[mirror_ubuntu-zesty-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(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;

	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;

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 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)
{
	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(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);
}

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
b1154233	122	for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL)
29f67386 YL	123	count += __free_memory_core(start, end);
29f67386 YL	124
5e270e25	125	#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
354f17e1 PH	126	{
	127	phys_addr_t size;
	128
	129	/* Free memblock.reserved array if it was allocated */
	130	size = get_allocated_memblock_reserved_regions_info(&start);
	131	if (size)
	132	count += __free_memory_core(start, start + size);
	133
	134	/* Free memblock.memory array if it was allocated */
	135	size = get_allocated_memblock_memory_regions_info(&start);
	136	if (size)
	137	count += __free_memory_core(start, start + size);
	138	}
5e270e25 PH	139	#endif
5e270e25 PH	140
09325873 YL	141	return count;
	142	}
	143
7b4b2a0d JL	144	static int reset_managed_pages_done __initdata;
	145
	146	static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
9feedc9d JL	147	{
	148	struct zone *z;
	149
7b4b2a0d JL	150	if (reset_managed_pages_done)
7b4b2a0d JL	151	return;
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
	160	for_each_online_pgdat(pgdat)
	161	reset_node_managed_pages(pgdat);
	162	reset_managed_pages_done = 1;
9feedc9d JL	163	}
9feedc9d JL	164
09325873 YL	165	/**
	166	* free_all_bootmem - release free pages to the buddy allocator
	167	*
	168	* Returns the number of pages actually released.
	169	*/
	170	unsigned long __init free_all_bootmem(void)
	171	{
0c988534 JL	172	unsigned long pages;
0c988534 JL	173
7b4b2a0d	174	reset_all_zones_managed_pages();
9feedc9d	175
09325873	176	/*
b1154233	177	* We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
25985edc	178	* because in some case like Node0 doesn't have RAM installed
09325873	179	* low ram will be on Node1
09325873	180	*/
0c988534 JL	181	pages = free_low_memory_core_early();
	182	totalram_pages += pages;
	183
	184	return pages;
09325873 YL	185	}
	186
	187	/**
	188	* free_bootmem_node - mark a page range as usable
	189	* @pgdat: node the range resides on
	190	* @physaddr: starting address of the range
	191	* @size: size of the range in bytes
	192	*
	193	* Partial pages will be considered reserved and left as they are.
	194	*
	195	* The range must reside completely on the specified node.
	196	*/
	197	void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
	198	unsigned long size)
	199	{
	200	kmemleak_free_part(__va(physaddr), size);
24aa0788	201	memblock_free(physaddr, size);
09325873 YL	202	}
	203
	204	/**
	205	* free_bootmem - mark a page range as usable
	206	* @addr: starting address of the range
	207	* @size: size of the range in bytes
	208	*
	209	* Partial pages will be considered reserved and left as they are.
	210	*
	211	* The range must be contiguous but may span node boundaries.
	212	*/
	213	void __init free_bootmem(unsigned long addr, unsigned long size)
	214	{
	215	kmemleak_free_part(__va(addr), size);
24aa0788	216	memblock_free(addr, size);
09325873 YL	217	}
	218
	219	static void * __init ___alloc_bootmem_nopanic(unsigned long size,
	220	unsigned long align,
	221	unsigned long goal,
	222	unsigned long limit)
	223	{
	224	void *ptr;
	225
	226	if (WARN_ON_ONCE(slab_is_available()))
	227	return kzalloc(size, GFP_NOWAIT);
	228
	229	restart:
	230
b1154233	231	ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
09325873 YL	232
	233	if (ptr)
	234	return ptr;
	235
	236	if (goal != 0) {
	237	goal = 0;
	238	goto restart;
	239	}
	240
	241	return NULL;
	242	}
	243
	244	/**
	245	* __alloc_bootmem_nopanic - allocate boot memory without panicking
	246	* @size: size of the request in bytes
	247	* @align: alignment of the region
	248	* @goal: preferred starting address of the region
	249	*
	250	* The goal is dropped if it can not be satisfied and the allocation will
	251	* fall back to memory below @goal.
	252	*
	253	* Allocation may happen on any node in the system.
	254	*
	255	* Returns NULL on failure.
	256	*/
	257	void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
	258	unsigned long goal)
	259	{
	260	unsigned long limit = -1UL;
	261
	262	return ___alloc_bootmem_nopanic(size, align, goal, limit);
	263	}
	264
	265	static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
	266	unsigned long goal, unsigned long limit)
	267	{
	268	void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
	269
	270	if (mem)
	271	return mem;
	272	/*
	273	* Whoops, we cannot satisfy the allocation request.
	274	*/
	275	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	276	panic("Out of memory");
	277	return NULL;
	278	}
	279
	280	/**
	281	* __alloc_bootmem - allocate boot memory
	282	* @size: size of the request in bytes
	283	* @align: alignment of the region
	284	* @goal: preferred starting address of the region
	285	*
	286	* The goal is dropped if it can not be satisfied and the allocation will
	287	* fall back to memory below @goal.
	288	*
	289	* Allocation may happen on any node in the system.
	290	*
	291	* The function panics if the request can not be satisfied.
	292	*/
	293	void * __init __alloc_bootmem(unsigned long size, unsigned long align,
	294	unsigned long goal)
	295	{
296	unsigned long limit = -1UL;
297
298	return ___alloc_bootmem(size, align, goal, limit);
299	}
300
99ab7b19	301	void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
ba539868 JW	302	unsigned long size,
	303	unsigned long align,
	304	unsigned long goal,
	305	unsigned long limit)
	306	{
	307	void *ptr;
	308
	309	again:
	310	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
	311	goal, limit);
	312	if (ptr)
	313	return ptr;
	314
b1154233	315	ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
ba539868 JW	316	goal, limit);
	317	if (ptr)
	318	return ptr;
	319
	320	if (goal) {
	321	goal = 0;
	322	goto again;
	323	}
	324
	325	return NULL;
	326	}
	327
	328	void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
	329	unsigned long align, unsigned long goal)
	330	{
	331	if (WARN_ON_ONCE(slab_is_available()))
	332	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	333
	334	return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
	335	}
	336
	337	void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
	338	unsigned long align, unsigned long goal,
	339	unsigned long limit)
	340	{
	341	void *ptr;
	342
	343	ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
	344	if (ptr)
	345	return ptr;
	346
	347	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	348	panic("Out of memory");
	349	return NULL;
	350	}
	351
09325873 YL	352	/**
	353	* __alloc_bootmem_node - allocate boot memory from a specific node
	354	* @pgdat: node to allocate from
	355	* @size: size of the request in bytes
	356	* @align: alignment of the region
	357	* @goal: preferred starting address of the region
	358	*
	359	* The goal is dropped if it can not be satisfied and the allocation will
	360	* fall back to memory below @goal.
	361	*
	362	* Allocation may fall back to any node in the system if the specified node
	363	* can not hold the requested memory.
	364	*
	365	* The function panics if the request can not be satisfied.
	366	*/
	367	void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
	368	unsigned long align, unsigned long goal)
	369	{
09325873 YL	370	if (WARN_ON_ONCE(slab_is_available()))
	371	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	372
ba539868	373	return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
09325873 YL	374	}
	375
	376	void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
	377	unsigned long align, unsigned long goal)
	378	{
09325873	379	return __alloc_bootmem_node(pgdat, size, align, goal);
09325873 YL	380	}
09325873 YL	381
09325873 YL	382	#ifndef ARCH_LOW_ADDRESS_LIMIT
	383	#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
	384	#endif
	385
	386	/**
	387	* __alloc_bootmem_low - allocate low boot memory
	388	* @size: size of the request in bytes
	389	* @align: alignment of the region
	390	* @goal: preferred starting address of the region
	391	*
	392	* The goal is dropped if it can not be satisfied and the allocation will
	393	* fall back to memory below @goal.
	394	*
	395	* Allocation may happen on any node in the system.
	396	*
	397	* The function panics if the request can not be satisfied.
	398	*/
	399	void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
	400	unsigned long goal)
	401	{
	402	return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
	403	}
	404
38fa4175 YL	405	void * __init __alloc_bootmem_low_nopanic(unsigned long size,
	406	unsigned long align,
	407	unsigned long goal)
	408	{
	409	return ___alloc_bootmem_nopanic(size, align, goal,
	410	ARCH_LOW_ADDRESS_LIMIT);
	411	}
	412
09325873 YL	413	/**
	414	* __alloc_bootmem_low_node - allocate low boot memory from a specific node
	415	* @pgdat: node to allocate from
	416	* @size: size of the request in bytes
	417	* @align: alignment of the region
	418	* @goal: preferred starting address of the region
	419	*
	420	* The goal is dropped if it can not be satisfied and the allocation will
	421	* fall back to memory below @goal.
	422	*
	423	* Allocation may fall back to any node in the system if the specified node
	424	* can not hold the requested memory.
	425	*
	426	* The function panics if the request can not be satisfied.
	427	*/
	428	void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
	429	unsigned long align, unsigned long goal)
	430	{
09325873 YL	431	if (WARN_ON_ONCE(slab_is_available()))
	432	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	433
ba539868 JW	434	return ___alloc_bootmem_node(pgdat, size, align, goal,
ba539868 JW	435	ARCH_LOW_ADDRESS_LIMIT);
09325873	436	}