drivers/base: move memory_block_add_nid() into the caller

Now the node id only needs to be set for early memory, so move
memory_block_add_nid() into the caller and rename it into
memory_block_add_nid_early().  This allows us to further simplify the code
by dropping the 'context' argument to
do_register_memory_block_under_node().

Link: https://lkml.kernel.org/r/[email protected]
Suggested-by: David Hildenbrand <[email protected]>
Signed-off-by: Hannes Reinecke <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Acked-by: Oscar Salvador <[email protected]>
Reviewed-by: Donet Tom <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Hannes Reinecke

drivers/base/memory.c

@@ -769,21 +769,22 @@ static struct zone *early_node_zone_for_memory_block(struct memory_block *mem,
 
 #ifdef CONFIG_NUMA
 /**
- * memory_block_add_nid() - Indicate that system RAM falling into this memory
- *			    block device (partially) belongs to the given node.
+ * memory_block_add_nid_early() - Indicate that early system RAM falling into
+ *				  this memory block device (partially) belongs
+ *				  to the given node.
  * @mem: The memory block device.
  * @nid: The node id.
- * @context: The memory initialization context.
  *
- * Indicate that system RAM falling into this memory block (partially) belongs
- * to the given node. If the context indicates ("early") that we are adding the
- * node during node device subsystem initialization, this will also properly
- * set/adjust mem->zone based on the zone ranges of the given node.
+ * Indicate that early system RAM falling into this memory block (partially)
+ * belongs to the given node. This will also properly set/adjust mem->zone based
+ * on the zone ranges of the given node.
+ *
+ * Memory hotplug handles this on memory block creation, where we can only have
+ * a single nid span a memory block.
  */
-void memory_block_add_nid(struct memory_block *mem, int nid,
-			  enum meminit_context context)
+void memory_block_add_nid_early(struct memory_block *mem, int nid)
 {
-	if (context == MEMINIT_EARLY && mem->nid != nid) {
+	if (mem->nid != nid) {
 		/*
 		 * For early memory we have to determine the zone when setting
 		 * the node id and handle multiple nodes spanning a single
@@ -797,15 +798,14 @@ void memory_block_add_nid(struct memory_block *mem, int nid,
 			mem->zone = early_node_zone_for_memory_block(mem, nid);
 		else
 			mem->zone = NULL;
+		/*
+		 * If this memory block spans multiple nodes, we only indicate
+		 * the last processed node. If we span multiple nodes (not applicable
+		 * to hotplugged memory), zone == NULL will prohibit memory offlining
+		 * and consequently unplug.
+		 */
+		mem->nid = nid;
 	}
-
-	/*
-	 * If this memory block spans multiple nodes, we only indicate
-	 * the last processed node. If we span multiple nodes (not applicable
-	 * to hotplugged memory), zone == NULL will prohibit memory offlining
-	 * and consequently unplug.
-	 */
-	mem->nid = nid;
 }
 #endif
 

drivers/base/node.c

@@ -781,13 +781,10 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 
 #ifdef CONFIG_MEMORY_HOTPLUG
 static void do_register_memory_block_under_node(int nid,
-						struct memory_block *mem_blk,
-						enum meminit_context context)
+						struct memory_block *mem_blk)
 {
 	int ret;
 
-	memory_block_add_nid(mem_blk, nid, context);
-
 	ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
 				       &mem_blk->dev.kobj,
 				       kobject_name(&mem_blk->dev.kobj));
@@ -815,7 +812,7 @@ static int register_mem_block_under_node_hotplug(struct memory_block *mem_blk,
 {
 	int nid = *(int *)arg;
 
-	do_register_memory_block_under_node(nid, mem_blk, MEMINIT_HOTPLUG);
+	do_register_memory_block_under_node(nid, mem_blk);
 	return 0;
 }
 
@@ -855,7 +852,8 @@ static void register_memory_blocks_under_nodes(void)
 			if (!mem)
 				continue;
 
-			do_register_memory_block_under_node(nid, mem, MEMINIT_EARLY);
+			memory_block_add_nid_early(mem, nid);
+			do_register_memory_block_under_node(nid, mem);
 			put_device(&mem->dev);
 		}
 

include/linux/memory.h

@@ -202,8 +202,7 @@ static inline unsigned long phys_to_block_id(unsigned long phys)
 }
 
 #ifdef CONFIG_NUMA
-void memory_block_add_nid(struct memory_block *mem, int nid,
-			  enum meminit_context context);
+void memory_block_add_nid_early(struct memory_block *mem, int nid);
 #endif /* CONFIG_NUMA */
 int memory_block_advise_max_size(unsigned long size);
 unsigned long memory_block_advised_max_size(void);