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#ifndef __LINUX_MEMORY_HOTPLUG_H

#define __LINUX_MEMORY_HOTPLUG_H

#include <linux/mmzone.h>

#include <linux/spinlock.h>

#include <linux/notifier.h>

struct page;

struct zone;

struct pglist_data;

#ifdef CONFIG_MEMORY_HOTPLUG

/*

 * 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

 */

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);

/* need some defines for these for archs that don't support it */

extern void online_page(struct page *page);

/* VM interface that may be used by firmware interface */

extern int online_pages(unsigned long, unsigned long);

extern void __offline_isolated_pages(unsigned long, unsigned long);

extern int offline_pages(unsigned long, unsigned long, unsigned long);

/* reasonably generic interface to expand the physical pages in a zone  */

extern int __add_pages(struct zone *zone, unsigned long start_pfn,

        unsigned long nr_pages);

/*

 * Walk thorugh all memory which is registered as resource.

 * arg is (start_pfn, nr_pages, private_arg_pointer)

 */

extern int walk_memory_resource(unsigned long start_pfn,

                        unsigned long nr_pages, void *arg,

                        int (*func)(unsigned long, unsigned long, void *));

#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 */

#else /* ! CONFIG_MEMORY_HOTPLUG */

/*

 * 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;

}

#endif /* ! CONFIG_MEMORY_HOTPLUG */

extern int add_memory(int nid, u64 start, u64 size);

extern int arch_add_memory(int nid, u64 start, u64 size);

extern int remove_memory(u64 start, u64 size);

extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,

                                                                int nr_pages);

#endif /* __LINUX_MEMORY_HOTPLUG_H */