diff options
| -rw-r--r-- | mm/memory_hotplug.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 6cdeabe9f6d4..83d37a401b3b 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); |