[mirror_ubuntu-bionic-kernel.git] / mm / nobootmem.c

/*
 *  bootmem - A boot-time physical memory allocator and configurator
 *
 *  Copyright (C) 1999 Ingo Molnar
 *                1999 Kanoj Sarcar, SGI
 *                2008 Johannes Weiner
 *
 * Access to this subsystem has to be serialized externally (which is true
 * for the boot process anyway).
 */
#include <linux/init.h>
#include <linux/pfn.h>
#include <linux/slab.h>
#include <linux/bootmem.h>
#include <linux/export.h>
#include <linux/kmemleak.h>
#include <linux/range.h>
#include <linux/memblock.h>

#include <asm/bug.h>
#include <asm/io.h>
#include <asm/processor.h>

#include "internal.h"

#ifndef CONFIG_NEED_MULTIPLE_NODES
struct pglist_data __refdata contig_page_data;
EXPORT_SYMBOL(contig_page_data);
#endif

unsigned long max_low_pfn;
unsigned long min_low_pfn;
unsigned long max_pfn;

static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
					u64 goal, u64 limit)
{
	void *ptr;
	u64 addr;

	if (limit > memblock.current_limit)
		limit = memblock.current_limit;

	addr = memblock_find_in_range_node(goal, limit, size, align, nid);
	if (!addr)
		return NULL;

	memblock_reserve(addr, size);
	ptr = phys_to_virt(addr);
	memset(ptr, 0, size);
	/*
	 * The min_count is set to 0 so that bootmem allocated blocks
	 * are never reported as leaks.
	 */
	kmemleak_alloc(ptr, size, 0, 0);
	return ptr;
}

/*
 * free_bootmem_late - free bootmem pages directly to page allocator
 * @addr: starting address of the range
 * @size: size of the range in bytes
 *
 * This is only useful when the bootmem allocator has already been torn
 * down, but we are still initializing the system.  Pages are given directly
 * to the page allocator, no bootmem metadata is updated because it is gone.
 */
void __init free_bootmem_late(unsigned long addr, unsigned long size)
{
	unsigned long cursor, end;

	kmemleak_free_part(__va(addr), size);

	cursor = PFN_UP(addr);
	end = PFN_DOWN(addr + size);

	for (; cursor < end; cursor++) {
		__free_pages_bootmem(pfn_to_page(cursor), 0);
		totalram_pages++;
	}
}

static void __init __free_pages_memory(unsigned long start, unsigned long end)
{
	unsigned long i, start_aligned, end_aligned;
	int order = ilog2(BITS_PER_LONG);

	start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
	end_aligned = end & ~(BITS_PER_LONG - 1);

	if (end_aligned <= start_aligned) {
		for (i = start; i < end; i++)
			__free_pages_bootmem(pfn_to_page(i), 0);

		return;
	}

	for (i = start; i < start_aligned; i++)
		__free_pages_bootmem(pfn_to_page(i), 0);

	for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
		__free_pages_bootmem(pfn_to_page(i), order);

	for (i = end_aligned; i < end; i++)
		__free_pages_bootmem(pfn_to_page(i), 0);
}

static unsigned long __init __free_memory_core(phys_addr_t start,
				 phys_addr_t end)
{
	unsigned long start_pfn = PFN_UP(start);
	unsigned long end_pfn = min_t(unsigned long,
				      PFN_DOWN(end), max_low_pfn);

	if (start_pfn > end_pfn)
		return 0;

	__free_pages_memory(start_pfn, end_pfn);

	return end_pfn - start_pfn;
}

static unsigned long __init free_low_memory_core_early(void)
{
	unsigned long count = 0;
	phys_addr_t start, end, size;
	u64 i;

	for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL)
		count += __free_memory_core(start, end);

	/* free range that is used for reserved array if we allocate it */
	size = get_allocated_memblock_reserved_regions_info(&start);
	if (size)
		count += __free_memory_core(start, start + size);

	return count;
}

static int reset_managed_pages_done __initdata;

static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
{
	struct zone *z;

	if (reset_managed_pages_done)
		return;
	for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
		z->managed_pages = 0;
}

void __init reset_all_zones_managed_pages(void)
{
	struct pglist_data *pgdat;

	for_each_online_pgdat(pgdat)
		reset_node_managed_pages(pgdat);
	reset_managed_pages_done = 1;
}

/**
 * free_all_bootmem - release free pages to the buddy allocator
 *
 * Returns the number of pages actually released.
 */
unsigned long __init free_all_bootmem(void)
{
	reset_all_zones_managed_pages();

	/*
	 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
	 *  because in some case like Node0 doesn't have RAM installed
	 *  low ram will be on Node1
	 */
	return free_low_memory_core_early();
}

/**
 * free_bootmem_node - mark a page range as usable
 * @pgdat: node the range resides on
 * @physaddr: starting address of the range
 * @size: size of the range in bytes
 *
 * Partial pages will be considered reserved and left as they are.
 *
 * The range must reside completely on the specified node.
 */
void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
			      unsigned long size)
{
	kmemleak_free_part(__va(physaddr), size);
	memblock_free(physaddr, size);
}

/**
 * free_bootmem - mark a page range as usable
 * @addr: starting address of the range
 * @size: size of the range in bytes
 *
 * Partial pages will be considered reserved and left as they are.
 *
 * The range must be contiguous but may span node boundaries.
 */
void __init free_bootmem(unsigned long addr, unsigned long size)
{
	kmemleak_free_part(__va(addr), size);
	memblock_free(addr, size);
}

static void * __init ___alloc_bootmem_nopanic(unsigned long size,
					unsigned long align,
					unsigned long goal,
					unsigned long limit)
{
	void *ptr;

	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc(size, GFP_NOWAIT);

restart:

	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);

	if (ptr)
		return ptr;

	if (goal != 0) {
		goal = 0;
		goto restart;
	}

	return NULL;
}

/**
 * __alloc_bootmem_nopanic - allocate boot memory without panicking
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may happen on any node in the system.
 *
 * Returns NULL on failure.
 */
void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
					unsigned long goal)
{
	unsigned long limit = -1UL;

	return ___alloc_bootmem_nopanic(size, align, goal, limit);
}

static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
					unsigned long goal, unsigned long limit)
{
	void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);

	if (mem)
		return mem;
	/*
	 * Whoops, we cannot satisfy the allocation request.
	 */
	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	panic("Out of memory");
	return NULL;
}

/**
 * __alloc_bootmem - allocate boot memory
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may happen on any node in the system.
 *
 * The function panics if the request can not be satisfied.
 */
void * __init __alloc_bootmem(unsigned long size, unsigned long align,
			      unsigned long goal)
{
	unsigned long limit = -1UL;

	return ___alloc_bootmem(size, align, goal, limit);
}

void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
						   unsigned long size,
						   unsigned long align,
						   unsigned long goal,
						   unsigned long limit)
{
	void *ptr;

again:
	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
					goal, limit);
	if (ptr)
		return ptr;

	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
					goal, limit);
	if (ptr)
		return ptr;

	if (goal) {
		goal = 0;
		goto again;
	}

	return NULL;
}

void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
				   unsigned long align, unsigned long goal)
{
	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

	return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
}

void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
				    unsigned long align, unsigned long goal,
				    unsigned long limit)
{
	void *ptr;

	ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
	if (ptr)
		return ptr;

	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	panic("Out of memory");
	return NULL;
}

/**
 * __alloc_bootmem_node - allocate boot memory from a specific node
 * @pgdat: node to allocate from
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may fall back to any node in the system if the specified node
 * can not hold the requested memory.
 *
 * The function panics if the request can not be satisfied.
 */
void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
				   unsigned long align, unsigned long goal)
{
	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

	return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
}

void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
				   unsigned long align, unsigned long goal)
{
	return __alloc_bootmem_node(pgdat, size, align, goal);
}

#ifndef ARCH_LOW_ADDRESS_LIMIT
#define ARCH_LOW_ADDRESS_LIMIT	0xffffffffUL
#endif

/**
 * __alloc_bootmem_low - allocate low boot memory
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may happen on any node in the system.
 *
 * The function panics if the request can not be satisfied.
 */
void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
				  unsigned long goal)
{
	return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
}

void * __init __alloc_bootmem_low_nopanic(unsigned long size,
					  unsigned long align,
					  unsigned long goal)
{
	return ___alloc_bootmem_nopanic(size, align, goal,
					ARCH_LOW_ADDRESS_LIMIT);
}

/**
 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 * @pgdat: node to allocate from
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may fall back to any node in the system if the specified node
 * can not hold the requested memory.
 *
 * The function panics if the request can not be satisfied.
 */
void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
				       unsigned long align, unsigned long goal)
{
	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

	return ___alloc_bootmem_node(pgdat, size, align, goal,
				     ARCH_LOW_ADDRESS_LIMIT);
}
Commit	Line	Data
09325873 YL	1	/*
	2	* bootmem - A boot-time physical memory allocator and configurator
	3	*
	4	* Copyright (C) 1999 Ingo Molnar
	5	* 1999 Kanoj Sarcar, SGI
	6	* 2008 Johannes Weiner
	7	*
	8	* Access to this subsystem has to be serialized externally (which is true
	9	* for the boot process anyway).
	10	*/
	11	#include <linux/init.h>
	12	#include <linux/pfn.h>
	13	#include <linux/slab.h>
	14	#include <linux/bootmem.h>
b95f1b31	15	#include <linux/export.h>
09325873 YL	16	#include <linux/kmemleak.h>
	17	#include <linux/range.h>
	18	#include <linux/memblock.h>
	19
	20	#include <asm/bug.h>
	21	#include <asm/io.h>
	22	#include <asm/processor.h>
	23
	24	#include "internal.h"
	25
e782ab42 YL	26	#ifndef CONFIG_NEED_MULTIPLE_NODES
	27	struct pglist_data __refdata contig_page_data;
	28	EXPORT_SYMBOL(contig_page_data);
	29	#endif
	30
09325873 YL	31	unsigned long max_low_pfn;
	32	unsigned long min_low_pfn;
	33	unsigned long max_pfn;
	34
8bc1f91e YL	35	static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
	36	u64 goal, u64 limit)
	37	{
	38	void *ptr;
	39	u64 addr;
	40
	41	if (limit > memblock.current_limit)
	42	limit = memblock.current_limit;
	43
eb40c4c2	44	addr = memblock_find_in_range_node(goal, limit, size, align, nid);
1f5026a7	45	if (!addr)
8bc1f91e YL	46	return NULL;
8bc1f91e YL	47
b476e295	48	memblock_reserve(addr, size);
8bc1f91e YL	49	ptr = phys_to_virt(addr);
8bc1f91e YL	50	memset(ptr, 0, size);
8bc1f91e YL	51	/*
	52	* The min_count is set to 0 so that bootmem allocated blocks
	53	* are never reported as leaks.
	54	*/
	55	kmemleak_alloc(ptr, size, 0, 0);
	56	return ptr;
	57	}
	58
09325873 YL	59	/*
	60	* free_bootmem_late - free bootmem pages directly to page allocator
	61	* @addr: starting address of the range
	62	* @size: size of the range in bytes
	63	*
	64	* This is only useful when the bootmem allocator has already been torn
	65	* down, but we are still initializing the system. Pages are given directly
	66	* to the page allocator, no bootmem metadata is updated because it is gone.
	67	*/
	68	void __init free_bootmem_late(unsigned long addr, unsigned long size)
	69	{
	70	unsigned long cursor, end;
	71
	72	kmemleak_free_part(__va(addr), size);
	73
	74	cursor = PFN_UP(addr);
	75	end = PFN_DOWN(addr + size);
	76
	77	for (; cursor < end; cursor++) {
	78	__free_pages_bootmem(pfn_to_page(cursor), 0);
	79	totalram_pages++;
	80	}
	81	}
	82
	83	static void __init __free_pages_memory(unsigned long start, unsigned long end)
	84	{
6bc2e853	85	unsigned long i, start_aligned, end_aligned;
09325873 YL	86	int order = ilog2(BITS_PER_LONG);
	87
	88	start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
	89	end_aligned = end & ~(BITS_PER_LONG - 1);
	90
	91	if (end_aligned <= start_aligned) {
	92	for (i = start; i < end; i++)
	93	__free_pages_bootmem(pfn_to_page(i), 0);
	94
	95	return;
	96	}
	97
	98	for (i = start; i < start_aligned; i++)
	99	__free_pages_bootmem(pfn_to_page(i), 0);
	100
	101	for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
	102	__free_pages_bootmem(pfn_to_page(i), order);
	103
	104	for (i = end_aligned; i < end; i++)
	105	__free_pages_bootmem(pfn_to_page(i), 0);
	106	}
	107
29f67386 YL	108	static unsigned long __init __free_memory_core(phys_addr_t start,
	109	phys_addr_t end)
	110	{
	111	unsigned long start_pfn = PFN_UP(start);
	112	unsigned long end_pfn = min_t(unsigned long,
	113	PFN_DOWN(end), max_low_pfn);
	114
	115	if (start_pfn > end_pfn)
	116	return 0;
	117
	118	__free_pages_memory(start_pfn, end_pfn);
	119
	120	return end_pfn - start_pfn;
	121	}
	122
b4def350	123	static unsigned long __init free_low_memory_core_early(void)
09325873	124	{
09325873	125	unsigned long count = 0;
29f67386	126	phys_addr_t start, end, size;
8a9ca34c TH	127	u64 i;
8a9ca34c TH	128
29f67386 YL	129	for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL)
	130	count += __free_memory_core(start, end);
	131
	132	/* free range that is used for reserved array if we allocate it */
	133	size = get_allocated_memblock_reserved_regions_info(&start);
	134	if (size)
	135	count += __free_memory_core(start, start + size);
09325873 YL	136
	137	return count;
	138	}
	139
7b4b2a0d JL	140	static int reset_managed_pages_done __initdata;
	141
	142	static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
9feedc9d JL	143	{
	144	struct zone *z;
	145
7b4b2a0d JL	146	if (reset_managed_pages_done)
7b4b2a0d JL	147	return;
9feedc9d	148	for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
7b4b2a0d JL	149	z->managed_pages = 0;
	150	}
	151
	152	void __init reset_all_zones_managed_pages(void)
	153	{
	154	struct pglist_data *pgdat;
	155
	156	for_each_online_pgdat(pgdat)
	157	reset_node_managed_pages(pgdat);
	158	reset_managed_pages_done = 1;
9feedc9d JL	159	}
9feedc9d JL	160
09325873 YL	161	/**
	162	* free_all_bootmem - release free pages to the buddy allocator
	163	*
	164	* Returns the number of pages actually released.
	165	*/
	166	unsigned long __init free_all_bootmem(void)
	167	{
7b4b2a0d	168	reset_all_zones_managed_pages();
9feedc9d	169
09325873 YL	170	/*
09325873 YL	171	* We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
25985edc	172	* because in some case like Node0 doesn't have RAM installed
09325873	173	* low ram will be on Node1
09325873	174	*/
b4def350	175	return free_low_memory_core_early();
09325873 YL	176	}
	177
	178	/**
	179	* free_bootmem_node - mark a page range as usable
	180	* @pgdat: node the range resides on
	181	* @physaddr: starting address of the range
	182	* @size: size of the range in bytes
	183	*
	184	* Partial pages will be considered reserved and left as they are.
	185	*
	186	* The range must reside completely on the specified node.
	187	*/
	188	void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
	189	unsigned long size)
	190	{
	191	kmemleak_free_part(__va(physaddr), size);
24aa0788	192	memblock_free(physaddr, size);
09325873 YL	193	}
	194
	195	/**
	196	* free_bootmem - mark a page range as usable
	197	* @addr: starting address of the range
	198	* @size: size of the range in bytes
	199	*
	200	* Partial pages will be considered reserved and left as they are.
	201	*
	202	* The range must be contiguous but may span node boundaries.
	203	*/
	204	void __init free_bootmem(unsigned long addr, unsigned long size)
	205	{
	206	kmemleak_free_part(__va(addr), size);
24aa0788	207	memblock_free(addr, size);
09325873 YL	208	}
	209
	210	static void * __init ___alloc_bootmem_nopanic(unsigned long size,
	211	unsigned long align,
	212	unsigned long goal,
	213	unsigned long limit)
	214	{
	215	void *ptr;
	216
	217	if (WARN_ON_ONCE(slab_is_available()))
	218	return kzalloc(size, GFP_NOWAIT);
	219
	220	restart:
	221
	222	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
	223
	224	if (ptr)
	225	return ptr;
	226
	227	if (goal != 0) {
	228	goal = 0;
	229	goto restart;
	230	}
	231
	232	return NULL;
	233	}
	234
	235	/**
	236	* __alloc_bootmem_nopanic - allocate boot memory without panicking
	237	* @size: size of the request in bytes
	238	* @align: alignment of the region
	239	* @goal: preferred starting address of the region
	240	*
	241	* The goal is dropped if it can not be satisfied and the allocation will
	242	* fall back to memory below @goal.
	243	*
	244	* Allocation may happen on any node in the system.
	245	*
	246	* Returns NULL on failure.
	247	*/
	248	void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
	249	unsigned long goal)
	250	{
	251	unsigned long limit = -1UL;
	252
	253	return ___alloc_bootmem_nopanic(size, align, goal, limit);
	254	}
	255
	256	static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
	257	unsigned long goal, unsigned long limit)
	258	{
	259	void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
	260
	261	if (mem)
	262	return mem;
	263	/*
	264	* Whoops, we cannot satisfy the allocation request.
	265	*/
	266	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	267	panic("Out of memory");
	268	return NULL;
	269	}
	270
	271	/**
272	* __alloc_bootmem - allocate boot memory
273	* @size: size of the request in bytes
274	* @align: alignment of the region
275	* @goal: preferred starting address of the region
276	*
277	* The goal is dropped if it can not be satisfied and the allocation will
278	* fall back to memory below @goal.
279	*
280	* Allocation may happen on any node in the system.
281	*
282	* The function panics if the request can not be satisfied.
283	*/
284	void * __init __alloc_bootmem(unsigned long size, unsigned long align,
285	unsigned long goal)
286	{
287	unsigned long limit = -1UL;
288
289	return ___alloc_bootmem(size, align, goal, limit);
290	}
291
99ab7b19	292	void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
ba539868 JW	293	unsigned long size,
	294	unsigned long align,
	295	unsigned long goal,
	296	unsigned long limit)
	297	{
	298	void *ptr;
	299
	300	again:
	301	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
	302	goal, limit);
	303	if (ptr)
	304	return ptr;
	305
	306	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
	307	goal, limit);
	308	if (ptr)
	309	return ptr;
	310
	311	if (goal) {
	312	goal = 0;
	313	goto again;
	314	}
	315
	316	return NULL;
	317	}
	318
	319	void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
	320	unsigned long align, unsigned long goal)
	321	{
	322	if (WARN_ON_ONCE(slab_is_available()))
	323	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	324
	325	return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
	326	}
	327
	328	void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
	329	unsigned long align, unsigned long goal,
	330	unsigned long limit)
	331	{
	332	void *ptr;
	333
	334	ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
	335	if (ptr)
	336	return ptr;
	337
	338	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	339	panic("Out of memory");
	340	return NULL;
	341	}
	342
09325873 YL	343	/**
	344	* __alloc_bootmem_node - allocate boot memory from a specific node
	345	* @pgdat: node to allocate from
	346	* @size: size of the request in bytes
	347	* @align: alignment of the region
	348	* @goal: preferred starting address of the region
	349	*
	350	* The goal is dropped if it can not be satisfied and the allocation will
	351	* fall back to memory below @goal.
	352	*
	353	* Allocation may fall back to any node in the system if the specified node
	354	* can not hold the requested memory.
	355	*
	356	* The function panics if the request can not be satisfied.
	357	*/
	358	void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
	359	unsigned long align, unsigned long goal)
	360	{
09325873 YL	361	if (WARN_ON_ONCE(slab_is_available()))
	362	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	363
ba539868	364	return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
09325873 YL	365	}
	366
	367	void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
	368	unsigned long align, unsigned long goal)
	369	{
09325873	370	return __alloc_bootmem_node(pgdat, size, align, goal);
09325873 YL	371	}
09325873 YL	372
09325873 YL	373	#ifndef ARCH_LOW_ADDRESS_LIMIT
	374	#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
	375	#endif
	376
	377	/**
	378	* __alloc_bootmem_low - allocate low boot memory
	379	* @size: size of the request in bytes
	380	* @align: alignment of the region
	381	* @goal: preferred starting address of the region
	382	*
	383	* The goal is dropped if it can not be satisfied and the allocation will
	384	* fall back to memory below @goal.
	385	*
	386	* Allocation may happen on any node in the system.
	387	*
	388	* The function panics if the request can not be satisfied.
	389	*/
	390	void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
	391	unsigned long goal)
	392	{
	393	return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
	394	}
	395
38fa4175 YL	396	void * __init __alloc_bootmem_low_nopanic(unsigned long size,
	397	unsigned long align,
	398	unsigned long goal)
	399	{
	400	return ___alloc_bootmem_nopanic(size, align, goal,
	401	ARCH_LOW_ADDRESS_LIMIT);
	402	}
	403
09325873 YL	404	/**
	405	* __alloc_bootmem_low_node - allocate low boot memory from a specific node
	406	* @pgdat: node to allocate from
	407	* @size: size of the request in bytes
	408	* @align: alignment of the region
	409	* @goal: preferred starting address of the region
	410	*
	411	* The goal is dropped if it can not be satisfied and the allocation will
	412	* fall back to memory below @goal.
	413	*
	414	* Allocation may fall back to any node in the system if the specified node
	415	* can not hold the requested memory.
	416	*
	417	* The function panics if the request can not be satisfied.
	418	*/
	419	void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
	420	unsigned long align, unsigned long goal)
	421	{
09325873 YL	422	if (WARN_ON_ONCE(slab_is_available()))
	423	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	424
ba539868 JW	425	return ___alloc_bootmem_node(pgdat, size, align, goal,
ba539868 JW	426	ARCH_LOW_ADDRESS_LIMIT);
09325873	427	}