[mirror_ubuntu-eoan-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;
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 ___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,
};

/*
 * Restrictions for the memory hotplug:
 * flags:  MHP_ flags
 * altmap: alternative allocator for memmap array
 */
struct mhp_restrictions {
	unsigned long flags;
	struct vmem_altmap *altmap;
};

/*
 * 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 unsigned long __offline_isolated_pages(unsigned long start_pfn,
						unsigned long end_pfn);

typedef void (*online_page_callback_t)(struct page *page, unsigned int order);

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 int arch_add_memory(int nid, u64 start, u64 size,
			struct mhp_restrictions *restrictions);
extern u64 max_mem_size;

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 void arch_remove_memory(int nid, u64 start, u64 size,
			       struct vmem_altmap *altmap);
extern void __remove_pages(struct zone *zone, unsigned long start_pfn,
			   unsigned long nr_pages, struct vmem_altmap *altmap);
#endif /* CONFIG_MEMORY_HOTREMOVE */

/*
 * Do we want sysfs memblock files created. This will allow userspace to online
 * and offline memory explicitly. Lack of this bit means that the caller has to
 * call move_pfn_range_to_zone to finish the initialization.
 */

#define MHP_MEMBLOCK_API               (1<<0)

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

#ifndef CONFIG_ARCH_HAS_ADD_PAGES
static inline int add_pages(int nid, unsigned long start_pfn,
		unsigned long nr_pages, struct mhp_restrictions *restrictions)
{
	return __add_pages(nid, start_pfn, nr_pages, restrictions);
}
#else /* ARCH_HAS_ADD_PAGES */
int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
	      struct mhp_restrictions *restrictions);
#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;				\
 })

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 */

#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
/*
 * 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);
}
#else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
/*
 * 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) {}
#endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */

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

extern void __ref free_area_init_core_hotplug(int nid);
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);
extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
		unsigned long nr_pages, struct vmem_altmap *altmap);
extern bool is_memblock_offlined(struct memory_block *mem);
extern int sparse_add_one_section(int nid, 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	*/
b13bc351 QC	24	#define pfn_to_online_page(pfn) \
	25	({ \
	26	struct page *___page = NULL; \
	27	unsigned long ___pfn = pfn; \
	28	unsigned long ___nr = pfn_to_section_nr(___pfn); \
	29	\
	30	if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \
	31	pfn_valid_within(___pfn)) \
	32	___page = pfn_to_page(___pfn); \
	33	___page; \
2d070eab	34	})
04753278 YG	35
04753278 YG	36	/*
5f24ce5f AA	37	* Types for free bootmem stored in page->lru.next. These have to be in
5f24ce5f AA	38	* some random range in unsigned long space for debugging purposes.
04753278	39	*/
5f24ce5f AA	40	enum {
	41	MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
	42	SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
	43	MIX_SECTION_INFO,
	44	NODE_INFO,
	45	MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
	46	};
04753278	47
4f7c6b49	48	/* Types for control the zone type of onlined and offlined memory */
511c2aba	49	enum {
4f7c6b49 TC	50	MMOP_OFFLINE = -1,
	51	MMOP_ONLINE_KEEP,
	52	MMOP_ONLINE_KERNEL,
	53	MMOP_ONLINE_MOVABLE,
511c2aba LJ	54	};
511c2aba LJ	55
940519f0 MH	56	/*
	57	* Restrictions for the memory hotplug:
	58	* flags: MHP_ flags
	59	* altmap: alternative allocator for memmap array
	60	*/
	61	struct mhp_restrictions {
	62	unsigned long flags;
	63	struct vmem_altmap *altmap;
	64	};
	65
bdc8cb98 DH	66	/*
bdc8cb98 DH	67	* Zone resizing functions
511c2aba LJ	68	*
	69	* Note: any attempt to resize a zone should has pgdat_resize_lock()
	70	* zone_span_writelock() both held. This ensure the size of a zone
	71	* can't be changed while pgdat_resize_lock() held.
bdc8cb98 DH	72	*/
	73	static inline unsigned zone_span_seqbegin(struct zone *zone)
	74	{
	75	return read_seqbegin(&zone->span_seqlock);
	76	}
	77	static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
	78	{
	79	return read_seqretry(&zone->span_seqlock, iv);
	80	}
	81	static inline void zone_span_writelock(struct zone *zone)
	82	{
	83	write_seqlock(&zone->span_seqlock);
	84	}
	85	static inline void zone_span_writeunlock(struct zone *zone)
	86	{
	87	write_sequnlock(&zone->span_seqlock);
	88	}
	89	static inline void zone_seqlock_init(struct zone *zone)
	90	{
	91	seqlock_init(&zone->span_seqlock);
	92	}
3947be19 DH	93	extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
	94	extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
	95	extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
3947be19	96	/* VM interface that may be used by firmware interface */
511c2aba	97	extern int online_pages(unsigned long, unsigned long, int);
a96dfddb TK	98	extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
a96dfddb TK	99	unsigned long valid_start, unsigned long valid_end);
5557c766 MH	100	extern unsigned long __offline_isolated_pages(unsigned long start_pfn,
5557c766 MH	101	unsigned long end_pfn);
48e94196	102
a9cd410a	103	typedef void (online_page_callback_t)(struct page page, unsigned int order);
9d0ad8ca DK	104
	105	extern int set_online_page_callback(online_page_callback_t callback);
	106	extern int restore_online_page_callback(online_page_callback_t callback);
	107
	108	extern void __online_page_set_limits(struct page *page);
	109	extern void __online_page_increment_counters(struct page *page);
	110	extern void __online_page_free(struct page *page);
	111
01b0f197 TK	112	extern int try_online_node(int nid);
01b0f197 TK	113
940519f0 MH	114	extern int arch_add_memory(int nid, u64 start, u64 size,
940519f0 MH	115	struct mhp_restrictions *restrictions);
357b4da5 JG	116	extern u64 max_mem_size;
357b4da5 JG	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	126	#ifdef CONFIG_MEMORY_HOTREMOVE
ac5c9426 DH	127	extern void arch_remove_memory(int nid, u64 start, u64 size,
	128	struct vmem_altmap *altmap);
	129	extern void __remove_pages(struct zone *zone, unsigned long start_pfn,
	130	unsigned long nr_pages, struct vmem_altmap *altmap);
49ac8255 KH	131	#endif /* CONFIG_MEMORY_HOTREMOVE */
49ac8255 KH	132
940519f0 MH	133	/*
	134	* Do we want sysfs memblock files created. This will allow userspace to online
	135	* and offline memory explicitly. Lack of this bit means that the caller has to
	136	* call move_pfn_range_to_zone to finish the initialization.
	137	*/
	138
	139	#define MHP_MEMBLOCK_API (1<<0)
	140
f1dd2cd1	141	/* reasonably generic interface to expand the physical pages */
24e6d5a5	142	extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
940519f0	143	struct mhp_restrictions *restrictions);
bc02af93	144
3072e413 MH	145	#ifndef CONFIG_ARCH_HAS_ADD_PAGES
3072e413 MH	146	static inline int add_pages(int nid, unsigned long start_pfn,
940519f0	147	unsigned long nr_pages, struct mhp_restrictions *restrictions)
3072e413	148	{
940519f0	149	return __add_pages(nid, start_pfn, nr_pages, restrictions);
3072e413 MH	150	}
3072e413 MH	151	#else /* ARCH_HAS_ADD_PAGES */
24e6d5a5	152	int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
940519f0	153	struct mhp_restrictions *restrictions);
3072e413 MH	154	#endif /* ARCH_HAS_ADD_PAGES */
3072e413 MH	155
bc02af93 YG	156	#ifdef CONFIG_NUMA
	157	extern int memory_add_physaddr_to_nid(u64 start);
	158	#else
	159	static inline int memory_add_physaddr_to_nid(u64 start)
	160	{
	161	return 0;
	162	}
	163	#endif
	164
306d6cbe YG	165	#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
	166	/*
	167	* For supporting node-hotadd, we have to allocate a new pgdat.
	168	*
	169	* If an arch has generic style NODE_DATA(),
	170	* node_data[nid] = kzalloc() works well. But it depends on the architecture.
	171	*
	172	* In general, generic_alloc_nodedata() is used.
	173	* Now, arch_free_nodedata() is just defined for error path of node_hot_add.
	174	*
	175	*/
dd0932d9 YG	176	extern pg_data_t *arch_alloc_nodedata(int nid);
dd0932d9 YG	177	extern void arch_free_nodedata(pg_data_t *pgdat);
7049027c	178	extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
306d6cbe YG	179
	180	#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	181
	182	#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
	183	#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
	184
	185	#ifdef CONFIG_NUMA
	186	/*
	187	* If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
	188	* XXX: kmalloc_node() can't work well to get new node's memory at this time.
	189	* Because, pgdat for the new node is not allocated/initialized yet itself.
	190	* To use new node's memory, more consideration will be necessary.
	191	*/
	192	#define generic_alloc_nodedata(nid) \
	193	({ \
	194	kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
	195	})
	196	/*
	197	* This definition is just for error path in node hotadd.
	198	* For node hotremove, we have to replace this.
	199	*/
	200	#define generic_free_nodedata(pgdat) kfree(pgdat)
	201
10ad400b YG	202	extern pg_data_t *node_data[];
	203	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	204	{
	205	node_data[nid] = pgdat;
	206	}
	207
306d6cbe YG	208	#else /* !CONFIG_NUMA */
	209
	210	/* never called */
	211	static inline pg_data_t *generic_alloc_nodedata(int nid)
	212	{
	213	BUG();
	214	return NULL;
	215	}
	216	static inline void generic_free_nodedata(pg_data_t *pgdat)
	217	{
	218	}
10ad400b YG	219	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	220	{
	221	}
306d6cbe YG	222	#endif /* CONFIG_NUMA */
	223	#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	224
46723bfa	225	#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
7ded384a	226	extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
46723bfa	227	#else
04753278 YG	228	static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
	229	{
	230	}
04753278	231	#endif
46723bfa YI	232	extern void put_page_bootmem(struct page *page);
	233	extern void get_page_bootmem(unsigned long ingo, struct page *page,
	234	unsigned long type);
04753278	235
bfc8c901 VD	236	void get_online_mems(void);
bfc8c901 VD	237	void put_online_mems(void);
20d6c96b	238
30467e0b DR	239	void mem_hotplug_begin(void);
	240	void mem_hotplug_done(void);
	241
d883c6cf JK	242	extern void set_zone_contiguous(struct zone *zone);
	243	extern void clear_zone_contiguous(struct zone *zone);
	244
208d54e5	245	#else /* ! CONFIG_MEMORY_HOTPLUG */
2d070eab MH	246	#define pfn_to_online_page(pfn) \
	247	({ \
	248	struct page *___page = NULL; \
	249	if (pfn_valid(pfn)) \
	250	___page = pfn_to_page(pfn); \
	251	___page; \
	252	})
	253
bdc8cb98 DH	254	static inline unsigned zone_span_seqbegin(struct zone *zone)
	255	{
	256	return 0;
	257	}
	258	static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
	259	{
	260	return 0;
	261	}
	262	static inline void zone_span_writelock(struct zone *zone) {}
	263	static inline void zone_span_writeunlock(struct zone *zone) {}
	264	static inline void zone_seqlock_init(struct zone *zone) {}
3947be19 DH	265
	266	static inline int mhp_notimplemented(const char *func)
	267	{
	268	printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
	269	dump_stack();
	270	return -ENOSYS;
	271	}
	272
04753278 YG	273	static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
	274	{
	275	}
	276
01b0f197 TK	277	static inline int try_online_node(int nid)
	278	{
	279	return 0;
	280	}
	281
bfc8c901 VD	282	static inline void get_online_mems(void) {}
bfc8c901 VD	283	static inline void put_online_mems(void) {}
20d6c96b	284
30467e0b DR	285	static inline void mem_hotplug_begin(void) {}
	286	static inline void mem_hotplug_done(void) {}
	287
4932381e MH	288	static inline bool movable_node_is_enabled(void)
	289	{
	290	return false;
	291	}
bdc8cb98	292	#endif /* ! CONFIG_MEMORY_HOTPLUG */
9d99aaa3	293
3a2d7fa8 PT	294	#if defined(CONFIG_MEMORY_HOTPLUG) \|\| defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
	295	/*
	296	* pgdat resizing functions
	297	*/
	298	static inline
	299	void pgdat_resize_lock(struct pglist_data pgdat, unsigned long flags)
	300	{
	301	spin_lock_irqsave(&pgdat->node_size_lock, *flags);
	302	}
	303	static inline
	304	void pgdat_resize_unlock(struct pglist_data pgdat, unsigned long flags)
	305	{
	306	spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
	307	}
	308	static inline
	309	void pgdat_resize_init(struct pglist_data *pgdat)
	310	{
	311	spin_lock_init(&pgdat->node_size_lock);
	312	}
	313	#else /* !(CONFIG_MEMORY_HOTPLUG \|\| CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
	314	/*
	315	* Stub functions for when hotplug is off
	316	*/
	317	static inline void pgdat_resize_lock(struct pglist_data p, unsigned long f) {}
	318	static inline void pgdat_resize_unlock(struct pglist_data p, unsigned long f) {}
	319	static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
	320	#endif /* !(CONFIG_MEMORY_HOTPLUG \|\| CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
	321
5c755e9f BP	322	#ifdef CONFIG_MEMORY_HOTREMOVE
5c755e9f BP	323
c98940f6	324	extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
90b30cdc	325	extern void try_offline_node(int nid);
aba6efc4 RW	326	extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
aba6efc4 RW	327	extern void remove_memory(int nid, u64 start, u64 size);
d15e5926	328	extern void __remove_memory(int nid, u64 start, u64 size);
5c755e9f BP	329
5c755e9f BP	330	#else
c98940f6	331	static inline bool is_mem_section_removable(unsigned long pfn,
5c755e9f BP	332	unsigned long nr_pages)
5c755e9f BP	333	{
c98940f6	334	return false;
5c755e9f	335	}
90b30cdc WC	336
90b30cdc WC	337	static inline void try_offline_node(int nid) {}
aba6efc4 RW	338
	339	static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
	340	{
	341	return -EINVAL;
	342	}
	343
	344	static inline void remove_memory(int nid, u64 start, u64 size) {}
d15e5926	345	static inline void __remove_memory(int nid, u64 start, u64 size) {}
5c755e9f BP	346	#endif /* CONFIG_MEMORY_HOTREMOVE */
5c755e9f BP	347
03e85f9d	348	extern void __ref free_area_init_core_hotplug(int nid);
e2ff3940 RW	349	extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
e2ff3940 RW	350	void arg, int (func)(struct memory_block , void ));
8df1d0e4	351	extern int __add_memory(int nid, u64 start, u64 size);
bc02af93	352	extern int add_memory(int nid, u64 start, u64 size);
f29d8e9c	353	extern int add_memory_resource(int nid, struct resource *resource);
f1dd2cd1	354	extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
a99583e7	355	unsigned long nr_pages, struct vmem_altmap *altmap);
6677e3ea	356	extern bool is_memblock_offlined(struct memory_block *mem);
4e0d2e7e WY	357	extern int sparse_add_one_section(int nid, unsigned long start_pfn,
4e0d2e7e WY	358	struct vmem_altmap *altmap);
4b94ffdc	359	extern void sparse_remove_one_section(struct zone zone, struct mem_section ms,
24b6d416	360	unsigned long map_offset, struct vmem_altmap *altmap);
04753278 YG	361	extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
04753278 YG	362	unsigned long pnum);
f1dd2cd1 MH	363	extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
f1dd2cd1 MH	364	int online_type);
e5e68930	365	extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
c246a213	366	unsigned long nr_pages);
208d54e5	367	#endif /* __LINUX_MEMORY_HOTPLUG_H */