[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 ___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,
};

/*
 * 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 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;				\
 })

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, 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 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
bdc8cb98 DH	54	/*
bdc8cb98 DH	55	* Zone resizing functions
511c2aba LJ	56	*
	57	* Note: any attempt to resize a zone should has pgdat_resize_lock()
	58	* zone_span_writelock() both held. This ensure the size of a zone
	59	* can't be changed while pgdat_resize_lock() held.
bdc8cb98 DH	60	*/
	61	static inline unsigned zone_span_seqbegin(struct zone *zone)
	62	{
	63	return read_seqbegin(&zone->span_seqlock);
	64	}
	65	static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
	66	{
	67	return read_seqretry(&zone->span_seqlock, iv);
	68	}
	69	static inline void zone_span_writelock(struct zone *zone)
	70	{
	71	write_seqlock(&zone->span_seqlock);
	72	}
	73	static inline void zone_span_writeunlock(struct zone *zone)
	74	{
	75	write_sequnlock(&zone->span_seqlock);
	76	}
	77	static inline void zone_seqlock_init(struct zone *zone)
	78	{
	79	seqlock_init(&zone->span_seqlock);
	80	}
3947be19 DH	81	extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
	82	extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
	83	extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
3947be19	84	/* VM interface that may be used by firmware interface */
511c2aba	85	extern int online_pages(unsigned long, unsigned long, int);
a96dfddb TK	86	extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
a96dfddb TK	87	unsigned long valid_start, unsigned long valid_end);
0c0e6195	88	extern void __offline_isolated_pages(unsigned long, unsigned long);
48e94196	89
9d0ad8ca DK	90	typedef void (online_page_callback_t)(struct page page);
	91
	92	extern int set_online_page_callback(online_page_callback_t callback);
	93	extern int restore_online_page_callback(online_page_callback_t callback);
	94
	95	extern void __online_page_set_limits(struct page *page);
	96	extern void __online_page_increment_counters(struct page *page);
	97	extern void __online_page_free(struct page *page);
	98
01b0f197 TK	99	extern int try_online_node(int nid);
01b0f197 TK	100
31bc3858	101	extern bool memhp_auto_online;
4932381e MH	102	/* If movable_node boot option specified */
	103	extern bool movable_node_enabled;
	104	static inline bool movable_node_is_enabled(void)
	105	{
	106	return movable_node_enabled;
	107	}
31bc3858	108
49ac8255	109	#ifdef CONFIG_MEMORY_HOTREMOVE
da024512 CH	110	extern int arch_remove_memory(u64 start, u64 size,
da024512 CH	111	struct vmem_altmap *altmap);
4edd7cef	112	extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
da024512	113	unsigned long nr_pages, struct vmem_altmap *altmap);
49ac8255 KH	114	#endif /* CONFIG_MEMORY_HOTREMOVE */
49ac8255 KH	115
f1dd2cd1	116	/* reasonably generic interface to expand the physical pages */
24e6d5a5 CH	117	extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
24e6d5a5 CH	118	struct vmem_altmap *altmap, bool want_memblock);
bc02af93	119
3072e413 MH	120	#ifndef CONFIG_ARCH_HAS_ADD_PAGES
3072e413 MH	121	static inline int add_pages(int nid, unsigned long start_pfn,
24e6d5a5 CH	122	unsigned long nr_pages, struct vmem_altmap *altmap,
24e6d5a5 CH	123	bool want_memblock)
3072e413	124	{
24e6d5a5	125	return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
3072e413 MH	126	}
3072e413 MH	127	#else /* ARCH_HAS_ADD_PAGES */
24e6d5a5 CH	128	int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
24e6d5a5 CH	129	struct vmem_altmap *altmap, bool want_memblock);
3072e413 MH	130	#endif /* ARCH_HAS_ADD_PAGES */
3072e413 MH	131
bc02af93 YG	132	#ifdef CONFIG_NUMA
	133	extern int memory_add_physaddr_to_nid(u64 start);
	134	#else
	135	static inline int memory_add_physaddr_to_nid(u64 start)
	136	{
	137	return 0;
	138	}
	139	#endif
	140
306d6cbe YG	141	#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
	142	/*
	143	* For supporting node-hotadd, we have to allocate a new pgdat.
	144	*
	145	* If an arch has generic style NODE_DATA(),
	146	* node_data[nid] = kzalloc() works well. But it depends on the architecture.
	147	*
	148	* In general, generic_alloc_nodedata() is used.
	149	* Now, arch_free_nodedata() is just defined for error path of node_hot_add.
	150	*
	151	*/
dd0932d9 YG	152	extern pg_data_t *arch_alloc_nodedata(int nid);
dd0932d9 YG	153	extern void arch_free_nodedata(pg_data_t *pgdat);
7049027c	154	extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
306d6cbe YG	155
	156	#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	157
	158	#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
	159	#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
	160
	161	#ifdef CONFIG_NUMA
	162	/*
	163	* If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
	164	* XXX: kmalloc_node() can't work well to get new node's memory at this time.
	165	* Because, pgdat for the new node is not allocated/initialized yet itself.
	166	* To use new node's memory, more consideration will be necessary.
	167	*/
	168	#define generic_alloc_nodedata(nid) \
	169	({ \
	170	kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
	171	})
	172	/*
	173	* This definition is just for error path in node hotadd.
	174	* For node hotremove, we have to replace this.
	175	*/
	176	#define generic_free_nodedata(pgdat) kfree(pgdat)
	177
10ad400b YG	178	extern pg_data_t *node_data[];
	179	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	180	{
	181	node_data[nid] = pgdat;
	182	}
	183
306d6cbe YG	184	#else /* !CONFIG_NUMA */
	185
	186	/* never called */
	187	static inline pg_data_t *generic_alloc_nodedata(int nid)
	188	{
	189	BUG();
	190	return NULL;
	191	}
	192	static inline void generic_free_nodedata(pg_data_t *pgdat)
	193	{
	194	}
10ad400b YG	195	static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
	196	{
	197	}
306d6cbe YG	198	#endif /* CONFIG_NUMA */
	199	#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
	200
46723bfa	201	#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
7ded384a	202	extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
46723bfa	203	#else
04753278 YG	204	static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
	205	{
	206	}
04753278	207	#endif
46723bfa YI	208	extern void put_page_bootmem(struct page *page);
	209	extern void get_page_bootmem(unsigned long ingo, struct page *page,
	210	unsigned long type);
04753278	211
bfc8c901 VD	212	void get_online_mems(void);
bfc8c901 VD	213	void put_online_mems(void);
20d6c96b	214
30467e0b DR	215	void mem_hotplug_begin(void);
	216	void mem_hotplug_done(void);
	217
d883c6cf JK	218	extern void set_zone_contiguous(struct zone *zone);
	219	extern void clear_zone_contiguous(struct zone *zone);
	220
208d54e5	221	#else /* ! CONFIG_MEMORY_HOTPLUG */
2d070eab MH	222	#define pfn_to_online_page(pfn) \
	223	({ \
	224	struct page *___page = NULL; \
	225	if (pfn_valid(pfn)) \
	226	___page = pfn_to_page(pfn); \
	227	___page; \
	228	})
	229
bdc8cb98 DH	230	static inline unsigned zone_span_seqbegin(struct zone *zone)
	231	{
	232	return 0;
	233	}
	234	static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
	235	{
	236	return 0;
	237	}
	238	static inline void zone_span_writelock(struct zone *zone) {}
	239	static inline void zone_span_writeunlock(struct zone *zone) {}
	240	static inline void zone_seqlock_init(struct zone *zone) {}
3947be19 DH	241
	242	static inline int mhp_notimplemented(const char *func)
	243	{
	244	printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
	245	dump_stack();
	246	return -ENOSYS;
	247	}
	248
04753278 YG	249	static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
	250	{
	251	}
	252
01b0f197 TK	253	static inline int try_online_node(int nid)
	254	{
	255	return 0;
	256	}
	257
bfc8c901 VD	258	static inline void get_online_mems(void) {}
bfc8c901 VD	259	static inline void put_online_mems(void) {}
20d6c96b	260
30467e0b DR	261	static inline void mem_hotplug_begin(void) {}
	262	static inline void mem_hotplug_done(void) {}
	263
4932381e MH	264	static inline bool movable_node_is_enabled(void)
	265	{
	266	return false;
	267	}
bdc8cb98	268	#endif /* ! CONFIG_MEMORY_HOTPLUG */
9d99aaa3	269
3a2d7fa8 PT	270	#if defined(CONFIG_MEMORY_HOTPLUG) \|\| defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
	271	/*
	272	* pgdat resizing functions
	273	*/
	274	static inline
	275	void pgdat_resize_lock(struct pglist_data pgdat, unsigned long flags)
	276	{
	277	spin_lock_irqsave(&pgdat->node_size_lock, *flags);
	278	}
	279	static inline
	280	void pgdat_resize_unlock(struct pglist_data pgdat, unsigned long flags)
	281	{
	282	spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
	283	}
	284	static inline
	285	void pgdat_resize_init(struct pglist_data *pgdat)
	286	{
	287	spin_lock_init(&pgdat->node_size_lock);
	288	}
	289	#else /* !(CONFIG_MEMORY_HOTPLUG \|\| CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
	290	/*
	291	* Stub functions for when hotplug is off
	292	*/
	293	static inline void pgdat_resize_lock(struct pglist_data p, unsigned long f) {}
	294	static inline void pgdat_resize_unlock(struct pglist_data p, unsigned long f) {}
	295	static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
	296	#endif /* !(CONFIG_MEMORY_HOTPLUG \|\| CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
	297
5c755e9f BP	298	#ifdef CONFIG_MEMORY_HOTREMOVE
5c755e9f BP	299
c98940f6	300	extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
90b30cdc	301	extern void try_offline_node(int nid);
aba6efc4 RW	302	extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
aba6efc4 RW	303	extern void remove_memory(int nid, u64 start, u64 size);
d15e5926	304	extern void __remove_memory(int nid, u64 start, u64 size);
5c755e9f BP	305
5c755e9f BP	306	#else
c98940f6	307	static inline bool is_mem_section_removable(unsigned long pfn,
5c755e9f BP	308	unsigned long nr_pages)
5c755e9f BP	309	{
c98940f6	310	return false;
5c755e9f	311	}
90b30cdc WC	312
90b30cdc WC	313	static inline void try_offline_node(int nid) {}
aba6efc4 RW	314
	315	static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
	316	{
	317	return -EINVAL;
	318	}
	319
	320	static inline void remove_memory(int nid, u64 start, u64 size) {}
d15e5926	321	static inline void __remove_memory(int nid, u64 start, u64 size) {}
5c755e9f BP	322	#endif /* CONFIG_MEMORY_HOTREMOVE */
5c755e9f BP	323
03e85f9d	324	extern void __ref free_area_init_core_hotplug(int nid);
e2ff3940 RW	325	extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
e2ff3940 RW	326	void arg, int (func)(struct memory_block , void ));
8df1d0e4	327	extern int __add_memory(int nid, u64 start, u64 size);
bc02af93	328	extern int add_memory(int nid, u64 start, u64 size);
31bc3858	329	extern int add_memory_resource(int nid, struct resource *resource, bool online);
24e6d5a5 CH	330	extern int arch_add_memory(int nid, u64 start, u64 size,
24e6d5a5 CH	331	struct vmem_altmap *altmap, bool want_memblock);
f1dd2cd1	332	extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
a99583e7	333	unsigned long nr_pages, struct vmem_altmap *altmap);
a16cee10	334	extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
6677e3ea	335	extern bool is_memblock_offlined(struct memory_block *mem);
7b73d978 CH	336	extern int sparse_add_one_section(struct pglist_data *pgdat,
7b73d978 CH	337	unsigned long start_pfn, struct vmem_altmap *altmap);
4b94ffdc	338	extern void sparse_remove_one_section(struct zone zone, struct mem_section ms,
24b6d416	339	unsigned long map_offset, struct vmem_altmap *altmap);
04753278 YG	340	extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
04753278 YG	341	unsigned long pnum);
f1dd2cd1 MH	342	extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
f1dd2cd1 MH	343	int online_type);
e5e68930	344	extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
c246a213	345	unsigned long nr_pages);
208d54e5	346	#endif /* __LINUX_MEMORY_HOTPLUG_H */