[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)
{
	int i;
	unsigned long 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);
}

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

	/* free reserved array temporarily so that it's treated as free area */
	memblock_free_reserved_regions();

	for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) {
		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) {
			__free_pages_memory(start_pfn, end_pfn);
			count += end_pfn - start_pfn;
		}
	}

	/* put region array back? */
	memblock_reserve_reserved_regions();
	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
	 * Use MAX_NUMNODES will make sure all ranges in early_node_map[]
	 *  will be used instead of only Node0 related
	 */
	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);
}

/**
 * __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)
{
	void *ptr;

	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
					 goal, -1ULL);
	if (ptr)
		return ptr;

	return __alloc_memory_core_early(MAX_NUMNODES, size, align,
					 goal, -1ULL);
}

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);
}

#ifdef CONFIG_SPARSEMEM
/**
 * alloc_bootmem_section - allocate boot memory from a specific section
 * @size: size of the request in bytes
 * @section_nr: sparse map section to allocate from
 *
 * Return NULL on failure.
 */
void * __init alloc_bootmem_section(unsigned long size,
				    unsigned long section_nr)
{
	unsigned long pfn, goal, limit;

	pfn = section_nr_to_pfn(section_nr);
	goal = pfn << PAGE_SHIFT;
	limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;

	return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
					 SMP_CACHE_BYTES, goal, limit);
}
#endif

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

	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

	ptr =  __alloc_memory_core_early(pgdat->node_id, size, align,
						 goal, -1ULL);
	if (ptr)
		return ptr;

	return __alloc_bootmem_nopanic(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)
{
	void *ptr;

	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

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

	return  __alloc_memory_core_early(MAX_NUMNODES, 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	{
	85	int i;
	86	unsigned long start_aligned, end_aligned;
	87	int order = ilog2(BITS_PER_LONG);
	88
	89	start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
	90	end_aligned = end & ~(BITS_PER_LONG - 1);
	91
	92	if (end_aligned <= start_aligned) {
	93	for (i = start; i < end; i++)
	94	__free_pages_bootmem(pfn_to_page(i), 0);
	95
	96	return;
	97	}
	98
	99	for (i = start; i < start_aligned; i++)
	100	__free_pages_bootmem(pfn_to_page(i), 0);
	101
	102	for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
	103	__free_pages_bootmem(pfn_to_page(i), order);
	104
	105	for (i = end_aligned; i < end; i++)
	106	__free_pages_bootmem(pfn_to_page(i), 0);
	107	}
	108
64a02daa	109	unsigned long __init free_low_memory_core_early(int nodeid)
09325873	110	{
09325873	111	unsigned long count = 0;
8a9ca34c TH	112	phys_addr_t start, end;
	113	u64 i;
	114
	115	/* free reserved array temporarily so that it's treated as free area */
	116	memblock_free_reserved_regions();
	117
	118	for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) {
	119	unsigned long start_pfn = PFN_UP(start);
	120	unsigned long end_pfn = min_t(unsigned long,
	121	PFN_DOWN(end), max_low_pfn);
	122	if (start_pfn < end_pfn) {
	123	__free_pages_memory(start_pfn, end_pfn);
	124	count += end_pfn - start_pfn;
	125	}
09325873 YL	126	}
09325873 YL	127
8a9ca34c TH	128	/* put region array back? */
8a9ca34c TH	129	memblock_reserve_reserved_regions();
09325873 YL	130	return count;
	131	}
	132
	133	/**
	134	* free_all_bootmem_node - release a node's free pages to the buddy allocator
	135	* @pgdat: node to be released
	136	*
	137	* Returns the number of pages actually released.
	138	*/
	139	unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
	140	{
	141	register_page_bootmem_info_node(pgdat);
	142
64a02daa	143	/* free_low_memory_core_early(MAX_NUMNODES) will be called later */
09325873 YL	144	return 0;
	145	}
	146
	147	/**
	148	* free_all_bootmem - release free pages to the buddy allocator
	149	*
	150	* Returns the number of pages actually released.
	151	*/
	152	unsigned long __init free_all_bootmem(void)
	153	{
	154	/*
	155	* We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
25985edc	156	* because in some case like Node0 doesn't have RAM installed
09325873 YL	157	* low ram will be on Node1
	158	* Use MAX_NUMNODES will make sure all ranges in early_node_map[]
	159	* will be used instead of only Node0 related
	160	*/
64a02daa	161	return free_low_memory_core_early(MAX_NUMNODES);
09325873 YL	162	}
	163
	164	/**
	165	* free_bootmem_node - mark a page range as usable
	166	* @pgdat: node the range resides on
	167	* @physaddr: starting address of the range
	168	* @size: size of the range in bytes
	169	*
	170	* Partial pages will be considered reserved and left as they are.
	171	*
	172	* The range must reside completely on the specified node.
	173	*/
	174	void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
	175	unsigned long size)
	176	{
	177	kmemleak_free_part(__va(physaddr), size);
24aa0788	178	memblock_free(physaddr, size);
09325873 YL	179	}
	180
	181	/**
	182	* free_bootmem - mark a page range as usable
	183	* @addr: starting address of the range
	184	* @size: size of the range in bytes
	185	*
	186	* Partial pages will be considered reserved and left as they are.
	187	*
	188	* The range must be contiguous but may span node boundaries.
	189	*/
	190	void __init free_bootmem(unsigned long addr, unsigned long size)
	191	{
	192	kmemleak_free_part(__va(addr), size);
24aa0788	193	memblock_free(addr, size);
09325873 YL	194	}
	195
	196	static void * __init ___alloc_bootmem_nopanic(unsigned long size,
	197	unsigned long align,
	198	unsigned long goal,
	199	unsigned long limit)
	200	{
	201	void *ptr;
	202
	203	if (WARN_ON_ONCE(slab_is_available()))
	204	return kzalloc(size, GFP_NOWAIT);
	205
	206	restart:
	207
	208	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
	209
	210	if (ptr)
	211	return ptr;
	212
	213	if (goal != 0) {
	214	goal = 0;
	215	goto restart;
	216	}
	217
	218	return NULL;
	219	}
	220
	221	/**
	222	* __alloc_bootmem_nopanic - allocate boot memory without panicking
	223	* @size: size of the request in bytes
	224	* @align: alignment of the region
	225	* @goal: preferred starting address of the region
	226	*
	227	* The goal is dropped if it can not be satisfied and the allocation will
	228	* fall back to memory below @goal.
	229	*
	230	* Allocation may happen on any node in the system.
	231	*
	232	* Returns NULL on failure.
	233	*/
	234	void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
	235	unsigned long goal)
	236	{
	237	unsigned long limit = -1UL;
	238
	239	return ___alloc_bootmem_nopanic(size, align, goal, limit);
	240	}
	241
	242	static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
	243	unsigned long goal, unsigned long limit)
	244	{
	245	void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
	246
	247	if (mem)
	248	return mem;
	249	/*
	250	* Whoops, we cannot satisfy the allocation request.
	251	*/
	252	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	253	panic("Out of memory");
	254	return NULL;
	255	}
	256
	257	/**
258	* __alloc_bootmem - allocate boot memory
259	* @size: size of the request in bytes
260	* @align: alignment of the region
261	* @goal: preferred starting address of the region
262	*
263	* The goal is dropped if it can not be satisfied and the allocation will
264	* fall back to memory below @goal.
265	*
266	* Allocation may happen on any node in the system.
267	*
268	* The function panics if the request can not be satisfied.
269	*/
270	void * __init __alloc_bootmem(unsigned long size, unsigned long align,
271	unsigned long goal)
272	{
273	unsigned long limit = -1UL;
274
275	return ___alloc_bootmem(size, align, goal, limit);
276	}
277
278	/**
279	* __alloc_bootmem_node - allocate boot memory from a specific node
280	* @pgdat: node to allocate from
281	* @size: size of the request in bytes
282	* @align: alignment of the region
283	* @goal: preferred starting address of the region
284	*
285	* The goal is dropped if it can not be satisfied and the allocation will
286	* fall back to memory below @goal.
287	*
288	* Allocation may fall back to any node in the system if the specified node
289	* can not hold the requested memory.
290	*
291	* The function panics if the request can not be satisfied.
292	*/
293	void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
294	unsigned long align, unsigned long goal)
295	{
296	void *ptr;
297
298	if (WARN_ON_ONCE(slab_is_available()))
299	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
300
301	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
302	goal, -1ULL);
303	if (ptr)
304	return ptr;
305
306	return __alloc_memory_core_early(MAX_NUMNODES, size, align,
307	goal, -1ULL);
308	}
309
310	void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
311	unsigned long align, unsigned long goal)
312	{
09325873	313	return __alloc_bootmem_node(pgdat, size, align, goal);
09325873 YL	314	}
	315
	316	#ifdef CONFIG_SPARSEMEM
	317	/**
	318	* alloc_bootmem_section - allocate boot memory from a specific section
	319	* @size: size of the request in bytes
	320	* @section_nr: sparse map section to allocate from
	321	*
	322	* Return NULL on failure.
	323	*/
	324	void * __init alloc_bootmem_section(unsigned long size,
	325	unsigned long section_nr)
	326	{
	327	unsigned long pfn, goal, limit;
	328
	329	pfn = section_nr_to_pfn(section_nr);
	330	goal = pfn << PAGE_SHIFT;
	331	limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
	332
	333	return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
	334	SMP_CACHE_BYTES, goal, limit);
	335	}
	336	#endif
	337
	338	void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
	339	unsigned long align, unsigned long goal)
	340	{
	341	void *ptr;
	342
	343	if (WARN_ON_ONCE(slab_is_available()))
	344	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	345
	346	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
	347	goal, -1ULL);
	348	if (ptr)
	349	return ptr;
	350
	351	return __alloc_bootmem_nopanic(size, align, goal);
	352	}
	353
	354	#ifndef ARCH_LOW_ADDRESS_LIMIT
	355	#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
	356	#endif
	357
	358	/**
	359	* __alloc_bootmem_low - allocate low boot memory
	360	* @size: size of the request in bytes
	361	* @align: alignment of the region
	362	* @goal: preferred starting address of the region
	363	*
	364	* The goal is dropped if it can not be satisfied and the allocation will
	365	* fall back to memory below @goal.
	366	*
	367	* Allocation may happen on any node in the system.
	368	*
	369	* The function panics if the request can not be satisfied.
	370	*/
	371	void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
	372	unsigned long goal)
	373	{
	374	return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
	375	}
	376
	377	/**
378	* __alloc_bootmem_low_node - allocate low boot memory from a specific node
379	* @pgdat: node to allocate from
380	* @size: size of the request in bytes
381	* @align: alignment of the region
382	* @goal: preferred starting address of the region
383	*
384	* The goal is dropped if it can not be satisfied and the allocation will
385	* fall back to memory below @goal.
386	*
387	* Allocation may fall back to any node in the system if the specified node
388	* can not hold the requested memory.
389	*
390	* The function panics if the request can not be satisfied.
391	*/
392	void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
393	unsigned long align, unsigned long goal)
394	{
395	void *ptr;
396
397	if (WARN_ON_ONCE(slab_is_available()))
398	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
399
400	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
401	goal, ARCH_LOW_ADDRESS_LIMIT);
402	if (ptr)
403	return ptr;
404
405	return __alloc_memory_core_early(MAX_NUMNODES, size, align,
406	goal, ARCH_LOW_ADDRESS_LIMIT);
407	}