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Commit e2683181 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

pageflags: use an enum for the flags 



Use an enum to ease the maintenance of page flags.  This is going to change
the numbering from 0 to 18.

Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent bf2ae2b3

include/linux/page-flags.h

+26 −30
Original line number Diff line number Diff line
@@ -67,35 +67,29 @@ 
 * 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 */



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 */

#define PG_readahead		PG_reclaim /* Reminder to do async read-ahead */



/* PG_owner_priv_1 users should have descriptive aliases */

#define PG_checked		PG_owner_priv_1 /* Used by some filesystems */

#define PG_pinned		PG_owner_priv_1	/* Xen pinned pagetable */

	PG_readahead = PG_reclaim, /* Reminder to do async read-ahead */

	PG_buddy,		/* Page is free, on buddy lists */



#if (BITS_PER_LONG > 32)

/*
@@ -105,8 +99,10 @@ 
 * 64 bit  |           FIELDS             | ??????         FLAGS         |

 *         63                            32                              0

 */

#define PG_uncached		31	/* Page has been mapped as uncached */

	PG_uncached = 31,		/* Page has been mapped as uncached */

#endif

	NR_PAGEFLAGS

};



/*

 * Manipulation of page state flags