[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 ___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);

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