[deliverable/linux.git] / include / linux / page-flags.h

/*
 * Macros for manipulating and testing page->flags
 */

#ifndef PAGE_FLAGS_H
#define PAGE_FLAGS_H

#include <linux/types.h>
#ifndef __GENERATING_BOUNDS_H
#include <linux/mm_types.h>
#include <linux/bounds.h>
#endif /* !__GENERATING_BOUNDS_H */

/*
 * Various page->flags bits:
 *
 * PG_reserved is set for special pages, which can never be swapped out. Some
 * of them might not even exist (eg empty_bad_page)...
 *
 * The PG_private bitflag is set on pagecache pages if they contain filesystem
 * specific data (which is normally at page->private). It can be used by
 * private allocations for its own usage.
 *
 * During initiation of disk I/O, PG_locked is set. This bit is set before I/O
 * and cleared when writeback _starts_ or when read _completes_. PG_writeback
 * is set before writeback starts and cleared when it finishes.
 *
 * PG_locked also pins a page in pagecache, and blocks truncation of the file
 * while it is held.
 *
 * page_waitqueue(page) is a wait queue of all tasks waiting for the page
 * to become unlocked.
 *
 * PG_uptodate tells whether the page's contents is valid.  When a read
 * completes, the page becomes uptodate, unless a disk I/O error happened.
 *
 * PG_referenced, PG_reclaim are used for page reclaim for anonymous and
 * file-backed pagecache (see mm/vmscan.c).
 *
 * PG_error is set to indicate that an I/O error occurred on this page.
 *
 * PG_arch_1 is an architecture specific page state bit.  The generic code
 * guarantees that this bit is cleared for a page when it first is entered into
 * the page cache.
 *
 * PG_highmem pages are not permanently mapped into the kernel virtual address
 * space, they need to be kmapped separately for doing IO on the pages.  The
 * struct page (these bits with information) are always mapped into kernel
 * address space...
 *
 * PG_buddy is set to indicate that the page is free and in the buddy system
 * (see mm/page_alloc.c).
 *
 */

/*
 * Don't use the *_dontuse flags.  Use the macros.  Otherwise you'll break
 * locked- and dirty-page accounting.
 *
 * The page flags field is split into two parts, the main flags area
 * which extends from the low bits upwards, and the fields area which
 * extends from the high bits downwards.
 *
 *  | FIELD | ... | FLAGS |
 *  N-1           ^       0
 *               (NR_PAGEFLAGS)
 *
 * The fields area is reserved for fields mapping zone, node (for NUMA) and
 * SPARSEMEM section (for variants of SPARSEMEM that require section ids like
 * SPARSEMEM_EXTREME with !SPARSEMEM_VMEMMAP).
 */
enum pageflags {
	PG_locked,		/* Page is locked. Don't touch. */
	PG_error,
	PG_referenced,
	PG_uptodate,
	PG_dirty,
	PG_lru,
	PG_active,
	PG_slab,
	PG_owner_priv_1,	/* Owner use. If pagecache, fs may use*/
	PG_checked = PG_owner_priv_1, /* Used by some filesystems */
	PG_pinned = PG_owner_priv_1, /* Xen pinned pagetable */
	PG_arch_1,
	PG_reserved,
	PG_private,		/* If pagecache, has fs-private data */
	PG_writeback,		/* Page is under writeback */
	PG_compound,		/* A compound page */
	PG_swapcache,		/* Swap page: swp_entry_t in private */
	PG_mappedtodisk,	/* Has blocks allocated on-disk */
	PG_reclaim,		/* To be reclaimed asap */
	/* PG_readahead is only used for file reads; PG_reclaim is only for writes */
	PG_readahead = PG_reclaim, /* Reminder to do async read-ahead */
	PG_buddy,		/* Page is free, on buddy lists */

#if (BITS_PER_LONG > 32)
/*
 * 64-bit-only flags build down from bit 31
 *
 * 32 bit  -------------------------------| FIELDS |       FLAGS         |
 * 64 bit  |           FIELDS             | ??????         FLAGS         |
 *         63                            32                              0
 */
	PG_uncached = 31,		/* Page has been mapped as uncached */
#endif
	__NR_PAGEFLAGS
};

#ifndef __GENERATING_BOUNDS_H

/*
 * Macros to create function definitions for page flags
 */
#define TESTPAGEFLAG(uname, lname)					\
static inline int Page##uname(struct page *page) 			\
			{ return test_bit(PG_##lname, &page->flags); }

#define SETPAGEFLAG(uname, lname)					\
static inline void SetPage##uname(struct page *page)			\
			{ set_bit(PG_##lname, &page->flags); }

#define CLEARPAGEFLAG(uname, lname)					\
static inline void ClearPage##uname(struct page *page)			\
			{ clear_bit(PG_##lname, &page->flags); }

#define __SETPAGEFLAG(uname, lname)					\
static inline void __SetPage##uname(struct page *page)			\
			{ __set_bit(PG_##lname, &page->flags); }

#define __CLEARPAGEFLAG(uname, lname)					\
static inline void __ClearPage##uname(struct page *page)		\
			{ __clear_bit(PG_##lname, &page->flags); }

#define TESTSETFLAG(uname, lname)					\
static inline int TestSetPage##uname(struct page *page)			\
		{ return test_and_set_bit(PG_##lname, &page->flags); }

#define TESTCLEARFLAG(uname, lname)					\
static inline int TestClearPage##uname(struct page *page)		\
		{ return test_and_clear_bit(PG_##lname, &page->flags); }


#define PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname)		\
	SETPAGEFLAG(uname, lname) CLEARPAGEFLAG(uname, lname)

#define __PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname)		\
	__SETPAGEFLAG(uname, lname)  __CLEARPAGEFLAG(uname, lname)

#define TESTSCFLAG(uname, lname)					\
	TESTSETFLAG(uname, lname) TESTCLEARFLAG(uname, lname)

/*
 * Manipulation of page state flags
 */
#define PageLocked(page)		\
		test_bit(PG_locked, &(page)->flags)
#define SetPageLocked(page)		\
		set_bit(PG_locked, &(page)->flags)
#define TestSetPageLocked(page)		\
		test_and_set_bit(PG_locked, &(page)->flags)
#define ClearPageLocked(page)		\
		clear_bit(PG_locked, &(page)->flags)
#define TestClearPageLocked(page)	\
		test_and_clear_bit(PG_locked, &(page)->flags)

#define PageError(page)		test_bit(PG_error, &(page)->flags)
#define SetPageError(page)	set_bit(PG_error, &(page)->flags)
#define ClearPageError(page)	clear_bit(PG_error, &(page)->flags)

#define PageReferenced(page)	test_bit(PG_referenced, &(page)->flags)
#define SetPageReferenced(page)	set_bit(PG_referenced, &(page)->flags)
#define ClearPageReferenced(page)	clear_bit(PG_referenced, &(page)->flags)
#define TestClearPageReferenced(page) test_and_clear_bit(PG_referenced, &(page)->flags)

static inline int PageUptodate(struct page *page)
{
	int ret = test_bit(PG_uptodate, &(page)->flags);

	/*
	 * Must ensure that the data we read out of the page is loaded
	 * _after_ we've loaded page->flags to check for PageUptodate.
	 * We can skip the barrier if the page is not uptodate, because
	 * we wouldn't be reading anything from it.
	 *
	 * See SetPageUptodate() for the other side of the story.
	 */
	if (ret)
		smp_rmb();

	return ret;
}

static inline void __SetPageUptodate(struct page *page)
{
	smp_wmb();
	__set_bit(PG_uptodate, &(page)->flags);
#ifdef CONFIG_S390
	page_clear_dirty(page);
#endif
}

static inline void SetPageUptodate(struct page *page)
{
#ifdef CONFIG_S390
	if (!test_and_set_bit(PG_uptodate, &page->flags))
		page_clear_dirty(page);
#else
	/*
	 * Memory barrier must be issued before setting the PG_uptodate bit,
	 * so that all previous stores issued in order to bring the page
	 * uptodate are actually visible before PageUptodate becomes true.
	 *
	 * s390 doesn't need an explicit smp_wmb here because the test and
	 * set bit already provides full barriers.
	 */
	smp_wmb();
	set_bit(PG_uptodate, &(page)->flags);
#endif
}

#define ClearPageUptodate(page)	clear_bit(PG_uptodate, &(page)->flags)

#define PageDirty(page)		test_bit(PG_dirty, &(page)->flags)
#define SetPageDirty(page)	set_bit(PG_dirty, &(page)->flags)
#define TestSetPageDirty(page)	test_and_set_bit(PG_dirty, &(page)->flags)
#define ClearPageDirty(page)	clear_bit(PG_dirty, &(page)->flags)
#define __ClearPageDirty(page)	__clear_bit(PG_dirty, &(page)->flags)
#define TestClearPageDirty(page) test_and_clear_bit(PG_dirty, &(page)->flags)

#define PageLRU(page)		test_bit(PG_lru, &(page)->flags)
#define SetPageLRU(page)	set_bit(PG_lru, &(page)->flags)
#define ClearPageLRU(page)	clear_bit(PG_lru, &(page)->flags)
#define __ClearPageLRU(page)	__clear_bit(PG_lru, &(page)->flags)

#define PageActive(page)	test_bit(PG_active, &(page)->flags)
#define SetPageActive(page)	set_bit(PG_active, &(page)->flags)
#define ClearPageActive(page)	clear_bit(PG_active, &(page)->flags)
#define __ClearPageActive(page)	__clear_bit(PG_active, &(page)->flags)

#define PageSlab(page)		test_bit(PG_slab, &(page)->flags)
#define __SetPageSlab(page)	__set_bit(PG_slab, &(page)->flags)
#define __ClearPageSlab(page)	__clear_bit(PG_slab, &(page)->flags)

#ifdef CONFIG_HIGHMEM
#define PageHighMem(page)	is_highmem(page_zone(page))
#else
#define PageHighMem(page)	0 /* needed to optimize away at compile time */
#endif

#define PageChecked(page)	test_bit(PG_checked, &(page)->flags)
#define SetPageChecked(page)	set_bit(PG_checked, &(page)->flags)
#define ClearPageChecked(page)	clear_bit(PG_checked, &(page)->flags)

#define PagePinned(page)	test_bit(PG_pinned, &(page)->flags)
#define SetPagePinned(page)	set_bit(PG_pinned, &(page)->flags)
#define ClearPagePinned(page)	clear_bit(PG_pinned, &(page)->flags)

#define PageReserved(page)	test_bit(PG_reserved, &(page)->flags)
#define SetPageReserved(page)	set_bit(PG_reserved, &(page)->flags)
#define ClearPageReserved(page)	clear_bit(PG_reserved, &(page)->flags)
#define __ClearPageReserved(page)	__clear_bit(PG_reserved, &(page)->flags)

#define SetPagePrivate(page)	set_bit(PG_private, &(page)->flags)
#define ClearPagePrivate(page)	clear_bit(PG_private, &(page)->flags)
#define PagePrivate(page)	test_bit(PG_private, &(page)->flags)
#define __SetPagePrivate(page)  __set_bit(PG_private, &(page)->flags)
#define __ClearPagePrivate(page) __clear_bit(PG_private, &(page)->flags)

/*
 * Only test-and-set exist for PG_writeback.  The unconditional operators are
 * risky: they bypass page accounting.
 */
#define PageWriteback(page)	test_bit(PG_writeback, &(page)->flags)
#define TestSetPageWriteback(page) test_and_set_bit(PG_writeback,	\
							&(page)->flags)
#define TestClearPageWriteback(page) test_and_clear_bit(PG_writeback,	\
							&(page)->flags)

#define PageBuddy(page)		test_bit(PG_buddy, &(page)->flags)
#define __SetPageBuddy(page)	__set_bit(PG_buddy, &(page)->flags)
#define __ClearPageBuddy(page)	__clear_bit(PG_buddy, &(page)->flags)

#define PageMappedToDisk(page)	test_bit(PG_mappedtodisk, &(page)->flags)
#define SetPageMappedToDisk(page) set_bit(PG_mappedtodisk, &(page)->flags)
#define ClearPageMappedToDisk(page) clear_bit(PG_mappedtodisk, &(page)->flags)

#define PageReadahead(page)	test_bit(PG_readahead, &(page)->flags)
#define SetPageReadahead(page)	set_bit(PG_readahead, &(page)->flags)
#define ClearPageReadahead(page) clear_bit(PG_readahead, &(page)->flags)

#define PageReclaim(page)	test_bit(PG_reclaim, &(page)->flags)
#define SetPageReclaim(page)	set_bit(PG_reclaim, &(page)->flags)
#define ClearPageReclaim(page)	clear_bit(PG_reclaim, &(page)->flags)
#define TestClearPageReclaim(page) test_and_clear_bit(PG_reclaim, &(page)->flags)

#define PageCompound(page)	test_bit(PG_compound, &(page)->flags)
#define __SetPageCompound(page)	__set_bit(PG_compound, &(page)->flags)
#define __ClearPageCompound(page) __clear_bit(PG_compound, &(page)->flags)

/*
 * PG_reclaim is used in combination with PG_compound to mark the
 * head and tail of a compound page
 *
 * PG_compound & PG_reclaim	=> Tail page
 * PG_compound & ~PG_reclaim	=> Head page
 */

#define PG_head_tail_mask ((1L << PG_compound) | (1L << PG_reclaim))

#define PageTail(page)	(((page)->flags & PG_head_tail_mask)	\
				== PG_head_tail_mask)

static inline void __SetPageTail(struct page *page)
{
	page->flags |= PG_head_tail_mask;
}

static inline void __ClearPageTail(struct page *page)
{
	page->flags &= ~PG_head_tail_mask;
}

#define PageHead(page)	(((page)->flags & PG_head_tail_mask)	\
				== (1L << PG_compound))
#define __SetPageHead(page)	__SetPageCompound(page)
#define __ClearPageHead(page)	__ClearPageCompound(page)

#ifdef CONFIG_SWAP
#define PageSwapCache(page)	test_bit(PG_swapcache, &(page)->flags)
#define SetPageSwapCache(page)	set_bit(PG_swapcache, &(page)->flags)
#define ClearPageSwapCache(page) clear_bit(PG_swapcache, &(page)->flags)
#else
#define PageSwapCache(page)	0
#endif

#define PageUncached(page)	test_bit(PG_uncached, &(page)->flags)
#define SetPageUncached(page)	set_bit(PG_uncached, &(page)->flags)
#define ClearPageUncached(page)	clear_bit(PG_uncached, &(page)->flags)

struct page;	/* forward declaration */

extern void cancel_dirty_page(struct page *page, unsigned int account_size);

int test_clear_page_writeback(struct page *page);
int test_set_page_writeback(struct page *page);

static inline void set_page_writeback(struct page *page)
{
	test_set_page_writeback(page);
}

#endif /* !__GENERATING_BOUNDS_H */
#endif	/* PAGE_FLAGS_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Macros for manipulating and testing page->flags
	3	*/
	4
	5	#ifndef PAGE_FLAGS_H
	6	#define PAGE_FLAGS_H
	7
f886ed44	8	#include <linux/types.h>
9223b419	9	#ifndef __GENERATING_BOUNDS_H
6d777953	10	#include <linux/mm_types.h>
9223b419 CL	11	#include <linux/bounds.h>
9223b419 CL	12	#endif /* !__GENERATING_BOUNDS_H */
f886ed44	13
1da177e4 LT	14	/*
	15	* Various page->flags bits:
	16	*
	17	* PG_reserved is set for special pages, which can never be swapped out. Some
	18	* of them might not even exist (eg empty_bad_page)...
	19	*
da6052f7 NP	20	* The PG_private bitflag is set on pagecache pages if they contain filesystem
	21	* specific data (which is normally at page->private). It can be used by
	22	* private allocations for its own usage.
1da177e4	23	*
da6052f7 NP	24	* During initiation of disk I/O, PG_locked is set. This bit is set before I/O
	25	* and cleared when writeback _starts_ or when read _completes_. PG_writeback
	26	* is set before writeback starts and cleared when it finishes.
	27	*
	28	* PG_locked also pins a page in pagecache, and blocks truncation of the file
	29	* while it is held.
	30	*
	31	* page_waitqueue(page) is a wait queue of all tasks waiting for the page
	32	* to become unlocked.
1da177e4 LT	33	*
	34	* PG_uptodate tells whether the page's contents is valid. When a read
	35	* completes, the page becomes uptodate, unless a disk I/O error happened.
	36	*
da6052f7 NP	37	* PG_referenced, PG_reclaim are used for page reclaim for anonymous and
da6052f7 NP	38	* file-backed pagecache (see mm/vmscan.c).
1da177e4 LT	39	*
	40	* PG_error is set to indicate that an I/O error occurred on this page.
	41	*
	42	* PG_arch_1 is an architecture specific page state bit. The generic code
	43	* guarantees that this bit is cleared for a page when it first is entered into
	44	* the page cache.
	45	*
	46	* PG_highmem pages are not permanently mapped into the kernel virtual address
	47	* space, they need to be kmapped separately for doing IO on the pages. The
	48	* struct page (these bits with information) are always mapped into kernel
	49	* address space...
da6052f7 NP	50	*
	51	* PG_buddy is set to indicate that the page is free and in the buddy system
	52	* (see mm/page_alloc.c).
	53	*
1da177e4 LT	54	*/
	55
	56	/*
	57	* Don't use the *_dontuse flags. Use the macros. Otherwise you'll break
91fc8ab3 AW	58	* locked- and dirty-page accounting.
	59	*
	60	* The page flags field is split into two parts, the main flags area
	61	* which extends from the low bits upwards, and the fields area which
	62	* extends from the high bits downwards.
	63	*
	64	* \| FIELD \| ... \| FLAGS \|
9223b419 CL	65	* N-1 ^ 0
9223b419 CL	66	* (NR_PAGEFLAGS)
91fc8ab3	67	*
9223b419 CL	68	* The fields area is reserved for fields mapping zone, node (for NUMA) and
	69	* SPARSEMEM section (for variants of SPARSEMEM that require section ids like
	70	* SPARSEMEM_EXTREME with !SPARSEMEM_VMEMMAP).
1da177e4	71	*/
e2683181 CL	72	enum pageflags {
	73	PG_locked, /* Page is locked. Don't touch. */
	74	PG_error,
	75	PG_referenced,
	76	PG_uptodate,
	77	PG_dirty,
	78	PG_lru,
	79	PG_active,
	80	PG_slab,
	81	PG_owner_priv_1, /* Owner use. If pagecache, fs may use*/
	82	PG_checked = PG_owner_priv_1, /* Used by some filesystems */
	83	PG_pinned = PG_owner_priv_1, /* Xen pinned pagetable */
	84	PG_arch_1,
	85	PG_reserved,
	86	PG_private, /* If pagecache, has fs-private data */
	87	PG_writeback, /* Page is under writeback */
	88	PG_compound, /* A compound page */
	89	PG_swapcache, /* Swap page: swp_entry_t in private */
	90	PG_mappedtodisk, /* Has blocks allocated on-disk */
	91	PG_reclaim, /* To be reclaimed asap */
	92	/* PG_readahead is only used for file reads; PG_reclaim is only for writes */
	93	PG_readahead = PG_reclaim, /* Reminder to do async read-ahead */
	94	PG_buddy, /* Page is free, on buddy lists */
f886ed44 AM	95
	96	#if (BITS_PER_LONG > 32)
	97	/*
	98	* 64-bit-only flags build down from bit 31
	99	*
	100	* 32 bit -------------------------------\| FIELDS \| FLAGS \|
	101	* 64 bit \| FIELDS \| ?????? FLAGS \|
	102	* 63 32 0
	103	*/
e2683181	104	PG_uncached = 31, /* Page has been mapped as uncached */
f886ed44	105	#endif
9223b419	106	__NR_PAGEFLAGS
e2683181	107	};
1da177e4	108
9223b419 CL	109	#ifndef __GENERATING_BOUNDS_H
9223b419 CL	110
f94a62e9 CL	111	/*
	112	* Macros to create function definitions for page flags
	113	*/
	114	#define TESTPAGEFLAG(uname, lname) \
	115	static inline int Page##uname(struct page *page) \
	116	{ return test_bit(PG_##lname, &page->flags); }
	117
	118	#define SETPAGEFLAG(uname, lname) \
	119	static inline void SetPage##uname(struct page *page) \
	120	{ set_bit(PG_##lname, &page->flags); }
	121
	122	#define CLEARPAGEFLAG(uname, lname) \
	123	static inline void ClearPage##uname(struct page *page) \
	124	{ clear_bit(PG_##lname, &page->flags); }
	125
	126	#define __SETPAGEFLAG(uname, lname) \
	127	static inline void __SetPage##uname(struct page *page) \
	128	{ __set_bit(PG_##lname, &page->flags); }
	129
	130	#define __CLEARPAGEFLAG(uname, lname) \
	131	static inline void __ClearPage##uname(struct page *page) \
	132	{ __clear_bit(PG_##lname, &page->flags); }
	133
	134	#define TESTSETFLAG(uname, lname) \
	135	static inline int TestSetPage##uname(struct page *page) \
	136	{ return test_and_set_bit(PG_##lname, &page->flags); }
	137
	138	#define TESTCLEARFLAG(uname, lname) \
	139	static inline int TestClearPage##uname(struct page *page) \
	140	{ return test_and_clear_bit(PG_##lname, &page->flags); }
	141
	142
	143	#define PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname) \
	144	SETPAGEFLAG(uname, lname) CLEARPAGEFLAG(uname, lname)
	145
	146	#define __PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname) \
	147	__SETPAGEFLAG(uname, lname) __CLEARPAGEFLAG(uname, lname)
	148
	149	#define TESTSCFLAG(uname, lname) \
	150	TESTSETFLAG(uname, lname) TESTCLEARFLAG(uname, lname)
	151
1da177e4 LT	152	/*
	153	* Manipulation of page state flags
	154	*/
	155	#define PageLocked(page) \
	156	test_bit(PG_locked, &(page)->flags)
	157	#define SetPageLocked(page) \
	158	set_bit(PG_locked, &(page)->flags)
	159	#define TestSetPageLocked(page) \
	160	test_and_set_bit(PG_locked, &(page)->flags)
	161	#define ClearPageLocked(page) \
	162	clear_bit(PG_locked, &(page)->flags)
	163	#define TestClearPageLocked(page) \
	164	test_and_clear_bit(PG_locked, &(page)->flags)
	165
	166	#define PageError(page) test_bit(PG_error, &(page)->flags)
	167	#define SetPageError(page) set_bit(PG_error, &(page)->flags)
	168	#define ClearPageError(page) clear_bit(PG_error, &(page)->flags)
	169
	170	#define PageReferenced(page) test_bit(PG_referenced, &(page)->flags)
	171	#define SetPageReferenced(page) set_bit(PG_referenced, &(page)->flags)
	172	#define ClearPageReferenced(page) clear_bit(PG_referenced, &(page)->flags)
	173	#define TestClearPageReferenced(page) test_and_clear_bit(PG_referenced, &(page)->flags)
	174
0ed361de NP	175	static inline int PageUptodate(struct page *page)
	176	{
	177	int ret = test_bit(PG_uptodate, &(page)->flags);
	178
	179	/*
	180	* Must ensure that the data we read out of the page is loaded
	181	* _after_ we've loaded page->flags to check for PageUptodate.
	182	* We can skip the barrier if the page is not uptodate, because
	183	* we wouldn't be reading anything from it.
	184	*
	185	* See SetPageUptodate() for the other side of the story.
	186	*/
	187	if (ret)
	188	smp_rmb();
	189
	190	return ret;
	191	}
	192
	193	static inline void __SetPageUptodate(struct page *page)
	194	{
	195	smp_wmb();
	196	__set_bit(PG_uptodate, &(page)->flags);
f6ac2354	197	#ifdef CONFIG_S390
0ed361de NP	198	page_clear_dirty(page);
	199	#endif
	200	}
	201
2dcea57a HC	202	static inline void SetPageUptodate(struct page *page)
2dcea57a HC	203	{
0ed361de	204	#ifdef CONFIG_S390
2dcea57a	205	if (!test_and_set_bit(PG_uptodate, &page->flags))
6c210482	206	page_clear_dirty(page);
f6ac2354	207	#else
0ed361de NP	208	/*
	209	* Memory barrier must be issued before setting the PG_uptodate bit,
	210	* so that all previous stores issued in order to bring the page
	211	* uptodate are actually visible before PageUptodate becomes true.
	212	*
	213	* s390 doesn't need an explicit smp_wmb here because the test and
	214	* set bit already provides full barriers.
	215	*/
	216	smp_wmb();
	217	set_bit(PG_uptodate, &(page)->flags);
1da177e4	218	#endif
0ed361de NP	219	}
0ed361de NP	220
1da177e4 LT	221	#define ClearPageUptodate(page) clear_bit(PG_uptodate, &(page)->flags)
	222
	223	#define PageDirty(page) test_bit(PG_dirty, &(page)->flags)
	224	#define SetPageDirty(page) set_bit(PG_dirty, &(page)->flags)
	225	#define TestSetPageDirty(page) test_and_set_bit(PG_dirty, &(page)->flags)
	226	#define ClearPageDirty(page) clear_bit(PG_dirty, &(page)->flags)
242e5468	227	#define __ClearPageDirty(page) __clear_bit(PG_dirty, &(page)->flags)
1da177e4 LT	228	#define TestClearPageDirty(page) test_and_clear_bit(PG_dirty, &(page)->flags)
1da177e4 LT	229
1da177e4	230	#define PageLRU(page) test_bit(PG_lru, &(page)->flags)
8d438f96 NP	231	#define SetPageLRU(page) set_bit(PG_lru, &(page)->flags)
8d438f96 NP	232	#define ClearPageLRU(page) clear_bit(PG_lru, &(page)->flags)
67453911	233	#define __ClearPageLRU(page) __clear_bit(PG_lru, &(page)->flags)
1da177e4 LT	234
	235	#define PageActive(page) test_bit(PG_active, &(page)->flags)
	236	#define SetPageActive(page) set_bit(PG_active, &(page)->flags)
	237	#define ClearPageActive(page) clear_bit(PG_active, &(page)->flags)
67453911	238	#define __ClearPageActive(page) __clear_bit(PG_active, &(page)->flags)
1da177e4 LT	239
1da177e4 LT	240	#define PageSlab(page) test_bit(PG_slab, &(page)->flags)
f205b2fe NP	241	#define __SetPageSlab(page) __set_bit(PG_slab, &(page)->flags)
f205b2fe NP	242	#define __ClearPageSlab(page) __clear_bit(PG_slab, &(page)->flags)
1da177e4 LT	243
1da177e4 LT	244	#ifdef CONFIG_HIGHMEM
cbe37d09	245	#define PageHighMem(page) is_highmem(page_zone(page))
1da177e4 LT	246	#else
	247	#define PageHighMem(page) 0 /* needed to optimize away at compile time */
	248	#endif
	249
	250	#define PageChecked(page) test_bit(PG_checked, &(page)->flags)
	251	#define SetPageChecked(page) set_bit(PG_checked, &(page)->flags)
	252	#define ClearPageChecked(page) clear_bit(PG_checked, &(page)->flags)
	253
c85b04c3 JF	254	#define PagePinned(page) test_bit(PG_pinned, &(page)->flags)
	255	#define SetPagePinned(page) set_bit(PG_pinned, &(page)->flags)
	256	#define ClearPagePinned(page) clear_bit(PG_pinned, &(page)->flags)
	257
1da177e4 LT	258	#define PageReserved(page) test_bit(PG_reserved, &(page)->flags)
	259	#define SetPageReserved(page) set_bit(PG_reserved, &(page)->flags)
	260	#define ClearPageReserved(page) clear_bit(PG_reserved, &(page)->flags)
	261	#define __ClearPageReserved(page) __clear_bit(PG_reserved, &(page)->flags)
	262
	263	#define SetPagePrivate(page) set_bit(PG_private, &(page)->flags)
	264	#define ClearPagePrivate(page) clear_bit(PG_private, &(page)->flags)
	265	#define PagePrivate(page) test_bit(PG_private, &(page)->flags)
	266	#define __SetPagePrivate(page) __set_bit(PG_private, &(page)->flags)
	267	#define __ClearPagePrivate(page) __clear_bit(PG_private, &(page)->flags)
	268
d688abf5 AM	269	/*
	270	* Only test-and-set exist for PG_writeback. The unconditional operators are
	271	* risky: they bypass page accounting.
	272	*/
1da177e4	273	#define PageWriteback(page) test_bit(PG_writeback, &(page)->flags)
d688abf5 AM	274	#define TestSetPageWriteback(page) test_and_set_bit(PG_writeback, \
	275	&(page)->flags)
	276	#define TestClearPageWriteback(page) test_and_clear_bit(PG_writeback, \
	277	&(page)->flags)
1da177e4	278
676165a8 NP	279	#define PageBuddy(page) test_bit(PG_buddy, &(page)->flags)
	280	#define __SetPageBuddy(page) __set_bit(PG_buddy, &(page)->flags)
	281	#define __ClearPageBuddy(page) __clear_bit(PG_buddy, &(page)->flags)
	282
1da177e4 LT	283	#define PageMappedToDisk(page) test_bit(PG_mappedtodisk, &(page)->flags)
	284	#define SetPageMappedToDisk(page) set_bit(PG_mappedtodisk, &(page)->flags)
	285	#define ClearPageMappedToDisk(page) clear_bit(PG_mappedtodisk, &(page)->flags)
d77c2d7c FW	286
	287	#define PageReadahead(page) test_bit(PG_readahead, &(page)->flags)
	288	#define SetPageReadahead(page) set_bit(PG_readahead, &(page)->flags)
	289	#define ClearPageReadahead(page) clear_bit(PG_readahead, &(page)->flags)
1da177e4 LT	290
	291	#define PageReclaim(page) test_bit(PG_reclaim, &(page)->flags)
	292	#define SetPageReclaim(page) set_bit(PG_reclaim, &(page)->flags)
	293	#define ClearPageReclaim(page) clear_bit(PG_reclaim, &(page)->flags)
	294	#define TestClearPageReclaim(page) test_and_clear_bit(PG_reclaim, &(page)->flags)
	295
1da177e4	296	#define PageCompound(page) test_bit(PG_compound, &(page)->flags)
5e9dace8 NP	297	#define __SetPageCompound(page) __set_bit(PG_compound, &(page)->flags)
5e9dace8 NP	298	#define __ClearPageCompound(page) __clear_bit(PG_compound, &(page)->flags)
1da177e4	299
d85f3385	300	/*
6d777953 CL	301	* PG_reclaim is used in combination with PG_compound to mark the
	302	* head and tail of a compound page
	303	*
	304	* PG_compound & PG_reclaim => Tail page
	305	* PG_compound & ~PG_reclaim => Head page
d85f3385	306	*/
6d777953 CL	307
	308	#define PG_head_tail_mask ((1L << PG_compound) \| (1L << PG_reclaim))
	309
a62f735c	310	#define PageTail(page) (((page)->flags & PG_head_tail_mask) \
6d777953 CL	311	== PG_head_tail_mask)
	312
	313	static inline void __SetPageTail(struct page *page)
	314	{
	315	page->flags \|= PG_head_tail_mask;
	316	}
	317
	318	static inline void __ClearPageTail(struct page *page)
	319	{
	320	page->flags &= ~PG_head_tail_mask;
	321	}
	322
a62f735c	323	#define PageHead(page) (((page)->flags & PG_head_tail_mask) \
6d777953 CL	324	== (1L << PG_compound))
	325	#define __SetPageHead(page) __SetPageCompound(page)
	326	#define __ClearPageHead(page) __ClearPageCompound(page)
d85f3385	327
1da177e4 LT	328	#ifdef CONFIG_SWAP
	329	#define PageSwapCache(page) test_bit(PG_swapcache, &(page)->flags)
	330	#define SetPageSwapCache(page) set_bit(PG_swapcache, &(page)->flags)
	331	#define ClearPageSwapCache(page) clear_bit(PG_swapcache, &(page)->flags)
	332	#else
	333	#define PageSwapCache(page) 0
	334	#endif
	335
	336	#define PageUncached(page) test_bit(PG_uncached, &(page)->flags)
	337	#define SetPageUncached(page) set_bit(PG_uncached, &(page)->flags)
	338	#define ClearPageUncached(page) clear_bit(PG_uncached, &(page)->flags)
	339
	340	struct page; /* forward declaration */
	341
fba2591b LT	342	extern void cancel_dirty_page(struct page *page, unsigned int account_size);
fba2591b LT	343
1da177e4 LT	344	int test_clear_page_writeback(struct page *page);
	345	int test_set_page_writeback(struct page *page);
	346
1da177e4 LT	347	static inline void set_page_writeback(struct page *page)
	348	{
	349	test_set_page_writeback(page);
	350	}
	351
9223b419	352	#endif /* !__GENERATING_BOUNDS_H */
1da177e4	353	#endif /* PAGE_FLAGS_H */