1 #ifndef __LINUX_MEMORY_HOTPLUG_H
2 #define __LINUX_MEMORY_HOTPLUG_H
4 #include <linux/mmzone.h>
5 #include <linux/spinlock.h>
6 #include <linux/mmzone.h>
7 #include <linux/notifier.h>
13 #ifdef CONFIG_MEMORY_HOTPLUG
15 * pgdat resizing functions
18 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
20 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
23 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
25 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
28 void pgdat_resize_init(struct pglist_data *pgdat)
30 spin_lock_init(&pgdat->node_size_lock);
33 * Zone resizing functions
35 static inline unsigned zone_span_seqbegin(struct zone *zone)
37 return read_seqbegin(&zone->span_seqlock);
39 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
41 return read_seqretry(&zone->span_seqlock, iv);
43 static inline void zone_span_writelock(struct zone *zone)
45 write_seqlock(&zone->span_seqlock);
47 static inline void zone_span_writeunlock(struct zone *zone)
49 write_sequnlock(&zone->span_seqlock);
51 static inline void zone_seqlock_init(struct zone *zone)
53 seqlock_init(&zone->span_seqlock);
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);
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);
68 extern int memory_add_physaddr_to_nid(u64 start);
70 static inline int memory_add_physaddr_to_nid(u64 start)
76 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
78 * For supporting node-hotadd, we have to allocate a new pgdat.
80 * If an arch has generic style NODE_DATA(),
81 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
83 * In general, generic_alloc_nodedata() is used.
84 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
87 static inline pg_data_t *arch_alloc_nodedata(int nid)
91 static inline void arch_free_nodedata(pg_data_t *pgdat)
94 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
98 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
100 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
101 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
105 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
106 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
107 * Because, pgdat for the new node is not allocated/initialized yet itself.
108 * To use new node's memory, more consideration will be necessary.
110 #define generic_alloc_nodedata(nid) \
112 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
115 * This definition is just for error path in node hotadd.
116 * For node hotremove, we have to replace this.
118 #define generic_free_nodedata(pgdat) kfree(pgdat)
120 extern pg_data_t *node_data[];
121 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
123 node_data[nid] = pgdat;
126 #else /* !CONFIG_NUMA */
129 static inline pg_data_t *generic_alloc_nodedata(int nid)
134 static inline void generic_free_nodedata(pg_data_t *pgdat)
137 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
140 #endif /* CONFIG_NUMA */
141 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
143 #else /* ! CONFIG_MEMORY_HOTPLUG */
145 * Stub functions for when hotplug is off
147 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
148 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
149 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
151 static inline unsigned zone_span_seqbegin(struct zone *zone)
155 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
159 static inline void zone_span_writelock(struct zone *zone) {}
160 static inline void zone_span_writeunlock(struct zone *zone) {}
161 static inline void zone_seqlock_init(struct zone *zone) {}
163 static inline int mhp_notimplemented(const char *func)
165 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
170 #endif /* ! CONFIG_MEMORY_HOTPLUG */
171 static inline int __remove_pages(struct zone *zone, unsigned long start_pfn,
172 unsigned long nr_pages)
174 printk(KERN_WARNING "%s() called, not yet supported\n", __FUNCTION__);
179 extern int add_memory(int nid, u64 start, u64 size);
180 extern int arch_add_memory(int nid, u64 start, u64 size);
181 extern int remove_memory(u64 start, u64 size);
183 #endif /* __LINUX_MEMORY_HOTPLUG_H */