[linux.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)
{
	unsigned long pages;

	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
	 */
	pages = free_low_memory_core_early();
	totalram_pages += pages;

	return pages;
}

/**
 * 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	{
0c988534 JL	168	unsigned long pages;
0c988534 JL	169
7b4b2a0d	170	reset_all_zones_managed_pages();
9feedc9d	171
09325873 YL	172	/*
09325873 YL	173	* We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
25985edc	174	* because in some case like Node0 doesn't have RAM installed
09325873	175	* low ram will be on Node1
09325873	176	*/
0c988534 JL	177	pages = free_low_memory_core_early();
	178	totalram_pages += pages;
	179
	180	return pages;
09325873 YL	181	}
	182
	183	/**
	184	* free_bootmem_node - mark a page range as usable
	185	* @pgdat: node the range resides on
	186	* @physaddr: starting address of the range
	187	* @size: size of the range in bytes
	188	*
	189	* Partial pages will be considered reserved and left as they are.
	190	*
	191	* The range must reside completely on the specified node.
	192	*/
	193	void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
	194	unsigned long size)
	195	{
	196	kmemleak_free_part(__va(physaddr), size);
24aa0788	197	memblock_free(physaddr, size);
09325873 YL	198	}
	199
	200	/**
	201	* free_bootmem - mark a page range as usable
	202	* @addr: starting address of the range
	203	* @size: size of the range in bytes
	204	*
	205	* Partial pages will be considered reserved and left as they are.
	206	*
	207	* The range must be contiguous but may span node boundaries.
	208	*/
	209	void __init free_bootmem(unsigned long addr, unsigned long size)
	210	{
	211	kmemleak_free_part(__va(addr), size);
24aa0788	212	memblock_free(addr, size);
09325873 YL	213	}
	214
	215	static void * __init ___alloc_bootmem_nopanic(unsigned long size,
	216	unsigned long align,
	217	unsigned long goal,
	218	unsigned long limit)
	219	{
	220	void *ptr;
	221
	222	if (WARN_ON_ONCE(slab_is_available()))
	223	return kzalloc(size, GFP_NOWAIT);
	224
	225	restart:
	226
	227	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
	228
	229	if (ptr)
	230	return ptr;
	231
	232	if (goal != 0) {
	233	goal = 0;
	234	goto restart;
	235	}
	236
	237	return NULL;
	238	}
	239
	240	/**
	241	* __alloc_bootmem_nopanic - allocate boot memory without panicking
	242	* @size: size of the request in bytes
	243	* @align: alignment of the region
	244	* @goal: preferred starting address of the region
	245	*
	246	* The goal is dropped if it can not be satisfied and the allocation will
	247	* fall back to memory below @goal.
	248	*
	249	* Allocation may happen on any node in the system.
	250	*
	251	* Returns NULL on failure.
	252	*/
	253	void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
	254	unsigned long goal)
	255	{
	256	unsigned long limit = -1UL;
	257
	258	return ___alloc_bootmem_nopanic(size, align, goal, limit);
	259	}
	260
	261	static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
	262	unsigned long goal, unsigned long limit)
	263	{
	264	void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
	265
	266	if (mem)
	267	return mem;
	268	/*
	269	* Whoops, we cannot satisfy the allocation request.
	270	*/
	271	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	272	panic("Out of memory");
	273	return NULL;
	274	}
	275
	276	/**
277	* __alloc_bootmem - allocate boot memory
278	* @size: size of the request in bytes
279	* @align: alignment of the region
280	* @goal: preferred starting address of the region
281	*
282	* The goal is dropped if it can not be satisfied and the allocation will
283	* fall back to memory below @goal.
284	*
285	* Allocation may happen on any node in the system.
286	*
287	* The function panics if the request can not be satisfied.
288	*/
289	void * __init __alloc_bootmem(unsigned long size, unsigned long align,
290	unsigned long goal)
291	{
292	unsigned long limit = -1UL;
293
294	return ___alloc_bootmem(size, align, goal, limit);
295	}
296
99ab7b19	297	void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
ba539868 JW	298	unsigned long size,
	299	unsigned long align,
	300	unsigned long goal,
	301	unsigned long limit)
	302	{
	303	void *ptr;
	304
	305	again:
	306	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
	307	goal, limit);
	308	if (ptr)
	309	return ptr;
	310
	311	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
	312	goal, limit);
	313	if (ptr)
	314	return ptr;
	315
	316	if (goal) {
	317	goal = 0;
	318	goto again;
	319	}
	320
	321	return NULL;
	322	}
	323
	324	void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
	325	unsigned long align, unsigned long goal)
	326	{
	327	if (WARN_ON_ONCE(slab_is_available()))
	328	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	329
	330	return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
	331	}
	332
	333	void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
	334	unsigned long align, unsigned long goal,
	335	unsigned long limit)
	336	{
	337	void *ptr;
	338
	339	ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
	340	if (ptr)
	341	return ptr;
	342
	343	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	344	panic("Out of memory");
	345	return NULL;
	346	}
	347
09325873 YL	348	/**
	349	* __alloc_bootmem_node - allocate boot memory from a specific node
	350	* @pgdat: node to allocate from
	351	* @size: size of the request in bytes
	352	* @align: alignment of the region
	353	* @goal: preferred starting address of the region
	354	*
	355	* The goal is dropped if it can not be satisfied and the allocation will
	356	* fall back to memory below @goal.
	357	*
	358	* Allocation may fall back to any node in the system if the specified node
	359	* can not hold the requested memory.
	360	*
	361	* The function panics if the request can not be satisfied.
	362	*/
	363	void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
	364	unsigned long align, unsigned long goal)
	365	{
09325873 YL	366	if (WARN_ON_ONCE(slab_is_available()))
	367	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	368
ba539868	369	return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
09325873 YL	370	}
	371
	372	void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
	373	unsigned long align, unsigned long goal)
	374	{
09325873	375	return __alloc_bootmem_node(pgdat, size, align, goal);
09325873 YL	376	}
09325873 YL	377
09325873 YL	378	#ifndef ARCH_LOW_ADDRESS_LIMIT
	379	#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
	380	#endif
	381
	382	/**
	383	* __alloc_bootmem_low - allocate low boot memory
	384	* @size: size of the request in bytes
	385	* @align: alignment of the region
	386	* @goal: preferred starting address of the region
	387	*
	388	* The goal is dropped if it can not be satisfied and the allocation will
	389	* fall back to memory below @goal.
	390	*
	391	* Allocation may happen on any node in the system.
	392	*
	393	* The function panics if the request can not be satisfied.
	394	*/
	395	void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
	396	unsigned long goal)
	397	{
	398	return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
	399	}
	400
38fa4175 YL	401	void * __init __alloc_bootmem_low_nopanic(unsigned long size,
	402	unsigned long align,
	403	unsigned long goal)
	404	{
	405	return ___alloc_bootmem_nopanic(size, align, goal,
	406	ARCH_LOW_ADDRESS_LIMIT);
	407	}
	408
09325873 YL	409	/**
	410	* __alloc_bootmem_low_node - allocate low boot memory from a specific node
	411	* @pgdat: node to allocate from
	412	* @size: size of the request in bytes
	413	* @align: alignment of the region
	414	* @goal: preferred starting address of the region
	415	*
	416	* The goal is dropped if it can not be satisfied and the allocation will
	417	* fall back to memory below @goal.
	418	*
	419	* Allocation may fall back to any node in the system if the specified node
	420	* can not hold the requested memory.
	421	*
	422	* The function panics if the request can not be satisfied.
	423	*/
	424	void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
	425	unsigned long align, unsigned long goal)
	426	{
09325873 YL	427	if (WARN_ON_ONCE(slab_is_available()))
	428	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	429
ba539868 JW	430	return ___alloc_bootmem_node(pgdat, size, align, goal,
ba539868 JW	431	ARCH_LOW_ADDRESS_LIMIT);
09325873	432	}