v4.19.13 snapshot.
diff --git a/include/linux/memory.h b/include/linux/memory.h
new file mode 100644
index 0000000..a6ddefc
--- /dev/null
+++ b/include/linux/memory.h
@@ -0,0 +1,148 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * include/linux/memory.h - generic memory definition
+ *
+ * This is mainly for topological representation. We define the
+ * basic "struct memory_block" here, which can be embedded in per-arch
+ * definitions or NUMA information.
+ *
+ * Basic handling of the devices is done in drivers/base/memory.c
+ * and system devices are handled in drivers/base/sys.c.
+ *
+ * Memory block are exported via sysfs in the class/memory/devices/
+ * directory.
+ *
+ */
+#ifndef _LINUX_MEMORY_H_
+#define _LINUX_MEMORY_H_
+
+#include <linux/node.h>
+#include <linux/compiler.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+
+#define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS)
+
+struct memory_block {
+ unsigned long start_section_nr;
+ unsigned long end_section_nr;
+ unsigned long state; /* serialized by the dev->lock */
+ int section_count; /* serialized by mem_sysfs_mutex */
+ int online_type; /* for passing data to online routine */
+ int phys_device; /* to which fru does this belong? */
+ void *hw; /* optional pointer to fw/hw data */
+ int (*phys_callback)(struct memory_block *);
+ struct device dev;
+ int nid; /* NID for this memory block */
+};
+
+int arch_get_memory_phys_device(unsigned long start_pfn);
+unsigned long memory_block_size_bytes(void);
+int set_memory_block_size_order(unsigned int order);
+
+/* These states are exposed to userspace as text strings in sysfs */
+#define MEM_ONLINE (1<<0) /* exposed to userspace */
+#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
+#define MEM_OFFLINE (1<<2) /* exposed to userspace */
+#define MEM_GOING_ONLINE (1<<3)
+#define MEM_CANCEL_ONLINE (1<<4)
+#define MEM_CANCEL_OFFLINE (1<<5)
+
+struct memory_notify {
+ unsigned long start_pfn;
+ unsigned long nr_pages;
+ int status_change_nid_normal;
+ int status_change_nid_high;
+ int status_change_nid;
+};
+
+/*
+ * During pageblock isolation, count the number of pages within the
+ * range [start_pfn, start_pfn + nr_pages) which are owned by code
+ * in the notifier chain.
+ */
+#define MEM_ISOLATE_COUNT (1<<0)
+
+struct memory_isolate_notify {
+ unsigned long start_pfn; /* Start of range to check */
+ unsigned int nr_pages; /* # pages in range to check */
+ unsigned int pages_found; /* # pages owned found by callbacks */
+};
+
+struct notifier_block;
+struct mem_section;
+
+/*
+ * Priorities for the hotplug memory callback routines (stored in decreasing
+ * order in the callback chain)
+ */
+#define SLAB_CALLBACK_PRI 1
+#define IPC_CALLBACK_PRI 10
+
+#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
+static inline int memory_dev_init(void)
+{
+ return 0;
+}
+static inline int register_memory_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+static inline void unregister_memory_notifier(struct notifier_block *nb)
+{
+}
+static inline int memory_notify(unsigned long val, void *v)
+{
+ return 0;
+}
+static inline int register_memory_isolate_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
+{
+}
+static inline int memory_isolate_notify(unsigned long val, void *v)
+{
+ return 0;
+}
+#else
+extern int register_memory_notifier(struct notifier_block *nb);
+extern void unregister_memory_notifier(struct notifier_block *nb);
+extern int register_memory_isolate_notifier(struct notifier_block *nb);
+extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
+int hotplug_memory_register(int nid, struct mem_section *section);
+#ifdef CONFIG_MEMORY_HOTREMOVE
+extern int unregister_memory_section(struct mem_section *);
+#endif
+extern int memory_dev_init(void);
+extern int memory_notify(unsigned long val, void *v);
+extern int memory_isolate_notify(unsigned long val, void *v);
+extern struct memory_block *find_memory_block_hinted(struct mem_section *,
+ struct memory_block *);
+extern struct memory_block *find_memory_block(struct mem_section *);
+#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
+#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+#define hotplug_memory_notifier(fn, pri) ({ \
+ static __meminitdata struct notifier_block fn##_mem_nb =\
+ { .notifier_call = fn, .priority = pri };\
+ register_memory_notifier(&fn##_mem_nb); \
+})
+#define register_hotmemory_notifier(nb) register_memory_notifier(nb)
+#define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb)
+#else
+#define hotplug_memory_notifier(fn, pri) ({ 0; })
+/* These aren't inline functions due to a GCC bug. */
+#define register_hotmemory_notifier(nb) ({ (void)(nb); 0; })
+#define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
+#endif
+
+/*
+ * Kernel text modification mutex, used for code patching. Users of this lock
+ * can sleep.
+ */
+extern struct mutex text_mutex;
+
+#endif /* _LINUX_MEMORY_H_ */