[linux-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 ___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 {
	/* Offline the memory. */
	MMOP_OFFLINE = 0,
	/* Online the memory. Zone depends, see default_zone_for_pfn(). */
	MMOP_ONLINE,
	/* Online the memory to ZONE_NORMAL. */
	MMOP_ONLINE_KERNEL,
	/* Online the memory to ZONE_MOVABLE. */
	MMOP_ONLINE_MOVABLE,
};

/*
 * Extended parameters for memory hotplug:
 * altmap: alternative allocator for memmap array (optional)
 * pgprot: page protection flags to apply to newly created page tables
 *	(required)
 */
struct mhp_params {
	struct vmem_altmap *altmap;
	pgprot_t pgprot;
};

/*
 * 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 pfn, unsigned long nr_pages,
			int online_type, int nid);
extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
					 unsigned long end_pfn);
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 void generic_online_page(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 int try_online_node(int nid);

extern int arch_add_memory(int nid, u64 start, u64 size,
			   struct mhp_params *params);
extern u64 max_mem_size;

extern int memhp_online_type_from_str(const char *str);

/* Default online_type (MMOP_*) when new memory blocks are added. */
extern int memhp_default_online_type;
/* If movable_node boot option specified */
extern bool movable_node_enabled;
static inline bool movable_node_is_enabled(void)
{
	return movable_node_enabled;
}

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

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

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

#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 void try_offline_node(int nid);
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
extern int remove_memory(int nid, u64 start, u64 size);
extern void __remove_memory(int nid, u64 start, u64 size);
extern int offline_and_remove_memory(int nid, u64 start, u64 size);

#else
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 int remove_memory(int nid, u64 start, u64 size)
{
	return -EBUSY;
}

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

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

extern void __ref free_area_init_core_hotplug(int nid);
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 int add_memory_driver_managed(int nid, u64 start, u64 size,
				     const char *resource_name);
extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
		unsigned long nr_pages, struct vmem_altmap *altmap);
extern void remove_pfn_range_from_zone(struct zone *zone,
				       unsigned long start_pfn,
				       unsigned long nr_pages);
extern bool is_memblock_offlined(struct memory_block *mem);
extern int sparse_add_section(int nid, unsigned long pfn,
		unsigned long nr_pages, struct vmem_altmap *altmap);
extern void sparse_remove_section(struct mem_section *ms,
		unsigned long pfn, unsigned long nr_pages,
		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 {
956f8b44	50	/* Offline the memory. */
efc978ad	51	MMOP_OFFLINE = 0,
956f8b44 DH	52	/* Online the memory. Zone depends, see default_zone_for_pfn(). */
	53	MMOP_ONLINE,
	54	/* Online the memory to ZONE_NORMAL. */
4f7c6b49	55	MMOP_ONLINE_KERNEL,
956f8b44	56	/* Online the memory to ZONE_MOVABLE. */
4f7c6b49	57	MMOP_ONLINE_MOVABLE,
511c2aba LJ	58	};
511c2aba LJ	59
940519f0	60	/*
f5637d3b LG	61	* Extended parameters for memory hotplug:
f5637d3b LG	62	* altmap: alternative allocator for memmap array (optional)
bfeb022f LG	63	* pgprot: page protection flags to apply to newly created page tables
bfeb022f LG	64	* (required)
940519f0	65	*/
f5637d3b	66	struct mhp_params {
940519f0	67	struct vmem_altmap *altmap;
bfeb022f	68	pgprot_t pgprot;
940519f0 MH	69	};
940519f0 MH	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 */
bd5c2344 DH	102	extern int online_pages(unsigned long pfn, unsigned long nr_pages,
bd5c2344 DH	103	int online_type, int nid);
92917998 DH	104	extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
92917998 DH	105	unsigned long end_pfn);
5557c766 MH	106	extern unsigned long __offline_isolated_pages(unsigned long start_pfn,
5557c766 MH	107	unsigned long end_pfn);
48e94196	108
a9cd410a	109	typedef void (online_page_callback_t)(struct page page, unsigned int order);
9d0ad8ca	110
18db1491	111	extern void generic_online_page(struct page *page, unsigned int order);
9d0ad8ca DK	112	extern int set_online_page_callback(online_page_callback_t callback);
	113	extern int restore_online_page_callback(online_page_callback_t callback);
	114
01b0f197 TK	115	extern int try_online_node(int nid);
01b0f197 TK	116
940519f0	117	extern int arch_add_memory(int nid, u64 start, u64 size,
f5637d3b	118	struct mhp_params *params);
357b4da5 JG	119	extern u64 max_mem_size;
357b4da5 JG	120
5f47adf7 DH	121	extern int memhp_online_type_from_str(const char *str);
5f47adf7 DH	122
862919e5 DH	123	/* Default online_type (MMOP_) when new memory blocks are added. /
862919e5 DH	124	extern int memhp_default_online_type;
4932381e MH	125	/* If movable_node boot option specified */
	126	extern bool movable_node_enabled;
	127	static inline bool movable_node_is_enabled(void)
	128	{
	129	return movable_node_enabled;
	130	}
31bc3858	131
ac5c9426 DH	132	extern void arch_remove_memory(int nid, u64 start, u64 size,
ac5c9426 DH	133	struct vmem_altmap *altmap);
feee6b29 DH	134	extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
feee6b29 DH	135	struct vmem_altmap *altmap);
49ac8255	136
f1dd2cd1	137	/* reasonably generic interface to expand the physical pages */
24e6d5a5	138	extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
f5637d3b	139	struct mhp_params *params);
bc02af93	140
3072e413 MH	141	#ifndef CONFIG_ARCH_HAS_ADD_PAGES
3072e413 MH	142	static inline int add_pages(int nid, unsigned long start_pfn,
f5637d3b	143	unsigned long nr_pages, struct mhp_params *params)
3072e413	144	{
f5637d3b	145	return __add_pages(nid, start_pfn, nr_pages, params);
3072e413 MH	146	}
3072e413 MH	147	#else /* ARCH_HAS_ADD_PAGES */
24e6d5a5	148	int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
f5637d3b	149	struct mhp_params *params);
3072e413 MH	150	#endif /* ARCH_HAS_ADD_PAGES */
3072e413 MH	151
bc02af93 YG	152	#ifdef CONFIG_NUMA
	153	extern int memory_add_physaddr_to_nid(u64 start);
	154	#else
	155	static inline int memory_add_physaddr_to_nid(u64 start)
	156	{
	157	return 0;
	158	}
	159	#endif
	160
306d6cbe YG	161	#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
	162	/*
	163	* For supporting node-hotadd, we have to allocate a new pgdat.
	164	*
	165	* If an arch has generic style NODE_DATA(),
	166	* node_data[nid] = kzalloc() works well. But it depends on the architecture.
	167	*
	168	* In general, generic_alloc_nodedata() is used.
	169	* Now, arch_free_nodedata() is just defined for error path of node_hot_add.
	170	*
	171	*/
dd0932d9 YG	172	extern pg_data_t *arch_alloc_nodedata(int nid);
dd0932d9 YG	173	extern void arch_free_nodedata(pg_data_t *pgdat);
7049027c	174	extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
306d6cbe YG	175
	176	#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	177
	178	#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
	179	#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
	180
	181	#ifdef CONFIG_NUMA
	182	/*
	183	* If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
	184	* XXX: kmalloc_node() can't work well to get new node's memory at this time.
	185	* Because, pgdat for the new node is not allocated/initialized yet itself.
	186	* To use new node's memory, more consideration will be necessary.
	187	*/
	188	#define generic_alloc_nodedata(nid) \
	189	({ \
	190	kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
	191	})
	192	/*
	193	* This definition is just for error path in node hotadd.
	194	* For node hotremove, we have to replace this.
	195	*/
	196	#define generic_free_nodedata(pgdat) kfree(pgdat)
	197
10ad400b YG	198	extern pg_data_t *node_data[];
	199	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	200	{
	201	node_data[nid] = pgdat;
	202	}
	203
306d6cbe YG	204	#else /* !CONFIG_NUMA */
	205
	206	/* never called */
	207	static inline pg_data_t *generic_alloc_nodedata(int nid)
	208	{
	209	BUG();
	210	return NULL;
	211	}
	212	static inline void generic_free_nodedata(pg_data_t *pgdat)
	213	{
	214	}
10ad400b YG	215	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	216	{
	217	}
306d6cbe YG	218	#endif /* CONFIG_NUMA */
	219	#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	220
46723bfa	221	#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
7ded384a	222	extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
46723bfa	223	#else
04753278 YG	224	static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
	225	{
	226	}
04753278	227	#endif
46723bfa YI	228	extern void put_page_bootmem(struct page *page);
	229	extern void get_page_bootmem(unsigned long ingo, struct page *page,
	230	unsigned long type);
04753278	231
bfc8c901 VD	232	void get_online_mems(void);
bfc8c901 VD	233	void put_online_mems(void);
20d6c96b	234
30467e0b DR	235	void mem_hotplug_begin(void);
	236	void mem_hotplug_done(void);
	237
208d54e5	238	#else /* ! CONFIG_MEMORY_HOTPLUG */
2d070eab MH	239	#define pfn_to_online_page(pfn) \
	240	({ \
	241	struct page *___page = NULL; \
	242	if (pfn_valid(pfn)) \
	243	___page = pfn_to_page(pfn); \
	244	___page; \
	245	})
	246
bdc8cb98 DH	247	static inline unsigned zone_span_seqbegin(struct zone *zone)
	248	{
	249	return 0;
	250	}
	251	static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
	252	{
	253	return 0;
	254	}
	255	static inline void zone_span_writelock(struct zone *zone) {}
	256	static inline void zone_span_writeunlock(struct zone *zone) {}
	257	static inline void zone_seqlock_init(struct zone *zone) {}
3947be19 DH	258
	259	static inline int mhp_notimplemented(const char *func)
	260	{
	261	printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
	262	dump_stack();
	263	return -ENOSYS;
	264	}
	265
04753278 YG	266	static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
	267	{
	268	}
	269
01b0f197 TK	270	static inline int try_online_node(int nid)
	271	{
	272	return 0;
	273	}
	274
bfc8c901 VD	275	static inline void get_online_mems(void) {}
bfc8c901 VD	276	static inline void put_online_mems(void) {}
20d6c96b	277
30467e0b DR	278	static inline void mem_hotplug_begin(void) {}
	279	static inline void mem_hotplug_done(void) {}
	280
4932381e MH	281	static inline bool movable_node_is_enabled(void)
	282	{
	283	return false;
	284	}
bdc8cb98	285	#endif /* ! CONFIG_MEMORY_HOTPLUG */
9d99aaa3	286
3a2d7fa8 PT	287	#if defined(CONFIG_MEMORY_HOTPLUG) \|\| defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
	288	/*
	289	* pgdat resizing functions
	290	*/
	291	static inline
	292	void pgdat_resize_lock(struct pglist_data pgdat, unsigned long flags)
	293	{
	294	spin_lock_irqsave(&pgdat->node_size_lock, *flags);
	295	}
	296	static inline
	297	void pgdat_resize_unlock(struct pglist_data pgdat, unsigned long flags)
	298	{
	299	spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
	300	}
	301	static inline
	302	void pgdat_resize_init(struct pglist_data *pgdat)
	303	{
	304	spin_lock_init(&pgdat->node_size_lock);
	305	}
	306	#else /* !(CONFIG_MEMORY_HOTPLUG \|\| CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
	307	/*
	308	* Stub functions for when hotplug is off
	309	*/
	310	static inline void pgdat_resize_lock(struct pglist_data p, unsigned long f) {}
	311	static inline void pgdat_resize_unlock(struct pglist_data p, unsigned long f) {}
	312	static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
	313	#endif /* !(CONFIG_MEMORY_HOTPLUG \|\| CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
	314
5c755e9f BP	315	#ifdef CONFIG_MEMORY_HOTREMOVE
5c755e9f BP	316
90b30cdc	317	extern void try_offline_node(int nid);
aba6efc4	318	extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
eca499ab	319	extern int remove_memory(int nid, u64 start, u64 size);
d15e5926	320	extern void __remove_memory(int nid, u64 start, u64 size);
08b3acd7	321	extern int offline_and_remove_memory(int nid, u64 start, u64 size);
5c755e9f BP	322
5c755e9f BP	323	#else
90b30cdc	324	static inline void try_offline_node(int nid) {}
aba6efc4 RW	325
	326	static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
	327	{
	328	return -EINVAL;
	329	}
	330
eca499ab PT	331	static inline int remove_memory(int nid, u64 start, u64 size)
	332	{
	333	return -EBUSY;
	334	}
	335
d15e5926	336	static inline void __remove_memory(int nid, u64 start, u64 size) {}
5c755e9f BP	337	#endif /* CONFIG_MEMORY_HOTREMOVE */
5c755e9f BP	338
aba9817d BDC	339	extern void set_zone_contiguous(struct zone *zone);
	340	extern void clear_zone_contiguous(struct zone *zone);
	341
03e85f9d	342	extern void __ref free_area_init_core_hotplug(int nid);
8df1d0e4	343	extern int __add_memory(int nid, u64 start, u64 size);
bc02af93	344	extern int add_memory(int nid, u64 start, u64 size);
f29d8e9c	345	extern int add_memory_resource(int nid, struct resource *resource);
7b7b2721 DH	346	extern int add_memory_driver_managed(int nid, u64 start, u64 size,
7b7b2721 DH	347	const char *resource_name);
f1dd2cd1	348	extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
a99583e7	349	unsigned long nr_pages, struct vmem_altmap *altmap);
feee6b29 DH	350	extern void remove_pfn_range_from_zone(struct zone *zone,
	351	unsigned long start_pfn,
	352	unsigned long nr_pages);
6677e3ea	353	extern bool is_memblock_offlined(struct memory_block *mem);
7ea62160 DW	354	extern int sparse_add_section(int nid, unsigned long pfn,
7ea62160 DW	355	unsigned long nr_pages, struct vmem_altmap *altmap);
ba72b4c8	356	extern void sparse_remove_section(struct mem_section *ms,
7ea62160	357	unsigned long pfn, unsigned long nr_pages,
24b6d416	358	unsigned long map_offset, struct vmem_altmap *altmap);
04753278 YG	359	extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
04753278 YG	360	unsigned long pnum);
f1dd2cd1 MH	361	extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
f1dd2cd1 MH	362	int online_type);
e5e68930	363	extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
c246a213	364	unsigned long nr_pages);
208d54e5	365	#endif /* __LINUX_MEMORY_HOTPLUG_H */