blob: 23c3317c09ed03340f68c5ed6dd4625442bc5b5c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/mm/bootmem.c
3 *
4 * Copyright (C) 1999 Ingo Molnar
5 * Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999
6 *
7 * simple boot-time physical memory area allocator and
8 * free memory collector. It's used to deal with reserved
9 * system memory and memory holes as well.
10 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/init.h>
Franck Bui-Huubbc7b922006-09-25 23:31:07 -070012#include <linux/pfn.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/bootmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/module.h>
Franck Bui-Huue786e862006-09-25 23:31:06 -070015
16#include <asm/bug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <asm/io.h>
Franck Bui-Huue786e862006-09-25 23:31:06 -070018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include "internal.h"
20
21/*
22 * Access to this subsystem has to be serialized externally. (this is
23 * true for the boot process anyway)
24 */
25unsigned long max_low_pfn;
26unsigned long min_low_pfn;
27unsigned long max_pfn;
28
Adrian Bunk6d46cc62006-07-10 04:44:21 -070029EXPORT_UNUSED_SYMBOL(max_pfn); /* June 2006 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -080031static LIST_HEAD(bdata_list);
Vivek Goyal92aa63a2005-06-25 14:58:18 -070032#ifdef CONFIG_CRASH_DUMP
33/*
34 * If we have booted due to a crash, max_pfn will be a very low value. We need
35 * to know the amount of memory that the previous kernel used.
36 */
37unsigned long saved_max_pfn;
38#endif
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040/* return the number of _pages_ that will be allocated for the boot bitmap */
41unsigned long __init bootmem_bootmap_pages (unsigned long pages)
42{
43 unsigned long mapsize;
44
45 mapsize = (pages+7)/8;
46 mapsize = (mapsize + ~PAGE_MASK) & PAGE_MASK;
47 mapsize >>= PAGE_SHIFT;
48
49 return mapsize;
50}
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -080051/*
52 * link bdata in order
53 */
Franck Bui-Huu69d49e62006-09-25 23:31:04 -070054static void __init link_bootmem(bootmem_data_t *bdata)
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -080055{
56 bootmem_data_t *ent;
57 if (list_empty(&bdata_list)) {
58 list_add(&bdata->list, &bdata_list);
59 return;
60 }
61 /* insert in order */
62 list_for_each_entry(ent, &bdata_list, list) {
63 if (bdata->node_boot_start < ent->node_boot_start) {
64 list_add_tail(&bdata->list, &ent->list);
65 return;
66 }
67 }
68 list_add_tail(&bdata->list, &bdata_list);
69 return;
70}
71
Franck Bui-Huubbc7b922006-09-25 23:31:07 -070072/*
73 * Given an initialised bdata, it returns the size of the boot bitmap
74 */
75static unsigned long __init get_mapsize(bootmem_data_t *bdata)
76{
77 unsigned long mapsize;
78 unsigned long start = PFN_DOWN(bdata->node_boot_start);
79 unsigned long end = bdata->node_low_pfn;
80
81 mapsize = ((end - start) + 7) / 8;
82 return ALIGN(mapsize, sizeof(long));
83}
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85/*
86 * Called once to set up the allocator itself.
87 */
88static unsigned long __init init_bootmem_core (pg_data_t *pgdat,
89 unsigned long mapstart, unsigned long start, unsigned long end)
90{
91 bootmem_data_t *bdata = pgdat->bdata;
Franck Bui-Huubbc7b922006-09-25 23:31:07 -070092 unsigned long mapsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Franck Bui-Huubbc7b922006-09-25 23:31:07 -070094 bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
95 bdata->node_boot_start = PFN_PHYS(start);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 bdata->node_low_pfn = end;
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -080097 link_bootmem(bdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 /*
100 * Initially all pages are reserved - setup_arch() has to
101 * register free RAM areas explicitly.
102 */
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700103 mapsize = get_mapsize(bdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 memset(bdata->node_bootmem_map, 0xff, mapsize);
105
106 return mapsize;
107}
108
109/*
110 * Marks a particular physical memory range as unallocatable. Usable RAM
111 * might be used for boot-time allocations - or it might get added
112 * to the free page pool later on.
113 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700114static void __init reserve_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
115 unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700117 unsigned long sidx, eidx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 unsigned long i;
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 /*
121 * round up, partially reserved pages are considered
122 * fully reserved.
123 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 BUG_ON(!size);
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700125 BUG_ON(PFN_DOWN(addr) >= bdata->node_low_pfn);
126 BUG_ON(PFN_UP(addr + size) > bdata->node_low_pfn);
127
128 sidx = PFN_DOWN(addr - bdata->node_boot_start);
129 eidx = PFN_UP(addr + size - bdata->node_boot_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131 for (i = sidx; i < eidx; i++)
132 if (test_and_set_bit(i, bdata->node_bootmem_map)) {
133#ifdef CONFIG_DEBUG_BOOTMEM
134 printk("hm, page %08lx reserved twice.\n", i*PAGE_SIZE);
135#endif
136 }
137}
138
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700139static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
140 unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700142 unsigned long sidx, eidx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 unsigned long i;
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 /*
146 * round down end of usable mem, partially free pages are
147 * considered reserved.
148 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 BUG_ON(!size);
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700150 BUG_ON(PFN_DOWN(addr + size) > bdata->node_low_pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 if (addr < bdata->last_success)
153 bdata->last_success = addr;
154
155 /*
156 * Round up the beginning of the address.
157 */
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700158 sidx = PFN_UP(addr) - PFN_DOWN(bdata->node_boot_start);
159 eidx = PFN_DOWN(addr + size - bdata->node_boot_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161 for (i = sidx; i < eidx; i++) {
162 if (unlikely(!test_and_clear_bit(i, bdata->node_bootmem_map)))
163 BUG();
164 }
165}
166
167/*
168 * We 'merge' subsequent allocations to save space. We might 'lose'
169 * some fraction of a page if allocations cannot be satisfied due to
170 * size constraints on boxes where there is physical RAM space
171 * fragmentation - in these cases (mostly large memory boxes) this
172 * is not a problem.
173 *
174 * On low memory boxes we get it right in 100% of the cases.
175 *
176 * alignment has to be a power of 2 value.
177 *
178 * NOTE: This function is _not_ reentrant.
179 */
Andi Kleen267b4802006-03-25 16:31:10 +0100180void * __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181__alloc_bootmem_core(struct bootmem_data *bdata, unsigned long size,
Yasunori Goto281dd252005-10-19 15:52:18 -0700182 unsigned long align, unsigned long goal, unsigned long limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
184 unsigned long offset, remaining_size, areasize, preferred;
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700185 unsigned long i, start = 0, incr, eidx, end_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 void *ret;
187
188 if(!size) {
189 printk("__alloc_bootmem_core(): zero-sized request\n");
190 BUG();
191 }
192 BUG_ON(align & (align-1));
193
Yasunori Goto281dd252005-10-19 15:52:18 -0700194 if (limit && bdata->node_boot_start >= limit)
195 return NULL;
196
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700197 end_pfn = bdata->node_low_pfn;
198 limit = PFN_DOWN(limit);
Yasunori Goto281dd252005-10-19 15:52:18 -0700199 if (limit && end_pfn > limit)
200 end_pfn = limit;
201
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700202 eidx = end_pfn - PFN_DOWN(bdata->node_boot_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 offset = 0;
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700204 if (align && (bdata->node_boot_start & (align - 1UL)) != 0)
205 offset = align - (bdata->node_boot_start & (align - 1UL));
206 offset = PFN_DOWN(offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 /*
209 * We try to allocate bootmem pages above 'goal'
210 * first, then we try to allocate lower pages.
211 */
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700212 if (goal && goal >= bdata->node_boot_start && PFN_DOWN(goal) < end_pfn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 preferred = goal - bdata->node_boot_start;
214
215 if (bdata->last_success >= preferred)
Yasunori Goto281dd252005-10-19 15:52:18 -0700216 if (!limit || (limit && limit > bdata->last_success))
217 preferred = bdata->last_success;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 } else
219 preferred = 0;
220
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700221 preferred = PFN_DOWN(ALIGN(preferred, align)) + offset;
222 areasize = (size + PAGE_SIZE-1) / PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 incr = align >> PAGE_SHIFT ? : 1;
224
225restart_scan:
226 for (i = preferred; i < eidx; i += incr) {
227 unsigned long j;
228 i = find_next_zero_bit(bdata->node_bootmem_map, eidx, i);
229 i = ALIGN(i, incr);
Haren Myneni66d43e92005-12-12 00:37:39 -0800230 if (i >= eidx)
231 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 if (test_bit(i, bdata->node_bootmem_map))
233 continue;
234 for (j = i + 1; j < i + areasize; ++j) {
235 if (j >= eidx)
236 goto fail_block;
237 if (test_bit (j, bdata->node_bootmem_map))
238 goto fail_block;
239 }
240 start = i;
241 goto found;
242 fail_block:
243 i = ALIGN(j, incr);
244 }
245
246 if (preferred > offset) {
247 preferred = offset;
248 goto restart_scan;
249 }
250 return NULL;
251
252found:
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700253 bdata->last_success = PFN_PHYS(start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 BUG_ON(start >= eidx);
255
256 /*
257 * Is the next page of the previous allocation-end the start
258 * of this allocation's buffer? If yes then we can 'merge'
259 * the previous partial page with this allocation.
260 */
261 if (align < PAGE_SIZE &&
262 bdata->last_offset && bdata->last_pos+1 == start) {
Nick Wilson8c0e33c2005-06-25 14:59:00 -0700263 offset = ALIGN(bdata->last_offset, align);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 BUG_ON(offset > PAGE_SIZE);
265 remaining_size = PAGE_SIZE-offset;
266 if (size < remaining_size) {
267 areasize = 0;
268 /* last_pos unchanged */
269 bdata->last_offset = offset+size;
270 ret = phys_to_virt(bdata->last_pos*PAGE_SIZE + offset +
271 bdata->node_boot_start);
272 } else {
273 remaining_size = size - remaining_size;
274 areasize = (remaining_size+PAGE_SIZE-1)/PAGE_SIZE;
275 ret = phys_to_virt(bdata->last_pos*PAGE_SIZE + offset +
276 bdata->node_boot_start);
277 bdata->last_pos = start+areasize-1;
278 bdata->last_offset = remaining_size;
279 }
280 bdata->last_offset &= ~PAGE_MASK;
281 } else {
282 bdata->last_pos = start + areasize - 1;
283 bdata->last_offset = size & ~PAGE_MASK;
284 ret = phys_to_virt(start * PAGE_SIZE + bdata->node_boot_start);
285 }
286
287 /*
288 * Reserve the area now:
289 */
290 for (i = start; i < start+areasize; i++)
291 if (unlikely(test_and_set_bit(i, bdata->node_bootmem_map)))
292 BUG();
293 memset(ret, 0, size);
294 return ret;
295}
296
297static unsigned long __init free_all_bootmem_core(pg_data_t *pgdat)
298{
299 struct page *page;
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700300 unsigned long pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 bootmem_data_t *bdata = pgdat->bdata;
302 unsigned long i, count, total = 0;
303 unsigned long idx;
304 unsigned long *map;
305 int gofast = 0;
306
307 BUG_ON(!bdata->node_bootmem_map);
308
309 count = 0;
310 /* first extant page of the node */
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700311 pfn = PFN_DOWN(bdata->node_boot_start);
312 idx = bdata->node_low_pfn - pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 map = bdata->node_bootmem_map;
314 /* Check physaddr is O(LOG2(BITS_PER_LONG)) page aligned */
315 if (bdata->node_boot_start == 0 ||
316 ffs(bdata->node_boot_start) - PAGE_SHIFT > ffs(BITS_PER_LONG))
317 gofast = 1;
318 for (i = 0; i < idx; ) {
319 unsigned long v = ~map[i / BITS_PER_LONG];
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700320
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 if (gofast && v == ~0UL) {
David Howellsa226f6c2006-01-06 00:11:08 -0800322 int order;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700324 page = pfn_to_page(pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 count += BITS_PER_LONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 order = ffs(BITS_PER_LONG) - 1;
David Howellsa226f6c2006-01-06 00:11:08 -0800327 __free_pages_bootmem(page, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 i += BITS_PER_LONG;
329 page += BITS_PER_LONG;
330 } else if (v) {
331 unsigned long m;
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700332
333 page = pfn_to_page(pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 for (m = 1; m && i < idx; m<<=1, page++, i++) {
335 if (v & m) {
336 count++;
David Howellsa226f6c2006-01-06 00:11:08 -0800337 __free_pages_bootmem(page, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 }
339 }
340 } else {
341 i+=BITS_PER_LONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 }
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700343 pfn += BITS_PER_LONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 }
345 total += count;
346
347 /*
348 * Now free the allocator bitmap itself, it's not
349 * needed anymore:
350 */
351 page = virt_to_page(bdata->node_bootmem_map);
352 count = 0;
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700353 idx = (get_mapsize(bdata) + PAGE_SIZE-1) >> PAGE_SHIFT;
354 for (i = 0; i < idx; i++, page++) {
David Howellsa226f6c2006-01-06 00:11:08 -0800355 __free_pages_bootmem(page, 0);
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700356 count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
358 total += count;
359 bdata->node_bootmem_map = NULL;
360
361 return total;
362}
363
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700364unsigned long __init init_bootmem_node (pg_data_t *pgdat, unsigned long freepfn,
365 unsigned long startpfn, unsigned long endpfn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
367 return(init_bootmem_core(pgdat, freepfn, startpfn, endpfn));
368}
369
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700370void __init reserve_bootmem_node (pg_data_t *pgdat, unsigned long physaddr,
371 unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372{
373 reserve_bootmem_core(pgdat->bdata, physaddr, size);
374}
375
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700376void __init free_bootmem_node (pg_data_t *pgdat, unsigned long physaddr,
377 unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378{
379 free_bootmem_core(pgdat->bdata, physaddr, size);
380}
381
382unsigned long __init free_all_bootmem_node (pg_data_t *pgdat)
383{
384 return(free_all_bootmem_core(pgdat));
385}
386
387unsigned long __init init_bootmem (unsigned long start, unsigned long pages)
388{
389 max_low_pfn = pages;
390 min_low_pfn = start;
391 return(init_bootmem_core(NODE_DATA(0), start, 0, pages));
392}
393
394#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
395void __init reserve_bootmem (unsigned long addr, unsigned long size)
396{
397 reserve_bootmem_core(NODE_DATA(0)->bdata, addr, size);
398}
399#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
400
401void __init free_bootmem (unsigned long addr, unsigned long size)
402{
403 free_bootmem_core(NODE_DATA(0)->bdata, addr, size);
404}
405
406unsigned long __init free_all_bootmem (void)
407{
408 return(free_all_bootmem_core(NODE_DATA(0)));
409}
410
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700411void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
412 unsigned long goal)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413{
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -0800414 bootmem_data_t *bdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 void *ptr;
416
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -0800417 list_for_each_entry(bdata, &bdata_list, list)
418 if ((ptr = __alloc_bootmem_core(bdata, size, align, goal, 0)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 return(ptr);
Andi Kleena8062232006-04-07 19:49:21 +0200420 return NULL;
421}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700423void * __init __alloc_bootmem(unsigned long size, unsigned long align,
424 unsigned long goal)
Andi Kleena8062232006-04-07 19:49:21 +0200425{
426 void *mem = __alloc_bootmem_nopanic(size,align,goal);
427 if (mem)
428 return mem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 /*
430 * Whoops, we cannot satisfy the allocation request.
431 */
432 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
433 panic("Out of memory");
434 return NULL;
435}
436
Yasunori Goto281dd252005-10-19 15:52:18 -0700437
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700438void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
439 unsigned long align, unsigned long goal)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440{
441 void *ptr;
442
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800443 ptr = __alloc_bootmem_core(pgdat->bdata, size, align, goal, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 if (ptr)
445 return (ptr);
446
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800447 return __alloc_bootmem(size, align, goal);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800450#define LOW32LIMIT 0xffffffff
451
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700452void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
453 unsigned long goal)
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800454{
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -0800455 bootmem_data_t *bdata;
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800456 void *ptr;
457
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -0800458 list_for_each_entry(bdata, &bdata_list, list)
459 if ((ptr = __alloc_bootmem_core(bdata, size,
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800460 align, goal, LOW32LIMIT)))
461 return(ptr);
462
463 /*
464 * Whoops, we cannot satisfy the allocation request.
465 */
466 printk(KERN_ALERT "low bootmem alloc of %lu bytes failed!\n", size);
467 panic("Out of low memory");
468 return NULL;
469}
470
471void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
472 unsigned long align, unsigned long goal)
473{
474 return __alloc_bootmem_core(pgdat->bdata, size, align, goal, LOW32LIMIT);
475}