[PATCH] catch valid mem range at onlining memory

[linux-2.6-omap-h63xx.git] / mm / memory_hotplug.c

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0b11a85434415b69064c26ede9669788920101d8..f13783e81eb6b8caefac5854477a3f0a096716cf 100644 (file)
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -127,6 +127,9 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
        unsigned long i;
        unsigned long flags;
        unsigned long onlined_pages = 0;
+       struct resource res;
+       u64 section_end;
+       unsigned long start_pfn;
        struct zone *zone;
        int need_zonelists_rebuild = 0;
 
@@ -149,10 +152,27 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
        if (!populated_zone(zone))
                need_zonelists_rebuild = 1;
 
-       for (i = 0; i < nr_pages; i++) {
-               struct page *page = pfn_to_page(pfn + i);
-               online_page(page);
-               onlined_pages++;
+       res.start = (u64)pfn << PAGE_SHIFT;
+       res.end = res.start + ((u64)nr_pages << PAGE_SHIFT) - 1;
+       res.flags = IORESOURCE_MEM; /* we just need system ram */
+       section_end = res.end;
+
+       while (find_next_system_ram(&res) >= 0) {
+               start_pfn = (unsigned long)(res.start >> PAGE_SHIFT);
+               nr_pages = (unsigned long)
+                           ((res.end + 1 - res.start) >> PAGE_SHIFT);
+
+               if (PageReserved(pfn_to_page(start_pfn))) {
+                       /* this region's page is not onlined now */
+                       for (i = 0; i < nr_pages; i++) {
+                               struct page *page = pfn_to_page(start_pfn + i);
+                               online_page(page);
+                               onlined_pages++;
+                       }
+               }
+
+               res.start = res.end + 1;
+               res.end = section_end;
        }
        zone->present_pages += onlined_pages;
        zone->zone_pgdat->node_present_pages += onlined_pages;