Driver core / MM: Drop offline_memory_block()

Since offline_memory_block(mem) is functionally equivalent to
device_offline(&mem->dev), make the only caller of the former use
the latter instead and drop offline_memory_block() entirely.
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: NToshi Kani <toshi.kani@hp.com>

drivers/base/memory.c

@@ -728,27 +728,6 @@ int unregister_memory_section(struct mem_section *section)
 }
 #endif /* CONFIG_MEMORY_HOTREMOVE */
 
-/*
- * offline one memory block. If the memory block has been offlined, do nothing.
- *
- * Call under device_hotplug_lock.
- */
-int offline_memory_block(struct memory_block *mem)
-{
-	int ret = 0;
-
-	mutex_lock(&mem->state_mutex);
-	if (mem->state != MEM_OFFLINE) {
-		ret = __memory_block_change_state_uevent(mem, MEM_OFFLINE,
-							 MEM_ONLINE, -1);
-		if (!ret)
-			mem->dev.offline = true;
-	}
-	mutex_unlock(&mem->state_mutex);
-
-	return ret;
-}
-
 /* return true if the memory block is offlined, otherwise, return false */
 bool is_memblock_offlined(struct memory_block *mem)
 {

include/linux/memory_hotplug.h

@@ -251,7 +251,6 @@ extern int mem_online_node(int nid);
 extern int add_memory(int nid, u64 start, u64 size);
 extern int arch_add_memory(int nid, u64 start, u64 size);
 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
-extern int offline_memory_block(struct memory_block *mem);
 extern bool is_memblock_offlined(struct memory_block *mem);
 extern int remove_memory(int nid, u64 start, u64 size);
 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,

mm/memory_hotplug.c

@@ -1680,7 +1680,7 @@ int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
 static int offline_memory_block_cb(struct memory_block *mem, void *arg)
 {
 	int *ret = arg;
-	int error = offline_memory_block(mem);
+	int error = device_offline(&mem->dev);
 
 	if (error != 0 && *ret == 0)
 		*ret = error;