[PATCH] mm: move determination of policy_zone into page allocator

Currently the function to build a zonelist for a BIND policy has the side
effect to set the policy_zone.  This seems to be a bit strange.  policy
zone seems to not be initialized elsewhere and therefore 0.  Do we police
ZONE_DMA if no bind policy has been used yet?

This patch moves the determination of the zone to apply policies to into
the page allocator.  We determine the zone while building the zonelist for
nodes.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 5 insertions, 12 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 96714e2646ad..0f1d2b8a952b 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -93,7 +93,7 @@ static kmem_cache_t *sn_cache;
 
 /* Highest zone. An specific allocation for a zone below that is not
    policied. */
-static int policy_zone;
+int policy_zone = ZONE_DMA;
 
 struct mempolicy default_policy = {
         .refcnt = ATOMIC_INIT(1), /* never free it */
@@ -131,17 +131,8 @@ static struct zonelist *bind_zonelist(nodemask_t *nodes)
         if (!zl)
                 return NULL;
         num = 0;
-        for_each_node_mask(nd, *nodes) {
-                int k;
-                for (k = MAX_NR_ZONES-1; k >= 0; k--) {
-                        struct zone *z = &NODE_DATA(nd)->node_zones[k];
-                        if (!z->present_pages)
-                                continue;
-                        zl->zones[num++] = z;
-                        if (k > policy_zone)
-                                policy_zone = k;
-                }
-        }
+        for_each_node_mask(nd, *nodes)
+                zl->zones[num++] = &NODE_DATA(nd)->node_zones[policy_zone];
         zl->zones[num] = NULL;
         return zl;
 }
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7adc9526d329..512e3f4d4963 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -36,6 +36,7 @@
 #include <linux/memory_hotplug.h>
 #include <linux/nodemask.h>
 #include <linux/vmalloc.h>
+#include <linux/mempolicy.h>
 
 #include <asm/tlbflush.h>
 #include "internal.h"
@@ -1470,6 +1471,7 @@ static int __init build_zonelists_node(pg_data_t *pgdat,
                         BUG_ON(zone - pgdat->node_zones > ZONE_NORMAL);
 #endif
                         zonelist->zones[j++] = zone;
+                        check_highest_zone(k);
                 }
         }
         return j;