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-rw-r--r--include/linux/memory_hotplug.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 29c1472efad0..c6fd2c0323fc 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -73,6 +73,61 @@ static inline int memory_add_physaddr_to_nid(u64 start)
}
#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.
+ *
+ */
+static inline pg_data_t *arch_alloc_nodedata(int nid)
+{
+ return NULL;
+}
+static inline void arch_free_nodedata(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)
+
+#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)
+{
+}
+#endif /* CONFIG_NUMA */
+#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
+
#else /* ! CONFIG_MEMORY_HOTPLUG */
/*
* Stub functions for when hotplug is off