diff options
| author | Andrew Morton <akpm@osdl.org> | 2006-06-23 02:03:06 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-23 07:42:46 -0700 |
| commit | f886ed443fedb109e2062988bf120a531f0ec80a (patch) | |
| tree | 379858e1b4fc28c266f041902477ee41069171e4 /include/linux/page-flags.h | |
| parent | 729bd0b74ce9ac6c829109052fcd565f5c366ca5 (diff) | |
| download | lwn-f886ed443fedb109e2062988bf120a531f0ec80a.tar.gz lwn-f886ed443fedb109e2062988bf120a531f0ec80a.zip | |
[PATCH] PG_uncached is ia64 only
As Nick points out, only ia64 uses PG_uncached. So we can push it up into the
higher bits of the lower half of page->flags and make room for another flag on
32-bit machines.
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Jesse Barnes <jbarnes@sgi.com>
Cc: Jes Sorensen <jes@trained-monkey.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/page-flags.h')
| -rw-r--r-- | include/linux/page-flags.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index d276a4e2f825..0c076d58c676 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -7,6 +7,8 @@ #include <linux/percpu.h> #include <linux/cache.h> +#include <linux/types.h> + #include <asm/pgtable.h> /* @@ -88,7 +90,17 @@ #define PG_nosave_free 18 /* Free, should not be written */ #define PG_buddy 19 /* Page is free, on buddy lists */ -#define PG_uncached 20 /* Page has been mapped as uncached */ + +#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 /* * Global page accounting. One instance per CPU. Only unsigned longs are |