[PATCH] catch valid mem range at onlining memory

This patch allows hot-add memory which is not aligned to section.

Now, hot-added memory has to be aligned to section size.  Considering big
section sized archs, this is not useful.

When hot-added memory is registerd as iomem resoruce by iomem resource
patch, we can make use of that information to detect valid memory range.

Note: With this, not-aligned memory can be registerd. To allow hot-add
      memory with holes, we have to do more work around add_memory().
      (It doesn't allows add memory to already existing mem section.)

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index cd6bd00..edfc733 100644 (file)
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -105,6 +105,9 @@ extern int allocate_resource(struct resource *root, struct resource *new,
 int adjust_resource(struct resource *res, unsigned long start,
                    unsigned long size);
 
+/* get registered SYSTEM_RAM resources in specified area */
+extern int find_next_system_ram(struct resource *res);
+
 /* Convenience shorthand with allocation */
 #define request_region(start,n,name)   __request_region(&ioport_resource, (start), (n), (name))
 #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name))

diff --git a/kernel/resource.c b/kernel/resource.c
index e3080fc..2404f9b 100644 (file)
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -232,6 +232,44 @@ int release_resource(struct resource *old)
 
 EXPORT_SYMBOL(release_resource);
 
+#ifdef CONFIG_MEMORY_HOTPLUG
+/*
+ * Finds the lowest memory reosurce exists within [res->start.res->end)
+ * the caller must specify res->start, res->end, res->flags.
+ * If found, returns 0, res is overwritten, if not found, returns -1.
+ */
+int find_next_system_ram(struct resource *res)
+{
+       resource_size_t start, end;
+       struct resource *p;
+
+       BUG_ON(!res);
+
+       start = res->start;
+       end = res->end;
+
+       read_lock(&resource_lock);
+       for (p = iomem_resource.child; p ; p = p->sibling) {
+               /* system ram is just marked as IORESOURCE_MEM */
+               if (p->flags != res->flags)
+                       continue;
+               if (p->start > end) {
+                       p = NULL;
+                       break;
+               }
+               if (p->start >= start)
+                       break;
+       }
+       read_unlock(&resource_lock);
+       if (!p)
+               return -1;
+       /* copy data */
+       res->start = p->start;
+       res->end = p->end;
+       return 0;
+}
+#endif
+
 /*
  * Find empty slot in the resource tree given range and alignment.
  */

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0b11a85..f13783e 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;