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| author | Christoph Lameter <clameter@sgi.com> | 2008-04-28 02:12:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-28 08:58:21 -0700 |
| commit | e26831814998cee8e6d9f0a9854cb46c516f5547 (patch) | |
| tree | fb3dcd791ceaac8b04fdcc853c4839b032e64733 /include/linux/page-flags.h | |
| parent | bf2ae2b37c06cc9fb6fc03d99617f1161939980f (diff) | |
| download | lwn-e26831814998cee8e6d9f0a9854cb46c516f5547.tar.gz lwn-e26831814998cee8e6d9f0a9854cb46c516f5547.zip | |
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: Christoph 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/page-flags.h')
| -rw-r--r-- | include/linux/page-flags.h | 56 |
1 files changed, 26 insertions, 30 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index b5b30f1c1e59..d66971530caa 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -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 */ - -/* 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 */ +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) /* @@ -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 |