mm,memory_hotplug: remove status_change_nid_normal and update documentation

Now that the last user of status_change_nid_normal is gone, we can remove
it.  Update documentation accordingly.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Oscar Salvador <[email protected]>
Reviewed-by: Vlastimil Babka <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Cc: Harry Yoo <[email protected]>
Cc: Hyeonggon Yoo <[email protected]>
Cc: Joanthan Cameron <[email protected]>
Cc: Rakie Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Documentation/core-api/memory-hotplug.rst

@@ -56,14 +56,11 @@ The third argument (arg) passes a pointer of struct memory_notify::
 	struct memory_notify {
 		unsigned long start_pfn;
 		unsigned long nr_pages;
-		int status_change_nid_normal;
 		int status_change_nid;
 	}
 
 - start_pfn is start_pfn of online/offline memory.
 - nr_pages is # of pages of online/offline memory.
-- status_change_nid_normal is set node id when N_NORMAL_MEMORY of nodemask
-  is (will be) set/clear, if this is -1, then nodemask status is not changed.
 - status_change_nid is set node id when N_MEMORY of nodemask is (will be)
   set/clear. It means a new(memoryless) node gets new memory by online and a
   node loses all memory. If this is -1, then nodemask status is not changed.

Documentation/translations/zh_CN/core-api/memory-hotplug.rst

@@ -62,7 +62,6 @@ memory_notify结构体的指针::
 	struct memory_notify {
 		unsigned long start_pfn;
 		unsigned long nr_pages;
-		int status_change_nid_normal;
 		int status_change_nid;
 	}
 
@@ -70,8 +69,6 @@ memory_notify结构体的指针::
 
 - nr_pages是在线/离线内存的页数。
 
-- status_change_nid_normal是当nodemask的N_NORMAL_MEMORY被设置/清除时设置节
-  点id，如果是-1，则nodemask状态不改变。
 
 - status_change_nid是当nodemask的N_MEMORY被（将）设置/清除时设置的节点id。这
   意味着一个新的（没上线的）节点通过联机获得新的内存，而一个节点失去了所有的内

include/linux/memory.h

@@ -109,7 +109,6 @@ struct memory_notify {
 	unsigned long altmap_nr_pages;
 	unsigned long start_pfn;
 	unsigned long nr_pages;
-	int status_change_nid_normal;
 	int status_change_nid;
 };
 

mm/memory_hotplug.c

@@ -706,19 +706,13 @@ static void node_states_check_changes_online(unsigned long nr_pages,
 	int nid = zone_to_nid(zone);
 
 	arg->status_change_nid = NUMA_NO_NODE;
-	arg->status_change_nid_normal = NUMA_NO_NODE;
 
 	if (!node_state(nid, N_MEMORY))
 		arg->status_change_nid = nid;
-	if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY))
-		arg->status_change_nid_normal = nid;
 }
 
 static void node_states_set_node(int node, struct memory_notify *arg)
 {
-	if (arg->status_change_nid_normal >= 0)
-		node_set_state(node, N_NORMAL_MEMORY);
-
 	if (arg->status_change_nid >= 0)
 		node_set_state(node, N_MEMORY);
 }
@@ -1894,7 +1888,6 @@ static void node_states_check_changes_offline(unsigned long nr_pages,
 	enum zone_type zt;
 
 	arg->status_change_nid = NUMA_NO_NODE;
-	arg->status_change_nid_normal = NUMA_NO_NODE;
 
 	/*
 	 * Check whether node_states[N_NORMAL_MEMORY] will be changed.
@@ -1906,8 +1899,6 @@ static void node_states_check_changes_offline(unsigned long nr_pages,
 	 */
 	for (zt = 0; zt <= ZONE_NORMAL; zt++)
 		present_pages += pgdat->node_zones[zt].present_pages;
-	if (zone_idx(zone) <= ZONE_NORMAL && nr_pages >= present_pages)
-		arg->status_change_nid_normal = zone_to_nid(zone);
 
 	/*
 	 * We have accounted the pages from [0..ZONE_NORMAL); ZONE_HIGHMEM
@@ -1926,9 +1917,6 @@ static void node_states_check_changes_offline(unsigned long nr_pages,
 
 static void node_states_clear_node(int node, struct memory_notify *arg)
 {
-	if (arg->status_change_nid_normal >= 0)
-		node_clear_state(node, N_NORMAL_MEMORY);
-
 	if (arg->status_change_nid >= 0)
 		node_clear_state(node, N_MEMORY);
 }