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

	if (memblock_reserve(addr, size))
		return NULL;

	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)
{
	int order;

	while (start < end) {
		order = min(MAX_ORDER - 1UL, __ffs(start));

		while (start + (1UL << order) > end)
			order--;

		__free_pages_bootmem(pfn_to_page(start), order);

		start += (1UL << order);
	}
}

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;
	u64 i;

	memblock_clear_hotplug(0, -1);

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

#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
	{
		phys_addr_t size;

		/* Free memblock.reserved array if it was allocated */
		size = get_allocated_memblock_reserved_regions_info(&start);
		if (size)
			count += __free_memory_core(start, start + size);

		/* Free memblock.memory array if it was allocated */
		size = get_allocated_memblock_memory_regions_info(&start);
		if (size)
			count += __free_memory_core(start, start + size);
	}
#endif

	return count;
}

static int reset_managed_pages_done __initdata;

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

	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;

	if (reset_managed_pages_done)
		return;

	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 NUMA_NO_NODE 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)
{
	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)
{
	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(NUMA_NO_NODE, 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(NUMA_NO_NODE, 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);
}

static 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
87029ee9	44	addr = memblock_find_in_range_node(size, align, goal, limit, nid);
1f5026a7	45	if (!addr)
8bc1f91e YL	46	return NULL;
8bc1f91e YL	47
87379ec8 PH	48	if (memblock_reserve(addr, size))
	49	return NULL;
	50
8bc1f91e YL	51	ptr = phys_to_virt(addr);
8bc1f91e YL	52	memset(ptr, 0, size);
8bc1f91e YL	53	/*
	54	* The min_count is set to 0 so that bootmem allocated blocks
	55	* are never reported as leaks.
	56	*/
	57	kmemleak_alloc(ptr, size, 0, 0);
	58	return ptr;
	59	}
	60
09325873 YL	61	/*
	62	* free_bootmem_late - free bootmem pages directly to page allocator
	63	* @addr: starting address of the range
	64	* @size: size of the range in bytes
	65	*
	66	* This is only useful when the bootmem allocator has already been torn
	67	* down, but we are still initializing the system. Pages are given directly
	68	* to the page allocator, no bootmem metadata is updated because it is gone.
	69	*/
	70	void __init free_bootmem_late(unsigned long addr, unsigned long size)
	71	{
	72	unsigned long cursor, end;
	73
	74	kmemleak_free_part(__va(addr), size);
	75
	76	cursor = PFN_UP(addr);
	77	end = PFN_DOWN(addr + size);
	78
	79	for (; cursor < end; cursor++) {
	80	__free_pages_bootmem(pfn_to_page(cursor), 0);
	81	totalram_pages++;
	82	}
	83	}
	84
	85	static void __init __free_pages_memory(unsigned long start, unsigned long end)
	86	{
309d0b39	87	int order;
09325873	88
309d0b39 RH	89	while (start < end) {
309d0b39 RH	90	order = min(MAX_ORDER - 1UL, __ffs(start));
09325873	91
309d0b39 RH	92	while (start + (1UL << order) > end)
309d0b39 RH	93	order--;
09325873	94
309d0b39	95	__free_pages_bootmem(pfn_to_page(start), order);
09325873	96
309d0b39 RH	97	start += (1UL << order);
309d0b39 RH	98	}
09325873 YL	99	}
09325873 YL	100
29f67386 YL	101	static unsigned long __init __free_memory_core(phys_addr_t start,
	102	phys_addr_t end)
	103	{
	104	unsigned long start_pfn = PFN_UP(start);
	105	unsigned long end_pfn = min_t(unsigned long,
	106	PFN_DOWN(end), max_low_pfn);
	107
	108	if (start_pfn > end_pfn)
	109	return 0;
	110
	111	__free_pages_memory(start_pfn, end_pfn);
	112
	113	return end_pfn - start_pfn;
	114	}
	115
b4def350	116	static unsigned long __init free_low_memory_core_early(void)
09325873	117	{
09325873	118	unsigned long count = 0;
354f17e1	119	phys_addr_t start, end;
8a9ca34c TH	120	u64 i;
8a9ca34c TH	121
0a313a99 XQ	122	memblock_clear_hotplug(0, -1);
0a313a99 XQ	123
b1154233	124	for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL)
29f67386 YL	125	count += __free_memory_core(start, end);
29f67386 YL	126
5e270e25	127	#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
354f17e1 PH	128	{
	129	phys_addr_t size;
	130
	131	/* Free memblock.reserved array if it was allocated */
	132	size = get_allocated_memblock_reserved_regions_info(&start);
	133	if (size)
	134	count += __free_memory_core(start, start + size);
	135
	136	/* Free memblock.memory array if it was allocated */
	137	size = get_allocated_memblock_memory_regions_info(&start);
	138	if (size)
	139	count += __free_memory_core(start, start + size);
	140	}
5e270e25 PH	141	#endif
5e270e25 PH	142
09325873 YL	143	return count;
	144	}
	145
7b4b2a0d JL	146	static int reset_managed_pages_done __initdata;
7b4b2a0d JL	147
f784a3f1	148	void reset_node_managed_pages(pg_data_t *pgdat)
9feedc9d JL	149	{
	150	struct zone *z;
	151
9feedc9d	152	for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
7b4b2a0d JL	153	z->managed_pages = 0;
	154	}
	155
	156	void __init reset_all_zones_managed_pages(void)
	157	{
	158	struct pglist_data *pgdat;
	159
f784a3f1 TC	160	if (reset_managed_pages_done)
	161	return;
	162
7b4b2a0d JL	163	for_each_online_pgdat(pgdat)
7b4b2a0d JL	164	reset_node_managed_pages(pgdat);
f784a3f1	165
7b4b2a0d	166	reset_managed_pages_done = 1;
9feedc9d JL	167	}
9feedc9d JL	168
09325873 YL	169	/**
	170	* free_all_bootmem - release free pages to the buddy allocator
	171	*
	172	* Returns the number of pages actually released.
	173	*/
	174	unsigned long __init free_all_bootmem(void)
	175	{
0c988534 JL	176	unsigned long pages;
0c988534 JL	177
7b4b2a0d	178	reset_all_zones_managed_pages();
9feedc9d	179
09325873	180	/*
b1154233	181	* We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
25985edc	182	* because in some case like Node0 doesn't have RAM installed
09325873	183	* low ram will be on Node1
09325873	184	*/
0c988534 JL	185	pages = free_low_memory_core_early();
	186	totalram_pages += pages;
	187
	188	return pages;
09325873 YL	189	}
	190
	191	/**
	192	* free_bootmem_node - mark a page range as usable
	193	* @pgdat: node the range resides on
	194	* @physaddr: starting address of the range
	195	* @size: size of the range in bytes
	196	*
	197	* Partial pages will be considered reserved and left as they are.
	198	*
	199	* The range must reside completely on the specified node.
	200	*/
	201	void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
	202	unsigned long size)
	203	{
24aa0788	204	memblock_free(physaddr, size);
09325873 YL	205	}
	206
	207	/**
	208	* free_bootmem - mark a page range as usable
	209	* @addr: starting address of the range
	210	* @size: size of the range in bytes
	211	*
	212	* Partial pages will be considered reserved and left as they are.
	213	*
	214	* The range must be contiguous but may span node boundaries.
	215	*/
	216	void __init free_bootmem(unsigned long addr, unsigned long size)
	217	{
24aa0788	218	memblock_free(addr, size);
09325873 YL	219	}
	220
	221	static void * __init ___alloc_bootmem_nopanic(unsigned long size,
	222	unsigned long align,
	223	unsigned long goal,
	224	unsigned long limit)
	225	{
	226	void *ptr;
	227
	228	if (WARN_ON_ONCE(slab_is_available()))
	229	return kzalloc(size, GFP_NOWAIT);
	230
	231	restart:
	232
b1154233	233	ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
09325873 YL	234
	235	if (ptr)
	236	return ptr;
	237
	238	if (goal != 0) {
	239	goal = 0;
	240	goto restart;
	241	}
	242
	243	return NULL;
	244	}
	245
	246	/**
	247	* __alloc_bootmem_nopanic - allocate boot memory without panicking
	248	* @size: size of the request in bytes
	249	* @align: alignment of the region
	250	* @goal: preferred starting address of the region
	251	*
	252	* The goal is dropped if it can not be satisfied and the allocation will
	253	* fall back to memory below @goal.
	254	*
	255	* Allocation may happen on any node in the system.
	256	*
	257	* Returns NULL on failure.
	258	*/
	259	void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
	260	unsigned long goal)
	261	{
	262	unsigned long limit = -1UL;
	263
	264	return ___alloc_bootmem_nopanic(size, align, goal, limit);
	265	}
	266
	267	static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
	268	unsigned long goal, unsigned long limit)
	269	{
	270	void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
	271
	272	if (mem)
	273	return mem;
	274	/*
	275	* Whoops, we cannot satisfy the allocation request.
	276	*/
	277	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	278	panic("Out of memory");
	279	return NULL;
	280	}
	281
	282	/**
	283	* __alloc_bootmem - allocate boot memory
	284	* @size: size of the request in bytes
	285	* @align: alignment of the region
	286	* @goal: preferred starting address of the region
	287	*
	288	* The goal is dropped if it can not be satisfied and the allocation will
	289	* fall back to memory below @goal.
	290	*
	291	* Allocation may happen on any node in the system.
	292	*
	293	* The function panics if the request can not be satisfied.
	294	*/
	295	void * __init __alloc_bootmem(unsigned long size, unsigned long align,
	296	unsigned long goal)
	297	{
298	unsigned long limit = -1UL;
299
300	return ___alloc_bootmem(size, align, goal, limit);
301	}
302
99ab7b19	303	void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
ba539868 JW	304	unsigned long size,
	305	unsigned long align,
	306	unsigned long goal,
	307	unsigned long limit)
	308	{
	309	void *ptr;
	310
	311	again:
	312	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
	313	goal, limit);
	314	if (ptr)
	315	return ptr;
	316
b1154233	317	ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
ba539868 JW	318	goal, limit);
	319	if (ptr)
	320	return ptr;
	321
	322	if (goal) {
	323	goal = 0;
	324	goto again;
	325	}
	326
	327	return NULL;
	328	}
	329
	330	void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
	331	unsigned long align, unsigned long goal)
	332	{
	333	if (WARN_ON_ONCE(slab_is_available()))
	334	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	335
	336	return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
	337	}
	338
de498507	339	static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
ba539868 JW	340	unsigned long align, unsigned long goal,
	341	unsigned long limit)
	342	{
	343	void *ptr;
	344
	345	ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
	346	if (ptr)
	347	return ptr;
	348
	349	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	350	panic("Out of memory");
	351	return NULL;
	352	}
	353
09325873 YL	354	/**
	355	* __alloc_bootmem_node - allocate boot memory from a specific node
	356	* @pgdat: node to allocate from
	357	* @size: size of the request in bytes
	358	* @align: alignment of the region
	359	* @goal: preferred starting address of the region
	360	*
	361	* The goal is dropped if it can not be satisfied and the allocation will
	362	* fall back to memory below @goal.
	363	*
	364	* Allocation may fall back to any node in the system if the specified node
	365	* can not hold the requested memory.
	366	*
	367	* The function panics if the request can not be satisfied.
	368	*/
	369	void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
	370	unsigned long align, unsigned long goal)
	371	{
09325873 YL	372	if (WARN_ON_ONCE(slab_is_available()))
	373	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	374
ba539868	375	return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
09325873 YL	376	}
	377
	378	void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
	379	unsigned long align, unsigned long goal)
	380	{
09325873	381	return __alloc_bootmem_node(pgdat, size, align, goal);
09325873 YL	382	}
09325873 YL	383
09325873 YL	384	#ifndef ARCH_LOW_ADDRESS_LIMIT
	385	#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
	386	#endif
	387
	388	/**
	389	* __alloc_bootmem_low - allocate low boot memory
	390	* @size: size of the request in bytes
	391	* @align: alignment of the region
	392	* @goal: preferred starting address of the region
	393	*
	394	* The goal is dropped if it can not be satisfied and the allocation will
	395	* fall back to memory below @goal.
	396	*
	397	* Allocation may happen on any node in the system.
	398	*
	399	* The function panics if the request can not be satisfied.
	400	*/
	401	void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
	402	unsigned long goal)
	403	{
	404	return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
	405	}
	406
38fa4175 YL	407	void * __init __alloc_bootmem_low_nopanic(unsigned long size,
	408	unsigned long align,
	409	unsigned long goal)
	410	{
	411	return ___alloc_bootmem_nopanic(size, align, goal,
	412	ARCH_LOW_ADDRESS_LIMIT);
	413	}
	414
09325873 YL	415	/**
	416	* __alloc_bootmem_low_node - allocate low boot memory from a specific node
	417	* @pgdat: node to allocate from
	418	* @size: size of the request in bytes
	419	* @align: alignment of the region
	420	* @goal: preferred starting address of the region
	421	*
	422	* The goal is dropped if it can not be satisfied and the allocation will
	423	* fall back to memory below @goal.
	424	*
	425	* Allocation may fall back to any node in the system if the specified node
	426	* can not hold the requested memory.
	427	*
	428	* The function panics if the request can not be satisfied.
	429	*/
	430	void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
	431	unsigned long align, unsigned long goal)
	432	{
09325873 YL	433	if (WARN_ON_ONCE(slab_is_available()))
	434	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	435
ba539868 JW	436	return ___alloc_bootmem_node(pgdat, size, align, goal,
ba539868 JW	437	ARCH_LOW_ADDRESS_LIMIT);
09325873	438	}