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[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>
This commit is contained in:
Andrew Morton 2006-06-23 02:03:06 -07:00 committed by Linus Torvalds
parent 729bd0b74c
commit f886ed443f
1 changed files with 13 additions and 1 deletions
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14
include/linux/page-flags.h
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@ -7,6 +7,8 @@
#include <linux/percpu.h> #include <linux/percpu.h>
#include <linux/cache.h> #include <linux/cache.h>
#include <linux/types.h>
#include <asm/pgtable.h> #include <asm/pgtable.h>
/* /*
@ -88,7 +90,17 @@
#define PG_nosave_free 18 /* Free, should not be written */ #define PG_nosave_free 18 /* Free, should not be written */
#define PG_buddy 19 /* Page is free, on buddy lists */ #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 * Global page accounting. One instance per CPU. Only unsigned longs are