Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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
9#ifdef CONFIG_MEMORY_HOTPLUG
10/*
11 * pgdat resizing functions
12 */
13static inline
14void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
15{
16 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
17}
18static inline
19void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
20{
21 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
22}
23static inline
24void pgdat_resize_init(struct pglist_data *pgdat)
25{
26 spin_lock_init(&pgdat->node_size_lock);
27}
28/*
29 * Zone resizing functions
30 */
31static inline unsigned zone_span_seqbegin(struct zone *zone)
32{
33 return read_seqbegin(&zone->span_seqlock);
34}
35static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
36{
37 return read_seqretry(&zone->span_seqlock, iv);
38}
39static inline void zone_span_writelock(struct zone *zone)
40{
41 write_seqlock(&zone->span_seqlock);
42}
43static inline void zone_span_writeunlock(struct zone *zone)
44{
45 write_sequnlock(&zone->span_seqlock);
46}
47static inline void zone_seqlock_init(struct zone *zone)
48{
49 seqlock_init(&zone->span_seqlock);
50}
51extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
52extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
53extern 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 */
55extern void online_page(struct page *page);
56/* VM interface that may be used by firmware interface */
57extern int add_memory(u64 start, u64 size);
58extern int remove_memory(u64 start, u64 size);
59extern int online_pages(unsigned long, unsigned long);
60
61/* reasonably generic interface to expand the physical pages in a zone */
62extern 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 */
68static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
69static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
70static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
71
72static inline unsigned zone_span_seqbegin(struct zone *zone)
73{
74 return 0;
75}
76static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
77{
78 return 0;
79}
80static inline void zone_span_writelock(struct zone *zone) {}
81static inline void zone_span_writeunlock(struct zone *zone) {}
82static inline void zone_seqlock_init(struct zone *zone) {}
83
84static 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
91static 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 */
97static 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 */