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

#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 ___nr = pfn_to_section_nr(pfn);	\
							\
	if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\
		___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);

#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);

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