mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-30 16:13:54 +08:00
04293355ac
Remove the two page flags that were previously used by swsusp and are no longer needed. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
286 lines
10 KiB
C
286 lines
10 KiB
C
/*
|
|
* Macros for manipulating and testing page->flags
|
|
*/
|
|
|
|
#ifndef PAGE_FLAGS_H
|
|
#define PAGE_FLAGS_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/mm_types.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
|
|
* (N-FLAGS_RESERVED)
|
|
*
|
|
* The fields area is reserved for fields mapping zone, node and SPARSEMEM
|
|
* section. The boundry between these two areas is defined by
|
|
* FLAGS_RESERVED which defines the width of the fields section
|
|
* (see linux/mmzone.h). New flags must _not_ overlap with this area.
|
|
*/
|
|
#define PG_locked 0 /* Page is locked. Don't touch. */
|
|
#define PG_error 1
|
|
#define PG_referenced 2
|
|
#define PG_uptodate 3
|
|
|
|
#define PG_dirty 4
|
|
#define PG_lru 5
|
|
#define PG_active 6
|
|
#define PG_slab 7 /* slab debug (Suparna wants this) */
|
|
|
|
#define PG_owner_priv_1 8 /* Owner use. If pagecache, fs may use*/
|
|
#define PG_arch_1 9
|
|
#define PG_reserved 10
|
|
#define PG_private 11 /* If pagecache, has fs-private data */
|
|
|
|
#define PG_writeback 12 /* Page is under writeback */
|
|
#define PG_compound 14 /* Part of a compound page */
|
|
#define PG_swapcache 15 /* Swap page: swp_entry_t in private */
|
|
|
|
#define PG_mappedtodisk 16 /* Has blocks allocated on-disk */
|
|
#define PG_reclaim 17 /* To be reclaimed asap */
|
|
#define PG_buddy 19 /* Page is free, on buddy lists */
|
|
|
|
/* PG_owner_priv_1 users should have descriptive aliases */
|
|
#define PG_checked PG_owner_priv_1 /* Used by some filesystems */
|
|
|
|
#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
|
|
*/
|
|
#define PG_uncached 31 /* Page has been mapped as uncached */
|
|
#endif
|
|
|
|
/*
|
|
* 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)
|
|
|
|
#define PageUptodate(page) test_bit(PG_uptodate, &(page)->flags)
|
|
#ifdef CONFIG_S390
|
|
static inline void SetPageUptodate(struct page *page)
|
|
{
|
|
if (!test_and_set_bit(PG_uptodate, &page->flags))
|
|
page_clear_dirty(page);
|
|
}
|
|
#else
|
|
#define SetPageUptodate(page) 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 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)
|
|
|
|
#define PageWriteback(page) test_bit(PG_writeback, &(page)->flags)
|
|
#define SetPageWriteback(page) \
|
|
do { \
|
|
if (!test_and_set_bit(PG_writeback, \
|
|
&(page)->flags)) \
|
|
inc_zone_page_state(page, NR_WRITEBACK); \
|
|
} while (0)
|
|
#define TestSetPageWriteback(page) \
|
|
({ \
|
|
int ret; \
|
|
ret = test_and_set_bit(PG_writeback, \
|
|
&(page)->flags); \
|
|
if (!ret) \
|
|
inc_zone_page_state(page, NR_WRITEBACK); \
|
|
ret; \
|
|
})
|
|
#define ClearPageWriteback(page) \
|
|
do { \
|
|
if (test_and_clear_bit(PG_writeback, \
|
|
&(page)->flags)) \
|
|
dec_zone_page_state(page, NR_WRITEBACK); \
|
|
} while (0)
|
|
#define TestClearPageWriteback(page) \
|
|
({ \
|
|
int ret; \
|
|
ret = test_and_clear_bit(PG_writeback, \
|
|
&(page)->flags); \
|
|
if (ret) \
|
|
dec_zone_page_state(page, NR_WRITEBACK); \
|
|
ret; \
|
|
})
|
|
|
|
#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 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 /* PAGE_FLAGS_H */
|