1/* 2 * Basic Node interface support 3 */ 4 5#include <linux/module.h> 6#include <linux/init.h> 7#include <linux/mm.h> 8#include <linux/memory.h> 9#include <linux/vmstat.h> 10#include <linux/notifier.h> 11#include <linux/node.h> 12#include <linux/hugetlb.h> 13#include <linux/compaction.h> 14#include <linux/cpumask.h> 15#include <linux/topology.h> 16#include <linux/nodemask.h> 17#include <linux/cpu.h> 18#include <linux/device.h> 19#include <linux/swap.h> 20#include <linux/slab.h> 21 22static struct bus_type node_subsys = { 23 .name = "node", 24 .dev_name = "node", 25}; 26 27 28static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf) 29{ 30 struct node *node_dev = to_node(dev); 31 const struct cpumask *mask = cpumask_of_node(node_dev->dev.id); 32 33 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ 34 BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); 35 36 return cpumap_print_to_pagebuf(list, buf, mask); 37} 38 39static inline ssize_t node_read_cpumask(struct device *dev, 40 struct device_attribute *attr, char *buf) 41{ 42 return node_read_cpumap(dev, false, buf); 43} 44static inline ssize_t node_read_cpulist(struct device *dev, 45 struct device_attribute *attr, char *buf) 46{ 47 return node_read_cpumap(dev, true, buf); 48} 49 50static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); 51static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); 52 53#define K(x) ((x) << (PAGE_SHIFT - 10)) 54static ssize_t node_read_meminfo(struct device *dev, 55 struct device_attribute *attr, char *buf) 56{ 57 int n; 58 int nid = dev->id; 59 struct sysinfo i; 60 61 si_meminfo_node(&i, nid); 62 n = sprintf(buf, 63 "Node %d MemTotal: %8lu kB\n" 64 "Node %d MemFree: %8lu kB\n" 65 "Node %d MemUsed: %8lu kB\n" 66 "Node %d Active: %8lu kB\n" 67 "Node %d Inactive: %8lu kB\n" 68 "Node %d Active(anon): %8lu kB\n" 69 "Node %d Inactive(anon): %8lu kB\n" 70 "Node %d Active(file): %8lu kB\n" 71 "Node %d Inactive(file): %8lu kB\n" 72 "Node %d Unevictable: %8lu kB\n" 73 "Node %d Mlocked: %8lu kB\n", 74 nid, K(i.totalram), 75 nid, K(i.freeram), 76 nid, K(i.totalram - i.freeram), 77 nid, K(node_page_state(nid, NR_ACTIVE_ANON) + 78 node_page_state(nid, NR_ACTIVE_FILE)), 79 nid, K(node_page_state(nid, NR_INACTIVE_ANON) + 80 node_page_state(nid, NR_INACTIVE_FILE)), 81 nid, K(node_page_state(nid, NR_ACTIVE_ANON)), 82 nid, K(node_page_state(nid, NR_INACTIVE_ANON)), 83 nid, K(node_page_state(nid, NR_ACTIVE_FILE)), 84 nid, K(node_page_state(nid, NR_INACTIVE_FILE)), 85 nid, K(node_page_state(nid, NR_UNEVICTABLE)), 86 nid, K(node_page_state(nid, NR_MLOCK))); 87 88#ifdef CONFIG_HIGHMEM 89 n += sprintf(buf + n, 90 "Node %d HighTotal: %8lu kB\n" 91 "Node %d HighFree: %8lu kB\n" 92 "Node %d LowTotal: %8lu kB\n" 93 "Node %d LowFree: %8lu kB\n", 94 nid, K(i.totalhigh), 95 nid, K(i.freehigh), 96 nid, K(i.totalram - i.totalhigh), 97 nid, K(i.freeram - i.freehigh)); 98#endif 99 n += sprintf(buf + n, 100 "Node %d Dirty: %8lu kB\n" 101 "Node %d Writeback: %8lu kB\n" 102 "Node %d FilePages: %8lu kB\n" 103 "Node %d Mapped: %8lu kB\n" 104 "Node %d AnonPages: %8lu kB\n" 105 "Node %d Shmem: %8lu kB\n" 106 "Node %d KernelStack: %8lu kB\n" 107 "Node %d PageTables: %8lu kB\n" 108 "Node %d NFS_Unstable: %8lu kB\n" 109 "Node %d Bounce: %8lu kB\n" 110 "Node %d WritebackTmp: %8lu kB\n" 111 "Node %d Slab: %8lu kB\n" 112 "Node %d SReclaimable: %8lu kB\n" 113 "Node %d SUnreclaim: %8lu kB\n" 114#ifdef CONFIG_TRANSPARENT_HUGEPAGE 115 "Node %d AnonHugePages: %8lu kB\n" 116#endif 117 , 118 nid, K(node_page_state(nid, NR_FILE_DIRTY)), 119 nid, K(node_page_state(nid, NR_WRITEBACK)), 120 nid, K(node_page_state(nid, NR_FILE_PAGES)), 121 nid, K(node_page_state(nid, NR_FILE_MAPPED)), 122 nid, K(node_page_state(nid, NR_ANON_PAGES)), 123 nid, K(i.sharedram), 124 nid, node_page_state(nid, NR_KERNEL_STACK) * 125 THREAD_SIZE / 1024, 126 nid, K(node_page_state(nid, NR_PAGETABLE)), 127 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), 128 nid, K(node_page_state(nid, NR_BOUNCE)), 129 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), 130 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + 131 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), 132 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), 133#ifdef CONFIG_TRANSPARENT_HUGEPAGE 134 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)) 135 , nid, 136 K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) * 137 HPAGE_PMD_NR)); 138#else 139 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); 140#endif 141 n += hugetlb_report_node_meminfo(nid, buf + n); 142 return n; 143} 144 145#undef K 146static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); 147 148static ssize_t node_read_numastat(struct device *dev, 149 struct device_attribute *attr, char *buf) 150{ 151 return sprintf(buf, 152 "numa_hit %lu\n" 153 "numa_miss %lu\n" 154 "numa_foreign %lu\n" 155 "interleave_hit %lu\n" 156 "local_node %lu\n" 157 "other_node %lu\n", 158 node_page_state(dev->id, NUMA_HIT), 159 node_page_state(dev->id, NUMA_MISS), 160 node_page_state(dev->id, NUMA_FOREIGN), 161 node_page_state(dev->id, NUMA_INTERLEAVE_HIT), 162 node_page_state(dev->id, NUMA_LOCAL), 163 node_page_state(dev->id, NUMA_OTHER)); 164} 165static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); 166 167static ssize_t node_read_vmstat(struct device *dev, 168 struct device_attribute *attr, char *buf) 169{ 170 int nid = dev->id; 171 int i; 172 int n = 0; 173 174 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) 175 n += sprintf(buf+n, "%s %lu\n", vmstat_text[i], 176 node_page_state(nid, i)); 177 178 return n; 179} 180static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL); 181 182static ssize_t node_read_distance(struct device *dev, 183 struct device_attribute *attr, char *buf) 184{ 185 int nid = dev->id; 186 int len = 0; 187 int i; 188 189 /* 190 * buf is currently PAGE_SIZE in length and each node needs 4 chars 191 * at the most (distance + space or newline). 192 */ 193 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); 194 195 for_each_online_node(i) 196 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); 197 198 len += sprintf(buf + len, "\n"); 199 return len; 200} 201static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL); 202 203static struct attribute *node_dev_attrs[] = { 204 &dev_attr_cpumap.attr, 205 &dev_attr_cpulist.attr, 206 &dev_attr_meminfo.attr, 207 &dev_attr_numastat.attr, 208 &dev_attr_distance.attr, 209 &dev_attr_vmstat.attr, 210 NULL 211}; 212ATTRIBUTE_GROUPS(node_dev); 213 214#ifdef CONFIG_HUGETLBFS 215/* 216 * hugetlbfs per node attributes registration interface: 217 * When/if hugetlb[fs] subsystem initializes [sometime after this module], 218 * it will register its per node attributes for all online nodes with 219 * memory. It will also call register_hugetlbfs_with_node(), below, to 220 * register its attribute registration functions with this node driver. 221 * Once these hooks have been initialized, the node driver will call into 222 * the hugetlb module to [un]register attributes for hot-plugged nodes. 223 */ 224static node_registration_func_t __hugetlb_register_node; 225static node_registration_func_t __hugetlb_unregister_node; 226 227static inline bool hugetlb_register_node(struct node *node) 228{ 229 if (__hugetlb_register_node && 230 node_state(node->dev.id, N_MEMORY)) { 231 __hugetlb_register_node(node); 232 return true; 233 } 234 return false; 235} 236 237static inline void hugetlb_unregister_node(struct node *node) 238{ 239 if (__hugetlb_unregister_node) 240 __hugetlb_unregister_node(node); 241} 242 243void register_hugetlbfs_with_node(node_registration_func_t doregister, 244 node_registration_func_t unregister) 245{ 246 __hugetlb_register_node = doregister; 247 __hugetlb_unregister_node = unregister; 248} 249#else 250static inline void hugetlb_register_node(struct node *node) {} 251 252static inline void hugetlb_unregister_node(struct node *node) {} 253#endif 254 255static void node_device_release(struct device *dev) 256{ 257 struct node *node = to_node(dev); 258 259#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS) 260 /* 261 * We schedule the work only when a memory section is 262 * onlined/offlined on this node. When we come here, 263 * all the memory on this node has been offlined, 264 * so we won't enqueue new work to this work. 265 * 266 * The work is using node->node_work, so we should 267 * flush work before freeing the memory. 268 */ 269 flush_work(&node->node_work); 270#endif 271 kfree(node); 272} 273 274/* 275 * register_node - Setup a sysfs device for a node. 276 * @num - Node number to use when creating the device. 277 * 278 * Initialize and register the node device. 279 */ 280static int register_node(struct node *node, int num, struct node *parent) 281{ 282 int error; 283 284 node->dev.id = num; 285 node->dev.bus = &node_subsys; 286 node->dev.release = node_device_release; 287 node->dev.groups = node_dev_groups; 288 error = device_register(&node->dev); 289 290 if (!error){ 291 hugetlb_register_node(node); 292 293 compaction_register_node(node); 294 } 295 return error; 296} 297 298/** 299 * unregister_node - unregister a node device 300 * @node: node going away 301 * 302 * Unregisters a node device @node. All the devices on the node must be 303 * unregistered before calling this function. 304 */ 305void unregister_node(struct node *node) 306{ 307 hugetlb_unregister_node(node); /* no-op, if memoryless node */ 308 309 device_unregister(&node->dev); 310} 311 312struct node *node_devices[MAX_NUMNODES]; 313 314/* 315 * register cpu under node 316 */ 317int register_cpu_under_node(unsigned int cpu, unsigned int nid) 318{ 319 int ret; 320 struct device *obj; 321 322 if (!node_online(nid)) 323 return 0; 324 325 obj = get_cpu_device(cpu); 326 if (!obj) 327 return 0; 328 329 ret = sysfs_create_link(&node_devices[nid]->dev.kobj, 330 &obj->kobj, 331 kobject_name(&obj->kobj)); 332 if (ret) 333 return ret; 334 335 return sysfs_create_link(&obj->kobj, 336 &node_devices[nid]->dev.kobj, 337 kobject_name(&node_devices[nid]->dev.kobj)); 338} 339 340int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 341{ 342 struct device *obj; 343 344 if (!node_online(nid)) 345 return 0; 346 347 obj = get_cpu_device(cpu); 348 if (!obj) 349 return 0; 350 351 sysfs_remove_link(&node_devices[nid]->dev.kobj, 352 kobject_name(&obj->kobj)); 353 sysfs_remove_link(&obj->kobj, 354 kobject_name(&node_devices[nid]->dev.kobj)); 355 356 return 0; 357} 358 359#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 360#define page_initialized(page) (page->lru.next) 361 362static int get_nid_for_pfn(unsigned long pfn) 363{ 364 struct page *page; 365 366 if (!pfn_valid_within(pfn)) 367 return -1; 368 page = pfn_to_page(pfn); 369 if (!page_initialized(page)) 370 return -1; 371 return pfn_to_nid(pfn); 372} 373 374/* register memory section under specified node if it spans that node */ 375int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) 376{ 377 int ret; 378 unsigned long pfn, sect_start_pfn, sect_end_pfn; 379 380 if (!mem_blk) 381 return -EFAULT; 382 if (!node_online(nid)) 383 return 0; 384 385 sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); 386 sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr); 387 sect_end_pfn += PAGES_PER_SECTION - 1; 388 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { 389 int page_nid; 390 391 /* 392 * memory block could have several absent sections from start. 393 * skip pfn range from absent section 394 */ 395 if (!pfn_present(pfn)) { 396 pfn = round_down(pfn + PAGES_PER_SECTION, 397 PAGES_PER_SECTION) - 1; 398 continue; 399 } 400 401 page_nid = get_nid_for_pfn(pfn); 402 if (page_nid < 0) 403 continue; 404 if (page_nid != nid) 405 continue; 406 ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, 407 &mem_blk->dev.kobj, 408 kobject_name(&mem_blk->dev.kobj)); 409 if (ret) 410 return ret; 411 412 return sysfs_create_link_nowarn(&mem_blk->dev.kobj, 413 &node_devices[nid]->dev.kobj, 414 kobject_name(&node_devices[nid]->dev.kobj)); 415 } 416 /* mem section does not span the specified node */ 417 return 0; 418} 419 420/* unregister memory section under all nodes that it spans */ 421int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, 422 unsigned long phys_index) 423{ 424 NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); 425 unsigned long pfn, sect_start_pfn, sect_end_pfn; 426 427 if (!mem_blk) { 428 NODEMASK_FREE(unlinked_nodes); 429 return -EFAULT; 430 } 431 if (!unlinked_nodes) 432 return -ENOMEM; 433 nodes_clear(*unlinked_nodes); 434 435 sect_start_pfn = section_nr_to_pfn(phys_index); 436 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; 437 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { 438 int nid; 439 440 nid = get_nid_for_pfn(pfn); 441 if (nid < 0) 442 continue; 443 if (!node_online(nid)) 444 continue; 445 if (node_test_and_set(nid, *unlinked_nodes)) 446 continue; 447 sysfs_remove_link(&node_devices[nid]->dev.kobj, 448 kobject_name(&mem_blk->dev.kobj)); 449 sysfs_remove_link(&mem_blk->dev.kobj, 450 kobject_name(&node_devices[nid]->dev.kobj)); 451 } 452 NODEMASK_FREE(unlinked_nodes); 453 return 0; 454} 455 456static int link_mem_sections(int nid) 457{ 458 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; 459 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; 460 unsigned long pfn; 461 struct memory_block *mem_blk = NULL; 462 int err = 0; 463 464 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { 465 unsigned long section_nr = pfn_to_section_nr(pfn); 466 struct mem_section *mem_sect; 467 int ret; 468 469 if (!present_section_nr(section_nr)) 470 continue; 471 mem_sect = __nr_to_section(section_nr); 472 473 /* same memblock ? */ 474 if (mem_blk) 475 if ((section_nr >= mem_blk->start_section_nr) && 476 (section_nr <= mem_blk->end_section_nr)) 477 continue; 478 479 mem_blk = find_memory_block_hinted(mem_sect, mem_blk); 480 481 ret = register_mem_sect_under_node(mem_blk, nid); 482 if (!err) 483 err = ret; 484 485 /* discard ref obtained in find_memory_block() */ 486 } 487 488 if (mem_blk) 489 kobject_put(&mem_blk->dev.kobj); 490 return err; 491} 492 493#ifdef CONFIG_HUGETLBFS 494/* 495 * Handle per node hstate attribute [un]registration on transistions 496 * to/from memoryless state. 497 */ 498static void node_hugetlb_work(struct work_struct *work) 499{ 500 struct node *node = container_of(work, struct node, node_work); 501 502 /* 503 * We only get here when a node transitions to/from memoryless state. 504 * We can detect which transition occurred by examining whether the 505 * node has memory now. hugetlb_register_node() already check this 506 * so we try to register the attributes. If that fails, then the 507 * node has transitioned to memoryless, try to unregister the 508 * attributes. 509 */ 510 if (!hugetlb_register_node(node)) 511 hugetlb_unregister_node(node); 512} 513 514static void init_node_hugetlb_work(int nid) 515{ 516 INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work); 517} 518 519static int node_memory_callback(struct notifier_block *self, 520 unsigned long action, void *arg) 521{ 522 struct memory_notify *mnb = arg; 523 int nid = mnb->status_change_nid; 524 525 switch (action) { 526 case MEM_ONLINE: 527 case MEM_OFFLINE: 528 /* 529 * offload per node hstate [un]registration to a work thread 530 * when transitioning to/from memoryless state. 531 */ 532 if (nid != NUMA_NO_NODE) 533 schedule_work(&node_devices[nid]->node_work); 534 break; 535 536 case MEM_GOING_ONLINE: 537 case MEM_GOING_OFFLINE: 538 case MEM_CANCEL_ONLINE: 539 case MEM_CANCEL_OFFLINE: 540 default: 541 break; 542 } 543 544 return NOTIFY_OK; 545} 546#endif /* CONFIG_HUGETLBFS */ 547#else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ 548 549static int link_mem_sections(int nid) { return 0; } 550#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 551 552#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ 553 !defined(CONFIG_HUGETLBFS) 554static inline int node_memory_callback(struct notifier_block *self, 555 unsigned long action, void *arg) 556{ 557 return NOTIFY_OK; 558} 559 560static void init_node_hugetlb_work(int nid) { } 561 562#endif 563 564int register_one_node(int nid) 565{ 566 int error = 0; 567 int cpu; 568 569 if (node_online(nid)) { 570 int p_node = parent_node(nid); 571 struct node *parent = NULL; 572 573 if (p_node != nid) 574 parent = node_devices[p_node]; 575 576 node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL); 577 if (!node_devices[nid]) 578 return -ENOMEM; 579 580 error = register_node(node_devices[nid], nid, parent); 581 582 /* link cpu under this node */ 583 for_each_present_cpu(cpu) { 584 if (cpu_to_node(cpu) == nid) 585 register_cpu_under_node(cpu, nid); 586 } 587 588 /* link memory sections under this node */ 589 error = link_mem_sections(nid); 590 591 /* initialize work queue for memory hot plug */ 592 init_node_hugetlb_work(nid); 593 } 594 595 return error; 596 597} 598 599void unregister_one_node(int nid) 600{ 601 if (!node_devices[nid]) 602 return; 603 604 unregister_node(node_devices[nid]); 605 node_devices[nid] = NULL; 606} 607 608/* 609 * node states attributes 610 */ 611 612static ssize_t print_nodes_state(enum node_states state, char *buf) 613{ 614 int n; 615 616 n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", 617 nodemask_pr_args(&node_states[state])); 618 buf[n++] = '\n'; 619 buf[n] = '\0'; 620 return n; 621} 622 623struct node_attr { 624 struct device_attribute attr; 625 enum node_states state; 626}; 627 628static ssize_t show_node_state(struct device *dev, 629 struct device_attribute *attr, char *buf) 630{ 631 struct node_attr *na = container_of(attr, struct node_attr, attr); 632 return print_nodes_state(na->state, buf); 633} 634 635#define _NODE_ATTR(name, state) \ 636 { __ATTR(name, 0444, show_node_state, NULL), state } 637 638static struct node_attr node_state_attr[] = { 639 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE), 640 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE), 641 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), 642#ifdef CONFIG_HIGHMEM 643 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), 644#endif 645#ifdef CONFIG_MOVABLE_NODE 646 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY), 647#endif 648 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU), 649}; 650 651static struct attribute *node_state_attrs[] = { 652 &node_state_attr[N_POSSIBLE].attr.attr, 653 &node_state_attr[N_ONLINE].attr.attr, 654 &node_state_attr[N_NORMAL_MEMORY].attr.attr, 655#ifdef CONFIG_HIGHMEM 656 &node_state_attr[N_HIGH_MEMORY].attr.attr, 657#endif 658#ifdef CONFIG_MOVABLE_NODE 659 &node_state_attr[N_MEMORY].attr.attr, 660#endif 661 &node_state_attr[N_CPU].attr.attr, 662 NULL 663}; 664 665static struct attribute_group memory_root_attr_group = { 666 .attrs = node_state_attrs, 667}; 668 669static const struct attribute_group *cpu_root_attr_groups[] = { 670 &memory_root_attr_group, 671 NULL, 672}; 673 674#define NODE_CALLBACK_PRI 2 /* lower than SLAB */ 675static int __init register_node_type(void) 676{ 677 int ret; 678 679 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); 680 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); 681 682 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); 683 if (!ret) { 684 static struct notifier_block node_memory_callback_nb = { 685 .notifier_call = node_memory_callback, 686 .priority = NODE_CALLBACK_PRI, 687 }; 688 register_hotmemory_notifier(&node_memory_callback_nb); 689 } 690 691 /* 692 * Note: we're not going to unregister the node class if we fail 693 * to register the node state class attribute files. 694 */ 695 return ret; 696} 697postcore_initcall(register_node_type); 698