[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / arch / sh / mm / init.c

/*
 * linux/arch/sh/mm/init.c
 *
 *  Copyright (C) 1999  Niibe Yutaka
 *  Copyright (C) 2002 - 2007  Paul Mundt
 *
 *  Based on linux/arch/i386/mm/init.c:
 *   Copyright (C) 1995  Linus Torvalds
 */
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/proc_fs.h>
#include <linux/pagemap.h>
#include <linux/percpu.h>
#include <linux/io.h>
#include <asm/mmu_context.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
#include <asm/sections.h>
#include <asm/cache.h>

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];

#ifdef CONFIG_SUPERH32
/*
 * Handle trivial transitions between cached and uncached
 * segments, making use of the 1:1 mapping relationship in
 * 512MB lowmem.
 *
 * This is the offset of the uncached section from its cached alias.
 * Default value only valid in 29 bit mode, in 32bit mode will be
 * overridden in pmb_init.
 */
unsigned long cached_to_uncached = P2SEG - P1SEG;
#endif

#ifdef CONFIG_MMU
static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	pgd = pgd_offset_k(addr);
	if (pgd_none(*pgd)) {
		pgd_ERROR(*pgd);
		return;
	}

	pud = pud_alloc(NULL, pgd, addr);
	if (unlikely(!pud)) {
		pud_ERROR(*pud);
		return;
	}

	pmd = pmd_alloc(NULL, pud, addr);
	if (unlikely(!pmd)) {
		pmd_ERROR(*pmd);
		return;
	}

	pte = pte_offset_kernel(pmd, addr);
	if (!pte_none(*pte)) {
		pte_ERROR(*pte);
		return;
	}

	set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
	local_flush_tlb_one(get_asid(), addr);
}

/*
 * As a performance optimization, other platforms preserve the fixmap mapping
 * across a context switch, we don't presently do this, but this could be done
 * in a similar fashion as to the wired TLB interface that sh64 uses (by way
 * of the memory mapped UTLB configuration) -- this unfortunately forces us to
 * give up a TLB entry for each mapping we want to preserve. While this may be
 * viable for a small number of fixmaps, it's not particularly useful for
 * everything and needs to be carefully evaluated. (ie, we may want this for
 * the vsyscall page).
 *
 * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
 * in at __set_fixmap() time to determine the appropriate behavior to follow.
 *
 *					 -- PFM.
 */
void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
{
	unsigned long address = __fix_to_virt(idx);

	if (idx >= __end_of_fixed_addresses) {
		BUG();
		return;
	}

	set_pte_phys(address, phys, prot);
}

void __init page_table_range_init(unsigned long start, unsigned long end,
					 pgd_t *pgd_base)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	int pgd_idx;
	unsigned long vaddr;

	vaddr = start & PMD_MASK;
	end = (end + PMD_SIZE - 1) & PMD_MASK;
	pgd_idx = pgd_index(vaddr);
	pgd = pgd_base + pgd_idx;

	for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
		BUG_ON(pgd_none(*pgd));
		pud = pud_offset(pgd, 0);
		BUG_ON(pud_none(*pud));
		pmd = pmd_offset(pud, 0);

		if (!pmd_present(*pmd)) {
			pte_t *pte_table;
			pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
			pmd_populate_kernel(&init_mm, pmd, pte_table);
		}

		vaddr += PMD_SIZE;
	}
}
#endif	/* CONFIG_MMU */

/*
 * paging_init() sets up the page tables
 */
void __init paging_init(void)
{
	unsigned long max_zone_pfns[MAX_NR_ZONES];
	unsigned long vaddr;
	int nid;

	/* We don't need to map the kernel through the TLB, as
	 * it is permanatly mapped using P1. So clear the
	 * entire pgd. */
	memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));

	/* Set an initial value for the MMU.TTB so we don't have to
	 * check for a null value. */
	set_TTB(swapper_pg_dir);

	/*
	 * Populate the relevant portions of swapper_pg_dir so that
	 * we can use the fixmap entries without calling kmalloc.
	 * pte's will be filled in by __set_fixmap().
	 */
	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
	page_table_range_init(vaddr, 0, swapper_pg_dir);

	kmap_coherent_init();

	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));

	for_each_online_node(nid) {
		pg_data_t *pgdat = NODE_DATA(nid);
		unsigned long low, start_pfn;

		start_pfn = pgdat->bdata->node_min_pfn;
		low = pgdat->bdata->node_low_pfn;

		if (max_zone_pfns[ZONE_NORMAL] < low)
			max_zone_pfns[ZONE_NORMAL] = low;

		printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
		       nid, start_pfn, low);
	}

	free_area_init_nodes(max_zone_pfns);

	/* Set up the uncached fixmap */
	set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
}

static struct kcore_list kcore_mem, kcore_vmalloc;

void __init mem_init(void)
{
	int codesize, datasize, initsize;
	int nid;

	num_physpages = 0;
	high_memory = NULL;

	for_each_online_node(nid) {
		pg_data_t *pgdat = NODE_DATA(nid);
		unsigned long node_pages = 0;
		void *node_high_memory;

		num_physpages += pgdat->node_present_pages;

		if (pgdat->node_spanned_pages)
			node_pages = free_all_bootmem_node(pgdat);

		totalram_pages += node_pages;

		node_high_memory = (void *)__va((pgdat->node_start_pfn +
						 pgdat->node_spanned_pages) <<
						 PAGE_SHIFT);
		if (node_high_memory > high_memory)
			high_memory = node_high_memory;
	}

	/* clear the zero-page */
	memset(empty_zero_page, 0, PAGE_SIZE);
	__flush_wback_region(empty_zero_page, PAGE_SIZE);

	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;

	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
		   VMALLOC_END - VMALLOC_START);

	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
	       "%dk data, %dk init)\n",
		(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
		num_physpages << (PAGE_SHIFT-10),
		codesize >> 10,
		datasize >> 10,
		initsize >> 10);

	p3_cache_init();

	/* Initialize the vDSO */
	vsyscall_init();
}

void free_initmem(void)
{
	unsigned long addr;

	addr = (unsigned long)(&__init_begin);
	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(addr));
		init_page_count(virt_to_page(addr));
		free_page(addr);
		totalram_pages++;
	}
	printk("Freeing unused kernel memory: %ldk freed\n",
	       ((unsigned long)&__init_end -
	        (unsigned long)&__init_begin) >> 10);
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
	unsigned long p;
	for (p = start; p < end; p += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(p));
		init_page_count(virt_to_page(p));
		free_page(p);
		totalram_pages++;
	}
	printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif

#if THREAD_SHIFT < PAGE_SHIFT
static struct kmem_cache *thread_info_cache;

struct thread_info *alloc_thread_info(struct task_struct *tsk)
{
	struct thread_info *ti;

	ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
	if (unlikely(ti == NULL))
		return NULL;
#ifdef CONFIG_DEBUG_STACK_USAGE
	memset(ti, 0, THREAD_SIZE);
#endif
	return ti;
}

void free_thread_info(struct thread_info *ti)
{
	kmem_cache_free(thread_info_cache, ti);
}

void thread_info_cache_init(void)
{
	thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
					      THREAD_SIZE, 0, NULL);
	BUG_ON(thread_info_cache == NULL);
}
#endif /* THREAD_SHIFT < PAGE_SHIFT */

#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size)
{
	pg_data_t *pgdat;
	unsigned long start_pfn = start >> PAGE_SHIFT;
	unsigned long nr_pages = size >> PAGE_SHIFT;
	int ret;

	pgdat = NODE_DATA(nid);

	/* We only have ZONE_NORMAL, so this is easy.. */
	ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
				start_pfn, nr_pages);
	if (unlikely(ret))
		printk("%s: Failed, __add_pages() == %d\n", __func__, ret);

	return ret;
}
EXPORT_SYMBOL_GPL(arch_add_memory);

#ifdef CONFIG_NUMA
int memory_add_physaddr_to_nid(u64 addr)
{
	/* Node 0 for now.. */
	return 0;
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
#endif /* CONFIG_MEMORY_HOTPLUG */
Commit	Line	Data
01066625 PM	1	/*
01066625 PM	2	* linux/arch/sh/mm/init.c
1da177e4 LT	3	*
1da177e4 LT	4	* Copyright (C) 1999 Niibe Yutaka
01066625	5	* Copyright (C) 2002 - 2007 Paul Mundt
1da177e4 LT	6	*
	7	* Based on linux/arch/i386/mm/init.c:
	8	* Copyright (C) 1995 Linus Torvalds
	9	*/
1da177e4 LT	10	#include <linux/mm.h>
1da177e4 LT	11	#include <linux/swap.h>
1da177e4	12	#include <linux/init.h>
1da177e4	13	#include <linux/bootmem.h>
2cb7ce3b	14	#include <linux/proc_fs.h>
27641dee	15	#include <linux/pagemap.h>
01066625 PM	16	#include <linux/percpu.h>
01066625 PM	17	#include <linux/io.h>
1da177e4	18	#include <asm/mmu_context.h>
1da177e4 LT	19	#include <asm/tlb.h>
1da177e4 LT	20	#include <asm/cacheflush.h>
07cbb41b	21	#include <asm/sections.h>
1da177e4 LT	22	#include <asm/cache.h>
	23
	24	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	25	pgd_t swapper_pg_dir[PTRS_PER_PGD];
c6feb614 SM	26
	27	#ifdef CONFIG_SUPERH32
	28	/*
	29	* Handle trivial transitions between cached and uncached
	30	* segments, making use of the 1:1 mapping relationship in
	31	* 512MB lowmem.
	32	*
	33	* This is the offset of the uncached section from its cached alias.
	34	* Default value only valid in 29 bit mode, in 32bit mode will be
	35	* overridden in pmb_init.
	36	*/
	37	unsigned long cached_to_uncached = P2SEG - P1SEG;
	38	#endif
1da177e4	39
11cbb70e	40	#ifdef CONFIG_MMU
1da177e4 LT	41	static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
	42	{
	43	pgd_t *pgd;
26ff6c11	44	pud_t *pud;
1da177e4 LT	45	pmd_t *pmd;
	46	pte_t *pte;
	47
99a596f9	48	pgd = pgd_offset_k(addr);
1da177e4 LT	49	if (pgd_none(*pgd)) {
	50	pgd_ERROR(*pgd);
	51	return;
	52	}
	53
99a596f9 SM	54	pud = pud_alloc(NULL, pgd, addr);
	55	if (unlikely(!pud)) {
	56	pud_ERROR(*pud);
	57	return;
26ff6c11 PM	58	}
26ff6c11 PM	59
99a596f9 SM	60	pmd = pmd_alloc(NULL, pud, addr);
	61	if (unlikely(!pmd)) {
	62	pmd_ERROR(*pmd);
	63	return;
1da177e4 LT	64	}
	65
	66	pte = pte_offset_kernel(pmd, addr);
	67	if (!pte_none(*pte)) {
	68	pte_ERROR(*pte);
	69	return;
	70	}
	71
	72	set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
997d0030	73	local_flush_tlb_one(get_asid(), addr);
1da177e4 LT	74	}
	75
	76	/*
	77	* As a performance optimization, other platforms preserve the fixmap mapping
	78	* across a context switch, we don't presently do this, but this could be done
	79	* in a similar fashion as to the wired TLB interface that sh64 uses (by way
e868d612	80	* of the memory mapped UTLB configuration) -- this unfortunately forces us to
1da177e4 LT	81	* give up a TLB entry for each mapping we want to preserve. While this may be
	82	* viable for a small number of fixmaps, it's not particularly useful for
	83	* everything and needs to be carefully evaluated. (ie, we may want this for
	84	* the vsyscall page).
	85	*
	86	* XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
	87	* in at __set_fixmap() time to determine the appropriate behavior to follow.
	88	*
	89	* -- PFM.
	90	*/
	91	void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
	92	{
	93	unsigned long address = __fix_to_virt(idx);
	94
	95	if (idx >= __end_of_fixed_addresses) {
	96	BUG();
	97	return;
	98	}
	99
	100	set_pte_phys(address, phys, prot);
	101	}
2adb4e10 SM	102
	103	void __init page_table_range_init(unsigned long start, unsigned long end,
	104	pgd_t *pgd_base)
	105	{
	106	pgd_t *pgd;
	107	pud_t *pud;
	108	pmd_t *pmd;
	109	int pgd_idx;
	110	unsigned long vaddr;
	111
	112	vaddr = start & PMD_MASK;
	113	end = (end + PMD_SIZE - 1) & PMD_MASK;
	114	pgd_idx = pgd_index(vaddr);
	115	pgd = pgd_base + pgd_idx;
	116
	117	for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
	118	BUG_ON(pgd_none(*pgd));
	119	pud = pud_offset(pgd, 0);
	120	BUG_ON(pud_none(*pud));
	121	pmd = pmd_offset(pud, 0);
	122
	123	if (!pmd_present(*pmd)) {
	124	pte_t *pte_table;
	125	pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
2adb4e10 SM	126	pmd_populate_kernel(&init_mm, pmd, pte_table);
	127	}
	128
	129	vaddr += PMD_SIZE;
	130	}
	131	}
11cbb70e	132	#endif /* CONFIG_MMU */
1da177e4	133
1da177e4 LT	134	/*
1da177e4 LT	135	* paging_init() sets up the page tables
1da177e4 LT	136	*/
	137	void __init paging_init(void)
	138	{
2de212eb	139	unsigned long max_zone_pfns[MAX_NR_ZONES];
acca4f4d	140	unsigned long vaddr;
01066625	141	int nid;
1da177e4	142
01066625 PM	143	/* We don't need to map the kernel through the TLB, as
	144	* it is permanatly mapped using P1. So clear the
	145	* entire pgd. */
	146	memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
1da177e4	147
6e4662ff SM	148	/* Set an initial value for the MMU.TTB so we don't have to
	149	* check for a null value. */
	150	set_TTB(swapper_pg_dir);
	151
acca4f4d PM	152	/*
acca4f4d PM	153	* Populate the relevant portions of swapper_pg_dir so that
2adb4e10	154	* we can use the fixmap entries without calling kmalloc.
acca4f4d PM	155	* pte's will be filled in by __set_fixmap().
	156	*/
	157	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
	158	page_table_range_init(vaddr, 0, swapper_pg_dir);
	159
	160	kmap_coherent_init();
2adb4e10	161
2de212eb PM	162	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
2de212eb PM	163
01066625 PM	164	for_each_online_node(nid) {
01066625 PM	165	pg_data_t *pgdat = NODE_DATA(nid);
01066625 PM	166	unsigned long low, start_pfn;
01066625 PM	167
3560e249	168	start_pfn = pgdat->bdata->node_min_pfn;
01066625 PM	169	low = pgdat->bdata->node_low_pfn;
01066625 PM	170
2de212eb PM	171	if (max_zone_pfns[ZONE_NORMAL] < low)
2de212eb PM	172	max_zone_pfns[ZONE_NORMAL] = low;
01066625 PM	173
	174	printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
	175	nid, start_pfn, low);
01066625	176	}
2de212eb PM	177
2de212eb PM	178	free_area_init_nodes(max_zone_pfns);
cbaa118e SM	179
	180	/* Set up the uncached fixmap */
	181	set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
1da177e4 LT	182	}
1da177e4 LT	183
2cb7ce3b PM	184	static struct kcore_list kcore_mem, kcore_vmalloc;
2cb7ce3b PM	185
1da177e4 LT	186	void __init mem_init(void)
1da177e4 LT	187	{
dfbb9042	188	int codesize, datasize, initsize;
01066625	189	int nid;
1da177e4	190
2de212eb PM	191	num_physpages = 0;
	192	high_memory = NULL;
	193
01066625 PM	194	for_each_online_node(nid) {
	195	pg_data_t *pgdat = NODE_DATA(nid);
	196	unsigned long node_pages = 0;
	197	void *node_high_memory;
01066625 PM	198
	199	num_physpages += pgdat->node_present_pages;
	200
	201	if (pgdat->node_spanned_pages)
	202	node_pages = free_all_bootmem_node(pgdat);
	203
	204	totalram_pages += node_pages;
1da177e4	205
2de212eb PM	206	node_high_memory = (void *)__va((pgdat->node_start_pfn +
	207	pgdat->node_spanned_pages) <<
	208	PAGE_SHIFT);
01066625 PM	209	if (node_high_memory > high_memory)
	210	high_memory = node_high_memory;
	211	}
1da177e4 LT	212
	213	/* clear the zero-page */
	214	memset(empty_zero_page, 0, PAGE_SIZE);
	215	__flush_wback_region(empty_zero_page, PAGE_SIZE);
	216
1da177e4 LT	217	codesize = (unsigned long) &_etext - (unsigned long) &_text;
	218	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
	219	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
	220
2cb7ce3b PM	221	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	222	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
	223	VMALLOC_END - VMALLOC_START);
	224
	225	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
dfbb9042	226	"%dk data, %dk init)\n",
1da177e4	227	(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
2de212eb	228	num_physpages << (PAGE_SHIFT-10),
1da177e4	229	codesize >> 10,
1da177e4 LT	230	datasize >> 10,
	231	initsize >> 10);
	232
	233	p3_cache_init();
19f9a34f PM	234
	235	/* Initialize the vDSO */
	236	vsyscall_init();
1da177e4 LT	237	}
	238
	239	void free_initmem(void)
	240	{
	241	unsigned long addr;
65463b73	242
1da177e4 LT	243	addr = (unsigned long)(&__init_begin);
	244	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
	245	ClearPageReserved(virt_to_page(addr));
7835e98b	246	init_page_count(virt_to_page(addr));
1da177e4 LT	247	free_page(addr);
	248	totalram_pages++;
	249	}
07cbb41b PM	250	printk("Freeing unused kernel memory: %ldk freed\n",
	251	((unsigned long)&__init_end -
	252	(unsigned long)&__init_begin) >> 10);
1da177e4 LT	253	}
	254
	255	#ifdef CONFIG_BLK_DEV_INITRD
	256	void free_initrd_mem(unsigned long start, unsigned long end)
	257	{
	258	unsigned long p;
	259	for (p = start; p < end; p += PAGE_SIZE) {
	260	ClearPageReserved(virt_to_page(p));
7835e98b	261	init_page_count(virt_to_page(p));
1da177e4 LT	262	free_page(p);
	263	totalram_pages++;
	264	}
2de212eb	265	printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1da177e4 LT	266	}
1da177e4 LT	267	#endif
33d63bd8	268
c15c5f8c PM	269	#if THREAD_SHIFT < PAGE_SHIFT
	270	static struct kmem_cache *thread_info_cache;
	271
	272	struct thread_info alloc_thread_info(struct task_struct tsk)
	273	{
	274	struct thread_info *ti;
	275
	276	ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
	277	if (unlikely(ti == NULL))
	278	return NULL;
	279	#ifdef CONFIG_DEBUG_STACK_USAGE
	280	memset(ti, 0, THREAD_SIZE);
	281	#endif
	282	return ti;
	283	}
	284
	285	void free_thread_info(struct thread_info *ti)
	286	{
	287	kmem_cache_free(thread_info_cache, ti);
	288	}
	289
	290	void thread_info_cache_init(void)
	291	{
	292	thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
	293	THREAD_SIZE, 0, NULL);
	294	BUG_ON(thread_info_cache == NULL);
	295	}
	296	#endif /* THREAD_SHIFT < PAGE_SHIFT */
	297
33d63bd8	298	#ifdef CONFIG_MEMORY_HOTPLUG
33d63bd8 PM	299	int arch_add_memory(int nid, u64 start, u64 size)
	300	{
	301	pg_data_t *pgdat;
	302	unsigned long start_pfn = start >> PAGE_SHIFT;
	303	unsigned long nr_pages = size >> PAGE_SHIFT;
	304	int ret;
	305
	306	pgdat = NODE_DATA(nid);
	307
	308	/* We only have ZONE_NORMAL, so this is easy.. */
c04fc586 GH	309	ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
c04fc586 GH	310	start_pfn, nr_pages);
33d63bd8	311	if (unlikely(ret))
866e6b9e	312	printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
33d63bd8 PM	313
	314	return ret;
	315	}
	316	EXPORT_SYMBOL_GPL(arch_add_memory);
	317
357d5946	318	#ifdef CONFIG_NUMA
33d63bd8 PM	319	int memory_add_physaddr_to_nid(u64 addr)
	320	{
	321	/* Node 0 for now.. */
	322	return 0;
	323	}
	324	EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
	325	#endif
3159e7d6	326	#endif /* CONFIG_MEMORY_HOTPLUG */