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-rw-r--r--mm/memory_hotplug.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6cdeabe..83d37a4 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -164,13 +164,65 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
return 0;
}
+static pg_data_t *hotadd_new_pgdat(int nid, u64 start)
+{
+ struct pglist_data *pgdat;
+ unsigned long zones_size[MAX_NR_ZONES] = {0};
+ unsigned long zholes_size[MAX_NR_ZONES] = {0};
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+
+ pgdat = arch_alloc_nodedata(nid);
+ if (!pgdat)
+ return NULL;
+
+ arch_refresh_nodedata(nid, pgdat);
+
+ /* we can use NODE_DATA(nid) from here */
+
+ /* init node's zones as empty zones, we don't have any present pages.*/
+ free_area_init_node(nid, pgdat, zones_size, start_pfn, zholes_size);
+
+ return pgdat;
+}
+
+static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
+{
+ arch_refresh_nodedata(nid, NULL);
+ arch_free_nodedata(pgdat);
+ return;
+}
+
int add_memory(int nid, u64 start, u64 size)
{
+ pg_data_t *pgdat = NULL;
+ int new_pgdat = 0;
int ret;
+ if (!node_online(nid)) {
+ pgdat = hotadd_new_pgdat(nid, start);
+ if (!pgdat)
+ return -ENOMEM;
+ new_pgdat = 1;
+ ret = kswapd_run(nid);
+ if (ret)
+ goto error;
+ }
+
/* call arch's memory hotadd */
ret = arch_add_memory(nid, start, size);
+ if (ret < 0)
+ goto error;
+
+ /* we online node here. we have no error path from here. */
+ node_set_online(nid);
+
+ return ret;
+error:
+ /* rollback pgdat allocation and others */
+ if (new_pgdat)
+ rollback_node_hotadd(nid, pgdat);
+
return ret;
}
EXPORT_SYMBOL_GPL(add_memory);
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