Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / mm / mmzone.c

diff --git a/kernel/mm/mmzone.c b/kernel/mm/mmzone.c
new file mode 100644 (file)
index 0000000..7d87ebb
--- /dev/null
+++ b/kernel/mm/mmzone.c
@@ -0,0 +1,114 @@
+/*
+ * linux/mm/mmzone.c
+ *
+ * management codes for pgdats, zones and page flags
+ */
+
+
+#include <linux/stddef.h>
+#include <linux/mm.h>
+#include <linux/mmzone.h>
+
+struct pglist_data *first_online_pgdat(void)
+{
+       return NODE_DATA(first_online_node);
+}
+
+struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
+{
+       int nid = next_online_node(pgdat->node_id);
+
+       if (nid == MAX_NUMNODES)
+               return NULL;
+       return NODE_DATA(nid);
+}
+
+/*
+ * next_zone - helper magic for for_each_zone()
+ */
+struct zone *next_zone(struct zone *zone)
+{
+       pg_data_t *pgdat = zone->zone_pgdat;
+
+       if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
+               zone++;
+       else {
+               pgdat = next_online_pgdat(pgdat);
+               if (pgdat)
+                       zone = pgdat->node_zones;
+               else
+                       zone = NULL;
+       }
+       return zone;
+}
+
+static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes)
+{
+#ifdef CONFIG_NUMA
+       return node_isset(zonelist_node_idx(zref), *nodes);
+#else
+       return 1;
+#endif /* CONFIG_NUMA */
+}
+
+/* Returns the next zone at or below highest_zoneidx in a zonelist */
+struct zoneref *next_zones_zonelist(struct zoneref *z,
+                                       enum zone_type highest_zoneidx,
+                                       nodemask_t *nodes)
+{
+       /*
+        * Find the next suitable zone to use for the allocation.
+        * Only filter based on nodemask if it's set
+        */
+       if (likely(nodes == NULL))
+               while (zonelist_zone_idx(z) > highest_zoneidx)
+                       z++;
+       else
+               while (zonelist_zone_idx(z) > highest_zoneidx ||
+                               (z->zone && !zref_in_nodemask(z, nodes)))
+                       z++;
+
+       return z;
+}
+
+#ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
+int memmap_valid_within(unsigned long pfn,
+                                       struct page *page, struct zone *zone)
+{
+       if (page_to_pfn(page) != pfn)
+               return 0;
+
+       if (page_zone(page) != zone)
+               return 0;
+
+       return 1;
+}
+#endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
+
+void lruvec_init(struct lruvec *lruvec)
+{
+       enum lru_list lru;
+
+       memset(lruvec, 0, sizeof(struct lruvec));
+
+       for_each_lru(lru)
+               INIT_LIST_HEAD(&lruvec->lists[lru]);
+}
+
+#if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS)
+int page_cpupid_xchg_last(struct page *page, int cpupid)
+{
+       unsigned long old_flags, flags;
+       int last_cpupid;
+
+       do {
+               old_flags = flags = page->flags;
+               last_cpupid = page_cpupid_last(page);
+
+               flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
+               flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
+       } while (unlikely(cmpxchg(&page->flags, old_flags, flags) != old_flags));
+
+       return last_cpupid;
+}
+#endif