELSE) && ... */
#error WANT_PAGE_DEBUG_FLAGS is turned on with no debug features!
#endif
#endif /* CONFIG_WANT_PAGE_DEBUG_FLAGS */

#endif /* LINUX_PAGE_DEBUG_FLAGS_H */
Commit	Line	Data
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 */
	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 */