From: Andrew Morton <akpm@osdl.org>
Date: Fri, 23 Jun 2006 09:03:06 +0000 (-0700)
Subject: [PATCH] PG_uncached is ia64 only
X-Git-Tag: v2.6.18-rc1~1081^2~210
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f886ed443fedb109e2062988bf120a531f0ec80a;p=linux-2.6

[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>
---

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index d276a4e2f8..0c076d58c6 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