mm: hugetlb: simplify per-node sysfs creation and removal

Patch series "simplify handling of per-node sysfs creation and removal",
v4.


This patch (of 2):

The following commit offload per-node sysfs creation and removal to a
kworker and did not say why it is needed.  And it also said "I don't know
that this is absolutely required".  It seems like the author was not sure
as well.  Since it only complicates the code, this patch will revert the
changes to simplify the code.

  39da08cb074c ("hugetlb: offload per node attribute registrations")

We could use memory hotplug notifier to do per-node sysfs creation and
removal instead of inserting those operations to node registration and
unregistration.  Then, it can reduce the code coupling between node.c and
hugetlb.c.  Also, it can simplify the code.

Link: https://lkml.kernel.org/r/20220914072603.60293-1-songmuchun@bytedance.com
Link: https://lkml.kernel.org/r/20220914072603.60293-2-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 3 insertions, 136 deletions

diff --git a/drivers/base/node.c b/drivers/base/node.c
index eb0f43784c2b..ed391cb09999 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -587,64 +587,9 @@ static const struct attribute_group *node_dev_groups[] = {
 	NULL
 };
 
-#ifdef CONFIG_HUGETLBFS
-/*
- * hugetlbfs per node attributes registration interface:
- * When/if hugetlb[fs] subsystem initializes [sometime after this module],
- * it will register its per node attributes for all online nodes with
- * memory.  It will also call register_hugetlbfs_with_node(), below, to
- * register its attribute registration functions with this node driver.
- * Once these hooks have been initialized, the node driver will call into
- * the hugetlb module to [un]register attributes for hot-plugged nodes.
- */
-static node_registration_func_t __hugetlb_register_node;
-static node_registration_func_t __hugetlb_unregister_node;
-
-static inline bool hugetlb_register_node(struct node *node)
-{
-	if (__hugetlb_register_node &&
-			node_state(node->dev.id, N_MEMORY)) {
-		__hugetlb_register_node(node);
-		return true;
-	}
-	return false;
-}
-
-static inline void hugetlb_unregister_node(struct node *node)
-{
-	if (__hugetlb_unregister_node)
-		__hugetlb_unregister_node(node);
-}
-
-void register_hugetlbfs_with_node(node_registration_func_t doregister,
-				  node_registration_func_t unregister)
-{
-	__hugetlb_register_node   = doregister;
-	__hugetlb_unregister_node = unregister;
-}
-#else
-static inline void hugetlb_register_node(struct node *node) {}
-
-static inline void hugetlb_unregister_node(struct node *node) {}
-#endif
-
 static void node_device_release(struct device *dev)
 {
-	struct node *node = to_node(dev);
-
-#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_HUGETLBFS)
-	/*
-	 * We schedule the work only when a memory section is
-	 * onlined/offlined on this node. When we come here,
-	 * all the memory on this node has been offlined,
-	 * so we won't enqueue new work to this work.
-	 *
-	 * The work is using node->node_work, so we should
-	 * flush work before freeing the memory.
-	 */
-	flush_work(&node->node_work);
-#endif
-	kfree(node);
+	kfree(to_node(dev));
 }
 
 /*
@@ -665,11 +610,9 @@ static int register_node(struct node *node, int num)
 
 	if (error)
 		put_device(&node->dev);
-	else {
-		hugetlb_register_node(node);
-
+	else
 		compaction_register_node(node);
-	}
+
 	return error;
 }
 
@@ -683,7 +626,6 @@ static int register_node(struct node *node, int num)
 void unregister_node(struct node *node)
 {
 	compaction_unregister_node(node);
-	hugetlb_unregister_node(node);		/* no-op, if memoryless node */
 	node_remove_accesses(node);
 	node_remove_caches(node);
 	device_unregister(&node->dev);
@@ -905,74 +847,8 @@ void register_memory_blocks_under_node(int nid, unsigned long start_pfn,
 			   (void *)&nid, func);
 	return;
 }
-
-#ifdef CONFIG_HUGETLBFS
-/*
- * Handle per node hstate attribute [un]registration on transistions
- * to/from memoryless state.
- */
-static void node_hugetlb_work(struct work_struct *work)
-{
-	struct node *node = container_of(work, struct node, node_work);
-
-	/*
-	 * We only get here when a node transitions to/from memoryless state.
-	 * We can detect which transition occurred by examining whether the
-	 * node has memory now.  hugetlb_register_node() already check this
-	 * so we try to register the attributes.  If that fails, then the
-	 * node has transitioned to memoryless, try to unregister the
-	 * attributes.
-	 */
-	if (!hugetlb_register_node(node))
-		hugetlb_unregister_node(node);
-}
-
-static void init_node_hugetlb_work(int nid)
-{
-	INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
-}
-
-static int node_memory_callback(struct notifier_block *self,
-				unsigned long action, void *arg)
-{
-	struct memory_notify *mnb = arg;
-	int nid = mnb->status_change_nid;
-
-	switch (action) {
-	case MEM_ONLINE:
-	case MEM_OFFLINE:
-		/*
-		 * offload per node hstate [un]registration to a work thread
-		 * when transitioning to/from memoryless state.
-		 */
-		if (nid != NUMA_NO_NODE)
-			schedule_work(&node_devices[nid]->node_work);
-		break;
-
-	case MEM_GOING_ONLINE:
-	case MEM_GOING_OFFLINE:
-	case MEM_CANCEL_ONLINE:
-	case MEM_CANCEL_OFFLINE:
-	default:
-		break;
-	}
-
-	return NOTIFY_OK;
-}
-#endif	/* CONFIG_HUGETLBFS */
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
-#if !defined(CONFIG_MEMORY_HOTPLUG) || !defined(CONFIG_HUGETLBFS)
-static inline int node_memory_callback(struct notifier_block *self,
-				unsigned long action, void *arg)
-{
-	return NOTIFY_OK;
-}
-
-static void init_node_hugetlb_work(int nid) { }
-
-#endif
-
 int __register_one_node(int nid)
 {
 	int error;
@@ -991,8 +867,6 @@ int __register_one_node(int nid)
 	}
 
 	INIT_LIST_HEAD(&node_devices[nid]->access_list);
-	/* initialize work queue for memory hot plug */
-	init_node_hugetlb_work(nid);
 	node_init_caches(nid);
 
 	return error;
@@ -1063,13 +937,8 @@ static const struct attribute_group *cpu_root_attr_groups[] = {
 	NULL,
 };
 
-#define NODE_CALLBACK_PRI	2	/* lower than SLAB */
 void __init node_dev_init(void)
 {
-	static struct notifier_block node_memory_callback_nb = {
-		.notifier_call = node_memory_callback,
-		.priority = NODE_CALLBACK_PRI,
-	};
 	int ret, i;
 
  	BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
@@ -1079,8 +948,6 @@ void __init node_dev_init(void)
 	if (ret)
 		panic("%s() failed to register subsystem: %d\n", __func__, ret);
 
-	register_hotmemory_notifier(&node_memory_callback_nb);
-
 	/*
 	 * Create all node devices, which will properly link the node
 	 * to applicable memory block devices and already created cpu devices.