[mirror_ubuntu-bionic-kernel.git] / include / linux / memory_hotplug.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_MEMORY_HOTPLUG_H
#define __LINUX_MEMORY_HOTPLUG_H

#include <linux/mmzone.h>
#include <linux/spinlock.h>
#include <linux/notifier.h>
#include <linux/bug.h>

struct page;
struct zone;
struct pglist_data;
struct mem_section;
struct memory_block;
struct resource;

#ifdef CONFIG_MEMORY_HOTPLUG
/*
 * Return page for the valid pfn only if the page is online. All pfn
 * walkers which rely on the fully initialized page->flags and others
 * should use this rather than pfn_valid && pfn_to_page
 */
#define pfn_to_online_page(pfn)					   \
({								   \
	struct page *___page = NULL;				   \
	unsigned long ___pfn = pfn;				   \
	unsigned long ___nr = pfn_to_section_nr(___pfn);	   \
								   \
	if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \
	    pfn_valid_within(___pfn))				   \
		___page = pfn_to_page(___pfn);			   \
	___page;						   \
})

/*
 * Types for free bootmem stored in page->lru.next. These have to be in
 * some random range in unsigned long space for debugging purposes.
 */
enum {
	MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
	SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
	MIX_SECTION_INFO,
	NODE_INFO,
	MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
};

/* Types for control the zone type of onlined and offlined memory */
enum {
	MMOP_OFFLINE = -1,
	MMOP_ONLINE_KEEP,
	MMOP_ONLINE_KERNEL,
	MMOP_ONLINE_MOVABLE,
};

/*
 * pgdat resizing functions
 */
static inline
void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
{
	spin_lock_irqsave(&pgdat->node_size_lock, *flags);
}
static inline
void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
{
	spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
}
static inline
void pgdat_resize_init(struct pglist_data *pgdat)
{
	spin_lock_init(&pgdat->node_size_lock);
}
/*
 * Zone resizing functions
 *
 * Note: any attempt to resize a zone should has pgdat_resize_lock()
 * zone_span_writelock() both held. This ensure the size of a zone
 * can't be changed while pgdat_resize_lock() held.
 */
static inline unsigned zone_span_seqbegin(struct zone *zone)
{
	return read_seqbegin(&zone->span_seqlock);
}
static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
{
	return read_seqretry(&zone->span_seqlock, iv);
}
static inline void zone_span_writelock(struct zone *zone)
{
	write_seqlock(&zone->span_seqlock);
}
static inline void zone_span_writeunlock(struct zone *zone)
{
	write_sequnlock(&zone->span_seqlock);
}
static inline void zone_seqlock_init(struct zone *zone)
{
	seqlock_init(&zone->span_seqlock);
}
extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
/* VM interface that may be used by firmware interface */
extern int online_pages(unsigned long, unsigned long, int);
extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
	unsigned long *valid_start, unsigned long *valid_end);
extern void __offline_isolated_pages(unsigned long, unsigned long);

typedef void (*online_page_callback_t)(struct page *page);

extern int set_online_page_callback(online_page_callback_t callback);
extern int restore_online_page_callback(online_page_callback_t callback);

extern void __online_page_set_limits(struct page *page);
extern void __online_page_increment_counters(struct page *page);
extern void __online_page_free(struct page *page);

extern int try_online_node(int nid);

extern bool memhp_auto_online;
/* If movable_node boot option specified */
extern bool movable_node_enabled;
static inline bool movable_node_is_enabled(void)
{
	return movable_node_enabled;
}

#ifdef CONFIG_MEMORY_HOTREMOVE
extern bool is_pageblock_removable_nolock(struct page *page);
extern int arch_remove_memory(u64 start, u64 size);
extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
	unsigned long nr_pages);
#endif /* CONFIG_MEMORY_HOTREMOVE */

/* reasonably generic interface to expand the physical pages */
extern int __add_pages(int nid, unsigned long start_pfn,
	unsigned long nr_pages, bool want_memblock);

#ifndef CONFIG_ARCH_HAS_ADD_PAGES
static inline int add_pages(int nid, unsigned long start_pfn,
			    unsigned long nr_pages, bool want_memblock)
{
	return __add_pages(nid, start_pfn, nr_pages, want_memblock);
}
#else /* ARCH_HAS_ADD_PAGES */
int add_pages(int nid, unsigned long start_pfn,
	      unsigned long nr_pages, bool want_memblock);
#endif /* ARCH_HAS_ADD_PAGES */

#ifdef CONFIG_NUMA
extern int memory_add_physaddr_to_nid(u64 start);
#else
static inline int memory_add_physaddr_to_nid(u64 start)
{
	return 0;
}
#endif

#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
/*
 * For supporting node-hotadd, we have to allocate a new pgdat.
 *
 * If an arch has generic style NODE_DATA(),
 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
 *
 * In general, generic_alloc_nodedata() is used.
 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
 *
 */
extern pg_data_t *arch_alloc_nodedata(int nid);
extern void arch_free_nodedata(pg_data_t *pgdat);
extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);

#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */

#define arch_alloc_nodedata(nid)	generic_alloc_nodedata(nid)
#define arch_free_nodedata(pgdat)	generic_free_nodedata(pgdat)

#ifdef CONFIG_NUMA
/*
 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
 *	Because, pgdat for the new node is not allocated/initialized yet itself.
 *	To use new node's memory, more consideration will be necessary.
 */
#define generic_alloc_nodedata(nid)				\
({								\
	kzalloc(sizeof(pg_data_t), GFP_KERNEL);			\
})
/*
 * This definition is just for error path in node hotadd.
 * For node hotremove, we have to replace this.
 */
#define generic_free_nodedata(pgdat)	kfree(pgdat)

extern pg_data_t *node_data[];
static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
{
	node_data[nid] = pgdat;
}

#else /* !CONFIG_NUMA */

/* never called */
static inline pg_data_t *generic_alloc_nodedata(int nid)
{
	BUG();
	return NULL;
}
static inline void generic_free_nodedata(pg_data_t *pgdat)
{
}
static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
{
}
#endif /* CONFIG_NUMA */
#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */

#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
#else
static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
{
}
#endif
extern void put_page_bootmem(struct page *page);
extern void get_page_bootmem(unsigned long ingo, struct page *page,
			     unsigned long type);

void get_online_mems(void);
void put_online_mems(void);

void mem_hotplug_begin(void);
void mem_hotplug_done(void);

void set_default_mem_hotplug_zone(enum zone_type zone);

extern void set_zone_contiguous(struct zone *zone);
extern void clear_zone_contiguous(struct zone *zone);

#else /* ! CONFIG_MEMORY_HOTPLUG */
#define pfn_to_online_page(pfn)			\
({						\
	struct page *___page = NULL;		\
	if (pfn_valid(pfn))			\
		___page = pfn_to_page(pfn);	\
	___page;				\
 })

/*
 * Stub functions for when hotplug is off
 */
static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
static inline void pgdat_resize_init(struct pglist_data *pgdat) {}

static inline unsigned zone_span_seqbegin(struct zone *zone)
{
	return 0;
}
static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
{
	return 0;
}
static inline void zone_span_writelock(struct zone *zone) {}
static inline void zone_span_writeunlock(struct zone *zone) {}
static inline void zone_seqlock_init(struct zone *zone) {}

static inline int mhp_notimplemented(const char *func)
{
	printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
	dump_stack();
	return -ENOSYS;
}

static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
{
}

static inline int try_online_node(int nid)
{
	return 0;
}

static inline void get_online_mems(void) {}
static inline void put_online_mems(void) {}

static inline void mem_hotplug_begin(void) {}
static inline void mem_hotplug_done(void) {}

static inline void set_default_mem_hotplug_zone(enum zone_type zone) {}

static inline bool movable_node_is_enabled(void)
{
	return false;
}
#endif /* ! CONFIG_MEMORY_HOTPLUG */

#ifdef CONFIG_MEMORY_HOTREMOVE

extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
extern void try_offline_node(int nid);
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
extern void remove_memory(int nid, u64 start, u64 size);

#else
static inline bool is_mem_section_removable(unsigned long pfn,
					unsigned long nr_pages)
{
	return false;
}

static inline void try_offline_node(int nid) {}

static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
{
	return -EINVAL;
}

static inline void remove_memory(int nid, u64 start, u64 size) {}
#endif /* CONFIG_MEMORY_HOTREMOVE */

extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
		void *arg, int (*func)(struct memory_block *, void *));
extern int __add_memory(int nid, u64 start, u64 size);
extern int add_memory(int nid, u64 start, u64 size);
extern int add_memory_resource(int nid, struct resource *resource, bool online);
extern int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock);
extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
		unsigned long nr_pages);
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
extern bool is_memblock_offlined(struct memory_block *mem);
extern void remove_memory(int nid, u64 start, u64 size);
extern int sparse_add_one_section(struct pglist_data *pgdat, unsigned long start_pfn);
extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
		unsigned long map_offset);
extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
					  unsigned long pnum);
extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
		int online_type);
extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
		unsigned long nr_pages);
#endif /* __LINUX_MEMORY_HOTPLUG_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
208d54e5 DH	2	#ifndef __LINUX_MEMORY_HOTPLUG_H
	3	#define __LINUX_MEMORY_HOTPLUG_H
	4
	5	#include <linux/mmzone.h>
	6	#include <linux/spinlock.h>
3947be19	7	#include <linux/notifier.h>
187f1882	8	#include <linux/bug.h>
208d54e5	9
78679302 KH	10	struct page;
	11	struct zone;
	12	struct pglist_data;
ea01ea93	13	struct mem_section;
e90bdb7f	14	struct memory_block;
62cedb9f	15	struct resource;
78679302	16
208d54e5	17	#ifdef CONFIG_MEMORY_HOTPLUG
2d070eab MH	18	/*
	19	* Return page for the valid pfn only if the page is online. All pfn
	20	* walkers which rely on the fully initialized page->flags and others
	21	* should use this rather than pfn_valid && pfn_to_page
	22	*/
ada8b8da QC	23	#define pfn_to_online_page(pfn) \
	24	({ \
	25	struct page *___page = NULL; \
	26	unsigned long ___pfn = pfn; \
	27	unsigned long ___nr = pfn_to_section_nr(___pfn); \
	28	\
	29	if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \
	30	pfn_valid_within(___pfn)) \
	31	___page = pfn_to_page(___pfn); \
	32	___page; \
2d070eab	33	})
04753278 YG	34
04753278 YG	35	/*
5f24ce5f AA	36	* Types for free bootmem stored in page->lru.next. These have to be in
5f24ce5f AA	37	* some random range in unsigned long space for debugging purposes.
04753278	38	*/
5f24ce5f AA	39	enum {
	40	MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
	41	SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
	42	MIX_SECTION_INFO,
	43	NODE_INFO,
	44	MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
	45	};
04753278	46
4f7c6b49	47	/* Types for control the zone type of onlined and offlined memory */
511c2aba	48	enum {
4f7c6b49 TC	49	MMOP_OFFLINE = -1,
	50	MMOP_ONLINE_KEEP,
	51	MMOP_ONLINE_KERNEL,
	52	MMOP_ONLINE_MOVABLE,
511c2aba LJ	53	};
511c2aba LJ	54
208d54e5 DH	55	/*
	56	* pgdat resizing functions
	57	*/
	58	static inline
	59	void pgdat_resize_lock(struct pglist_data pgdat, unsigned long flags)
	60	{
	61	spin_lock_irqsave(&pgdat->node_size_lock, *flags);
	62	}
	63	static inline
	64	void pgdat_resize_unlock(struct pglist_data pgdat, unsigned long flags)
	65	{
bdc8cb98	66	spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
208d54e5 DH	67	}
	68	static inline
	69	void pgdat_resize_init(struct pglist_data *pgdat)
	70	{
	71	spin_lock_init(&pgdat->node_size_lock);
	72	}
bdc8cb98 DH	73	/*
bdc8cb98 DH	74	* Zone resizing functions
511c2aba LJ	75	*
	76	* Note: any attempt to resize a zone should has pgdat_resize_lock()
	77	* zone_span_writelock() both held. This ensure the size of a zone
	78	* can't be changed while pgdat_resize_lock() held.
bdc8cb98 DH	79	*/
	80	static inline unsigned zone_span_seqbegin(struct zone *zone)
	81	{
	82	return read_seqbegin(&zone->span_seqlock);
	83	}
	84	static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
	85	{
	86	return read_seqretry(&zone->span_seqlock, iv);
	87	}
	88	static inline void zone_span_writelock(struct zone *zone)
	89	{
	90	write_seqlock(&zone->span_seqlock);
	91	}
	92	static inline void zone_span_writeunlock(struct zone *zone)
	93	{
	94	write_sequnlock(&zone->span_seqlock);
	95	}
	96	static inline void zone_seqlock_init(struct zone *zone)
	97	{
	98	seqlock_init(&zone->span_seqlock);
	99	}
3947be19 DH	100	extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
	101	extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
	102	extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
3947be19	103	/* VM interface that may be used by firmware interface */
511c2aba	104	extern int online_pages(unsigned long, unsigned long, int);
a96dfddb TK	105	extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
a96dfddb TK	106	unsigned long valid_start, unsigned long valid_end);
0c0e6195	107	extern void __offline_isolated_pages(unsigned long, unsigned long);
48e94196	108
9d0ad8ca DK	109	typedef void (online_page_callback_t)(struct page page);
	110
	111	extern int set_online_page_callback(online_page_callback_t callback);
	112	extern int restore_online_page_callback(online_page_callback_t callback);
	113
	114	extern void __online_page_set_limits(struct page *page);
	115	extern void __online_page_increment_counters(struct page *page);
	116	extern void __online_page_free(struct page *page);
	117
01b0f197 TK	118	extern int try_online_node(int nid);
01b0f197 TK	119
31bc3858	120	extern bool memhp_auto_online;
4932381e MH	121	/* If movable_node boot option specified */
	122	extern bool movable_node_enabled;
	123	static inline bool movable_node_is_enabled(void)
	124	{
	125	return movable_node_enabled;
	126	}
31bc3858	127
49ac8255 KH	128	#ifdef CONFIG_MEMORY_HOTREMOVE
49ac8255 KH	129	extern bool is_pageblock_removable_nolock(struct page *page);
24d335ca	130	extern int arch_remove_memory(u64 start, u64 size);
4edd7cef DR	131	extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
4edd7cef DR	132	unsigned long nr_pages);
49ac8255 KH	133	#endif /* CONFIG_MEMORY_HOTREMOVE */
49ac8255 KH	134
f1dd2cd1 MH	135	/* reasonably generic interface to expand the physical pages */
f1dd2cd1 MH	136	extern int __add_pages(int nid, unsigned long start_pfn,
1b862aec	137	unsigned long nr_pages, bool want_memblock);
bc02af93	138
3072e413 MH	139	#ifndef CONFIG_ARCH_HAS_ADD_PAGES
	140	static inline int add_pages(int nid, unsigned long start_pfn,
	141	unsigned long nr_pages, bool want_memblock)
	142	{
	143	return __add_pages(nid, start_pfn, nr_pages, want_memblock);
	144	}
	145	#else /* ARCH_HAS_ADD_PAGES */
	146	int add_pages(int nid, unsigned long start_pfn,
	147	unsigned long nr_pages, bool want_memblock);
	148	#endif /* ARCH_HAS_ADD_PAGES */
	149
bc02af93 YG	150	#ifdef CONFIG_NUMA
	151	extern int memory_add_physaddr_to_nid(u64 start);
	152	#else
	153	static inline int memory_add_physaddr_to_nid(u64 start)
	154	{
	155	return 0;
	156	}
	157	#endif
	158
306d6cbe YG	159	#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
	160	/*
	161	* For supporting node-hotadd, we have to allocate a new pgdat.
	162	*
	163	* If an arch has generic style NODE_DATA(),
	164	* node_data[nid] = kzalloc() works well. But it depends on the architecture.
	165	*
	166	* In general, generic_alloc_nodedata() is used.
	167	* Now, arch_free_nodedata() is just defined for error path of node_hot_add.
	168	*
	169	*/
dd0932d9 YG	170	extern pg_data_t *arch_alloc_nodedata(int nid);
dd0932d9 YG	171	extern void arch_free_nodedata(pg_data_t *pgdat);
7049027c	172	extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
306d6cbe YG	173
	174	#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	175
	176	#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
	177	#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
	178
	179	#ifdef CONFIG_NUMA
	180	/*
	181	* If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
	182	* XXX: kmalloc_node() can't work well to get new node's memory at this time.
	183	* Because, pgdat for the new node is not allocated/initialized yet itself.
	184	* To use new node's memory, more consideration will be necessary.
	185	*/
	186	#define generic_alloc_nodedata(nid) \
	187	({ \
	188	kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
	189	})
	190	/*
	191	* This definition is just for error path in node hotadd.
	192	* For node hotremove, we have to replace this.
	193	*/
	194	#define generic_free_nodedata(pgdat) kfree(pgdat)
	195
10ad400b YG	196	extern pg_data_t *node_data[];
	197	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	198	{
	199	node_data[nid] = pgdat;
	200	}
	201
306d6cbe YG	202	#else /* !CONFIG_NUMA */
	203
	204	/* never called */
	205	static inline pg_data_t *generic_alloc_nodedata(int nid)
	206	{
	207	BUG();
	208	return NULL;
	209	}
	210	static inline void generic_free_nodedata(pg_data_t *pgdat)
	211	{
	212	}
10ad400b YG	213	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	214	{
	215	}
306d6cbe YG	216	#endif /* CONFIG_NUMA */
	217	#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	218
46723bfa	219	#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
7ded384a	220	extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
46723bfa	221	#else
04753278 YG	222	static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
	223	{
	224	}
04753278	225	#endif
46723bfa YI	226	extern void put_page_bootmem(struct page *page);
	227	extern void get_page_bootmem(unsigned long ingo, struct page *page,
	228	unsigned long type);
04753278	229
bfc8c901 VD	230	void get_online_mems(void);
bfc8c901 VD	231	void put_online_mems(void);
20d6c96b	232
30467e0b DR	233	void mem_hotplug_begin(void);
	234	void mem_hotplug_done(void);
	235
46e81a18 SF	236	void set_default_mem_hotplug_zone(enum zone_type zone);
46e81a18 SF	237
7cf91a98 JK	238	extern void set_zone_contiguous(struct zone *zone);
	239	extern void clear_zone_contiguous(struct zone *zone);
	240
208d54e5	241	#else /* ! CONFIG_MEMORY_HOTPLUG */
2d070eab MH	242	#define pfn_to_online_page(pfn) \
	243	({ \
	244	struct page *___page = NULL; \
	245	if (pfn_valid(pfn)) \
	246	___page = pfn_to_page(pfn); \
	247	___page; \
	248	})
	249
208d54e5 DH	250	/*
	251	* Stub functions for when hotplug is off
	252	*/
	253	static inline void pgdat_resize_lock(struct pglist_data p, unsigned long f) {}
	254	static inline void pgdat_resize_unlock(struct pglist_data p, unsigned long f) {}
	255	static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
bdc8cb98 DH	256
	257	static inline unsigned zone_span_seqbegin(struct zone *zone)
	258	{
	259	return 0;
	260	}
	261	static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
	262	{
	263	return 0;
	264	}
	265	static inline void zone_span_writelock(struct zone *zone) {}
	266	static inline void zone_span_writeunlock(struct zone *zone) {}
	267	static inline void zone_seqlock_init(struct zone *zone) {}
3947be19 DH	268
	269	static inline int mhp_notimplemented(const char *func)
	270	{
	271	printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
	272	dump_stack();
	273	return -ENOSYS;
	274	}
	275
04753278 YG	276	static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
	277	{
	278	}
	279
01b0f197 TK	280	static inline int try_online_node(int nid)
	281	{
	282	return 0;
	283	}
	284
bfc8c901 VD	285	static inline void get_online_mems(void) {}
bfc8c901 VD	286	static inline void put_online_mems(void) {}
20d6c96b	287
30467e0b DR	288	static inline void mem_hotplug_begin(void) {}
	289	static inline void mem_hotplug_done(void) {}
	290
46e81a18 SF	291	static inline void set_default_mem_hotplug_zone(enum zone_type zone) {}
46e81a18 SF	292
4932381e MH	293	static inline bool movable_node_is_enabled(void)
	294	{
	295	return false;
	296	}
bdc8cb98	297	#endif /* ! CONFIG_MEMORY_HOTPLUG */
9d99aaa3	298
5c755e9f BP	299	#ifdef CONFIG_MEMORY_HOTREMOVE
5c755e9f BP	300
c98940f6	301	extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
90b30cdc	302	extern void try_offline_node(int nid);
aba6efc4 RW	303	extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
aba6efc4 RW	304	extern void remove_memory(int nid, u64 start, u64 size);
5c755e9f BP	305
5c755e9f BP	306	#else
c98940f6	307	static inline bool is_mem_section_removable(unsigned long pfn,
5c755e9f BP	308	unsigned long nr_pages)
5c755e9f BP	309	{
c98940f6	310	return false;
5c755e9f	311	}
90b30cdc WC	312
90b30cdc WC	313	static inline void try_offline_node(int nid) {}
aba6efc4 RW	314
	315	static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
	316	{
	317	return -EINVAL;
	318	}
	319
	320	static inline void remove_memory(int nid, u64 start, u64 size) {}
5c755e9f BP	321	#endif /* CONFIG_MEMORY_HOTREMOVE */
5c755e9f BP	322
e2ff3940 RW	323	extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
e2ff3940 RW	324	void arg, int (func)(struct memory_block , void ));
de29654b	325	extern int __add_memory(int nid, u64 start, u64 size);
bc02af93	326	extern int add_memory(int nid, u64 start, u64 size);
31bc3858	327	extern int add_memory_resource(int nid, struct resource *resource, bool online);
3d79a728	328	extern int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock);
f1dd2cd1 MH	329	extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
f1dd2cd1 MH	330	unsigned long nr_pages);
a16cee10	331	extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
6677e3ea	332	extern bool is_memblock_offlined(struct memory_block *mem);
242831eb	333	extern void remove_memory(int nid, u64 start, u64 size);
f1dd2cd1	334	extern int sparse_add_one_section(struct pglist_data *pgdat, unsigned long start_pfn);
4b94ffdc DW	335	extern void sparse_remove_one_section(struct zone zone, struct mem_section ms,
4b94ffdc DW	336	unsigned long map_offset);
04753278 YG	337	extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
04753278 YG	338	unsigned long pnum);
f1dd2cd1 MH	339	extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
f1dd2cd1 MH	340	int online_type);
e5e68930	341	extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
c246a213	342	unsigned long nr_pages);
208d54e5	343	#endif /* __LINUX_MEMORY_HOTPLUG_H */