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-rw-r--r--mm/memory_hotplug.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 01c9fb97c619..7d25cc12235f 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -76,15 +76,22 @@ int __add_pages(struct zone *zone, unsigned long phys_start_pfn,
{
unsigned long i;
int err = 0;
+ int start_sec, end_sec;
+ /* during initialize mem_map, align hot-added range to section */
+ start_sec = pfn_to_section_nr(phys_start_pfn);
+ end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1);
- for (i = 0; i < nr_pages; i += PAGES_PER_SECTION) {
- err = __add_section(zone, phys_start_pfn + i);
+ for (i = start_sec; i <= end_sec; i++) {
+ err = __add_section(zone, i << PFN_SECTION_SHIFT);
- /* We want to keep adding the rest of the
- * sections if the first ones already exist
+ /*
+ * EEXIST is finally dealed with by ioresource collision
+ * check. see add_memory() => register_memory_resource()
+ * Warning will be printed if there is collision.
*/
if (err && (err != -EEXIST))
break;
+ err = 0;
}
return err;
@@ -213,10 +220,10 @@ static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
}
/* add this memory to iomem resource */
-static void register_memory_resource(u64 start, u64 size)
+static int register_memory_resource(u64 start, u64 size)
{
struct resource *res;
-
+ int ret = 0;
res = kzalloc(sizeof(struct resource), GFP_KERNEL);
BUG_ON(!res);
@@ -228,7 +235,9 @@ static void register_memory_resource(u64 start, u64 size)
printk("System RAM resource %llx - %llx cannot be added\n",
(unsigned long long)res->start, (unsigned long long)res->end);
kfree(res);
+ ret = -EEXIST;
}
+ return ret;
}
@@ -269,7 +278,7 @@ int add_memory(int nid, u64 start, u64 size)
}
/* register this memory as resource */
- register_memory_resource(start, size);
+ ret = register_memory_resource(start, size);
return ret;
error: