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-rw-r--r--mm/memory_hotplug.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0b11a8543441..f13783e81eb6 100644
--- 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;