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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Johannes Weiner57cfc292008-07-23 21:28:00 -07002 * bootmem - A boot-time physical memory allocator and configurator
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) 1999 Ingo Molnar
Johannes Weiner57cfc292008-07-23 21:28:00 -07005 * 1999 Kanoj Sarcar, SGI
6 * 2008 Johannes Weiner
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
Johannes Weiner57cfc292008-07-23 21:28:00 -07008 * Access to this subsystem has to be serialized externally (which is true
9 * for the boot process anyway).
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/bootmem.h>
Paul Gortmakerb95f1b312011-10-16 02:01:52 -040015#include <linux/export.h>
Catalin Marinasec3a3542009-07-07 10:33:01 +010016#include <linux/kmemleak.h>
Yinghai Lu08677212010-02-10 01:20:20 -080017#include <linux/range.h>
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070018#include <linux/memblock.h>
Franck Bui-Huue786e862006-09-25 23:31:06 -070019
20#include <asm/bug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <asm/io.h>
Heiko Carstensdfd54cb2006-09-25 23:31:33 -070022#include <asm/processor.h>
Franck Bui-Huue786e862006-09-25 23:31:06 -070023
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "internal.h"
25
Yinghai Lue782ab42011-02-24 14:43:06 +010026#ifndef CONFIG_NEED_MULTIPLE_NODES
27struct pglist_data __refdata contig_page_data = {
28 .bdata = &bootmem_node_data[0]
29};
30EXPORT_SYMBOL(contig_page_data);
31#endif
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033unsigned long max_low_pfn;
34unsigned long min_low_pfn;
35unsigned long max_pfn;
36
Johannes Weinerb61bfa32008-07-23 21:26:55 -070037bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
38
Johannes Weiner636cc402008-07-23 21:28:03 -070039static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
40
Johannes Weiner2e5237d2008-07-23 21:28:02 -070041static int bootmem_debug;
42
43static int __init bootmem_debug_setup(char *buf)
44{
45 bootmem_debug = 1;
46 return 0;
47}
48early_param("bootmem_debug", bootmem_debug_setup);
49
50#define bdebug(fmt, args...) ({ \
51 if (unlikely(bootmem_debug)) \
52 printk(KERN_INFO \
53 "bootmem::%s " fmt, \
Harvey Harrison80a914d2008-10-15 22:01:25 -070054 __func__, ## args); \
Johannes Weiner2e5237d2008-07-23 21:28:02 -070055})
56
Johannes Weinerdf049a52008-07-23 21:28:02 -070057static unsigned long __init bootmap_bytes(unsigned long pages)
Johannes Weiner223e8dc2008-07-23 21:28:00 -070058{
Uwe Kleine-König9571a982012-01-10 15:08:00 -080059 unsigned long bytes = DIV_ROUND_UP(pages, 8);
Johannes Weiner223e8dc2008-07-23 21:28:00 -070060
Johannes Weinerdf049a52008-07-23 21:28:02 -070061 return ALIGN(bytes, sizeof(long));
Johannes Weiner223e8dc2008-07-23 21:28:00 -070062}
63
Johannes Weinera66fd7d2008-07-23 21:28:01 -070064/**
65 * bootmem_bootmap_pages - calculate bitmap size in pages
66 * @pages: number of pages the bitmap has to represent
67 */
Franck Bui-Huuf71bf0c2006-09-25 23:31:08 -070068unsigned long __init bootmem_bootmap_pages(unsigned long pages)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069{
Johannes Weinerdf049a52008-07-23 21:28:02 -070070 unsigned long bytes = bootmap_bytes(pages);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Johannes Weinerdf049a52008-07-23 21:28:02 -070072 return PAGE_ALIGN(bytes) >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073}
Franck Bui-Huuf71bf0c2006-09-25 23:31:08 -070074
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -080075/*
76 * link bdata in order
77 */
Franck Bui-Huu69d49e62006-09-25 23:31:04 -070078static void __init link_bootmem(bootmem_data_t *bdata)
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -080079{
Gavin Shan5c2b8a12012-05-29 15:06:46 -070080 bootmem_data_t *ent;
Franck Bui-Huuf71bf0c2006-09-25 23:31:08 -070081
Gavin Shan5c2b8a12012-05-29 15:06:46 -070082 list_for_each_entry(ent, &bdata_list, list) {
83 if (bdata->node_min_pfn < ent->node_min_pfn) {
84 list_add_tail(&bdata->list, &ent->list);
85 return;
86 }
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -080087 }
Gavin Shan5c2b8a12012-05-29 15:06:46 -070088
89 list_add_tail(&bdata->list, &bdata_list);
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -080090}
91
Franck Bui-Huubbc7b922006-09-25 23:31:07 -070092/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 * Called once to set up the allocator itself.
94 */
Johannes Weiner8ae04462008-07-23 21:26:59 -070095static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 unsigned long mapstart, unsigned long start, unsigned long end)
97{
Franck Bui-Huubbc7b922006-09-25 23:31:07 -070098 unsigned long mapsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700100 mminit_validate_memmodel_limits(&start, &end);
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700101 bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
Johannes Weiner3560e242008-07-23 21:28:09 -0700102 bdata->node_min_pfn = start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 bdata->node_low_pfn = end;
KAMEZAWA Hiroyuki679bc9f2006-03-27 01:15:58 -0800104 link_bootmem(bdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106 /*
107 * Initially all pages are reserved - setup_arch() has to
108 * register free RAM areas explicitly.
109 */
Johannes Weinerdf049a52008-07-23 21:28:02 -0700110 mapsize = bootmap_bytes(end - start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 memset(bdata->node_bootmem_map, 0xff, mapsize);
112
Johannes Weiner2e5237d2008-07-23 21:28:02 -0700113 bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
114 bdata - bootmem_node_data, start, mapstart, end, mapsize);
115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return mapsize;
117}
118
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700119/**
120 * init_bootmem_node - register a node as boot memory
121 * @pgdat: node to register
122 * @freepfn: pfn where the bitmap for this node is to be placed
123 * @startpfn: first pfn on the node
124 * @endpfn: first pfn after the node
125 *
126 * Returns the number of bytes needed to hold the bitmap for this node.
127 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700128unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
129 unsigned long startpfn, unsigned long endpfn)
130{
131 return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn);
132}
133
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700134/**
135 * init_bootmem - register boot memory
136 * @start: pfn where the bitmap is to be placed
137 * @pages: number of available physical pages
138 *
139 * Returns the number of bytes needed to hold the bitmap.
140 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700141unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
142{
143 max_low_pfn = pages;
144 min_low_pfn = start;
145 return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages);
146}
Yinghai Lu09325872011-02-24 14:43:05 +0100147
FUJITA Tomonori9f993ac2009-11-10 19:46:17 +0900148/*
149 * free_bootmem_late - free bootmem pages directly to page allocator
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800150 * @addr: starting physical address of the range
FUJITA Tomonori9f993ac2009-11-10 19:46:17 +0900151 * @size: size of the range in bytes
152 *
153 * This is only useful when the bootmem allocator has already been torn
154 * down, but we are still initializing the system. Pages are given directly
155 * to the page allocator, no bootmem metadata is updated because it is gone.
156 */
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800157void __init free_bootmem_late(unsigned long physaddr, unsigned long size)
FUJITA Tomonori9f993ac2009-11-10 19:46:17 +0900158{
159 unsigned long cursor, end;
160
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800161 kmemleak_free_part(__va(physaddr), size);
FUJITA Tomonori9f993ac2009-11-10 19:46:17 +0900162
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800163 cursor = PFN_UP(physaddr);
164 end = PFN_DOWN(physaddr + size);
FUJITA Tomonori9f993ac2009-11-10 19:46:17 +0900165
166 for (; cursor < end; cursor++) {
167 __free_pages_bootmem(pfn_to_page(cursor), 0);
168 totalram_pages++;
169 }
170}
171
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700172static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
173{
174 struct page *page;
Johannes Weiner41546c12008-07-23 21:28:03 -0700175 unsigned long start, end, pages, count = 0;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700176
Johannes Weiner41546c12008-07-23 21:28:03 -0700177 if (!bdata->node_bootmem_map)
178 return 0;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700179
Johannes Weiner3560e242008-07-23 21:28:09 -0700180 start = bdata->node_min_pfn;
Johannes Weiner41546c12008-07-23 21:28:03 -0700181 end = bdata->node_low_pfn;
182
Johannes Weiner799f9332012-01-10 15:08:15 -0800183 bdebug("nid=%td start=%lx end=%lx\n",
184 bdata - bootmem_node_data, start, end);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700185
Johannes Weiner41546c12008-07-23 21:28:03 -0700186 while (start < end) {
187 unsigned long *map, idx, vec;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700188
Johannes Weiner41546c12008-07-23 21:28:03 -0700189 map = bdata->node_bootmem_map;
Johannes Weiner3560e242008-07-23 21:28:09 -0700190 idx = start - bdata->node_min_pfn;
Johannes Weiner41546c12008-07-23 21:28:03 -0700191 vec = ~map[idx / BITS_PER_LONG];
Johannes Weiner799f9332012-01-10 15:08:15 -0800192 /*
193 * If we have a properly aligned and fully unreserved
194 * BITS_PER_LONG block of pages in front of us, free
195 * it in one go.
196 */
197 if (IS_ALIGNED(start, BITS_PER_LONG) && vec == ~0UL) {
Johannes Weiner41546c12008-07-23 21:28:03 -0700198 int order = ilog2(BITS_PER_LONG);
199
200 __free_pages_bootmem(pfn_to_page(start), order);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700201 count += BITS_PER_LONG;
Johannes Weiner799f9332012-01-10 15:08:15 -0800202 start += BITS_PER_LONG;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700203 } else {
Johannes Weiner41546c12008-07-23 21:28:03 -0700204 unsigned long off = 0;
205
Gavin Shan6dccdcb2012-05-29 15:06:32 -0700206 vec >>= start & (BITS_PER_LONG - 1);
Johannes Weiner549381e2012-05-29 15:06:32 -0700207 while (vec) {
Johannes Weiner41546c12008-07-23 21:28:03 -0700208 if (vec & 1) {
209 page = pfn_to_page(start + off);
210 __free_pages_bootmem(page, 0);
211 count++;
212 }
213 vec >>= 1;
214 off++;
215 }
Johannes Weiner799f9332012-01-10 15:08:15 -0800216 start = ALIGN(start + 1, BITS_PER_LONG);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700217 }
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700218 }
219
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700220 page = virt_to_page(bdata->node_bootmem_map);
Johannes Weiner3560e242008-07-23 21:28:09 -0700221 pages = bdata->node_low_pfn - bdata->node_min_pfn;
Johannes Weiner41546c12008-07-23 21:28:03 -0700222 pages = bootmem_bootmap_pages(pages);
223 count += pages;
Andrew Morton55766462012-11-16 14:15:06 -0800224 while (pages--)
Johannes Weiner41546c12008-07-23 21:28:03 -0700225 __free_pages_bootmem(page++, 0);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700226
Johannes Weiner2e5237d2008-07-23 21:28:02 -0700227 bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
228
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700229 return count;
230}
231
Jiang Liu9feedc92012-12-12 13:52:12 -0800232static void reset_node_lowmem_managed_pages(pg_data_t *pgdat)
233{
234 struct zone *z;
235
236 /*
237 * In free_area_init_core(), highmem zone's managed_pages is set to
238 * present_pages, and bootmem allocator doesn't allocate from highmem
239 * zones. So there's no need to recalculate managed_pages because all
240 * highmem pages will be managed by the buddy system. Here highmem
241 * zone also includes highmem movable zone.
242 */
243 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
244 if (!is_highmem(z))
245 z->managed_pages = 0;
246}
247
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700248/**
249 * free_all_bootmem_node - release a node's free pages to the buddy allocator
250 * @pgdat: node to be released
251 *
252 * Returns the number of pages actually released.
253 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700254unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
255{
256 register_page_bootmem_info_node(pgdat);
Jiang Liu9feedc92012-12-12 13:52:12 -0800257 reset_node_lowmem_managed_pages(pgdat);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700258 return free_all_bootmem_core(pgdat->bdata);
259}
260
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700261/**
262 * free_all_bootmem - release free pages to the buddy allocator
263 *
264 * Returns the number of pages actually released.
265 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700266unsigned long __init free_all_bootmem(void)
267{
Yinghai Luaa235fc2010-03-31 20:45:27 -0700268 unsigned long total_pages = 0;
269 bootmem_data_t *bdata;
Jiang Liu9feedc92012-12-12 13:52:12 -0800270 struct pglist_data *pgdat;
271
272 for_each_online_pgdat(pgdat)
273 reset_node_lowmem_managed_pages(pgdat);
Yinghai Luaa235fc2010-03-31 20:45:27 -0700274
275 list_for_each_entry(bdata, &bdata_list, list)
276 total_pages += free_all_bootmem_core(bdata);
277
278 return total_pages;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700279}
280
Johannes Weinerd747fa42008-07-23 21:28:05 -0700281static void __init __free(bootmem_data_t *bdata,
282 unsigned long sidx, unsigned long eidx)
283{
284 unsigned long idx;
285
286 bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
Johannes Weiner3560e242008-07-23 21:28:09 -0700287 sidx + bdata->node_min_pfn,
288 eidx + bdata->node_min_pfn);
Johannes Weinerd747fa42008-07-23 21:28:05 -0700289
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700290 if (bdata->hint_idx > sidx)
291 bdata->hint_idx = sidx;
292
Johannes Weinerd747fa42008-07-23 21:28:05 -0700293 for (idx = sidx; idx < eidx; idx++)
294 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
295 BUG();
296}
297
298static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
299 unsigned long eidx, int flags)
300{
301 unsigned long idx;
302 int exclusive = flags & BOOTMEM_EXCLUSIVE;
303
304 bdebug("nid=%td start=%lx end=%lx flags=%x\n",
305 bdata - bootmem_node_data,
Johannes Weiner3560e242008-07-23 21:28:09 -0700306 sidx + bdata->node_min_pfn,
307 eidx + bdata->node_min_pfn,
Johannes Weinerd747fa42008-07-23 21:28:05 -0700308 flags);
309
310 for (idx = sidx; idx < eidx; idx++)
311 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
312 if (exclusive) {
313 __free(bdata, sidx, idx);
314 return -EBUSY;
315 }
316 bdebug("silent double reserve of PFN %lx\n",
Johannes Weiner3560e242008-07-23 21:28:09 -0700317 idx + bdata->node_min_pfn);
Johannes Weinerd747fa42008-07-23 21:28:05 -0700318 }
319 return 0;
320}
321
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700322static int __init mark_bootmem_node(bootmem_data_t *bdata,
323 unsigned long start, unsigned long end,
324 int reserve, int flags)
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700325{
326 unsigned long sidx, eidx;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700327
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700328 bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
329 bdata - bootmem_node_data, start, end, reserve, flags);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700330
Johannes Weiner3560e242008-07-23 21:28:09 -0700331 BUG_ON(start < bdata->node_min_pfn);
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700332 BUG_ON(end > bdata->node_low_pfn);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700333
Johannes Weiner3560e242008-07-23 21:28:09 -0700334 sidx = start - bdata->node_min_pfn;
335 eidx = end - bdata->node_min_pfn;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700336
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700337 if (reserve)
338 return __reserve(bdata, sidx, eidx, flags);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700339 else
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700340 __free(bdata, sidx, eidx);
341 return 0;
342}
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700343
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700344static int __init mark_bootmem(unsigned long start, unsigned long end,
345 int reserve, int flags)
346{
347 unsigned long pos;
348 bootmem_data_t *bdata;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700349
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700350 pos = start;
351 list_for_each_entry(bdata, &bdata_list, list) {
352 int err;
353 unsigned long max;
354
Johannes Weiner3560e242008-07-23 21:28:09 -0700355 if (pos < bdata->node_min_pfn ||
356 pos >= bdata->node_low_pfn) {
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700357 BUG_ON(pos != start);
358 continue;
359 }
360
361 max = min(bdata->node_low_pfn, end);
362
363 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
364 if (reserve && err) {
365 mark_bootmem(start, pos, 0, 0);
366 return err;
367 }
368
369 if (max == end)
370 return 0;
371 pos = bdata->node_low_pfn;
372 }
373 BUG();
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700374}
375
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700376/**
377 * free_bootmem_node - mark a page range as usable
378 * @pgdat: node the range resides on
379 * @physaddr: starting address of the range
380 * @size: size of the range in bytes
381 *
382 * Partial pages will be considered reserved and left as they are.
383 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700384 * The range must reside completely on the specified node.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700385 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700386void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
387 unsigned long size)
388{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700389 unsigned long start, end;
390
Catalin Marinasec3a3542009-07-07 10:33:01 +0100391 kmemleak_free_part(__va(physaddr), size);
392
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700393 start = PFN_UP(physaddr);
394 end = PFN_DOWN(physaddr + size);
395
396 mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700397}
398
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700399/**
400 * free_bootmem - mark a page range as usable
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800401 * @addr: starting physical address of the range
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700402 * @size: size of the range in bytes
403 *
404 * Partial pages will be considered reserved and left as they are.
405 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700406 * The range must be contiguous but may span node boundaries.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700407 */
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800408void __init free_bootmem(unsigned long physaddr, unsigned long size)
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700409{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700410 unsigned long start, end;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700411
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800412 kmemleak_free_part(__va(physaddr), size);
Catalin Marinasec3a3542009-07-07 10:33:01 +0100413
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800414 start = PFN_UP(physaddr);
415 end = PFN_DOWN(physaddr + size);
Yinghai Lua5645a62008-03-18 12:49:12 -0700416
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700417 mark_bootmem(start, end, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418}
419
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700420/**
421 * reserve_bootmem_node - mark a page range as reserved
422 * @pgdat: node the range resides on
423 * @physaddr: starting address of the range
424 * @size: size of the range in bytes
425 * @flags: reservation flags (see linux/bootmem.h)
426 *
427 * Partial pages will be reserved.
428 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700429 * The range must reside completely on the specified node.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700430 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700431int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
432 unsigned long size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700434 unsigned long start, end;
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700435
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700436 start = PFN_DOWN(physaddr);
437 end = PFN_UP(physaddr + size);
438
439 return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440}
441
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700442/**
Javi Merino0d4ba4d2012-08-24 18:09:31 +0100443 * reserve_bootmem - mark a page range as reserved
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700444 * @addr: starting address of the range
445 * @size: size of the range in bytes
446 * @flags: reservation flags (see linux/bootmem.h)
447 *
448 * Partial pages will be reserved.
449 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700450 * The range must be contiguous but may span node boundaries.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700451 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700452int __init reserve_bootmem(unsigned long addr, unsigned long size,
453 int flags)
454{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700455 unsigned long start, end;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700456
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700457 start = PFN_DOWN(addr);
458 end = PFN_UP(addr + size);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700459
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700460 return mark_bootmem(start, end, 1, flags);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700461}
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700462
Jan Beulich8aa043d2009-12-14 17:59:46 -0800463static unsigned long __init align_idx(struct bootmem_data *bdata,
464 unsigned long idx, unsigned long step)
Johannes Weiner481ebd02008-08-20 14:09:15 -0700465{
466 unsigned long base = bdata->node_min_pfn;
467
468 /*
469 * Align the index with respect to the node start so that the
470 * combination of both satisfies the requested alignment.
471 */
472
473 return ALIGN(base + idx, step) - base;
474}
475
Jan Beulich8aa043d2009-12-14 17:59:46 -0800476static unsigned long __init align_off(struct bootmem_data *bdata,
477 unsigned long off, unsigned long align)
Johannes Weiner481ebd02008-08-20 14:09:15 -0700478{
479 unsigned long base = PFN_PHYS(bdata->node_min_pfn);
480
481 /* Same as align_idx for byte offsets */
482
483 return ALIGN(base + off, align) - base;
484}
485
Johannes Weinerc6785b62012-05-29 15:06:33 -0700486static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
Tejun Heod0c4f572009-03-01 16:06:56 +0900487 unsigned long size, unsigned long align,
488 unsigned long goal, unsigned long limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489{
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700490 unsigned long fallback = 0;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700491 unsigned long min, max, start, sidx, midx, step;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
Johannes Weiner594fe1a2009-01-06 14:40:32 -0800493 bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
494 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
495 align, goal, limit);
496
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700497 BUG_ON(!size);
498 BUG_ON(align & (align - 1));
499 BUG_ON(limit && goal + size > limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
Christian Krafft7c309a62006-12-06 20:32:41 -0800501 if (!bdata->node_bootmem_map)
502 return NULL;
503
Johannes Weiner3560e242008-07-23 21:28:09 -0700504 min = bdata->node_min_pfn;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700505 max = bdata->node_low_pfn;
Yinghai Lu9a2dc042008-03-18 12:44:48 -0700506
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700507 goal >>= PAGE_SHIFT;
508 limit >>= PAGE_SHIFT;
509
510 if (limit && max > limit)
511 max = limit;
512 if (max <= min)
Yinghai Lu9a2dc042008-03-18 12:44:48 -0700513 return NULL;
514
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700515 step = max(align >> PAGE_SHIFT, 1UL);
Yasunori Goto281dd252005-10-19 15:52:18 -0700516
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700517 if (goal && min < goal && goal < max)
518 start = ALIGN(goal, step);
519 else
520 start = ALIGN(min, step);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Johannes Weiner481ebd02008-08-20 14:09:15 -0700522 sidx = start - bdata->node_min_pfn;
Johannes Weiner3560e242008-07-23 21:28:09 -0700523 midx = max - bdata->node_min_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700525 if (bdata->hint_idx > sidx) {
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700526 /*
527 * Handle the valid case of sidx being zero and still
528 * catch the fallback below.
529 */
530 fallback = sidx + 1;
Johannes Weiner481ebd02008-08-20 14:09:15 -0700531 sidx = align_idx(bdata, bdata->hint_idx, step);
Yinghai Luad093152008-03-10 23:23:42 -0700532 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700534 while (1) {
535 int merge;
536 void *region;
537 unsigned long eidx, i, start_off, end_off;
538find_block:
539 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
Johannes Weiner481ebd02008-08-20 14:09:15 -0700540 sidx = align_idx(bdata, sidx, step);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700541 eidx = sidx + PFN_UP(size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700543 if (sidx >= midx || eidx > midx)
Haren Myneni66d43e92005-12-12 00:37:39 -0800544 break;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700545
546 for (i = sidx; i < eidx; i++)
547 if (test_bit(i, bdata->node_bootmem_map)) {
Johannes Weiner481ebd02008-08-20 14:09:15 -0700548 sidx = align_idx(bdata, i, step);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700549 if (sidx == i)
550 sidx += step;
551 goto find_block;
552 }
553
Mikulas Patocka627240a2008-08-15 00:40:17 -0700554 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700555 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
Johannes Weiner481ebd02008-08-20 14:09:15 -0700556 start_off = align_off(bdata, bdata->last_end_off, align);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700557 else
558 start_off = PFN_PHYS(sidx);
559
560 merge = PFN_DOWN(start_off) < sidx;
561 end_off = start_off + size;
562
563 bdata->last_end_off = end_off;
564 bdata->hint_idx = PFN_UP(end_off);
565
566 /*
567 * Reserve the area now:
568 */
Johannes Weinerd747fa42008-07-23 21:28:05 -0700569 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
570 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
571 BUG();
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700572
Johannes Weiner3560e242008-07-23 21:28:09 -0700573 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
574 start_off);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700575 memset(region, 0, size);
Catalin Marinas008139d2009-08-27 14:29:17 +0100576 /*
577 * The min_count is set to 0 so that bootmem allocated blocks
578 * are never reported as leaks.
579 */
580 kmemleak_alloc(region, size, 0, 0);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700581 return region;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 }
583
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700584 if (fallback) {
Johannes Weiner481ebd02008-08-20 14:09:15 -0700585 sidx = align_idx(bdata, fallback - 1, step);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700586 fallback = 0;
587 goto find_block;
588 }
589
590 return NULL;
591}
592
Johannes Weinerc12ab502012-05-29 15:06:33 -0700593static void * __init alloc_bootmem_core(unsigned long size,
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700594 unsigned long align,
595 unsigned long goal,
596 unsigned long limit)
597{
598 bootmem_data_t *bdata;
Tejun Heod0c4f572009-03-01 16:06:56 +0900599 void *region;
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700600
Joonsoo Kim3f7dfe22012-12-12 13:50:43 -0800601 if (WARN_ON_ONCE(slab_is_available()))
602 return kzalloc(size, GFP_NOWAIT);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700603
Tejun Heod0c4f572009-03-01 16:06:56 +0900604 list_for_each_entry(bdata, &bdata_list, list) {
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700605 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
606 continue;
Johannes Weiner3560e242008-07-23 21:28:09 -0700607 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700608 break;
609
Johannes Weinerc6785b62012-05-29 15:06:33 -0700610 region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700611 if (region)
612 return region;
613 }
614
Johannes Weinerc12ab502012-05-29 15:06:33 -0700615 return NULL;
616}
617
618static void * __init ___alloc_bootmem_nopanic(unsigned long size,
619 unsigned long align,
620 unsigned long goal,
621 unsigned long limit)
622{
623 void *ptr;
624
625restart:
626 ptr = alloc_bootmem_core(size, align, goal, limit);
627 if (ptr)
628 return ptr;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700629 if (goal) {
630 goal = 0;
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700631 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 }
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700633
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635}
636
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700637/**
638 * __alloc_bootmem_nopanic - allocate boot memory without panicking
639 * @size: size of the request in bytes
640 * @align: alignment of the region
641 * @goal: preferred starting address of the region
642 *
643 * The goal is dropped if it can not be satisfied and the allocation will
644 * fall back to memory below @goal.
645 *
646 * Allocation may happen on any node in the system.
647 *
648 * Returns NULL on failure.
649 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700650void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700651 unsigned long goal)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652{
Yinghai Lu08677212010-02-10 01:20:20 -0800653 unsigned long limit = 0;
654
Yinghai Lu08677212010-02-10 01:20:20 -0800655 return ___alloc_bootmem_nopanic(size, align, goal, limit);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700656}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700658static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
659 unsigned long goal, unsigned long limit)
660{
661 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
662
663 if (mem)
664 return mem;
665 /*
666 * Whoops, we cannot satisfy the allocation request.
667 */
668 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
669 panic("Out of memory");
Andi Kleena8062232006-04-07 19:49:21 +0200670 return NULL;
671}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700673/**
674 * __alloc_bootmem - allocate boot memory
675 * @size: size of the request in bytes
676 * @align: alignment of the region
677 * @goal: preferred starting address of the region
678 *
679 * The goal is dropped if it can not be satisfied and the allocation will
680 * fall back to memory below @goal.
681 *
682 * Allocation may happen on any node in the system.
683 *
684 * The function panics if the request can not be satisfied.
685 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700686void * __init __alloc_bootmem(unsigned long size, unsigned long align,
687 unsigned long goal)
Andi Kleena8062232006-04-07 19:49:21 +0200688{
Yinghai Lu08677212010-02-10 01:20:20 -0800689 unsigned long limit = 0;
690
Yinghai Lu08677212010-02-10 01:20:20 -0800691 return ___alloc_bootmem(size, align, goal, limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692}
693
Yinghai Lu99ab7b12012-07-11 14:02:53 -0700694void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
Johannes Weiner4cc278b2008-07-23 21:28:08 -0700695 unsigned long size, unsigned long align,
696 unsigned long goal, unsigned long limit)
697{
698 void *ptr;
699
Joonsoo Kim3f7dfe22012-12-12 13:50:43 -0800700 if (WARN_ON_ONCE(slab_is_available()))
701 return kzalloc(size, GFP_NOWAIT);
Johannes Weinerab381842012-05-29 15:06:34 -0700702again:
Tejun Heod0c4f572009-03-01 16:06:56 +0900703
Yinghai Luc8f4a2d2012-07-17 15:47:51 -0700704 /* do not panic in alloc_bootmem_bdata() */
705 if (limit && goal + size > limit)
706 limit = 0;
707
Johannes Weinere9079912012-05-29 15:06:36 -0700708 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
Johannes Weiner4cc278b2008-07-23 21:28:08 -0700709 if (ptr)
710 return ptr;
711
Johannes Weinerab381842012-05-29 15:06:34 -0700712 ptr = alloc_bootmem_core(size, align, goal, limit);
713 if (ptr)
714 return ptr;
715
716 if (goal) {
717 goal = 0;
718 goto again;
719 }
720
Johannes Weiner421456e2012-05-29 15:06:34 -0700721 return NULL;
722}
723
724void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
725 unsigned long align, unsigned long goal)
726{
727 if (WARN_ON_ONCE(slab_is_available()))
728 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
729
Johannes Weinere9079912012-05-29 15:06:36 -0700730 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
Johannes Weiner421456e2012-05-29 15:06:34 -0700731}
732
Johannes Weinere9079912012-05-29 15:06:36 -0700733void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
Johannes Weiner421456e2012-05-29 15:06:34 -0700734 unsigned long align, unsigned long goal,
735 unsigned long limit)
736{
737 void *ptr;
738
Johannes Weinere9079912012-05-29 15:06:36 -0700739 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
Johannes Weiner421456e2012-05-29 15:06:34 -0700740 if (ptr)
741 return ptr;
742
Johannes Weinerab381842012-05-29 15:06:34 -0700743 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
744 panic("Out of memory");
745 return NULL;
Johannes Weiner4cc278b2008-07-23 21:28:08 -0700746}
747
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700748/**
749 * __alloc_bootmem_node - allocate boot memory from a specific node
750 * @pgdat: node to allocate from
751 * @size: size of the request in bytes
752 * @align: alignment of the region
753 * @goal: preferred starting address of the region
754 *
755 * The goal is dropped if it can not be satisfied and the allocation will
756 * fall back to memory below @goal.
757 *
758 * Allocation may fall back to any node in the system if the specified node
759 * can not hold the requested memory.
760 *
761 * The function panics if the request can not be satisfied.
762 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700763void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
764 unsigned long align, unsigned long goal)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765{
Pekka Enbergc91c4772009-06-11 08:10:28 +0300766 if (WARN_ON_ONCE(slab_is_available()))
767 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
768
Johannes Weinere9079912012-05-29 15:06:36 -0700769 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
Yinghai Lu08677212010-02-10 01:20:20 -0800770}
771
772void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
773 unsigned long align, unsigned long goal)
774{
775#ifdef MAX_DMA32_PFN
776 unsigned long end_pfn;
777
778 if (WARN_ON_ONCE(slab_is_available()))
779 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
780
781 /* update goal according ...MAX_DMA32_PFN */
782 end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
783
784 if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
785 (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
786 void *ptr;
787 unsigned long new_goal;
788
789 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
Johannes Weinerc6785b62012-05-29 15:06:33 -0700790 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
Yinghai Lu08677212010-02-10 01:20:20 -0800791 new_goal, 0);
Yinghai Lu08677212010-02-10 01:20:20 -0800792 if (ptr)
793 return ptr;
794 }
795#endif
796
797 return __alloc_bootmem_node(pgdat, size, align, goal);
798
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799}
800
Heiko Carstensdfd54cb2006-09-25 23:31:33 -0700801#ifndef ARCH_LOW_ADDRESS_LIMIT
802#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
803#endif
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800804
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700805/**
806 * __alloc_bootmem_low - allocate low boot memory
807 * @size: size of the request in bytes
808 * @align: alignment of the region
809 * @goal: preferred starting address of the region
810 *
811 * The goal is dropped if it can not be satisfied and the allocation will
812 * fall back to memory below @goal.
813 *
814 * Allocation may happen on any node in the system.
815 *
816 * The function panics if the request can not be satisfied.
817 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700818void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
819 unsigned long goal)
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800820{
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700821 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800822}
823
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700824/**
825 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
826 * @pgdat: node to allocate from
827 * @size: size of the request in bytes
828 * @align: alignment of the region
829 * @goal: preferred starting address of the region
830 *
831 * The goal is dropped if it can not be satisfied and the allocation will
832 * fall back to memory below @goal.
833 *
834 * Allocation may fall back to any node in the system if the specified node
835 * can not hold the requested memory.
836 *
837 * The function panics if the request can not be satisfied.
838 */
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800839void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
840 unsigned long align, unsigned long goal)
841{
Pekka Enbergc91c4772009-06-11 08:10:28 +0300842 if (WARN_ON_ONCE(slab_is_available()))
843 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
844
Johannes Weinere9079912012-05-29 15:06:36 -0700845 return ___alloc_bootmem_node(pgdat, size, align,
846 goal, ARCH_LOW_ADDRESS_LIMIT);
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800847}