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