[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>
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 4b08bc9..01f03bc 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 @@
{
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 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 */