[linux-2.6-block.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;
struct vmem_altmap;

#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,
		struct vmem_altmap *altmap);
extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
	unsigned long nr_pages, struct vmem_altmap *altmap);
#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,
		struct vmem_altmap *altmap, bool want_memblock);

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

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,
		struct vmem_altmap *altmap, bool want_memblock);
extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
		unsigned long nr_pages, struct vmem_altmap *altmap);
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, struct vmem_altmap *altmap);
extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
		unsigned long map_offset, struct vmem_altmap *altmap);
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;
24e6d5a5	16	struct vmem_altmap;
78679302	17
208d54e5	18	#ifdef CONFIG_MEMORY_HOTPLUG
2d070eab MH	19	/*
	20	* Return page for the valid pfn only if the page is online. All pfn
	21	* walkers which rely on the fully initialized page->flags and others
	22	* should use this rather than pfn_valid && pfn_to_page
	23	*/
	24	#define pfn_to_online_page(pfn) \
	25	({ \
	26	struct page *___page = NULL; \
	27	unsigned long ___nr = pfn_to_section_nr(pfn); \
	28	\
	29	if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\
	30	___page = pfn_to_page(pfn); \
	31	___page; \
	32	})
04753278 YG	33
04753278 YG	34	/*
5f24ce5f AA	35	* Types for free bootmem stored in page->lru.next. These have to be in
5f24ce5f AA	36	* some random range in unsigned long space for debugging purposes.
04753278	37	*/
5f24ce5f AA	38	enum {
	39	MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
	40	SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
	41	MIX_SECTION_INFO,
	42	NODE_INFO,
	43	MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
	44	};
04753278	45
4f7c6b49	46	/* Types for control the zone type of onlined and offlined memory */
511c2aba	47	enum {
4f7c6b49 TC	48	MMOP_OFFLINE = -1,
	49	MMOP_ONLINE_KEEP,
	50	MMOP_ONLINE_KERNEL,
	51	MMOP_ONLINE_MOVABLE,
511c2aba LJ	52	};
511c2aba LJ	53
208d54e5 DH	54	/*
	55	* pgdat resizing functions
	56	*/
	57	static inline
	58	void pgdat_resize_lock(struct pglist_data pgdat, unsigned long flags)
	59	{
	60	spin_lock_irqsave(&pgdat->node_size_lock, *flags);
	61	}
	62	static inline
	63	void pgdat_resize_unlock(struct pglist_data pgdat, unsigned long flags)
	64	{
bdc8cb98	65	spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
208d54e5 DH	66	}
	67	static inline
	68	void pgdat_resize_init(struct pglist_data *pgdat)
	69	{
	70	spin_lock_init(&pgdat->node_size_lock);
	71	}
bdc8cb98 DH	72	/*
bdc8cb98 DH	73	* Zone resizing functions
511c2aba LJ	74	*
	75	* Note: any attempt to resize a zone should has pgdat_resize_lock()
	76	* zone_span_writelock() both held. This ensure the size of a zone
	77	* can't be changed while pgdat_resize_lock() held.
bdc8cb98 DH	78	*/
	79	static inline unsigned zone_span_seqbegin(struct zone *zone)
	80	{
	81	return read_seqbegin(&zone->span_seqlock);
	82	}
	83	static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
	84	{
	85	return read_seqretry(&zone->span_seqlock, iv);
	86	}
	87	static inline void zone_span_writelock(struct zone *zone)
	88	{
	89	write_seqlock(&zone->span_seqlock);
	90	}
	91	static inline void zone_span_writeunlock(struct zone *zone)
	92	{
	93	write_sequnlock(&zone->span_seqlock);
	94	}
	95	static inline void zone_seqlock_init(struct zone *zone)
	96	{
	97	seqlock_init(&zone->span_seqlock);
	98	}
3947be19 DH	99	extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
	100	extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
	101	extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
3947be19	102	/* VM interface that may be used by firmware interface */
511c2aba	103	extern int online_pages(unsigned long, unsigned long, int);
a96dfddb TK	104	extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
a96dfddb TK	105	unsigned long valid_start, unsigned long valid_end);
0c0e6195	106	extern void __offline_isolated_pages(unsigned long, unsigned long);
48e94196	107
9d0ad8ca DK	108	typedef void (online_page_callback_t)(struct page page);
	109
	110	extern int set_online_page_callback(online_page_callback_t callback);
	111	extern int restore_online_page_callback(online_page_callback_t callback);
	112
	113	extern void __online_page_set_limits(struct page *page);
	114	extern void __online_page_increment_counters(struct page *page);
	115	extern void __online_page_free(struct page *page);
	116
01b0f197 TK	117	extern int try_online_node(int nid);
01b0f197 TK	118
31bc3858	119	extern bool memhp_auto_online;
4932381e MH	120	/* If movable_node boot option specified */
	121	extern bool movable_node_enabled;
	122	static inline bool movable_node_is_enabled(void)
	123	{
	124	return movable_node_enabled;
	125	}
31bc3858	126
49ac8255 KH	127	#ifdef CONFIG_MEMORY_HOTREMOVE
49ac8255 KH	128	extern bool is_pageblock_removable_nolock(struct page *page);
da024512 CH	129	extern int arch_remove_memory(u64 start, u64 size,
da024512 CH	130	struct vmem_altmap *altmap);
4edd7cef	131	extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
da024512	132	unsigned long nr_pages, struct vmem_altmap *altmap);
49ac8255 KH	133	#endif /* CONFIG_MEMORY_HOTREMOVE */
49ac8255 KH	134
f1dd2cd1	135	/* reasonably generic interface to expand the physical pages */
24e6d5a5 CH	136	extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
24e6d5a5 CH	137	struct vmem_altmap *altmap, bool want_memblock);
bc02af93	138
3072e413 MH	139	#ifndef CONFIG_ARCH_HAS_ADD_PAGES
3072e413 MH	140	static inline int add_pages(int nid, unsigned long start_pfn,
24e6d5a5 CH	141	unsigned long nr_pages, struct vmem_altmap *altmap,
24e6d5a5 CH	142	bool want_memblock)
3072e413	143	{
24e6d5a5	144	return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
3072e413 MH	145	}
3072e413 MH	146	#else /* ARCH_HAS_ADD_PAGES */
24e6d5a5 CH	147	int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
24e6d5a5 CH	148	struct vmem_altmap *altmap, bool want_memblock);
3072e413 MH	149	#endif /* ARCH_HAS_ADD_PAGES */
3072e413 MH	150
bc02af93 YG	151	#ifdef CONFIG_NUMA
	152	extern int memory_add_physaddr_to_nid(u64 start);
	153	#else
	154	static inline int memory_add_physaddr_to_nid(u64 start)
	155	{
	156	return 0;
	157	}
	158	#endif
	159
306d6cbe YG	160	#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
	161	/*
	162	* For supporting node-hotadd, we have to allocate a new pgdat.
	163	*
	164	* If an arch has generic style NODE_DATA(),
	165	* node_data[nid] = kzalloc() works well. But it depends on the architecture.
	166	*
	167	* In general, generic_alloc_nodedata() is used.
	168	* Now, arch_free_nodedata() is just defined for error path of node_hot_add.
	169	*
	170	*/
dd0932d9 YG	171	extern pg_data_t *arch_alloc_nodedata(int nid);
dd0932d9 YG	172	extern void arch_free_nodedata(pg_data_t *pgdat);
7049027c	173	extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
306d6cbe YG	174
	175	#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	176
	177	#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
	178	#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
	179
	180	#ifdef CONFIG_NUMA
	181	/*
	182	* If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
	183	* XXX: kmalloc_node() can't work well to get new node's memory at this time.
	184	* Because, pgdat for the new node is not allocated/initialized yet itself.
	185	* To use new node's memory, more consideration will be necessary.
	186	*/
	187	#define generic_alloc_nodedata(nid) \
	188	({ \
	189	kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
	190	})
	191	/*
	192	* This definition is just for error path in node hotadd.
	193	* For node hotremove, we have to replace this.
	194	*/
	195	#define generic_free_nodedata(pgdat) kfree(pgdat)
	196
10ad400b YG	197	extern pg_data_t *node_data[];
	198	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	199	{
	200	node_data[nid] = pgdat;
	201	}
	202
306d6cbe YG	203	#else /* !CONFIG_NUMA */
	204
	205	/* never called */
	206	static inline pg_data_t *generic_alloc_nodedata(int nid)
	207	{
	208	BUG();
	209	return NULL;
	210	}
	211	static inline void generic_free_nodedata(pg_data_t *pgdat)
	212	{
	213	}
10ad400b YG	214	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	215	{
	216	}
306d6cbe YG	217	#endif /* CONFIG_NUMA */
	218	#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	219
46723bfa	220	#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
7ded384a	221	extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
46723bfa	222	#else
04753278 YG	223	static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
	224	{
	225	}
04753278	226	#endif
46723bfa YI	227	extern void put_page_bootmem(struct page *page);
	228	extern void get_page_bootmem(unsigned long ingo, struct page *page,
	229	unsigned long type);
04753278	230
bfc8c901 VD	231	void get_online_mems(void);
bfc8c901 VD	232	void put_online_mems(void);
20d6c96b	233
30467e0b DR	234	void mem_hotplug_begin(void);
	235	void mem_hotplug_done(void);
	236
7cf91a98 JK	237	extern void set_zone_contiguous(struct zone *zone);
	238	extern void clear_zone_contiguous(struct zone *zone);
	239
208d54e5	240	#else /* ! CONFIG_MEMORY_HOTPLUG */
2d070eab MH	241	#define pfn_to_online_page(pfn) \
	242	({ \
	243	struct page *___page = NULL; \
	244	if (pfn_valid(pfn)) \
	245	___page = pfn_to_page(pfn); \
	246	___page; \
	247	})
	248
208d54e5 DH	249	/*
	250	* Stub functions for when hotplug is off
	251	*/
	252	static inline void pgdat_resize_lock(struct pglist_data p, unsigned long f) {}
	253	static inline void pgdat_resize_unlock(struct pglist_data p, unsigned long f) {}
	254	static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
bdc8cb98 DH	255
	256	static inline unsigned zone_span_seqbegin(struct zone *zone)
	257	{
	258	return 0;
	259	}
	260	static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
	261	{
	262	return 0;
	263	}
	264	static inline void zone_span_writelock(struct zone *zone) {}
	265	static inline void zone_span_writeunlock(struct zone *zone) {}
	266	static inline void zone_seqlock_init(struct zone *zone) {}
3947be19 DH	267
	268	static inline int mhp_notimplemented(const char *func)
	269	{
	270	printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
	271	dump_stack();
	272	return -ENOSYS;
	273	}
	274
04753278 YG	275	static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
	276	{
	277	}
	278
01b0f197 TK	279	static inline int try_online_node(int nid)
	280	{
	281	return 0;
	282	}
	283
bfc8c901 VD	284	static inline void get_online_mems(void) {}
bfc8c901 VD	285	static inline void put_online_mems(void) {}
20d6c96b	286
30467e0b DR	287	static inline void mem_hotplug_begin(void) {}
	288	static inline void mem_hotplug_done(void) {}
	289
4932381e MH	290	static inline bool movable_node_is_enabled(void)
	291	{
	292	return false;
	293	}
bdc8cb98	294	#endif /* ! CONFIG_MEMORY_HOTPLUG */
9d99aaa3	295
5c755e9f BP	296	#ifdef CONFIG_MEMORY_HOTREMOVE
5c755e9f BP	297
c98940f6	298	extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
90b30cdc	299	extern void try_offline_node(int nid);
aba6efc4 RW	300	extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
aba6efc4 RW	301	extern void remove_memory(int nid, u64 start, u64 size);
5c755e9f BP	302
5c755e9f BP	303	#else
c98940f6	304	static inline bool is_mem_section_removable(unsigned long pfn,
5c755e9f BP	305	unsigned long nr_pages)
5c755e9f BP	306	{
c98940f6	307	return false;
5c755e9f	308	}
90b30cdc WC	309
90b30cdc WC	310	static inline void try_offline_node(int nid) {}
aba6efc4 RW	311
	312	static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
	313	{
	314	return -EINVAL;
	315	}
	316
	317	static inline void remove_memory(int nid, u64 start, u64 size) {}
5c755e9f BP	318	#endif /* CONFIG_MEMORY_HOTREMOVE */
5c755e9f BP	319
e2ff3940 RW	320	extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
e2ff3940 RW	321	void arg, int (func)(struct memory_block , void ));
bc02af93	322	extern int add_memory(int nid, u64 start, u64 size);
31bc3858	323	extern int add_memory_resource(int nid, struct resource *resource, bool online);
24e6d5a5 CH	324	extern int arch_add_memory(int nid, u64 start, u64 size,
24e6d5a5 CH	325	struct vmem_altmap *altmap, bool want_memblock);
f1dd2cd1	326	extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
a99583e7	327	unsigned long nr_pages, struct vmem_altmap *altmap);
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);
7b73d978 CH	331	extern int sparse_add_one_section(struct pglist_data *pgdat,
7b73d978 CH	332	unsigned long start_pfn, struct vmem_altmap *altmap);
4b94ffdc	333	extern void sparse_remove_one_section(struct zone zone, struct mem_section ms,
24b6d416	334	unsigned long map_offset, struct vmem_altmap *altmap);
04753278 YG	335	extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
04753278 YG	336	unsigned long pnum);
f1dd2cd1 MH	337	extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
f1dd2cd1 MH	338	int online_type);
e5e68930	339	extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
c246a213	340	unsigned long nr_pages);
208d54e5	341	#endif /* __LINUX_MEMORY_HOTPLUG_H */