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| author | Dave Hansen <haveblue@us.ibm.com> | 2005-10-29 18:16:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-29 21:40:44 -0700 |
| commit | 3947be1969a9ce455ec30f60ef51efb10e4323d1 (patch) | |
| tree | 0b4b3b4c268beb7aa88cb685cce48b6bb5053c47 /include/linux/memory_hotplug.h | |
| parent | bdc8cb984576ab5b550c8b24c6fa111a873503e3 (diff) | |
| download | lwn-3947be1969a9ce455ec30f60ef51efb10e4323d1.tar.gz lwn-3947be1969a9ce455ec30f60ef51efb10e4323d1.zip | |
[PATCH] memory hotplug: sysfs and add/remove functions
This adds generic memory add/remove and supporting functions for memory
hotplug into a new file as well as a memory hotplug kernel config option.
Individual architecture patches will follow.
For now, disable memory hotplug when swsusp is enabled. There's a lot of
churn there right now. We'll fix it up properly once it calms down.
Signed-off-by: Matt Tolentino <matthew.e.tolentino@intel.com>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/memory_hotplug.h')
| -rw-r--r-- | include/linux/memory_hotplug.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 4b08bc947578..01f03bc06eff 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -3,6 +3,8 @@ #include <linux/mmzone.h> #include <linux/spinlock.h> +#include <linux/mmzone.h> +#include <linux/notifier.h> #ifdef CONFIG_MEMORY_HOTPLUG /* @@ -46,6 +48,19 @@ static inline void zone_seqlock_init(struct zone *zone) { seqlock_init(&zone->span_seqlock); } +extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); +extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); +extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); +/* need some defines for these for archs that don't support it */ +extern void online_page(struct page *page); +/* VM interface that may be used by firmware interface */ +extern int add_memory(u64 start, u64 size); +extern int remove_memory(u64 start, u64 size); +extern int online_pages(unsigned long, unsigned long); + +/* reasonably generic interface to expand the physical pages in a zone */ +extern int __add_pages(struct zone *zone, unsigned long start_pfn, + unsigned long nr_pages); #else /* ! CONFIG_MEMORY_HOTPLUG */ /* * Stub functions for when hotplug is off @@ -65,5 +80,25 @@ static inline int zone_span_seqretry(struct zone *zone, unsigned iv) static inline void zone_span_writelock(struct zone *zone) {} static inline void zone_span_writeunlock(struct zone *zone) {} static inline void zone_seqlock_init(struct zone *zone) {} + +static inline int mhp_notimplemented(const char *func) +{ + printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); + dump_stack(); + return -ENOSYS; +} + +static inline int __add_pages(struct zone *zone, unsigned long start_pfn, + unsigned long nr_pages) +{ + return mhp_notimplemented(__FUNCTION__); +} #endif /* ! CONFIG_MEMORY_HOTPLUG */ +static inline int __remove_pages(struct zone *zone, unsigned long start_pfn, + unsigned long nr_pages) +{ + printk(KERN_WARNING "%s() called, not yet supported\n", __FUNCTION__); + dump_stack(); + return -ENOSYS; +} #endif /* __LINUX_MEMORY_HOTPLUG_H */ |