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Commit f886ed44 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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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: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 729bd0b7

include/linux/page-flags.h

+13 −1
Original line number Diff line number Diff line
@@ -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