[mirror_ubuntu-artful-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, size;
	u64 i;

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

	/* 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);

#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK

	/* 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;
29f67386	119	phys_addr_t start, end, size;
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	/* Free memblock.reserved array if it was allocated */
29f67386 YL	126	size = get_allocated_memblock_reserved_regions_info(&start);
	127	if (size)
	128	count += __free_memory_core(start, start + size);
09325873	129
5e270e25 PH	130	#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
	131
	132	/* Free memblock.memory array if it was allocated */
	133	size = get_allocated_memblock_memory_regions_info(&start);
	134	if (size)
	135	count += __free_memory_core(start, start + size);
	136	#endif
	137
09325873 YL	138	return count;
	139	}
	140
7b4b2a0d JL	141	static int reset_managed_pages_done __initdata;
	142
	143	static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
9feedc9d JL	144	{
	145	struct zone *z;
	146
7b4b2a0d JL	147	if (reset_managed_pages_done)
7b4b2a0d JL	148	return;
9feedc9d	149	for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
7b4b2a0d JL	150	z->managed_pages = 0;
	151	}
	152
	153	void __init reset_all_zones_managed_pages(void)
	154	{
	155	struct pglist_data *pgdat;
	156
	157	for_each_online_pgdat(pgdat)
	158	reset_node_managed_pages(pgdat);
	159	reset_managed_pages_done = 1;
9feedc9d JL	160	}
9feedc9d JL	161
09325873 YL	162	/**
	163	* free_all_bootmem - release free pages to the buddy allocator
	164	*
	165	* Returns the number of pages actually released.
	166	*/
	167	unsigned long __init free_all_bootmem(void)
	168	{
0c988534 JL	169	unsigned long pages;
0c988534 JL	170
7b4b2a0d	171	reset_all_zones_managed_pages();
9feedc9d	172
09325873	173	/*
b1154233	174	* We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
25985edc	175	* because in some case like Node0 doesn't have RAM installed
09325873	176	* low ram will be on Node1
09325873	177	*/
0c988534 JL	178	pages = free_low_memory_core_early();
	179	totalram_pages += pages;
	180
	181	return pages;
09325873 YL	182	}
	183
	184	/**
	185	* free_bootmem_node - mark a page range as usable
	186	* @pgdat: node the range resides on
	187	* @physaddr: starting address of the range
	188	* @size: size of the range in bytes
	189	*
	190	* Partial pages will be considered reserved and left as they are.
	191	*
	192	* The range must reside completely on the specified node.
	193	*/
	194	void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
	195	unsigned long size)
	196	{
	197	kmemleak_free_part(__va(physaddr), size);
24aa0788	198	memblock_free(physaddr, size);
09325873 YL	199	}
	200
	201	/**
	202	* free_bootmem - mark a page range as usable
	203	* @addr: starting address of the range
	204	* @size: size of the range in bytes
	205	*
	206	* Partial pages will be considered reserved and left as they are.
	207	*
	208	* The range must be contiguous but may span node boundaries.
	209	*/
	210	void __init free_bootmem(unsigned long addr, unsigned long size)
	211	{
	212	kmemleak_free_part(__va(addr), size);
24aa0788	213	memblock_free(addr, size);
09325873 YL	214	}
	215
	216	static void * __init ___alloc_bootmem_nopanic(unsigned long size,
	217	unsigned long align,
	218	unsigned long goal,
	219	unsigned long limit)
	220	{
	221	void *ptr;
	222
	223	if (WARN_ON_ONCE(slab_is_available()))
	224	return kzalloc(size, GFP_NOWAIT);
	225
	226	restart:
	227
b1154233	228	ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
09325873 YL	229
	230	if (ptr)
	231	return ptr;
	232
	233	if (goal != 0) {
	234	goal = 0;
	235	goto restart;
	236	}
	237
	238	return NULL;
	239	}
	240
	241	/**
	242	* __alloc_bootmem_nopanic - allocate boot memory without panicking
	243	* @size: size of the request in bytes
	244	* @align: alignment of the region
	245	* @goal: preferred starting address of the region
	246	*
	247	* The goal is dropped if it can not be satisfied and the allocation will
	248	* fall back to memory below @goal.
	249	*
	250	* Allocation may happen on any node in the system.
	251	*
	252	* Returns NULL on failure.
	253	*/
	254	void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
	255	unsigned long goal)
	256	{
	257	unsigned long limit = -1UL;
	258
	259	return ___alloc_bootmem_nopanic(size, align, goal, limit);
	260	}
	261
	262	static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
	263	unsigned long goal, unsigned long limit)
	264	{
	265	void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
	266
	267	if (mem)
	268	return mem;
	269	/*
	270	* Whoops, we cannot satisfy the allocation request.
	271	*/
	272	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	273	panic("Out of memory");
	274	return NULL;
	275	}
	276
	277	/**
	278	* __alloc_bootmem - allocate boot memory
	279	* @size: size of the request in bytes
	280	* @align: alignment of the region
	281	* @goal: preferred starting address of the region
	282	*
	283	* The goal is dropped if it can not be satisfied and the allocation will
	284	* fall back to memory below @goal.
	285	*
	286	* Allocation may happen on any node in the system.
	287	*
	288	* The function panics if the request can not be satisfied.
	289	*/
	290	void * __init __alloc_bootmem(unsigned long size, unsigned long align,
	291	unsigned long goal)
	292	{
293	unsigned long limit = -1UL;
294
295	return ___alloc_bootmem(size, align, goal, limit);
296	}
297
99ab7b19	298	void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
ba539868 JW	299	unsigned long size,
	300	unsigned long align,
	301	unsigned long goal,
	302	unsigned long limit)
	303	{
	304	void *ptr;
	305
	306	again:
	307	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
	308	goal, limit);
	309	if (ptr)
	310	return ptr;
	311
b1154233	312	ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
ba539868 JW	313	goal, limit);
	314	if (ptr)
	315	return ptr;
	316
	317	if (goal) {
	318	goal = 0;
	319	goto again;
	320	}
	321
	322	return NULL;
	323	}
	324
	325	void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
	326	unsigned long align, unsigned long goal)
	327	{
	328	if (WARN_ON_ONCE(slab_is_available()))
	329	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	330
	331	return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
	332	}
	333
	334	void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
	335	unsigned long align, unsigned long goal,
	336	unsigned long limit)
	337	{
	338	void *ptr;
	339
	340	ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
	341	if (ptr)
	342	return ptr;
	343
	344	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	345	panic("Out of memory");
	346	return NULL;
	347	}
	348
09325873 YL	349	/**
	350	* __alloc_bootmem_node - allocate boot memory from a specific node
	351	* @pgdat: node to allocate from
	352	* @size: size of the request in bytes
	353	* @align: alignment of the region
	354	* @goal: preferred starting address of the region
	355	*
	356	* The goal is dropped if it can not be satisfied and the allocation will
	357	* fall back to memory below @goal.
	358	*
	359	* Allocation may fall back to any node in the system if the specified node
	360	* can not hold the requested memory.
	361	*
	362	* The function panics if the request can not be satisfied.
	363	*/
	364	void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
	365	unsigned long align, unsigned long goal)
	366	{
09325873 YL	367	if (WARN_ON_ONCE(slab_is_available()))
	368	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	369
ba539868	370	return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
09325873 YL	371	}
	372
	373	void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
	374	unsigned long align, unsigned long goal)
	375	{
09325873	376	return __alloc_bootmem_node(pgdat, size, align, goal);
09325873 YL	377	}
09325873 YL	378
09325873 YL	379	#ifndef ARCH_LOW_ADDRESS_LIMIT
	380	#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
	381	#endif
	382
	383	/**
	384	* __alloc_bootmem_low - allocate low boot memory
	385	* @size: size of the request in bytes
	386	* @align: alignment of the region
	387	* @goal: preferred starting address of the region
	388	*
	389	* The goal is dropped if it can not be satisfied and the allocation will
	390	* fall back to memory below @goal.
	391	*
	392	* Allocation may happen on any node in the system.
	393	*
	394	* The function panics if the request can not be satisfied.
	395	*/
	396	void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
	397	unsigned long goal)
	398	{
	399	return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
	400	}
	401
38fa4175 YL	402	void * __init __alloc_bootmem_low_nopanic(unsigned long size,
	403	unsigned long align,
	404	unsigned long goal)
	405	{
	406	return ___alloc_bootmem_nopanic(size, align, goal,
	407	ARCH_LOW_ADDRESS_LIMIT);
	408	}
	409
09325873 YL	410	/**
	411	* __alloc_bootmem_low_node - allocate low boot memory from a specific node
	412	* @pgdat: node to allocate from
	413	* @size: size of the request in bytes
	414	* @align: alignment of the region
	415	* @goal: preferred starting address of the region
	416	*
	417	* The goal is dropped if it can not be satisfied and the allocation will
	418	* fall back to memory below @goal.
	419	*
	420	* Allocation may fall back to any node in the system if the specified node
	421	* can not hold the requested memory.
	422	*
	423	* The function panics if the request can not be satisfied.
	424	*/
	425	void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
	426	unsigned long align, unsigned long goal)
	427	{
09325873 YL	428	if (WARN_ON_ONCE(slab_is_available()))
	429	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	430
ba539868 JW	431	return ___alloc_bootmem_node(pgdat, size, align, goal,
ba539868 JW	432	ARCH_LOW_ADDRESS_LIMIT);
09325873	433	}