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

	ptr = phys_to_virt(addr);
	memset(ptr, 0, size);
	memblock_reserve(addr, size);
	/*
	 * The min_count is set to 0 so that bootmem allocated blocks
	 * are never reported as leaks.
	 */
	kmemleak_alloc(ptr, size, 0, 0);
	return ptr;
}

/*
 * free_bootmem_late - free bootmem pages directly to page allocator
 * @addr: starting address of the range
 * @size: size of the range in bytes
 *
 * This is only useful when the bootmem allocator has already been torn
 * down, but we are still initializing the system.  Pages are given directly
 * to the page allocator, no bootmem metadata is updated because it is gone.
 */
void __init free_bootmem_late(unsigned long addr, unsigned long size)
{
	unsigned long cursor, end;

	kmemleak_free_part(__va(addr), size);

	cursor = PFN_UP(addr);
	end = PFN_DOWN(addr + size);

	for (; cursor < end; cursor++) {
		__free_pages_bootmem(pfn_to_page(cursor), 0);
		totalram_pages++;
	}
}

static void __init __free_pages_memory(unsigned long start, unsigned long end)
{
	unsigned long i, start_aligned, end_aligned;
	int order = ilog2(BITS_PER_LONG);

	start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
	end_aligned = end & ~(BITS_PER_LONG - 1);

	if (end_aligned <= start_aligned) {
		for (i = start; i < end; i++)
			__free_pages_bootmem(pfn_to_page(i), 0);

		return;
	}

	for (i = start; i < start_aligned; i++)
		__free_pages_bootmem(pfn_to_page(i), 0);

	for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
		__free_pages_bootmem(pfn_to_page(i), order);

	for (i = end_aligned; i < end; i++)
		__free_pages_bootmem(pfn_to_page(i), 0);
}

static unsigned long __init __free_memory_core(phys_addr_t start,
				 phys_addr_t end)
{
	unsigned long start_pfn = PFN_UP(start);
	unsigned long end_pfn = min_t(unsigned long,
				      PFN_DOWN(end), max_low_pfn);

	if (start_pfn > end_pfn)
		return 0;

	__free_pages_memory(start_pfn, end_pfn);

	return end_pfn - start_pfn;
}

unsigned long __init free_low_memory_core_early(int nodeid)
{
	unsigned long count = 0;
	phys_addr_t start, end, size;
	u64 i;

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

	/* free range that is used for reserved array if we allocate it */
	size = get_allocated_memblock_reserved_regions_info(&start);
	if (size)
		count += __free_memory_core(start, start + size);

	return count;
}

/**
 * free_all_bootmem_node - release a node's free pages to the buddy allocator
 * @pgdat: node to be released
 *
 * Returns the number of pages actually released.
 */
unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
{
	register_page_bootmem_info_node(pgdat);

	/* free_low_memory_core_early(MAX_NUMNODES) will be called later */
	return 0;
}

/**
 * free_all_bootmem - release free pages to the buddy allocator
 *
 * Returns the number of pages actually released.
 */
unsigned long __init free_all_bootmem(void)
{
	/*
	 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
	 *  because in some case like Node0 doesn't have RAM installed
	 *  low ram will be on Node1
	 */
	return free_low_memory_core_early(MAX_NUMNODES);
}

/**
 * free_bootmem_node - mark a page range as usable
 * @pgdat: node the range resides on
 * @physaddr: starting address of the range
 * @size: size of the range in bytes
 *
 * Partial pages will be considered reserved and left as they are.
 *
 * The range must reside completely on the specified node.
 */
void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
			      unsigned long size)
{
	kmemleak_free_part(__va(physaddr), size);
	memblock_free(physaddr, size);
}

/**
 * free_bootmem - mark a page range as usable
 * @addr: starting address of the range
 * @size: size of the range in bytes
 *
 * Partial pages will be considered reserved and left as they are.
 *
 * The range must be contiguous but may span node boundaries.
 */
void __init free_bootmem(unsigned long addr, unsigned long size)
{
	kmemleak_free_part(__va(addr), size);
	memblock_free(addr, size);
}

static void * __init ___alloc_bootmem_nopanic(unsigned long size,
					unsigned long align,
					unsigned long goal,
					unsigned long limit)
{
	void *ptr;

	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc(size, GFP_NOWAIT);

restart:

	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);

	if (ptr)
		return ptr;

	if (goal != 0) {
		goal = 0;
		goto restart;
	}

	return NULL;
}

/**
 * __alloc_bootmem_nopanic - allocate boot memory without panicking
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may happen on any node in the system.
 *
 * Returns NULL on failure.
 */
void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
					unsigned long goal)
{
	unsigned long limit = -1UL;

	return ___alloc_bootmem_nopanic(size, align, goal, limit);
}

static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
					unsigned long goal, unsigned long limit)
{
	void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);

	if (mem)
		return mem;
	/*
	 * Whoops, we cannot satisfy the allocation request.
	 */
	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	panic("Out of memory");
	return NULL;
}

/**
 * __alloc_bootmem - allocate boot memory
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may happen on any node in the system.
 *
 * The function panics if the request can not be satisfied.
 */
void * __init __alloc_bootmem(unsigned long size, unsigned long align,
			      unsigned long goal)
{
	unsigned long limit = -1UL;

	return ___alloc_bootmem(size, align, goal, limit);
}

void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
						   unsigned long size,
						   unsigned long align,
						   unsigned long goal,
						   unsigned long limit)
{
	void *ptr;

again:
	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
					goal, limit);
	if (ptr)
		return ptr;

	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
					goal, limit);
	if (ptr)
		return ptr;

	if (goal) {
		goal = 0;
		goto again;
	}

	return NULL;
}

void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
				   unsigned long align, unsigned long goal)
{
	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

	return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
}

void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
				    unsigned long align, unsigned long goal,
				    unsigned long limit)
{
	void *ptr;

	ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
	if (ptr)
		return ptr;

	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	panic("Out of memory");
	return NULL;
}

/**
 * __alloc_bootmem_node - allocate boot memory from a specific node
 * @pgdat: node to allocate from
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may fall back to any node in the system if the specified node
 * can not hold the requested memory.
 *
 * The function panics if the request can not be satisfied.
 */
void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
				   unsigned long align, unsigned long goal)
{
	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

	return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
}

void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
				   unsigned long align, unsigned long goal)
{
	return __alloc_bootmem_node(pgdat, size, align, goal);
}

#ifndef ARCH_LOW_ADDRESS_LIMIT
#define ARCH_LOW_ADDRESS_LIMIT	0xffffffffUL
#endif

/**
 * __alloc_bootmem_low - allocate low boot memory
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may happen on any node in the system.
 *
 * The function panics if the request can not be satisfied.
 */
void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
				  unsigned long goal)
{
	return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
}

/**
 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 * @pgdat: node to allocate from
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may fall back to any node in the system if the specified node
 * can not hold the requested memory.
 *
 * The function panics if the request can not be satisfied.
 */
void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
				       unsigned long align, unsigned long goal)
{
	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

	return ___alloc_bootmem_node(pgdat, size, align, goal,
				     ARCH_LOW_ADDRESS_LIMIT);
}
Commit	Line	Data
09325873 YL	1	/*
	2	* bootmem - A boot-time physical memory allocator and configurator
	3	*
	4	* Copyright (C) 1999 Ingo Molnar
	5	* 1999 Kanoj Sarcar, SGI
	6	* 2008 Johannes Weiner
	7	*
	8	* Access to this subsystem has to be serialized externally (which is true
	9	* for the boot process anyway).
	10	*/
	11	#include <linux/init.h>
	12	#include <linux/pfn.h>
	13	#include <linux/slab.h>
	14	#include <linux/bootmem.h>
b95f1b31	15	#include <linux/export.h>
09325873 YL	16	#include <linux/kmemleak.h>
	17	#include <linux/range.h>
	18	#include <linux/memblock.h>
	19
	20	#include <asm/bug.h>
	21	#include <asm/io.h>
	22	#include <asm/processor.h>
	23
	24	#include "internal.h"
	25
e782ab42 YL	26	#ifndef CONFIG_NEED_MULTIPLE_NODES
	27	struct pglist_data __refdata contig_page_data;
	28	EXPORT_SYMBOL(contig_page_data);
	29	#endif
	30
09325873 YL	31	unsigned long max_low_pfn;
	32	unsigned long min_low_pfn;
	33	unsigned long max_pfn;
	34
8bc1f91e YL	35	static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
	36	u64 goal, u64 limit)
	37	{
	38	void *ptr;
	39	u64 addr;
	40
	41	if (limit > memblock.current_limit)
	42	limit = memblock.current_limit;
	43
eb40c4c2	44	addr = memblock_find_in_range_node(goal, limit, size, align, nid);
1f5026a7	45	if (!addr)
8bc1f91e YL	46	return NULL;
	47
	48	ptr = phys_to_virt(addr);
	49	memset(ptr, 0, size);
24aa0788	50	memblock_reserve(addr, size);
8bc1f91e YL	51	/*
	52	* The min_count is set to 0 so that bootmem allocated blocks
	53	* are never reported as leaks.
	54	*/
	55	kmemleak_alloc(ptr, size, 0, 0);
	56	return ptr;
	57	}
	58
09325873 YL	59	/*
	60	* free_bootmem_late - free bootmem pages directly to page allocator
	61	* @addr: starting address of the range
	62	* @size: size of the range in bytes
	63	*
	64	* This is only useful when the bootmem allocator has already been torn
	65	* down, but we are still initializing the system. Pages are given directly
	66	* to the page allocator, no bootmem metadata is updated because it is gone.
	67	*/
	68	void __init free_bootmem_late(unsigned long addr, unsigned long size)
	69	{
	70	unsigned long cursor, end;
	71
	72	kmemleak_free_part(__va(addr), size);
	73
	74	cursor = PFN_UP(addr);
	75	end = PFN_DOWN(addr + size);
	76
	77	for (; cursor < end; cursor++) {
	78	__free_pages_bootmem(pfn_to_page(cursor), 0);
	79	totalram_pages++;
	80	}
	81	}
	82
	83	static void __init __free_pages_memory(unsigned long start, unsigned long end)
	84	{
6bc2e853	85	unsigned long i, start_aligned, end_aligned;
09325873 YL	86	int order = ilog2(BITS_PER_LONG);
	87
	88	start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
	89	end_aligned = end & ~(BITS_PER_LONG - 1);
	90
	91	if (end_aligned <= start_aligned) {
	92	for (i = start; i < end; i++)
	93	__free_pages_bootmem(pfn_to_page(i), 0);
	94
	95	return;
	96	}
	97
	98	for (i = start; i < start_aligned; i++)
	99	__free_pages_bootmem(pfn_to_page(i), 0);
	100
	101	for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
	102	__free_pages_bootmem(pfn_to_page(i), order);
	103
	104	for (i = end_aligned; i < end; i++)
	105	__free_pages_bootmem(pfn_to_page(i), 0);
	106	}
	107
29f67386 YL	108	static unsigned long __init __free_memory_core(phys_addr_t start,
	109	phys_addr_t end)
	110	{
	111	unsigned long start_pfn = PFN_UP(start);
	112	unsigned long end_pfn = min_t(unsigned long,
	113	PFN_DOWN(end), max_low_pfn);
	114
	115	if (start_pfn > end_pfn)
	116	return 0;
	117
	118	__free_pages_memory(start_pfn, end_pfn);
	119
	120	return end_pfn - start_pfn;
	121	}
	122
64a02daa	123	unsigned long __init free_low_memory_core_early(int nodeid)
09325873	124	{
09325873	125	unsigned long count = 0;
29f67386	126	phys_addr_t start, end, size;
8a9ca34c TH	127	u64 i;
8a9ca34c TH	128
29f67386 YL	129	for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL)
	130	count += __free_memory_core(start, end);
	131
	132	/* free range that is used for reserved array if we allocate it */
	133	size = get_allocated_memblock_reserved_regions_info(&start);
	134	if (size)
	135	count += __free_memory_core(start, start + size);
09325873 YL	136
	137	return count;
	138	}
	139
	140	/**
	141	* free_all_bootmem_node - release a node's free pages to the buddy allocator
	142	* @pgdat: node to be released
	143	*
	144	* Returns the number of pages actually released.
	145	*/
	146	unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
	147	{
	148	register_page_bootmem_info_node(pgdat);
	149
64a02daa	150	/* free_low_memory_core_early(MAX_NUMNODES) will be called later */
09325873 YL	151	return 0;
	152	}
	153
	154	/**
	155	* free_all_bootmem - release free pages to the buddy allocator
	156	*
	157	* Returns the number of pages actually released.
	158	*/
	159	unsigned long __init free_all_bootmem(void)
	160	{
	161	/*
	162	* We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
25985edc	163	* because in some case like Node0 doesn't have RAM installed
09325873	164	* low ram will be on Node1
09325873	165	*/
64a02daa	166	return free_low_memory_core_early(MAX_NUMNODES);
09325873 YL	167	}
	168
	169	/**
	170	* free_bootmem_node - mark a page range as usable
	171	* @pgdat: node the range resides on
	172	* @physaddr: starting address of the range
	173	* @size: size of the range in bytes
	174	*
	175	* Partial pages will be considered reserved and left as they are.
	176	*
	177	* The range must reside completely on the specified node.
	178	*/
	179	void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
	180	unsigned long size)
	181	{
	182	kmemleak_free_part(__va(physaddr), size);
24aa0788	183	memblock_free(physaddr, size);
09325873 YL	184	}
	185
	186	/**
	187	* free_bootmem - mark a page range as usable
	188	* @addr: starting address of the range
	189	* @size: size of the range in bytes
	190	*
	191	* Partial pages will be considered reserved and left as they are.
	192	*
	193	* The range must be contiguous but may span node boundaries.
	194	*/
	195	void __init free_bootmem(unsigned long addr, unsigned long size)
	196	{
	197	kmemleak_free_part(__va(addr), size);
24aa0788	198	memblock_free(addr, size);
09325873 YL	199	}
	200
	201	static void * __init ___alloc_bootmem_nopanic(unsigned long size,
	202	unsigned long align,
	203	unsigned long goal,
	204	unsigned long limit)
	205	{
	206	void *ptr;
	207
	208	if (WARN_ON_ONCE(slab_is_available()))
	209	return kzalloc(size, GFP_NOWAIT);
	210
	211	restart:
	212
	213	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
	214
	215	if (ptr)
	216	return ptr;
	217
	218	if (goal != 0) {
	219	goal = 0;
	220	goto restart;
	221	}
	222
	223	return NULL;
	224	}
	225
	226	/**
	227	* __alloc_bootmem_nopanic - allocate boot memory without panicking
	228	* @size: size of the request in bytes
	229	* @align: alignment of the region
	230	* @goal: preferred starting address of the region
	231	*
	232	* The goal is dropped if it can not be satisfied and the allocation will
	233	* fall back to memory below @goal.
	234	*
	235	* Allocation may happen on any node in the system.
	236	*
	237	* Returns NULL on failure.
	238	*/
	239	void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
	240	unsigned long goal)
	241	{
	242	unsigned long limit = -1UL;
	243
	244	return ___alloc_bootmem_nopanic(size, align, goal, limit);
	245	}
	246
	247	static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
	248	unsigned long goal, unsigned long limit)
	249	{
	250	void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
	251
	252	if (mem)
	253	return mem;
	254	/*
	255	* Whoops, we cannot satisfy the allocation request.
	256	*/
	257	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	258	panic("Out of memory");
	259	return NULL;
	260	}
	261
	262	/**
263	* __alloc_bootmem - allocate boot memory
264	* @size: size of the request in bytes
265	* @align: alignment of the region
266	* @goal: preferred starting address of the region
267	*
268	* The goal is dropped if it can not be satisfied and the allocation will
269	* fall back to memory below @goal.
270	*
271	* Allocation may happen on any node in the system.
272	*
273	* The function panics if the request can not be satisfied.
274	*/
275	void * __init __alloc_bootmem(unsigned long size, unsigned long align,
276	unsigned long goal)
277	{
278	unsigned long limit = -1UL;
279
280	return ___alloc_bootmem(size, align, goal, limit);
281	}
282
99ab7b19	283	void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
ba539868 JW	284	unsigned long size,
	285	unsigned long align,
	286	unsigned long goal,
	287	unsigned long limit)
	288	{
	289	void *ptr;
	290
	291	again:
	292	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
	293	goal, limit);
	294	if (ptr)
	295	return ptr;
	296
	297	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
	298	goal, limit);
	299	if (ptr)
	300	return ptr;
	301
	302	if (goal) {
	303	goal = 0;
	304	goto again;
	305	}
	306
	307	return NULL;
	308	}
	309
	310	void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
	311	unsigned long align, unsigned long goal)
	312	{
	313	if (WARN_ON_ONCE(slab_is_available()))
	314	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	315
	316	return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
	317	}
	318
	319	void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
	320	unsigned long align, unsigned long goal,
	321	unsigned long limit)
	322	{
	323	void *ptr;
	324
	325	ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
	326	if (ptr)
	327	return ptr;
	328
	329	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	330	panic("Out of memory");
	331	return NULL;
	332	}
	333
09325873 YL	334	/**
	335	* __alloc_bootmem_node - allocate boot memory from a specific node
	336	* @pgdat: node to allocate from
	337	* @size: size of the request in bytes
	338	* @align: alignment of the region
	339	* @goal: preferred starting address of the region
	340	*
	341	* The goal is dropped if it can not be satisfied and the allocation will
	342	* fall back to memory below @goal.
	343	*
	344	* Allocation may fall back to any node in the system if the specified node
	345	* can not hold the requested memory.
	346	*
	347	* The function panics if the request can not be satisfied.
	348	*/
	349	void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
	350	unsigned long align, unsigned long goal)
	351	{
09325873 YL	352	if (WARN_ON_ONCE(slab_is_available()))
	353	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	354
ba539868	355	return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
09325873 YL	356	}
	357
	358	void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
	359	unsigned long align, unsigned long goal)
	360	{
09325873	361	return __alloc_bootmem_node(pgdat, size, align, goal);
09325873 YL	362	}
09325873 YL	363
09325873 YL	364	#ifndef ARCH_LOW_ADDRESS_LIMIT
	365	#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
	366	#endif
	367
	368	/**
	369	* __alloc_bootmem_low - allocate low boot memory
	370	* @size: size of the request in bytes
	371	* @align: alignment of the region
	372	* @goal: preferred starting address of the region
	373	*
	374	* The goal is dropped if it can not be satisfied and the allocation will
	375	* fall back to memory below @goal.
	376	*
	377	* Allocation may happen on any node in the system.
	378	*
	379	* The function panics if the request can not be satisfied.
	380	*/
	381	void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
	382	unsigned long goal)
	383	{
	384	return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
	385	}
	386
	387	/**
	388	* __alloc_bootmem_low_node - allocate low boot memory from a specific node
	389	* @pgdat: node to allocate from
	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 fall back to any node in the system if the specified node
	398	* can not hold the requested memory.
	399	*
	400	* The function panics if the request can not be satisfied.
	401	*/
	402	void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
	403	unsigned long align, unsigned long goal)
	404	{
09325873 YL	405	if (WARN_ON_ONCE(slab_is_available()))
	406	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	407
ba539868 JW	408	return ___alloc_bootmem_node(pgdat, size, align, goal,
ba539868 JW	409	ARCH_LOW_ADDRESS_LIMIT);
09325873	410	}