include/linux/memory_hotplug.h

   1 #ifndef __LINUX_MEMORY_HOTPLUG_H
   2 #define __LINUX_MEMORY_HOTPLUG_H
   3
   4 #include <linux/mmzone.h>
   5 #include <linux/spinlock.h>
   6 #include <linux/mmzone.h>
   7 #include <linux/notifier.h>
   8
   9 struct page;
  10 struct zone;
  11 struct pglist_data;
  12
  13 #ifdef CONFIG_MEMORY_HOTPLUG
  14 /*
  15  * pgdat resizing functions
  16  */
  17 static inline
  18 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
  19 {
  20         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
  21 }
  22 static inline
  23 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
  24 {
  25         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
  26 }
  27 static inline
  28 void pgdat_resize_init(struct pglist_data *pgdat)
  29 {
  30         spin_lock_init(&pgdat->node_size_lock);
  31 }
  32 /*
  33  * Zone resizing functions
  34  */
  35 static inline unsigned zone_span_seqbegin(struct zone *zone)
  36 {
  37         return read_seqbegin(&zone->span_seqlock);
  38 }
  39 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  40 {
  41         return read_seqretry(&zone->span_seqlock, iv);
  42 }
  43 static inline void zone_span_writelock(struct zone *zone)
  44 {
  45         write_seqlock(&zone->span_seqlock);
  46 }
  47 static inline void zone_span_writeunlock(struct zone *zone)
  48 {
  49         write_sequnlock(&zone->span_seqlock);
  50 }
  51 static inline void zone_seqlock_init(struct zone *zone)
  52 {
  53         seqlock_init(&zone->span_seqlock);
  54 }
  55 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
  56 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
  57 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
  58 /* need some defines for these for archs that don't support it */
  59 extern void online_page(struct page *page);
  60 /* VM interface that may be used by firmware interface */
  61 extern int online_pages(unsigned long, unsigned long);
  62
  63 /* reasonably generic interface to expand the physical pages in a zone  */
  64 extern int __add_pages(struct zone *zone, unsigned long start_pfn,
  65         unsigned long nr_pages);
  66 #else /* ! CONFIG_MEMORY_HOTPLUG */
  67 /*
  68  * Stub functions for when hotplug is off
  69  */
  70 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
  71 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
  72 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
  73
  74 static inline unsigned zone_span_seqbegin(struct zone *zone)
  75 {
  76         return 0;
  77 }
  78 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  79 {
  80         return 0;
  81 }
  82 static inline void zone_span_writelock(struct zone *zone) {}
  83 static inline void zone_span_writeunlock(struct zone *zone) {}
  84 static inline void zone_seqlock_init(struct zone *zone) {}
  85
  86 static inline int mhp_notimplemented(const char *func)
  87 {
  88         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
  89         dump_stack();
  90         return -ENOSYS;
  91 }
  92
  93 #endif /* ! CONFIG_MEMORY_HOTPLUG */
  94 static inline int __remove_pages(struct zone *zone, unsigned long start_pfn,
  95         unsigned long nr_pages)
  96 {
  97         printk(KERN_WARNING "%s() called, not yet supported\n", __FUNCTION__);
  98         dump_stack();
  99         return -ENOSYS;
 100 }
 101
 102 extern int add_memory(u64 start, u64 size);
 103 extern int remove_memory(u64 start, u64 size);
 104
 105 #endif /* __LINUX_MEMORY_HOTPLUG_H */