diff options
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r-- | mm/memory_hotplug.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index b4c8d7b9ab82..449999657c0b 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1340,7 +1340,12 @@ static int online_memory_block(struct memory_block *mem, void *arg) return memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE); } -/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ +/* + * NOTE: The caller must call lock_device_hotplug() to serialize hotplug + * and online/offline operations (triggered e.g. by sysfs). + * + * we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG + */ int __ref add_memory_resource(int nid, struct resource *res, bool online) { u64 start, size; @@ -1418,9 +1423,9 @@ out: mem_hotplug_done(); return ret; } -EXPORT_SYMBOL_GPL(add_memory_resource); -int __ref add_memory(int nid, u64 start, u64 size) +/* requires device_hotplug_lock, see add_memory_resource() */ +int __ref __add_memory(int nid, u64 start, u64 size) { struct resource *res; int ret; @@ -1434,6 +1439,17 @@ int __ref add_memory(int nid, u64 start, u64 size) release_memory_resource(res); return ret; } + +int add_memory(int nid, u64 start, u64 size) +{ + int rc; + + lock_device_hotplug(); + rc = __add_memory(nid, start, size); + unlock_device_hotplug(); + + return rc; +} EXPORT_SYMBOL_GPL(add_memory); #ifdef CONFIG_MEMORY_HOTREMOVE |