[linux.git] / drivers / base / node.c

/*
 * drivers/base/node.c - basic Node class support
 */

#include <linux/sysdev.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/memory.h>
#include <linux/node.h>
#include <linux/hugetlb.h>
#include <linux/compaction.h>
#include <linux/cpumask.h>
#include <linux/topology.h>
#include <linux/nodemask.h>
#include <linux/cpu.h>
#include <linux/device.h>
#include <linux/swap.h>
#include <linux/slab.h>

static struct sysdev_class_attribute *node_state_attrs[];

static struct sysdev_class node_class = {
	.name = "node",
	.attrs = node_state_attrs,
};


static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
{
	struct node *node_dev = to_node(dev);
	const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id);
	int len;

	/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
	BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));

	len = type?
		cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
		cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
 	buf[len++] = '\n';
 	buf[len] = '\0';
	return len;
}

static inline ssize_t node_read_cpumask(struct sys_device *dev,
				struct sysdev_attribute *attr, char *buf)
{
	return node_read_cpumap(dev, 0, buf);
}
static inline ssize_t node_read_cpulist(struct sys_device *dev,
				struct sysdev_attribute *attr, char *buf)
{
	return node_read_cpumap(dev, 1, buf);
}

static SYSDEV_ATTR(cpumap,  S_IRUGO, node_read_cpumask, NULL);
static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);

#define K(x) ((x) << (PAGE_SHIFT - 10))
static ssize_t node_read_meminfo(struct sys_device * dev,
			struct sysdev_attribute *attr, char * buf)
{
	int n;
	int nid = dev->id;
	struct sysinfo i;

	si_meminfo_node(&i, nid);
	n = sprintf(buf,
		       "Node %d MemTotal:       %8lu kB\n"
		       "Node %d MemFree:        %8lu kB\n"
		       "Node %d MemUsed:        %8lu kB\n"
		       "Node %d Active:         %8lu kB\n"
		       "Node %d Inactive:       %8lu kB\n"
		       "Node %d Active(anon):   %8lu kB\n"
		       "Node %d Inactive(anon): %8lu kB\n"
		       "Node %d Active(file):   %8lu kB\n"
		       "Node %d Inactive(file): %8lu kB\n"
		       "Node %d Unevictable:    %8lu kB\n"
		       "Node %d Mlocked:        %8lu kB\n",
		       nid, K(i.totalram),
		       nid, K(i.freeram),
		       nid, K(i.totalram - i.freeram),
		       nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
				node_page_state(nid, NR_ACTIVE_FILE)),
		       nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
				node_page_state(nid, NR_INACTIVE_FILE)),
		       nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
		       nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
		       nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
		       nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
		       nid, K(node_page_state(nid, NR_UNEVICTABLE)),
		       nid, K(node_page_state(nid, NR_MLOCK)));

#ifdef CONFIG_HIGHMEM
	n += sprintf(buf + n,
		       "Node %d HighTotal:      %8lu kB\n"
		       "Node %d HighFree:       %8lu kB\n"
		       "Node %d LowTotal:       %8lu kB\n"
		       "Node %d LowFree:        %8lu kB\n",
		       nid, K(i.totalhigh),
		       nid, K(i.freehigh),
		       nid, K(i.totalram - i.totalhigh),
		       nid, K(i.freeram - i.freehigh));
#endif
	n += sprintf(buf + n,
		       "Node %d Dirty:          %8lu kB\n"
		       "Node %d Writeback:      %8lu kB\n"
		       "Node %d FilePages:      %8lu kB\n"
		       "Node %d Mapped:         %8lu kB\n"
		       "Node %d AnonPages:      %8lu kB\n"
		       "Node %d Shmem:          %8lu kB\n"
		       "Node %d KernelStack:    %8lu kB\n"
		       "Node %d PageTables:     %8lu kB\n"
		       "Node %d NFS_Unstable:   %8lu kB\n"
		       "Node %d Bounce:         %8lu kB\n"
		       "Node %d WritebackTmp:   %8lu kB\n"
		       "Node %d Slab:           %8lu kB\n"
		       "Node %d SReclaimable:   %8lu kB\n"
		       "Node %d SUnreclaim:     %8lu kB\n"
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
		       "Node %d AnonHugePages:  %8lu kB\n"
#endif
			,
		       nid, K(node_page_state(nid, NR_FILE_DIRTY)),
		       nid, K(node_page_state(nid, NR_WRITEBACK)),
		       nid, K(node_page_state(nid, NR_FILE_PAGES)),
		       nid, K(node_page_state(nid, NR_FILE_MAPPED)),
		       nid, K(node_page_state(nid, NR_ANON_PAGES)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
			+ node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
			HPAGE_PMD_NR
#endif
		       ),
		       nid, K(node_page_state(nid, NR_SHMEM)),
		       nid, node_page_state(nid, NR_KERNEL_STACK) *
				THREAD_SIZE / 1024,
		       nid, K(node_page_state(nid, NR_PAGETABLE)),
		       nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
		       nid, K(node_page_state(nid, NR_BOUNCE)),
		       nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
		       nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
				node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
		       nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
		       nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
			, nid,
			K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
			HPAGE_PMD_NR)
#endif
		       );
	n += hugetlb_report_node_meminfo(nid, buf + n);
	return n;
}

#undef K
static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);

static ssize_t node_read_numastat(struct sys_device * dev,
				struct sysdev_attribute *attr, char * buf)
{
	return sprintf(buf,
		       "numa_hit %lu\n"
		       "numa_miss %lu\n"
		       "numa_foreign %lu\n"
		       "interleave_hit %lu\n"
		       "local_node %lu\n"
		       "other_node %lu\n",
		       node_page_state(dev->id, NUMA_HIT),
		       node_page_state(dev->id, NUMA_MISS),
		       node_page_state(dev->id, NUMA_FOREIGN),
		       node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
		       node_page_state(dev->id, NUMA_LOCAL),
		       node_page_state(dev->id, NUMA_OTHER));
}
static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);

static ssize_t node_read_vmstat(struct sys_device *dev,
				struct sysdev_attribute *attr, char *buf)
{
	int nid = dev->id;
	return sprintf(buf,
		"nr_written %lu\n"
		"nr_dirtied %lu\n",
		node_page_state(nid, NR_WRITTEN),
		node_page_state(nid, NR_DIRTIED));
}
static SYSDEV_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL);

static ssize_t node_read_distance(struct sys_device * dev,
			struct sysdev_attribute *attr, char * buf)
{
	int nid = dev->id;
	int len = 0;
	int i;

	/*
	 * buf is currently PAGE_SIZE in length and each node needs 4 chars
	 * at the most (distance + space or newline).
	 */
	BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);

	for_each_online_node(i)
		len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));

	len += sprintf(buf + len, "\n");
	return len;
}
static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, 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->sysdev.id, N_HIGH_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


/*
 * register_node - Setup a sysfs device for a node.
 * @num - Node number to use when creating the device.
 *
 * Initialize and register the node device.
 */
int register_node(struct node *node, int num, struct node *parent)
{
	int error;

	node->sysdev.id = num;
	node->sysdev.cls = &node_class;
	error = sysdev_register(&node->sysdev);

	if (!error){
		sysdev_create_file(&node->sysdev, &attr_cpumap);
		sysdev_create_file(&node->sysdev, &attr_cpulist);
		sysdev_create_file(&node->sysdev, &attr_meminfo);
		sysdev_create_file(&node->sysdev, &attr_numastat);
		sysdev_create_file(&node->sysdev, &attr_distance);
		sysdev_create_file(&node->sysdev, &attr_vmstat);

		scan_unevictable_register_node(node);

		hugetlb_register_node(node);

		compaction_register_node(node);
	}
	return error;
}

/**
 * unregister_node - unregister a node device
 * @node: node going away
 *
 * Unregisters a node device @node.  All the devices on the node must be
 * unregistered before calling this function.
 */
void unregister_node(struct node *node)
{
	sysdev_remove_file(&node->sysdev, &attr_cpumap);
	sysdev_remove_file(&node->sysdev, &attr_cpulist);
	sysdev_remove_file(&node->sysdev, &attr_meminfo);
	sysdev_remove_file(&node->sysdev, &attr_numastat);
	sysdev_remove_file(&node->sysdev, &attr_distance);
	sysdev_remove_file(&node->sysdev, &attr_vmstat);

	scan_unevictable_unregister_node(node);
	hugetlb_unregister_node(node);		/* no-op, if memoryless node */

	sysdev_unregister(&node->sysdev);
}

struct node node_devices[MAX_NUMNODES];

/*
 * register cpu under node
 */
int register_cpu_under_node(unsigned int cpu, unsigned int nid)
{
	int ret;
	struct sys_device *obj;

	if (!node_online(nid))
		return 0;

	obj = get_cpu_sysdev(cpu);
	if (!obj)
		return 0;

	ret = sysfs_create_link(&node_devices[nid].sysdev.kobj,
				&obj->kobj,
				kobject_name(&obj->kobj));
	if (ret)
		return ret;

	return sysfs_create_link(&obj->kobj,
				 &node_devices[nid].sysdev.kobj,
				 kobject_name(&node_devices[nid].sysdev.kobj));
}

int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
{
	struct sys_device *obj;

	if (!node_online(nid))
		return 0;

	obj = get_cpu_sysdev(cpu);
	if (!obj)
		return 0;

	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
			  kobject_name(&obj->kobj));
	sysfs_remove_link(&obj->kobj,
			  kobject_name(&node_devices[nid].sysdev.kobj));

	return 0;
}

#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
#define page_initialized(page)  (page->lru.next)

static int get_nid_for_pfn(unsigned long pfn)
{
	struct page *page;

	if (!pfn_valid_within(pfn))
		return -1;
	page = pfn_to_page(pfn);
	if (!page_initialized(page))
		return -1;
	return pfn_to_nid(pfn);
}

/* register memory section under specified node if it spans that node */
int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
{
	int ret;
	unsigned long pfn, sect_start_pfn, sect_end_pfn;

	if (!mem_blk)
		return -EFAULT;
	if (!node_online(nid))
		return 0;
	sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
		int page_nid;

		page_nid = get_nid_for_pfn(pfn);
		if (page_nid < 0)
			continue;
		if (page_nid != nid)
			continue;
		ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
					&mem_blk->sysdev.kobj,
					kobject_name(&mem_blk->sysdev.kobj));
		if (ret)
			return ret;

		return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj,
				&node_devices[nid].sysdev.kobj,
				kobject_name(&node_devices[nid].sysdev.kobj));
	}
	/* mem section does not span the specified node */
	return 0;
}

/* unregister memory section under all nodes that it spans */
int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
{
	NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
	unsigned long pfn, sect_start_pfn, sect_end_pfn;

	if (!mem_blk) {
		NODEMASK_FREE(unlinked_nodes);
		return -EFAULT;
	}
	if (!unlinked_nodes)
		return -ENOMEM;
	nodes_clear(*unlinked_nodes);
	sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
		int nid;

		nid = get_nid_for_pfn(pfn);
		if (nid < 0)
			continue;
		if (!node_online(nid))
			continue;
		if (node_test_and_set(nid, *unlinked_nodes))
			continue;
		sysfs_remove_link(&node_devices[nid].sysdev.kobj,
			 kobject_name(&mem_blk->sysdev.kobj));
		sysfs_remove_link(&mem_blk->sysdev.kobj,
			 kobject_name(&node_devices[nid].sysdev.kobj));
	}
	NODEMASK_FREE(unlinked_nodes);
	return 0;
}

static int link_mem_sections(int nid)
{
	unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
	unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
	unsigned long pfn;
	struct memory_block *mem_blk = NULL;
	int err = 0;

	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
		unsigned long section_nr = pfn_to_section_nr(pfn);
		struct mem_section *mem_sect;
		int ret;

		if (!present_section_nr(section_nr))
			continue;
		mem_sect = __nr_to_section(section_nr);
		mem_blk = find_memory_block_hinted(mem_sect, mem_blk);
		ret = register_mem_sect_under_node(mem_blk, nid);
		if (!err)
			err = ret;

		/* discard ref obtained in find_memory_block() */
	}

	if (mem_blk)
		kobject_put(&mem_blk->sysdev.kobj);
	return err;
}

#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 */
#else	/* !CONFIG_MEMORY_HOTPLUG_SPARSE */

static int link_mem_sections(int nid) { return 0; }
#endif	/* CONFIG_MEMORY_HOTPLUG_SPARSE */

#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
    !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 = 0;
	int cpu;

	if (node_online(nid)) {
		int p_node = parent_node(nid);
		struct node *parent = NULL;

		if (p_node != nid)
			parent = &node_devices[p_node];

		error = register_node(&node_devices[nid], nid, parent);

		/* link cpu under this node */
		for_each_present_cpu(cpu) {
			if (cpu_to_node(cpu) == nid)
				register_cpu_under_node(cpu, nid);
		}

		/* link memory sections under this node */
		error = link_mem_sections(nid);

		/* initialize work queue for memory hot plug */
		init_node_hugetlb_work(nid);
	}

	return error;

}

void unregister_one_node(int nid)
{
	unregister_node(&node_devices[nid]);
}

/*
 * node states attributes
 */

static ssize_t print_nodes_state(enum node_states state, char *buf)
{
	int n;

	n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
	if (n > 0 && PAGE_SIZE > n + 1) {
		*(buf + n++) = '\n';
		*(buf + n++) = '\0';
	}
	return n;
}

struct node_attr {
	struct sysdev_class_attribute attr;
	enum node_states state;
};

static ssize_t show_node_state(struct sysdev_class *class,
			       struct sysdev_class_attribute *attr, char *buf)
{
	struct node_attr *na = container_of(attr, struct node_attr, attr);
	return print_nodes_state(na->state, buf);
}

#define _NODE_ATTR(name, state) \
	{ _SYSDEV_CLASS_ATTR(name, 0444, show_node_state, NULL), state }

static struct node_attr node_state_attr[] = {
	_NODE_ATTR(possible, N_POSSIBLE),
	_NODE_ATTR(online, N_ONLINE),
	_NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
	_NODE_ATTR(has_cpu, N_CPU),
#ifdef CONFIG_HIGHMEM
	_NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
#endif
};

static struct sysdev_class_attribute *node_state_attrs[] = {
	&node_state_attr[0].attr,
	&node_state_attr[1].attr,
	&node_state_attr[2].attr,
	&node_state_attr[3].attr,
#ifdef CONFIG_HIGHMEM
	&node_state_attr[4].attr,
#endif
	NULL
};

#define NODE_CALLBACK_PRI	2	/* lower than SLAB */
static int __init register_node_type(void)
{
	int ret;

 	BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
 	BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);

	ret = sysdev_class_register(&node_class);
	if (!ret) {
		hotplug_memory_notifier(node_memory_callback,
					NODE_CALLBACK_PRI);
	}

	/*
	 * Note:  we're not going to unregister the node class if we fail
	 * to register the node state class attribute files.
	 */
	return ret;
}
postcore_initcall(register_node_type);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/base/node.c - basic Node class support
	3	*/
	4
	5	#include <linux/sysdev.h>
	6	#include <linux/module.h>
	7	#include <linux/init.h>
	8	#include <linux/mm.h>
c04fc586	9	#include <linux/memory.h>
1da177e4 LT	10	#include <linux/node.h>
1da177e4 LT	11	#include <linux/hugetlb.h>
ed4a6d7f	12	#include <linux/compaction.h>
1da177e4 LT	13	#include <linux/cpumask.h>
	14	#include <linux/topology.h>
	15	#include <linux/nodemask.h>
76b67ed9	16	#include <linux/cpu.h>
bde631a5	17	#include <linux/device.h>
af936a16	18	#include <linux/swap.h>
18e5b539	19	#include <linux/slab.h>
1da177e4	20
3701cde6 AK	21	static struct sysdev_class_attribute *node_state_attrs[];
3701cde6 AK	22
1da177e4	23	static struct sysdev_class node_class = {
af5ca3f4	24	.name = "node",
3701cde6	25	.attrs = node_state_attrs,
1da177e4 LT	26	};
	27
	28
39106dcf	29	static ssize_t node_read_cpumap(struct sys_device dev, int type, char buf)
1da177e4 LT	30	{
1da177e4 LT	31	struct node *node_dev = to_node(dev);
a70f7302	32	const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id);
1da177e4 LT	33	int len;
1da177e4 LT	34
39106dcf MT	35	/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
39106dcf MT	36	BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
1da177e4	37
39106dcf	38	len = type?
29c0177e RR	39	cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
29c0177e RR	40	cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
c5f59f08 MT	41	buf[len++] = '\n';
c5f59f08 MT	42	buf[len] = '\0';
1da177e4 LT	43	return len;
	44	}
	45
4a0b2b4d AK	46	static inline ssize_t node_read_cpumask(struct sys_device *dev,
4a0b2b4d AK	47	struct sysdev_attribute attr, char buf)
39106dcf MT	48	{
	49	return node_read_cpumap(dev, 0, buf);
	50	}
4a0b2b4d AK	51	static inline ssize_t node_read_cpulist(struct sys_device *dev,
4a0b2b4d AK	52	struct sysdev_attribute attr, char buf)
39106dcf MT	53	{
	54	return node_read_cpumap(dev, 1, buf);
	55	}
	56
	57	static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
	58	static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
1da177e4 LT	59
1da177e4 LT	60	#define K(x) ((x) << (PAGE_SHIFT - 10))
4a0b2b4d AK	61	static ssize_t node_read_meminfo(struct sys_device * dev,
4a0b2b4d AK	62	struct sysdev_attribute attr, char buf)
1da177e4 LT	63	{
	64	int n;
	65	int nid = dev->id;
	66	struct sysinfo i;
1da177e4 LT	67
1da177e4 LT	68	si_meminfo_node(&i, nid);
7ee92255	69	n = sprintf(buf,
4f98a2fe RR	70	"Node %d MemTotal: %8lu kB\n"
	71	"Node %d MemFree: %8lu kB\n"
	72	"Node %d MemUsed: %8lu kB\n"
	73	"Node %d Active: %8lu kB\n"
	74	"Node %d Inactive: %8lu kB\n"
	75	"Node %d Active(anon): %8lu kB\n"
	76	"Node %d Inactive(anon): %8lu kB\n"
	77	"Node %d Active(file): %8lu kB\n"
	78	"Node %d Inactive(file): %8lu kB\n"
5344b7e6	79	"Node %d Unevictable: %8lu kB\n"
7ee92255 KM	80	"Node %d Mlocked: %8lu kB\n",
	81	nid, K(i.totalram),
	82	nid, K(i.freeram),
	83	nid, K(i.totalram - i.freeram),
	84	nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
	85	node_page_state(nid, NR_ACTIVE_FILE)),
	86	nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
	87	node_page_state(nid, NR_INACTIVE_FILE)),
	88	nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
	89	nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
	90	nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
	91	nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
	92	nid, K(node_page_state(nid, NR_UNEVICTABLE)),
	93	nid, K(node_page_state(nid, NR_MLOCK)));
	94
182e8e23	95	#ifdef CONFIG_HIGHMEM
7ee92255	96	n += sprintf(buf + n,
4f98a2fe RR	97	"Node %d HighTotal: %8lu kB\n"
	98	"Node %d HighFree: %8lu kB\n"
	99	"Node %d LowTotal: %8lu kB\n"
7ee92255 KM	100	"Node %d LowFree: %8lu kB\n",
	101	nid, K(i.totalhigh),
	102	nid, K(i.freehigh),
	103	nid, K(i.totalram - i.totalhigh),
	104	nid, K(i.freeram - i.freehigh));
182e8e23	105	#endif
7ee92255	106	n += sprintf(buf + n,
4f98a2fe RR	107	"Node %d Dirty: %8lu kB\n"
	108	"Node %d Writeback: %8lu kB\n"
	109	"Node %d FilePages: %8lu kB\n"
	110	"Node %d Mapped: %8lu kB\n"
	111	"Node %d AnonPages: %8lu kB\n"
4b02108a	112	"Node %d Shmem: %8lu kB\n"
c6a7f572	113	"Node %d KernelStack: %8lu kB\n"
4f98a2fe RR	114	"Node %d PageTables: %8lu kB\n"
	115	"Node %d NFS_Unstable: %8lu kB\n"
	116	"Node %d Bounce: %8lu kB\n"
	117	"Node %d WritebackTmp: %8lu kB\n"
	118	"Node %d Slab: %8lu kB\n"
	119	"Node %d SReclaimable: %8lu kB\n"
05b258e9 DR	120	"Node %d SUnreclaim: %8lu kB\n"
	121	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	122	"Node %d AnonHugePages: %8lu kB\n"
	123	#endif
	124	,
b1e7a8fd	125	nid, K(node_page_state(nid, NR_FILE_DIRTY)),
ce866b34	126	nid, K(node_page_state(nid, NR_WRITEBACK)),
347ce434	127	nid, K(node_page_state(nid, NR_FILE_PAGES)),
65ba55f5	128	nid, K(node_page_state(nid, NR_FILE_MAPPED)),
05b258e9 DR	129	nid, K(node_page_state(nid, NR_ANON_PAGES)
	130	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	131	+ node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
	132	HPAGE_PMD_NR
	133	#endif
	134	),
4b02108a	135	nid, K(node_page_state(nid, NR_SHMEM)),
c6a7f572 KM	136	nid, node_page_state(nid, NR_KERNEL_STACK) *
c6a7f572 KM	137	THREAD_SIZE / 1024,
df849a15	138	nid, K(node_page_state(nid, NR_PAGETABLE)),
fd39fc85	139	nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
d2c5e30c	140	nid, K(node_page_state(nid, NR_BOUNCE)),
fc3ba692	141	nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
972d1a7b CL	142	nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
	143	node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
	144	nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
05b258e9 DR	145	nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))
	146	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	147	, nid,
	148	K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
	149	HPAGE_PMD_NR)
	150	#endif
	151	);
1da177e4 LT	152	n += hugetlb_report_node_meminfo(nid, buf + n);
	153	return n;
	154	}
	155
	156	#undef K
	157	static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
	158
4a0b2b4d AK	159	static ssize_t node_read_numastat(struct sys_device * dev,
4a0b2b4d AK	160	struct sysdev_attribute attr, char buf)
1da177e4	161	{
1da177e4 LT	162	return sprintf(buf,
	163	"numa_hit %lu\n"
	164	"numa_miss %lu\n"
	165	"numa_foreign %lu\n"
	166	"interleave_hit %lu\n"
	167	"local_node %lu\n"
	168	"other_node %lu\n",
ca889e6c CL	169	node_page_state(dev->id, NUMA_HIT),
	170	node_page_state(dev->id, NUMA_MISS),
	171	node_page_state(dev->id, NUMA_FOREIGN),
	172	node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
	173	node_page_state(dev->id, NUMA_LOCAL),
	174	node_page_state(dev->id, NUMA_OTHER));
1da177e4 LT	175	}
	176	static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
	177
2ac39037 MR	178	static ssize_t node_read_vmstat(struct sys_device *dev,
	179	struct sysdev_attribute attr, char buf)
	180	{
	181	int nid = dev->id;
	182	return sprintf(buf,
	183	"nr_written %lu\n"
	184	"nr_dirtied %lu\n",
	185	node_page_state(nid, NR_WRITTEN),
	186	node_page_state(nid, NR_DIRTIED));
	187	}
	188	static SYSDEV_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL);
	189
4a0b2b4d AK	190	static ssize_t node_read_distance(struct sys_device * dev,
4a0b2b4d AK	191	struct sysdev_attribute attr, char buf)
1da177e4 LT	192	{
	193	int nid = dev->id;
	194	int len = 0;
	195	int i;
	196
12ee3c0a DR	197	/*
	198	* buf is currently PAGE_SIZE in length and each node needs 4 chars
	199	* at the most (distance + space or newline).
	200	*/
	201	BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
1da177e4 LT	202
	203	for_each_online_node(i)
	204	len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
	205
	206	len += sprintf(buf + len, "\n");
	207	return len;
	208	}
	209	static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
	210
9a305230 LS	211	#ifdef CONFIG_HUGETLBFS
	212	/*
	213	* hugetlbfs per node attributes registration interface:
	214	* When/if hugetlb[fs] subsystem initializes [sometime after this module],
4faf8d95 LS	215	* it will register its per node attributes for all online nodes with
4faf8d95 LS	216	* memory. It will also call register_hugetlbfs_with_node(), below, to
9a305230 LS	217	* register its attribute registration functions with this node driver.
	218	* Once these hooks have been initialized, the node driver will call into
	219	* the hugetlb module to [un]register attributes for hot-plugged nodes.
	220	*/
	221	static node_registration_func_t __hugetlb_register_node;
	222	static node_registration_func_t __hugetlb_unregister_node;
	223
39da08cb	224	static inline bool hugetlb_register_node(struct node *node)
9a305230	225	{
4faf8d95	226	if (__hugetlb_register_node &&
39da08cb	227	node_state(node->sysdev.id, N_HIGH_MEMORY)) {
9a305230	228	__hugetlb_register_node(node);
39da08cb LS	229	return true;
	230	}
	231	return false;
9a305230 LS	232	}
	233
	234	static inline void hugetlb_unregister_node(struct node *node)
	235	{
	236	if (__hugetlb_unregister_node)
	237	__hugetlb_unregister_node(node);
	238	}
	239
	240	void register_hugetlbfs_with_node(node_registration_func_t doregister,
	241	node_registration_func_t unregister)
	242	{
	243	__hugetlb_register_node = doregister;
	244	__hugetlb_unregister_node = unregister;
	245	}
	246	#else
	247	static inline void hugetlb_register_node(struct node *node) {}
	248
	249	static inline void hugetlb_unregister_node(struct node *node) {}
	250	#endif
	251
1da177e4 LT	252
1da177e4 LT	253	/*
405ae7d3	254	* register_node - Setup a sysfs device for a node.
1da177e4 LT	255	* @num - Node number to use when creating the device.
	256	*
	257	* Initialize and register the node device.
	258	*/
4b45099b	259	int register_node(struct node node, int num, struct node parent)
1da177e4 LT	260	{
	261	int error;
	262
	263	node->sysdev.id = num;
	264	node->sysdev.cls = &node_class;
	265	error = sysdev_register(&node->sysdev);
	266
	267	if (!error){
	268	sysdev_create_file(&node->sysdev, &attr_cpumap);
39106dcf	269	sysdev_create_file(&node->sysdev, &attr_cpulist);
1da177e4 LT	270	sysdev_create_file(&node->sysdev, &attr_meminfo);
	271	sysdev_create_file(&node->sysdev, &attr_numastat);
	272	sysdev_create_file(&node->sysdev, &attr_distance);
2ac39037	273	sysdev_create_file(&node->sysdev, &attr_vmstat);
af936a16 LS	274
af936a16 LS	275	scan_unevictable_register_node(node);
4faf8d95	276
9a305230	277	hugetlb_register_node(node);
ed4a6d7f MG	278
ed4a6d7f MG	279	compaction_register_node(node);
1da177e4 LT	280	}
	281	return error;
	282	}
	283
4b45099b KT	284	/**
	285	* unregister_node - unregister a node device
	286	* @node: node going away
	287	*
	288	* Unregisters a node device @node. All the devices on the node must be
	289	* unregistered before calling this function.
	290	*/
	291	void unregister_node(struct node *node)
	292	{
	293	sysdev_remove_file(&node->sysdev, &attr_cpumap);
39106dcf	294	sysdev_remove_file(&node->sysdev, &attr_cpulist);
4b45099b KT	295	sysdev_remove_file(&node->sysdev, &attr_meminfo);
	296	sysdev_remove_file(&node->sysdev, &attr_numastat);
	297	sysdev_remove_file(&node->sysdev, &attr_distance);
2ac39037	298	sysdev_remove_file(&node->sysdev, &attr_vmstat);
4b45099b	299
af936a16	300	scan_unevictable_unregister_node(node);
4faf8d95	301	hugetlb_unregister_node(node); /* no-op, if memoryless node */
af936a16	302
4b45099b KT	303	sysdev_unregister(&node->sysdev);
4b45099b KT	304	}
1da177e4	305
0fc44159 YG	306	struct node node_devices[MAX_NUMNODES];
0fc44159 YG	307
76b67ed9 KH	308	/*
	309	* register cpu under node
	310	*/
	311	int register_cpu_under_node(unsigned int cpu, unsigned int nid)
	312	{
1830794a	313	int ret;
f8246f31	314	struct sys_device *obj;
76b67ed9	315
f8246f31 AC	316	if (!node_online(nid))
	317	return 0;
	318
	319	obj = get_cpu_sysdev(cpu);
	320	if (!obj)
	321	return 0;
	322
1830794a	323	ret = sysfs_create_link(&node_devices[nid].sysdev.kobj,
f8246f31 AC	324	&obj->kobj,
f8246f31 AC	325	kobject_name(&obj->kobj));
1830794a AC	326	if (ret)
	327	return ret;
	328
	329	return sysfs_create_link(&obj->kobj,
	330	&node_devices[nid].sysdev.kobj,
	331	kobject_name(&node_devices[nid].sysdev.kobj));
76b67ed9 KH	332	}
	333
	334	int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
	335	{
b9d52dad AC	336	struct sys_device *obj;
	337
	338	if (!node_online(nid))
	339	return 0;
	340
	341	obj = get_cpu_sysdev(cpu);
	342	if (!obj)
	343	return 0;
	344
	345	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
	346	kobject_name(&obj->kobj));
1830794a AC	347	sysfs_remove_link(&obj->kobj,
1830794a AC	348	kobject_name(&node_devices[nid].sysdev.kobj));
b9d52dad	349
76b67ed9 KH	350	return 0;
	351	}
	352
c04fc586 GH	353	#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
	354	#define page_initialized(page) (page->lru.next)
	355
	356	static int get_nid_for_pfn(unsigned long pfn)
	357	{
	358	struct page *page;
	359
	360	if (!pfn_valid_within(pfn))
	361	return -1;
	362	page = pfn_to_page(pfn);
	363	if (!page_initialized(page))
	364	return -1;
	365	return pfn_to_nid(pfn);
	366	}
	367
	368	/* register memory section under specified node if it spans that node */
	369	int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
	370	{
dee5d0d5	371	int ret;
c04fc586 GH	372	unsigned long pfn, sect_start_pfn, sect_end_pfn;
	373
	374	if (!mem_blk)
	375	return -EFAULT;
	376	if (!node_online(nid))
	377	return 0;
	378	sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
	379	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
	380	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
	381	int page_nid;
	382
	383	page_nid = get_nid_for_pfn(pfn);
	384	if (page_nid < 0)
	385	continue;
	386	if (page_nid != nid)
	387	continue;
dee5d0d5	388	ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
c04fc586 GH	389	&mem_blk->sysdev.kobj,
c04fc586 GH	390	kobject_name(&mem_blk->sysdev.kobj));
dee5d0d5 AC	391	if (ret)
	392	return ret;
	393
	394	return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj,
	395	&node_devices[nid].sysdev.kobj,
	396	kobject_name(&node_devices[nid].sysdev.kobj));
c04fc586 GH	397	}
	398	/* mem section does not span the specified node */
	399	return 0;
	400	}
	401
	402	/* unregister memory section under all nodes that it spans */
	403	int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
	404	{
9ae49fab	405	NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
c04fc586 GH	406	unsigned long pfn, sect_start_pfn, sect_end_pfn;
c04fc586 GH	407
9ae49fab DR	408	if (!mem_blk) {
9ae49fab DR	409	NODEMASK_FREE(unlinked_nodes);
c04fc586	410	return -EFAULT;
9ae49fab DR	411	}
	412	if (!unlinked_nodes)
	413	return -ENOMEM;
	414	nodes_clear(*unlinked_nodes);
c04fc586 GH	415	sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
	416	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
	417	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
47504980	418	int nid;
c04fc586 GH	419
	420	nid = get_nid_for_pfn(pfn);
	421	if (nid < 0)
	422	continue;
	423	if (!node_online(nid))
	424	continue;
9ae49fab	425	if (node_test_and_set(nid, *unlinked_nodes))
c04fc586 GH	426	continue;
	427	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
	428	kobject_name(&mem_blk->sysdev.kobj));
dee5d0d5 AC	429	sysfs_remove_link(&mem_blk->sysdev.kobj,
dee5d0d5 AC	430	kobject_name(&node_devices[nid].sysdev.kobj));
c04fc586	431	}
9ae49fab	432	NODEMASK_FREE(unlinked_nodes);
c04fc586 GH	433	return 0;
	434	}
	435
	436	static int link_mem_sections(int nid)
	437	{
	438	unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
	439	unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
	440	unsigned long pfn;
63d027a6	441	struct memory_block *mem_blk = NULL;
c04fc586 GH	442	int err = 0;
	443
	444	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
	445	unsigned long section_nr = pfn_to_section_nr(pfn);
	446	struct mem_section *mem_sect;
c04fc586 GH	447	int ret;
	448
	449	if (!present_section_nr(section_nr))
	450	continue;
	451	mem_sect = __nr_to_section(section_nr);
63d027a6	452	mem_blk = find_memory_block_hinted(mem_sect, mem_blk);
c04fc586 GH	453	ret = register_mem_sect_under_node(mem_blk, nid);
	454	if (!err)
	455	err = ret;
	456
	457	/* discard ref obtained in find_memory_block() */
c04fc586	458	}
63d027a6 RH	459
	460	if (mem_blk)
	461	kobject_put(&mem_blk->sysdev.kobj);
c04fc586 GH	462	return err;
c04fc586 GH	463	}
4faf8d95	464
39da08cb	465	#ifdef CONFIG_HUGETLBFS
4faf8d95 LS	466	/*
	467	* Handle per node hstate attribute [un]registration on transistions
	468	* to/from memoryless state.
	469	*/
39da08cb LS	470	static void node_hugetlb_work(struct work_struct *work)
	471	{
	472	struct node *node = container_of(work, struct node, node_work);
	473
	474	/*
	475	* We only get here when a node transitions to/from memoryless state.
	476	* We can detect which transition occurred by examining whether the
	477	* node has memory now. hugetlb_register_node() already check this
	478	* so we try to register the attributes. If that fails, then the
	479	* node has transitioned to memoryless, try to unregister the
	480	* attributes.
	481	*/
	482	if (!hugetlb_register_node(node))
	483	hugetlb_unregister_node(node);
	484	}
	485
	486	static void init_node_hugetlb_work(int nid)
	487	{
	488	INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work);
	489	}
4faf8d95 LS	490
	491	static int node_memory_callback(struct notifier_block *self,
	492	unsigned long action, void *arg)
	493	{
	494	struct memory_notify *mnb = arg;
	495	int nid = mnb->status_change_nid;
	496
	497	switch (action) {
39da08cb LS	498	case MEM_ONLINE:
	499	case MEM_OFFLINE:
	500	/*
	501	* offload per node hstate [un]registration to a work thread
	502	* when transitioning to/from memoryless state.
	503	*/
4faf8d95	504	if (nid != NUMA_NO_NODE)
39da08cb	505	schedule_work(&node_devices[nid].node_work);
4faf8d95	506	break;
39da08cb	507
4faf8d95 LS	508	case MEM_GOING_ONLINE:
	509	case MEM_GOING_OFFLINE:
	510	case MEM_CANCEL_ONLINE:
	511	case MEM_CANCEL_OFFLINE:
	512	default:
	513	break;
	514	}
	515
	516	return NOTIFY_OK;
	517	}
39da08cb LS	518	#endif /* CONFIG_HUGETLBFS */
	519	#else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
	520
c04fc586	521	static int link_mem_sections(int nid) { return 0; }
39da08cb	522	#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
4faf8d95	523
39da08cb LS	524	#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) \|\| \
39da08cb LS	525	!defined(CONFIG_HUGETLBFS)
4faf8d95 LS	526	static inline int node_memory_callback(struct notifier_block *self,
	527	unsigned long action, void *arg)
	528	{
	529	return NOTIFY_OK;
	530	}
39da08cb LS	531
	532	static void init_node_hugetlb_work(int nid) { }
	533
	534	#endif
c04fc586	535
0fc44159 YG	536	int register_one_node(int nid)
	537	{
	538	int error = 0;
76b67ed9	539	int cpu;
0fc44159 YG	540
	541	if (node_online(nid)) {
	542	int p_node = parent_node(nid);
	543	struct node *parent = NULL;
	544
	545	if (p_node != nid)
	546	parent = &node_devices[p_node];
	547
	548	error = register_node(&node_devices[nid], nid, parent);
76b67ed9 KH	549
	550	/* link cpu under this node */
	551	for_each_present_cpu(cpu) {
	552	if (cpu_to_node(cpu) == nid)
	553	register_cpu_under_node(cpu, nid);
	554	}
c04fc586 GH	555
	556	/* link memory sections under this node */
	557	error = link_mem_sections(nid);
39da08cb LS	558
	559	/* initialize work queue for memory hot plug */
	560	init_node_hugetlb_work(nid);
0fc44159 YG	561	}
	562
	563	return error;
	564
	565	}
	566
	567	void unregister_one_node(int nid)
	568	{
	569	unregister_node(&node_devices[nid]);
	570	}
	571
bde631a5 LS	572	/*
	573	* node states attributes
	574	*/
	575
	576	static ssize_t print_nodes_state(enum node_states state, char *buf)
	577	{
	578	int n;
	579
	580	n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
	581	if (n > 0 && PAGE_SIZE > n + 1) {
	582	*(buf + n++) = '\n';
	583	*(buf + n++) = '\0';
	584	}
	585	return n;
	586	}
	587
b15f562f AK	588	struct node_attr {
	589	struct sysdev_class_attribute attr;
	590	enum node_states state;
	591	};
bde631a5	592
b15f562f AK	593	static ssize_t show_node_state(struct sysdev_class *class,
b15f562f AK	594	struct sysdev_class_attribute attr, char buf)
bde631a5	595	{
b15f562f AK	596	struct node_attr *na = container_of(attr, struct node_attr, attr);
b15f562f AK	597	return print_nodes_state(na->state, buf);
bde631a5 LS	598	}
bde631a5 LS	599
b15f562f AK	600	#define _NODE_ATTR(name, state) \
b15f562f AK	601	{ _SYSDEV_CLASS_ATTR(name, 0444, show_node_state, NULL), state }
bde631a5	602
b15f562f AK	603	static struct node_attr node_state_attr[] = {
	604	_NODE_ATTR(possible, N_POSSIBLE),
	605	_NODE_ATTR(online, N_ONLINE),
	606	_NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
	607	_NODE_ATTR(has_cpu, N_CPU),
bde631a5	608	#ifdef CONFIG_HIGHMEM
b15f562f	609	_NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
bde631a5	610	#endif
bde631a5 LS	611	};
bde631a5 LS	612
3701cde6 AK	613	static struct sysdev_class_attribute *node_state_attrs[] = {
	614	&node_state_attr[0].attr,
	615	&node_state_attr[1].attr,
	616	&node_state_attr[2].attr,
	617	&node_state_attr[3].attr,
	618	#ifdef CONFIG_HIGHMEM
	619	&node_state_attr[4].attr,
	620	#endif
	621	NULL
	622	};
bde631a5	623
4faf8d95	624	#define NODE_CALLBACK_PRI 2 /* lower than SLAB */
4b45099b	625	static int __init register_node_type(void)
1da177e4	626	{
bde631a5 LS	627	int ret;
bde631a5 LS	628
3701cde6 AK	629	BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
	630	BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
	631
bde631a5	632	ret = sysdev_class_register(&node_class);
4faf8d95	633	if (!ret) {
4faf8d95 LS	634	hotplug_memory_notifier(node_memory_callback,
	635	NODE_CALLBACK_PRI);
	636	}
bde631a5 LS	637
	638	/*
	639	* Note: we're not going to unregister the node class if we fail
	640	* to register the node state class attribute files.
	641	*/
	642	return ret;
1da177e4 LT	643	}
1da177e4 LT	644	postcore_initcall(register_node_type);