Linux kernel mirror (for testing)
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linux
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
9struct page;
10struct zone;
11struct pglist_data;
12
13#ifdef CONFIG_MEMORY_HOTPLUG
14/*
15 * pgdat resizing functions
16 */
17static inline
18void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
19{
20 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
21}
22static inline
23void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
24{
25 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
26}
27static inline
28void pgdat_resize_init(struct pglist_data *pgdat)
29{
30 spin_lock_init(&pgdat->node_size_lock);
31}
32/*
33 * Zone resizing functions
34 */
35static inline unsigned zone_span_seqbegin(struct zone *zone)
36{
37 return read_seqbegin(&zone->span_seqlock);
38}
39static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
40{
41 return read_seqretry(&zone->span_seqlock, iv);
42}
43static inline void zone_span_writelock(struct zone *zone)
44{
45 write_seqlock(&zone->span_seqlock);
46}
47static inline void zone_span_writeunlock(struct zone *zone)
48{
49 write_sequnlock(&zone->span_seqlock);
50}
51static inline void zone_seqlock_init(struct zone *zone)
52{
53 seqlock_init(&zone->span_seqlock);
54}
55extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
56extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
57extern 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 */
59extern void online_page(struct page *page);
60/* VM interface that may be used by firmware interface */
61extern int add_memory(u64 start, u64 size);
62extern int remove_memory(u64 start, u64 size);
63extern int online_pages(unsigned long, unsigned long);
64
65/* reasonably generic interface to expand the physical pages in a zone */
66extern 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 */
72static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
73static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
74static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
75
76static inline unsigned zone_span_seqbegin(struct zone *zone)
77{
78 return 0;
79}
80static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
81{
82 return 0;
83}
84static inline void zone_span_writelock(struct zone *zone) {}
85static inline void zone_span_writeunlock(struct zone *zone) {}
86static inline void zone_seqlock_init(struct zone *zone) {}
87
88static 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
95static 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 */
101static 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 */