[PATCH] mm: remove PG_highmem

Remove PG_highmem, to save a page flag.  Use is_highmem() instead.  It'll
generate a little more code, but we don't use PageHigheMem() in many places.

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 15 insertions, 16 deletions

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 39ab8c6b5652..df313891db10 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -61,21 +61,20 @@
 #define PG_active                6
 #define PG_slab                  7      /* slab debug (Suparna wants this) */
 
-#define PG_highmem               8
-#define PG_checked               9      /* kill me in 2.5.<early>. */
-#define PG_arch_1               10
-#define PG_reserved             11
-
-#define PG_private              12      /* Has something at ->private */
-#define PG_writeback            13      /* Page is under writeback */
-#define PG_nosave               14      /* Used for system suspend/resume */
-#define PG_compound             15      /* Part of a compound page */
-
-#define PG_swapcache            16      /* Swap page: swp_entry_t in private */
-#define PG_mappedtodisk         17      /* Has blocks allocated on-disk */
-#define PG_reclaim              18      /* To be reclaimed asap */
-#define PG_nosave_free          19      /* Free, should not be written */
-#define PG_uncached             20      /* Page has been mapped as uncached */
+#define PG_checked               8      /* kill me in 2.5.<early>. */
+#define PG_arch_1                9
+#define PG_reserved             10
+#define PG_private              11      /* Has something at ->private */
+
+#define PG_writeback            12      /* Page is under writeback */
+#define PG_nosave               13      /* Used for system suspend/resume */
+#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_nosave_free          18      /* Free, should not be written */
+#define PG_uncached             19      /* Page has been mapped as uncached */
 
 /*
  * Global page accounting.  One instance per CPU.  Only unsigned longs are
@@ -215,7 +214,7 @@ extern void __mod_page_state(unsigned offset, unsigned long delta);
 #define TestSetPageSlab(page)   test_and_set_bit(PG_slab, &(page)->flags)
 
 #ifdef CONFIG_HIGHMEM
-#define PageHighMem(page)       test_bit(PG_highmem, &(page)->flags)
+#define PageHighMem(page)       is_highmem(page_zone(page))
 #else
 #define PageHighMem(page)       0 /* needed to optimize away at compile time */
 #endif