[deliverable/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;

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