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     ˆÂÄ361ÁÀÆ i    /* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ROOT_DEV_H_
#define _ROOT_DEV_H_

#include <linux/major.h>
#include <linux/types.h>
#include <linux/kdev_t.h>

enum {
	Root_NFS = MKDEV(UNNAMED_MAJOR, 255),
	Root_CIFS = MKDEV(UNNAMED_MAJOR, 254),
	Root_Generic = MKDEV(UNNAMED_MAJOR, 253),
	Root_RAM0 = MKDEV(RAMDISK_MAJOR, 0),
};

extern dev_t ROOT_DEV;

#endif
     ˆÂÄ„„Ó_ÁÀÆ /Ô    /* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_MEMORY_HOTPLUG_H
#define __LINUX_MEMORY_HOTPLUG_H

#include <linux/mmzone.h>
#include <linux/spinlock.h>
#include <linux/notifier.h>
#include <linux/bug.h>

struct page;
struct zone;
struct pglist_data;
struct mem_section;
struct memory_group;
struct resource;
struct vmem_altmap;
struct dev_pagemap;

#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.
 *
 */
extern pg_data_t *arch_alloc_nodedata(int nid);
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)

#ifdef CONFIG_NUMA
/*
 * XXX: node aware allocation 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)				\
({								\
	memblock_alloc(sizeof(*pgdat), SMP_CACHE_BYTES);	\
})

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 arch_refresh_nodedata(int nid, pg_data_t *pgdat)
{
}
#endif /* CONFIG_NUMA */
#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */

#ifdef CONFIG_MEMORY_HOTPLUG
struct page *pfn_to_online_page(unsigned long pfn);

/* Types for control the zone type of onlined and offlined memory */
enum {
	/* Offline the memory. */
	MMOP_OFFLINE = 0,
	/* Online the memory. Zone depends, see default_zone_for_pfn(). */
	MMOP_ONLINE,
	/* Online the memory to ZONE_NORMAL. */
	MMOP_ONLINE_KERNEL,
	/* Online the memory to ZONE_MOVABLE. */
	MMOP_ONLINE_MOVABLE,
};

/* Flags for add_memory() and friends to specify memory hotplug details. */
typedef int __bitwise mhp_t;

/* No special request */
#define MHP_NONE		((__force mhp_t)0)
/*
 * Allow merging of the added System RAM resource with adjacent,
 * mergeable resources. After a successful call to add_memory_resource()
 * with this flag set, the resource pointer must no longer be used as it
 * might be stale, or the resource might have changed.
 */
#define MHP_MERGE_RESOURCE	((__force mhp_t)BIT(0))

/*
 * We want memmap (struct page array) to be self contained.
 * To do so, we will use the beginning of the hot-added range to build
 * the page tables for the memmap array that describes the entire range.
 * Only selected architectures support it with SPARSE_VMEMMAP.
 * This is only a hint, the core kernel can decide to not do this based on
 * different alignment checks.
 */
#define MHP_MEMMAP_ON_MEMORY   ((__force mhp_t)BIT(1))
/*
 * The nid field specifies a memory group id (mgid) instead. The memory group
 * implies the node id (nid).
 */
#define MHP_NID_IS_MGID		((__force mhp_t)BIT(2))
/*
 * The hotplugged memory is completely inaccessible while the memory is
 * offline. The memory provider will handle MEM_PREPARE_ONLINE /
 * MEM_FINISH_OFFLINE notifications and make the memory accessible.
 *
 * This flag is only relevant when used along with MHP_MEMMAP_ON_MEMORY,
 * because the altmap cannot be written (e.g., poisoned) when adding
 * memory -- before it is set online.
 *
 * This allows for adding memory with an altmap that is not currently
 * made available by a hypervisor. When onlining that me