[171/227] drivers/base/node: consolidate node device subsystem initialization in node_dev_init()

Commit Message

Andrew Morton March 22, 2022, 9:47 p.m. UTC

From: David Hildenbrand <[e-mail]>
Subject: drivers/base/node: consolidate node device subsystem initialization in node_dev_init()

...  and call node_dev_init() after memory_dev_init() from driver_init(),
so before any of the existing arch/subsys calls.  All online nodes should
be known at that point: early during boot, arch code determines node and
zone ranges and sets the relevant nodes online; usually this happens in
setup_arch().

This is in line with memory_dev_init(), which initializes the memory
device subsystem and creates all memory block devices.

Similar to memory_dev_init(), panic() if anything goes wrong, we don't
want to continue with such basic initialization errors.

The important part is that node_dev_init() gets called after
memory_dev_init() and after cpu_dev_init(), but before any of the relevant
archs call register_cpu() to register the new cpu device under the node
device.  The latter should be the case for the current users of
topology_init().

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: David Hildenbrand <[e-mail]>
Reviewed-by: Oscar Salvador <[e-mail]>
Tested-by: Anatoly Pugachev <[e-mail]> (sparc64)
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: Oscar Salvador <[e-mail]>
Cc: Mike Rapoport <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: Thomas Bogendoerfer <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Benjamin Herrenschmidt <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Paul Walmsley <[e-mail]>
Cc: Palmer Dabbelt <[e-mail]>
Cc: Albert Ou <[e-mail]>
Cc: Heiko Carstens <[e-mail]>
Cc: Vasily Gorbik <[e-mail]>
Cc: Yoshinori Sato <[e-mail]>
Cc: Rich Felker <[e-mail]>
Cc: "David S. Miller" <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Dave Hansen <[e-mail]>
Cc: "Rafael J. Wysocki" <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 arch/arm64/kernel/setup.c   |    3 ---
 arch/ia64/kernel/topology.c |   10 ----------
 arch/mips/kernel/topology.c |    5 -----
 arch/powerpc/kernel/sysfs.c |   17 -----------------
 arch/riscv/kernel/setup.c   |    3 ---
 arch/s390/kernel/numa.c     |    7 -------
 arch/sh/kernel/topology.c   |    5 -----
 arch/sparc/kernel/sysfs.c   |   12 ------------
 arch/x86/kernel/topology.c  |    5 -----
 drivers/base/init.c         |    1 +
 drivers/base/node.c         |   30 +++++++++++++++++-------------
 include/linux/node.h        |    4 ++++
 12 files changed, 22 insertions(+), 80 deletions(-)

Patch

--- a/arch/arm64/kernel/setup.c~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/arch/arm64/kernel/setup.c
@@ -406,9 +406,6 @@  static int __init topology_init(void)
 {
 	int i;
 
-	for_each_online_node(i)
-		register_one_node(i);
-
 	for_each_possible_cpu(i) {
 		struct cpu *cpu = &per_cpu(cpu_data.cpu, i);
 		cpu->hotpluggable = cpu_can_disable(i);
--- a/arch/ia64/kernel/topology.c~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/arch/ia64/kernel/topology.c
@@ -70,16 +70,6 @@  static int __init topology_init(void)
 {
 	int i, err = 0;
 
-#ifdef CONFIG_NUMA
-	/*
-	 * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
-	 */
-	for_each_online_node(i) {
-		if ((err = register_one_node(i)))
-			goto out;
-	}
-#endif
-
 	sysfs_cpus = kcalloc(NR_CPUS, sizeof(struct ia64_cpu), GFP_KERNEL);
 	if (!sysfs_cpus)
 		panic("kzalloc in topology_init failed - NR_CPUS too big?");
--- a/arch/mips/kernel/topology.c~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/arch/mips/kernel/topology.c
@@ -12,11 +12,6 @@  static int __init topology_init(void)
 {
 	int i, ret;
 
-#ifdef CONFIG_NUMA
-	for_each_online_node(i)
-		register_one_node(i);
-#endif /* CONFIG_NUMA */
-
 	for_each_present_cpu(i) {
 		struct cpu *c = &per_cpu(cpu_devices, i);
 
--- a/arch/powerpc/kernel/sysfs.c~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/arch/powerpc/kernel/sysfs.c
@@ -1110,14 +1110,6 @@  EXPORT_SYMBOL_GPL(cpu_remove_dev_attr_gr
 /* NUMA stuff */
 
 #ifdef CONFIG_NUMA
-static void __init register_nodes(void)
-{
-	int i;
-
-	for (i = 0; i < MAX_NUMNODES; i++)
-		register_one_node(i);
-}
-
 int sysfs_add_device_to_node(struct device *dev, int nid)
 {
 	struct node *node = node_devices[nid];
@@ -1132,13 +1124,6 @@  void sysfs_remove_device_from_node(struc
 	sysfs_remove_link(&node->dev.kobj, kobject_name(&dev->kobj));
 }
 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
-
-#else
-static void __init register_nodes(void)
-{
-	return;
-}
-
 #endif
 
 /* Only valid if CPU is present. */
@@ -1155,8 +1140,6 @@  static int __init topology_init(void)
 {
 	int cpu, r;
 
-	register_nodes();
-
 	for_each_possible_cpu(cpu) {
 		struct cpu *c = &per_cpu(cpu_devices, cpu);
 
--- a/arch/riscv/kernel/setup.c~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/arch/riscv/kernel/setup.c
@@ -301,9 +301,6 @@  static int __init topology_init(void)
 {
 	int i, ret;
 
-	for_each_online_node(i)
-		register_one_node(i);
-
 	for_each_possible_cpu(i) {
 		struct cpu *cpu = &per_cpu(cpu_devices, i);
 
--- a/arch/s390/kernel/numa.c~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/arch/s390/kernel/numa.c
@@ -33,10 +33,3 @@  void __init numa_setup(void)
 	NODE_DATA(0)->node_spanned_pages = memblock_end_of_DRAM() >> PAGE_SHIFT;
 	NODE_DATA(0)->node_id = 0;
 }
-
-static int __init numa_init_late(void)
-{
-	register_one_node(0);
-	return 0;
-}
-arch_initcall(numa_init_late);
--- a/arch/sh/kernel/topology.c~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/arch/sh/kernel/topology.c
@@ -46,11 +46,6 @@  static int __init topology_init(void)
 {
 	int i, ret;
 
-#ifdef CONFIG_NUMA
-	for_each_online_node(i)
-		register_one_node(i);
-#endif
-
 	for_each_present_cpu(i) {
 		struct cpu *c = &per_cpu(cpu_devices, i);
 
--- a/arch/sparc/kernel/sysfs.c~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/arch/sparc/kernel/sysfs.c
@@ -244,22 +244,10 @@  static void __init check_mmu_stats(void)
 		mmu_stats_supported = 1;
 }
 
-static void register_nodes(void)
-{
-#ifdef CONFIG_NUMA
-	int i;
-
-	for (i = 0; i < MAX_NUMNODES; i++)
-		register_one_node(i);
-#endif
-}
-
 static int __init topology_init(void)
 {
 	int cpu, ret;
 
-	register_nodes();
-
 	check_mmu_stats();
 
 	for_each_possible_cpu(cpu) {
--- a/arch/x86/kernel/topology.c~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/arch/x86/kernel/topology.c
@@ -154,11 +154,6 @@  static int __init topology_init(void)
 {
 	int i;
 
-#ifdef CONFIG_NUMA
-	for_each_online_node(i)
-		register_one_node(i);
-#endif
-
 	for_each_present_cpu(i)
 		arch_register_cpu(i);
 
--- a/drivers/base/init.c~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/drivers/base/init.c
@@ -35,5 +35,6 @@  void __init driver_init(void)
 	auxiliary_bus_init();
 	cpu_dev_init();
 	memory_dev_init();
+	node_dev_init();
 	container_dev_init();
 }
--- a/drivers/base/node.c~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/drivers/base/node.c
@@ -1065,26 +1065,30 @@  static const struct attribute_group *cpu
 };
 
 #define NODE_CALLBACK_PRI	2	/* lower than SLAB */
-static int __init register_node_type(void)
+void __init node_dev_init(void)
 {
-	int ret;
+	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);
  	BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
 
 	ret = subsys_system_register(&node_subsys, cpu_root_attr_groups);
-	if (!ret) {
-		static struct notifier_block node_memory_callback_nb = {
-			.notifier_call = node_memory_callback,
-			.priority = NODE_CALLBACK_PRI,
-		};
-		register_hotmemory_notifier(&node_memory_callback_nb);
-	}
+	if (ret)
+		panic("%s() failed to register subsystem: %d\n", __func__, ret);
+
+	register_hotmemory_notifier(&node_memory_callback_nb);
 
 	/*
-	 * Note:  we're not going to unregister the node class if we fail
-	 * to register the node state class attribute files.
+	 * Create all node devices, which will properly link the node
+	 * to applicable memory block devices and already created cpu devices.
 	 */
-	return ret;
+	for_each_online_node(i) {
+		ret = register_one_node(i);
+		if (ret)
+			panic("%s() failed to add node: %d\n", __func__, ret);
+	}
 }
-postcore_initcall(register_node_type);
--- a/include/linux/node.h~drivers-base-node-consolidate-node-device-subsystem-initialization-in-node_dev_init
+++ a/include/linux/node.h
@@ -112,6 +112,7 @@  static inline void link_mem_sections(int
 
 extern void unregister_node(struct node *node);
 #ifdef CONFIG_NUMA
+extern void node_dev_init(void);
 /* Core of the node registration - only memory hotplug should use this */
 extern int __register_one_node(int nid);
 
@@ -149,6 +150,9 @@  extern void register_hugetlbfs_with_node
 					 node_registration_func_t unregister);
 #endif
 #else
+static inline void node_dev_init(void)
+{
+}
 static inline int __register_one_node(int nid)
 {
 	return 0;