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 add_memory(u64 start, u64 size);
  62 extern int remove_memory(u64 start, u64 size);
  63 extern int online_pages(unsigned long, unsigned long);
  64
  65 /* reasonably generic interface to expand the physical pages in a zone  */
  66 extern int __add_pages(struct zone *zone, unsigned long start_pfn,
  67         unsigned long nr_pages);
  68 #else /* ! CONFIG_MEMORY_HOTPLUG */
  69 /*
  70  * Stub functions for when hotplug is off
  71  */
  72 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
  73 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
  74 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
  75
  76 static inline unsigned zone_span_seqbegin(struct zone *zone)
  77 {
  78         return 0;
  79 }
  80 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
  81 {
  82         return 0;
  83 }
  84 static inline void zone_span_writelock(struct zone *zone) {}
  85 static inline void zone_span_writeunlock(struct zone *zone) {}
  86 static inline void zone_seqlock_init(struct zone *zone) {}
  87
  88 static inline int mhp_notimplemented(const char *func)
  89 {
  90         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
  91         dump_stack();
  92         return -ENOSYS;
  93 }
  94
  95 static inline int __add_pages(struct zone *zone, unsigned long start_pfn,
  96         unsigned long nr_pages)
  97 {
  98         return mhp_notimplemented(__FUNCTION__);
  99 }
 100 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 101 static inline int __remove_pages(struct zone *zone, unsigned long start_pfn,
 102         unsigned long nr_pages)
 103 {
 104         printk(KERN_WARNING "%s() called, not yet supported\n", __FUNCTION__);
 105         dump_stack();
 106         return -ENOSYS;
 107 }
 108 #endif /* __LINUX_MEMORY_HOTPLUG_H */