fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / include / linux / memory_hotplug.h

diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 968b1aa..7b54666 100644 (file)
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -58,13 +58,81 @@ 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);
+
+#ifdef CONFIG_NUMA
+extern int memory_add_physaddr_to_nid(u64 start);
+#else
+static inline int memory_add_physaddr_to_nid(u64 start)
+{
+       return 0;
+}
+#endif
+
+#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
+/*
+ * For supporting node-hotadd, we have to allocate a new pgdat.
+ *
+ * If an arch has generic style NODE_DATA(),
+ * node_data[nid] = kzalloc() works well. But it depends on the architecture.
+ *
+ * In general, generic_alloc_nodedata() is used.
+ * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
+ *
+ */
+extern pg_data_t *arch_alloc_nodedata(int nid);
+extern void arch_free_nodedata(pg_data_t *pgdat);
+extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
+
+#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
+
+#define arch_alloc_nodedata(nid)       generic_alloc_nodedata(nid)
+#define arch_free_nodedata(pgdat)      generic_free_nodedata(pgdat)
+
+#ifdef CONFIG_NUMA
+/*
+ * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
+ * XXX: kmalloc_node() can't work well to get new node's memory at this time.
+ *     Because, pgdat for the new node is not allocated/initialized yet itself.
+ *     To use new node's memory, more consideration will be necessary.
+ */
+#define generic_alloc_nodedata(nid)                            \
+({                                                             \
+       kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
+})
+/*
+ * This definition is just for error path in node hotadd.
+ * For node hotremove, we have to replace this.
+ */
+#define generic_free_nodedata(pgdat)   kfree(pgdat)
+
+extern pg_data_t *node_data[];
+static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
+{
+       node_data[nid] = pgdat;
+}
+
+#else /* !CONFIG_NUMA */
+
+/* never called */
+static inline pg_data_t *generic_alloc_nodedata(int nid)
+{
+       BUG();
+       return NULL;
+}
+static inline void generic_free_nodedata(pg_data_t *pgdat)
+{
+}
+static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
+{
+}
+#endif /* CONFIG_NUMA */
+#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
+
 #else /* ! CONFIG_MEMORY_HOTPLUG */
 /*
  * Stub functions for when hotplug is off
@@ -92,11 +160,6 @@ static inline int mhp_notimplemented(const char *func)
        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)
@@ -105,4 +168,11 @@ static inline int __remove_pages(struct zone *zone, unsigned long start_pfn,
        dump_stack();
        return -ENOSYS;
 }
+
+extern int add_memory(int nid, u64 start, u64 size);
+extern int arch_add_memory(int nid, u64 start, u64 size);
+extern int remove_memory(u64 start, u64 size);
+extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
+                                                               int nr_pages);
+
 #endif /* __LINUX_MEMORY_HOTPLUG_H */