[mirror_ubuntu-bionic-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(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);
}

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);

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

	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
					goal, -1ULL);
	if (ptr)
		return ptr;

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

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

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;

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

	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	panic("Out of memory");
	return NULL;
}
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
64a02daa	108	unsigned long __init free_low_memory_core_early(int nodeid)
09325873	109	{
09325873	110	unsigned long count = 0;
8a9ca34c TH	111	phys_addr_t start, end;
	112	u64 i;
	113
	114	/* free reserved array temporarily so that it's treated as free area */
	115	memblock_free_reserved_regions();
	116
	117	for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) {
	118	unsigned long start_pfn = PFN_UP(start);
	119	unsigned long end_pfn = min_t(unsigned long,
	120	PFN_DOWN(end), max_low_pfn);
	121	if (start_pfn < end_pfn) {
	122	__free_pages_memory(start_pfn, end_pfn);
	123	count += end_pfn - start_pfn;
	124	}
09325873 YL	125	}
09325873 YL	126
8a9ca34c TH	127	/* put region array back? */
8a9ca34c TH	128	memblock_reserve_reserved_regions();
09325873 YL	129	return count;
	130	}
	131
	132	/**
	133	* free_all_bootmem_node - release a node's free pages to the buddy allocator
	134	* @pgdat: node to be released
	135	*
	136	* Returns the number of pages actually released.
	137	*/
	138	unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
	139	{
	140	register_page_bootmem_info_node(pgdat);
	141
64a02daa	142	/* free_low_memory_core_early(MAX_NUMNODES) will be called later */
09325873 YL	143	return 0;
	144	}
	145
	146	/**
	147	* free_all_bootmem - release free pages to the buddy allocator
	148	*
	149	* Returns the number of pages actually released.
	150	*/
	151	unsigned long __init free_all_bootmem(void)
	152	{
	153	/*
	154	* We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
25985edc	155	* because in some case like Node0 doesn't have RAM installed
09325873 YL	156	* low ram will be on Node1
	157	* Use MAX_NUMNODES will make sure all ranges in early_node_map[]
	158	* will be used instead of only Node0 related
	159	*/
64a02daa	160	return free_low_memory_core_early(MAX_NUMNODES);
09325873 YL	161	}
	162
	163	/**
	164	* free_bootmem_node - mark a page range as usable
	165	* @pgdat: node the range resides on
	166	* @physaddr: starting address of the range
	167	* @size: size of the range in bytes
	168	*
	169	* Partial pages will be considered reserved and left as they are.
	170	*
	171	* The range must reside completely on the specified node.
	172	*/
	173	void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
	174	unsigned long size)
	175	{
	176	kmemleak_free_part(__va(physaddr), size);
24aa0788	177	memblock_free(physaddr, size);
09325873 YL	178	}
	179
	180	/**
	181	* free_bootmem - mark a page range as usable
	182	* @addr: starting address of the range
	183	* @size: size of the range in bytes
	184	*
	185	* Partial pages will be considered reserved and left as they are.
	186	*
	187	* The range must be contiguous but may span node boundaries.
	188	*/
	189	void __init free_bootmem(unsigned long addr, unsigned long size)
	190	{
	191	kmemleak_free_part(__va(addr), size);
24aa0788	192	memblock_free(addr, size);
09325873 YL	193	}
	194
	195	static void * __init ___alloc_bootmem_nopanic(unsigned long size,
	196	unsigned long align,
	197	unsigned long goal,
	198	unsigned long limit)
	199	{
	200	void *ptr;
	201
	202	if (WARN_ON_ONCE(slab_is_available()))
	203	return kzalloc(size, GFP_NOWAIT);
	204
	205	restart:
	206
	207	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
	208
	209	if (ptr)
	210	return ptr;
	211
	212	if (goal != 0) {
	213	goal = 0;
	214	goto restart;
	215	}
	216
	217	return NULL;
	218	}
	219
	220	/**
	221	* __alloc_bootmem_nopanic - allocate boot memory without panicking
	222	* @size: size of the request in bytes
	223	* @align: alignment of the region
	224	* @goal: preferred starting address of the region
	225	*
	226	* The goal is dropped if it can not be satisfied and the allocation will
	227	* fall back to memory below @goal.
	228	*
	229	* Allocation may happen on any node in the system.
	230	*
	231	* Returns NULL on failure.
	232	*/
	233	void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
	234	unsigned long goal)
	235	{
	236	unsigned long limit = -1UL;
	237
	238	return ___alloc_bootmem_nopanic(size, align, goal, limit);
	239	}
	240
	241	static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
	242	unsigned long goal, unsigned long limit)
	243	{
	244	void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
	245
	246	if (mem)
	247	return mem;
	248	/*
	249	* Whoops, we cannot satisfy the allocation request.
	250	*/
	251	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	252	panic("Out of memory");
	253	return NULL;
	254	}
	255
	256	/**
257	* __alloc_bootmem - allocate boot memory
258	* @size: size of the request in bytes
259	* @align: alignment of the region
260	* @goal: preferred starting address of the region
261	*
262	* The goal is dropped if it can not be satisfied and the allocation will
263	* fall back to memory below @goal.
264	*
265	* Allocation may happen on any node in the system.
266	*
267	* The function panics if the request can not be satisfied.
268	*/
269	void * __init __alloc_bootmem(unsigned long size, unsigned long align,
270	unsigned long goal)
271	{
272	unsigned long limit = -1UL;
273
274	return ___alloc_bootmem(size, align, goal, limit);
275	}
276
277	/**
278	* __alloc_bootmem_node - allocate boot memory from a specific node
279	* @pgdat: node to allocate from
280	* @size: size of the request in bytes
281	* @align: alignment of the region
282	* @goal: preferred starting address of the region
283	*
284	* The goal is dropped if it can not be satisfied and the allocation will
285	* fall back to memory below @goal.
286	*
287	* Allocation may fall back to any node in the system if the specified node
288	* can not hold the requested memory.
289	*
290	* The function panics if the request can not be satisfied.
291	*/
292	void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
293	unsigned long align, unsigned long goal)
294	{
295	void *ptr;
296
297	if (WARN_ON_ONCE(slab_is_available()))
298	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
299
4e1c2b28	300	again:
09325873 YL	301	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
	302	goal, -1ULL);
	303	if (ptr)
	304	return ptr;
	305
4e1c2b28 DM	306	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
4e1c2b28 DM	307	goal, -1ULL);
2c478eae JW	308	if (ptr)
	309	return ptr;
	310
	311	if (goal) {
4e1c2b28 DM	312	goal = 0;
	313	goto again;
	314	}
2c478eae JW	315
	316	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	317	panic("Out of memory");
	318	return NULL;
09325873 YL	319	}
	320
	321	void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
	322	unsigned long align, unsigned long goal)
	323	{
09325873	324	return __alloc_bootmem_node(pgdat, size, align, goal);
09325873 YL	325	}
	326
	327	#ifdef CONFIG_SPARSEMEM
	328	/**
	329	* alloc_bootmem_section - allocate boot memory from a specific section
	330	* @size: size of the request in bytes
	331	* @section_nr: sparse map section to allocate from
	332	*
	333	* Return NULL on failure.
	334	*/
	335	void * __init alloc_bootmem_section(unsigned long size,
	336	unsigned long section_nr)
	337	{
	338	unsigned long pfn, goal, limit;
	339
	340	pfn = section_nr_to_pfn(section_nr);
	341	goal = pfn << PAGE_SHIFT;
	342	limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
	343
	344	return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
	345	SMP_CACHE_BYTES, goal, limit);
	346	}
	347	#endif
	348
	349	void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
	350	unsigned long align, unsigned long goal)
	351	{
	352	void *ptr;
	353
	354	if (WARN_ON_ONCE(slab_is_available()))
	355	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
	356
	357	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
	358	goal, -1ULL);
	359	if (ptr)
	360	return ptr;
	361
	362	return __alloc_bootmem_nopanic(size, align, goal);
	363	}
	364
	365	#ifndef ARCH_LOW_ADDRESS_LIMIT
	366	#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
	367	#endif
	368
	369	/**
	370	* __alloc_bootmem_low - allocate low boot memory
	371	* @size: size of the request in bytes
	372	* @align: alignment of the region
	373	* @goal: preferred starting address of the region
	374	*
	375	* The goal is dropped if it can not be satisfied and the allocation will
	376	* fall back to memory below @goal.
	377	*
	378	* Allocation may happen on any node in the system.
	379	*
	380	* The function panics if the request can not be satisfied.
	381	*/
	382	void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
	383	unsigned long goal)
	384	{
	385	return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
	386	}
	387
	388	/**
389	* __alloc_bootmem_low_node - allocate low boot memory from a specific node
390	* @pgdat: node to allocate from
391	* @size: size of the request in bytes
392	* @align: alignment of the region
393	* @goal: preferred starting address of the region
394	*
395	* The goal is dropped if it can not be satisfied and the allocation will
396	* fall back to memory below @goal.
397	*
398	* Allocation may fall back to any node in the system if the specified node
399	* can not hold the requested memory.
400	*
401	* The function panics if the request can not be satisfied.
402	*/
403	void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
404	unsigned long align, unsigned long goal)
405	{
406	void *ptr;
407
408	if (WARN_ON_ONCE(slab_is_available()))
409	return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
410
411	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
412	goal, ARCH_LOW_ADDRESS_LIMIT);
413	if (ptr)
414	return ptr;
415
2c478eae JW	416	ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
	417	goal, ARCH_LOW_ADDRESS_LIMIT);
	418	if (ptr)
	419	return ptr;
	420
	421	printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
	422	panic("Out of memory");
	423	return NULL;
09325873	424	}