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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>
Paul McQuaded85fbee2014-10-09 15:29:05 -070019#include <linux/bug.h>
20#include <linux/io.h>
Franck Bui-Huue786e862006-09-25 23:31:06 -070021
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;
Daeseok Youn4a099fb2013-11-12 15:08:14 -0800175 unsigned long *map, 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
Daeseok Youn4a099fb2013-11-12 15:08:14 -0800180 map = bdata->node_bootmem_map;
Johannes Weiner3560e242008-07-23 21:28:09 -0700181 start = bdata->node_min_pfn;
Johannes Weiner41546c12008-07-23 21:28:03 -0700182 end = bdata->node_low_pfn;
183
Johannes Weiner799f9332012-01-10 15:08:15 -0800184 bdebug("nid=%td start=%lx end=%lx\n",
185 bdata - bootmem_node_data, start, end);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700186
Johannes Weiner41546c12008-07-23 21:28:03 -0700187 while (start < end) {
Daeseok Youn4a099fb2013-11-12 15:08:14 -0800188 unsigned long idx, vec;
Max Filippov10d73e62013-01-11 14:31:52 -0800189 unsigned shift;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700190
Johannes Weiner3560e242008-07-23 21:28:09 -0700191 idx = start - bdata->node_min_pfn;
Max Filippov10d73e62013-01-11 14:31:52 -0800192 shift = idx & (BITS_PER_LONG - 1);
193 /*
194 * vec holds at most BITS_PER_LONG map bits,
195 * bit 0 corresponds to start.
196 */
Johannes Weiner41546c12008-07-23 21:28:03 -0700197 vec = ~map[idx / BITS_PER_LONG];
Max Filippov10d73e62013-01-11 14:31:52 -0800198
199 if (shift) {
200 vec >>= shift;
201 if (end - start >= BITS_PER_LONG)
202 vec |= ~map[idx / BITS_PER_LONG + 1] <<
203 (BITS_PER_LONG - shift);
204 }
Johannes Weiner799f9332012-01-10 15:08:15 -0800205 /*
206 * If we have a properly aligned and fully unreserved
207 * BITS_PER_LONG block of pages in front of us, free
208 * it in one go.
209 */
210 if (IS_ALIGNED(start, BITS_PER_LONG) && vec == ~0UL) {
Johannes Weiner41546c12008-07-23 21:28:03 -0700211 int order = ilog2(BITS_PER_LONG);
212
213 __free_pages_bootmem(pfn_to_page(start), order);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700214 count += BITS_PER_LONG;
Johannes Weiner799f9332012-01-10 15:08:15 -0800215 start += BITS_PER_LONG;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700216 } else {
Max Filippov10d73e62013-01-11 14:31:52 -0800217 unsigned long cur = start;
Johannes Weiner41546c12008-07-23 21:28:03 -0700218
Max Filippov10d73e62013-01-11 14:31:52 -0800219 start = ALIGN(start + 1, BITS_PER_LONG);
220 while (vec && cur != start) {
Johannes Weiner41546c12008-07-23 21:28:03 -0700221 if (vec & 1) {
Max Filippov10d73e62013-01-11 14:31:52 -0800222 page = pfn_to_page(cur);
Johannes Weiner41546c12008-07-23 21:28:03 -0700223 __free_pages_bootmem(page, 0);
224 count++;
225 }
226 vec >>= 1;
Max Filippov10d73e62013-01-11 14:31:52 -0800227 ++cur;
Johannes Weiner41546c12008-07-23 21:28:03 -0700228 }
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700229 }
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700230 }
231
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700232 page = virt_to_page(bdata->node_bootmem_map);
Johannes Weiner3560e242008-07-23 21:28:09 -0700233 pages = bdata->node_low_pfn - bdata->node_min_pfn;
Johannes Weiner41546c12008-07-23 21:28:03 -0700234 pages = bootmem_bootmap_pages(pages);
235 count += pages;
Andrew Morton55766462012-11-16 14:15:06 -0800236 while (pages--)
Johannes Weiner41546c12008-07-23 21:28:03 -0700237 __free_pages_bootmem(page++, 0);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700238
Johannes Weiner2e5237d2008-07-23 21:28:02 -0700239 bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
240
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700241 return count;
242}
243
Jiang Liu7b4b2a02013-07-03 15:03:11 -0700244static int reset_managed_pages_done __initdata;
245
246static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
Jiang Liu9feedc92012-12-12 13:52:12 -0800247{
248 struct zone *z;
249
Jiang Liu7b4b2a02013-07-03 15:03:11 -0700250 if (reset_managed_pages_done)
251 return;
252
Jiang Liu9feedc92012-12-12 13:52:12 -0800253 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
Jiang Liu7b4b2a02013-07-03 15:03:11 -0700254 z->managed_pages = 0;
255}
256
257void __init reset_all_zones_managed_pages(void)
258{
259 struct pglist_data *pgdat;
260
261 for_each_online_pgdat(pgdat)
262 reset_node_managed_pages(pgdat);
263 reset_managed_pages_done = 1;
Jiang Liu9feedc92012-12-12 13:52:12 -0800264}
265
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700266/**
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700267 * free_all_bootmem - release free pages to the buddy allocator
268 *
269 * Returns the number of pages actually released.
270 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700271unsigned long __init free_all_bootmem(void)
272{
Yinghai Luaa235fc2010-03-31 20:45:27 -0700273 unsigned long total_pages = 0;
274 bootmem_data_t *bdata;
Jiang Liu9feedc92012-12-12 13:52:12 -0800275
Jiang Liu7b4b2a02013-07-03 15:03:11 -0700276 reset_all_zones_managed_pages();
Yinghai Luaa235fc2010-03-31 20:45:27 -0700277
278 list_for_each_entry(bdata, &bdata_list, list)
279 total_pages += free_all_bootmem_core(bdata);
280
Jiang Liu0c988532013-07-03 15:03:24 -0700281 totalram_pages += total_pages;
282
Yinghai Luaa235fc2010-03-31 20:45:27 -0700283 return total_pages;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700284}
285
Johannes Weinerd747fa42008-07-23 21:28:05 -0700286static void __init __free(bootmem_data_t *bdata,
287 unsigned long sidx, unsigned long eidx)
288{
289 unsigned long idx;
290
291 bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
Johannes Weiner3560e242008-07-23 21:28:09 -0700292 sidx + bdata->node_min_pfn,
293 eidx + bdata->node_min_pfn);
Johannes Weinerd747fa42008-07-23 21:28:05 -0700294
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700295 if (bdata->hint_idx > sidx)
296 bdata->hint_idx = sidx;
297
Johannes Weinerd747fa42008-07-23 21:28:05 -0700298 for (idx = sidx; idx < eidx; idx++)
299 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
300 BUG();
301}
302
303static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
304 unsigned long eidx, int flags)
305{
306 unsigned long idx;
307 int exclusive = flags & BOOTMEM_EXCLUSIVE;
308
309 bdebug("nid=%td start=%lx end=%lx flags=%x\n",
310 bdata - bootmem_node_data,
Johannes Weiner3560e242008-07-23 21:28:09 -0700311 sidx + bdata->node_min_pfn,
312 eidx + bdata->node_min_pfn,
Johannes Weinerd747fa42008-07-23 21:28:05 -0700313 flags);
314
315 for (idx = sidx; idx < eidx; idx++)
316 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
317 if (exclusive) {
318 __free(bdata, sidx, idx);
319 return -EBUSY;
320 }
321 bdebug("silent double reserve of PFN %lx\n",
Johannes Weiner3560e242008-07-23 21:28:09 -0700322 idx + bdata->node_min_pfn);
Johannes Weinerd747fa42008-07-23 21:28:05 -0700323 }
324 return 0;
325}
326
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700327static int __init mark_bootmem_node(bootmem_data_t *bdata,
328 unsigned long start, unsigned long end,
329 int reserve, int flags)
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700330{
331 unsigned long sidx, eidx;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700332
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700333 bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
334 bdata - bootmem_node_data, start, end, reserve, flags);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700335
Johannes Weiner3560e242008-07-23 21:28:09 -0700336 BUG_ON(start < bdata->node_min_pfn);
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700337 BUG_ON(end > bdata->node_low_pfn);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700338
Johannes Weiner3560e242008-07-23 21:28:09 -0700339 sidx = start - bdata->node_min_pfn;
340 eidx = end - bdata->node_min_pfn;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700341
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700342 if (reserve)
343 return __reserve(bdata, sidx, eidx, flags);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700344 else
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700345 __free(bdata, sidx, eidx);
346 return 0;
347}
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700348
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700349static int __init mark_bootmem(unsigned long start, unsigned long end,
350 int reserve, int flags)
351{
352 unsigned long pos;
353 bootmem_data_t *bdata;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700354
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700355 pos = start;
356 list_for_each_entry(bdata, &bdata_list, list) {
357 int err;
358 unsigned long max;
359
Johannes Weiner3560e242008-07-23 21:28:09 -0700360 if (pos < bdata->node_min_pfn ||
361 pos >= bdata->node_low_pfn) {
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700362 BUG_ON(pos != start);
363 continue;
364 }
365
366 max = min(bdata->node_low_pfn, end);
367
368 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
369 if (reserve && err) {
370 mark_bootmem(start, pos, 0, 0);
371 return err;
372 }
373
374 if (max == end)
375 return 0;
376 pos = bdata->node_low_pfn;
377 }
378 BUG();
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700379}
380
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700381/**
382 * free_bootmem_node - mark a page range as usable
383 * @pgdat: node the range resides on
384 * @physaddr: starting address of the range
385 * @size: size of the range in bytes
386 *
387 * Partial pages will be considered reserved and left as they are.
388 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700389 * The range must reside completely on the specified node.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700390 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700391void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
392 unsigned long size)
393{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700394 unsigned long start, end;
395
Catalin Marinasec3a3542009-07-07 10:33:01 +0100396 kmemleak_free_part(__va(physaddr), size);
397
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700398 start = PFN_UP(physaddr);
399 end = PFN_DOWN(physaddr + size);
400
401 mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700402}
403
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700404/**
405 * free_bootmem - mark a page range as usable
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800406 * @addr: starting physical address of the range
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700407 * @size: size of the range in bytes
408 *
409 * Partial pages will be considered reserved and left as they are.
410 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700411 * The range must be contiguous but may span node boundaries.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700412 */
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800413void __init free_bootmem(unsigned long physaddr, unsigned long size)
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700414{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700415 unsigned long start, end;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700416
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800417 kmemleak_free_part(__va(physaddr), size);
Catalin Marinasec3a3542009-07-07 10:33:01 +0100418
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800419 start = PFN_UP(physaddr);
420 end = PFN_DOWN(physaddr + size);
Yinghai Lua5645a62008-03-18 12:49:12 -0700421
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700422 mark_bootmem(start, end, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423}
424
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700425/**
426 * reserve_bootmem_node - mark a page range as reserved
427 * @pgdat: node the range resides on
428 * @physaddr: starting address of the range
429 * @size: size of the range in bytes
430 * @flags: reservation flags (see linux/bootmem.h)
431 *
432 * Partial pages will be reserved.
433 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700434 * The range must reside completely on the specified node.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700435 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700436int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
437 unsigned long size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700439 unsigned long start, end;
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700440
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700441 start = PFN_DOWN(physaddr);
442 end = PFN_UP(physaddr + size);
443
444 return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445}
446
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700447/**
Javi Merino0d4ba4d2012-08-24 18:09:31 +0100448 * reserve_bootmem - mark a page range as reserved
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700449 * @addr: starting address of the range
450 * @size: size of the range in bytes
451 * @flags: reservation flags (see linux/bootmem.h)
452 *
453 * Partial pages will be reserved.
454 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700455 * The range must be contiguous but may span node boundaries.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700456 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700457int __init reserve_bootmem(unsigned long addr, unsigned long size,
458 int flags)
459{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700460 unsigned long start, end;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700461
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700462 start = PFN_DOWN(addr);
463 end = PFN_UP(addr + size);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700464
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700465 return mark_bootmem(start, end, 1, flags);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700466}
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700467
Jan Beulich8aa043d2009-12-14 17:59:46 -0800468static unsigned long __init align_idx(struct bootmem_data *bdata,
469 unsigned long idx, unsigned long step)
Johannes Weiner481ebd02008-08-20 14:09:15 -0700470{
471 unsigned long base = bdata->node_min_pfn;
472
473 /*
474 * Align the index with respect to the node start so that the
475 * combination of both satisfies the requested alignment.
476 */
477
478 return ALIGN(base + idx, step) - base;
479}
480
Jan Beulich8aa043d2009-12-14 17:59:46 -0800481static unsigned long __init align_off(struct bootmem_data *bdata,
482 unsigned long off, unsigned long align)
Johannes Weiner481ebd02008-08-20 14:09:15 -0700483{
484 unsigned long base = PFN_PHYS(bdata->node_min_pfn);
485
486 /* Same as align_idx for byte offsets */
487
488 return ALIGN(base + off, align) - base;
489}
490
Johannes Weinerc6785b62012-05-29 15:06:33 -0700491static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
Tejun Heod0c4f572009-03-01 16:06:56 +0900492 unsigned long size, unsigned long align,
493 unsigned long goal, unsigned long limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494{
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700495 unsigned long fallback = 0;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700496 unsigned long min, max, start, sidx, midx, step;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Johannes Weiner594fe1a2009-01-06 14:40:32 -0800498 bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
499 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
500 align, goal, limit);
501
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700502 BUG_ON(!size);
503 BUG_ON(align & (align - 1));
504 BUG_ON(limit && goal + size > limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
Christian Krafft7c309a62006-12-06 20:32:41 -0800506 if (!bdata->node_bootmem_map)
507 return NULL;
508
Johannes Weiner3560e242008-07-23 21:28:09 -0700509 min = bdata->node_min_pfn;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700510 max = bdata->node_low_pfn;
Yinghai Lu9a2dc042008-03-18 12:44:48 -0700511
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700512 goal >>= PAGE_SHIFT;
513 limit >>= PAGE_SHIFT;
514
515 if (limit && max > limit)
516 max = limit;
517 if (max <= min)
Yinghai Lu9a2dc042008-03-18 12:44:48 -0700518 return NULL;
519
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700520 step = max(align >> PAGE_SHIFT, 1UL);
Yasunori Goto281dd252005-10-19 15:52:18 -0700521
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700522 if (goal && min < goal && goal < max)
523 start = ALIGN(goal, step);
524 else
525 start = ALIGN(min, step);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
Johannes Weiner481ebd02008-08-20 14:09:15 -0700527 sidx = start - bdata->node_min_pfn;
Johannes Weiner3560e242008-07-23 21:28:09 -0700528 midx = max - bdata->node_min_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700530 if (bdata->hint_idx > sidx) {
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700531 /*
532 * Handle the valid case of sidx being zero and still
533 * catch the fallback below.
534 */
535 fallback = sidx + 1;
Johannes Weiner481ebd02008-08-20 14:09:15 -0700536 sidx = align_idx(bdata, bdata->hint_idx, step);
Yinghai Luad093152008-03-10 23:23:42 -0700537 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700539 while (1) {
540 int merge;
541 void *region;
542 unsigned long eidx, i, start_off, end_off;
543find_block:
544 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
Johannes Weiner481ebd02008-08-20 14:09:15 -0700545 sidx = align_idx(bdata, sidx, step);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700546 eidx = sidx + PFN_UP(size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700548 if (sidx >= midx || eidx > midx)
Haren Myneni66d43e92005-12-12 00:37:39 -0800549 break;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700550
551 for (i = sidx; i < eidx; i++)
552 if (test_bit(i, bdata->node_bootmem_map)) {
Johannes Weiner481ebd02008-08-20 14:09:15 -0700553 sidx = align_idx(bdata, i, step);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700554 if (sidx == i)
555 sidx += step;
556 goto find_block;
557 }
558
Mikulas Patocka627240a2008-08-15 00:40:17 -0700559 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700560 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
Johannes Weiner481ebd02008-08-20 14:09:15 -0700561 start_off = align_off(bdata, bdata->last_end_off, align);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700562 else
563 start_off = PFN_PHYS(sidx);
564
565 merge = PFN_DOWN(start_off) < sidx;
566 end_off = start_off + size;
567
568 bdata->last_end_off = end_off;
569 bdata->hint_idx = PFN_UP(end_off);
570
571 /*
572 * Reserve the area now:
573 */
Johannes Weinerd747fa42008-07-23 21:28:05 -0700574 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
575 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
576 BUG();
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700577
Johannes Weiner3560e242008-07-23 21:28:09 -0700578 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
579 start_off);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700580 memset(region, 0, size);
Catalin Marinas008139d2009-08-27 14:29:17 +0100581 /*
582 * The min_count is set to 0 so that bootmem allocated blocks
583 * are never reported as leaks.
584 */
585 kmemleak_alloc(region, size, 0, 0);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700586 return region;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 }
588
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700589 if (fallback) {
Johannes Weiner481ebd02008-08-20 14:09:15 -0700590 sidx = align_idx(bdata, fallback - 1, step);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700591 fallback = 0;
592 goto find_block;
593 }
594
595 return NULL;
596}
597
Johannes Weinerc12ab502012-05-29 15:06:33 -0700598static void * __init alloc_bootmem_core(unsigned long size,
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700599 unsigned long align,
600 unsigned long goal,
601 unsigned long limit)
602{
603 bootmem_data_t *bdata;
Tejun Heod0c4f572009-03-01 16:06:56 +0900604 void *region;
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700605
Joonsoo Kim3f7dfe22012-12-12 13:50:43 -0800606 if (WARN_ON_ONCE(slab_is_available()))
607 return kzalloc(size, GFP_NOWAIT);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700608
Tejun Heod0c4f572009-03-01 16:06:56 +0900609 list_for_each_entry(bdata, &bdata_list, list) {
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700610 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
611 continue;
Johannes Weiner3560e242008-07-23 21:28:09 -0700612 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700613 break;
614
Johannes Weinerc6785b62012-05-29 15:06:33 -0700615 region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700616 if (region)
617 return region;
618 }
619
Johannes Weinerc12ab502012-05-29 15:06:33 -0700620 return NULL;
621}
622
623static void * __init ___alloc_bootmem_nopanic(unsigned long size,
624 unsigned long align,
625 unsigned long goal,
626 unsigned long limit)
627{
628 void *ptr;
629
630restart:
631 ptr = alloc_bootmem_core(size, align, goal, limit);
632 if (ptr)
633 return ptr;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700634 if (goal) {
635 goal = 0;
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700636 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 }
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700638
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640}
641
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700642/**
643 * __alloc_bootmem_nopanic - allocate boot memory without panicking
644 * @size: size of the request in bytes
645 * @align: alignment of the region
646 * @goal: preferred starting address of the region
647 *
648 * The goal is dropped if it can not be satisfied and the allocation will
649 * fall back to memory below @goal.
650 *
651 * Allocation may happen on any node in the system.
652 *
653 * Returns NULL on failure.
654 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700655void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700656 unsigned long goal)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657{
Yinghai Lu08677212010-02-10 01:20:20 -0800658 unsigned long limit = 0;
659
Yinghai Lu08677212010-02-10 01:20:20 -0800660 return ___alloc_bootmem_nopanic(size, align, goal, limit);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700661}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700663static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
664 unsigned long goal, unsigned long limit)
665{
666 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
667
668 if (mem)
669 return mem;
670 /*
671 * Whoops, we cannot satisfy the allocation request.
672 */
673 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
674 panic("Out of memory");
Andi Kleena8062232006-04-07 19:49:21 +0200675 return NULL;
676}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700678/**
679 * __alloc_bootmem - allocate boot memory
680 * @size: size of the request in bytes
681 * @align: alignment of the region
682 * @goal: preferred starting address of the region
683 *
684 * The goal is dropped if it can not be satisfied and the allocation will
685 * fall back to memory below @goal.
686 *
687 * Allocation may happen on any node in the system.
688 *
689 * The function panics if the request can not be satisfied.
690 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700691void * __init __alloc_bootmem(unsigned long size, unsigned long align,
692 unsigned long goal)
Andi Kleena8062232006-04-07 19:49:21 +0200693{
Yinghai Lu08677212010-02-10 01:20:20 -0800694 unsigned long limit = 0;
695
Yinghai Lu08677212010-02-10 01:20:20 -0800696 return ___alloc_bootmem(size, align, goal, limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697}
698
Yinghai Lu99ab7b12012-07-11 14:02:53 -0700699void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
Johannes Weiner4cc278b2008-07-23 21:28:08 -0700700 unsigned long size, unsigned long align,
701 unsigned long goal, unsigned long limit)
702{
703 void *ptr;
704
Joonsoo Kim3f7dfe22012-12-12 13:50:43 -0800705 if (WARN_ON_ONCE(slab_is_available()))
706 return kzalloc(size, GFP_NOWAIT);
Johannes Weinerab381842012-05-29 15:06:34 -0700707again:
Tejun Heod0c4f572009-03-01 16:06:56 +0900708
Yinghai Luc8f4a2d2012-07-17 15:47:51 -0700709 /* do not panic in alloc_bootmem_bdata() */
710 if (limit && goal + size > limit)
711 limit = 0;
712
Johannes Weinere9079912012-05-29 15:06:36 -0700713 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
Johannes Weiner4cc278b2008-07-23 21:28:08 -0700714 if (ptr)
715 return ptr;
716
Johannes Weinerab381842012-05-29 15:06:34 -0700717 ptr = alloc_bootmem_core(size, align, goal, limit);
718 if (ptr)
719 return ptr;
720
721 if (goal) {
722 goal = 0;
723 goto again;
724 }
725
Johannes Weiner421456e2012-05-29 15:06:34 -0700726 return NULL;
727}
728
729void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
730 unsigned long align, unsigned long goal)
731{
732 if (WARN_ON_ONCE(slab_is_available()))
733 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
734
Johannes Weinere9079912012-05-29 15:06:36 -0700735 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
Johannes Weiner421456e2012-05-29 15:06:34 -0700736}
737
Johannes Weinere9079912012-05-29 15:06:36 -0700738void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
Johannes Weiner421456e2012-05-29 15:06:34 -0700739 unsigned long align, unsigned long goal,
740 unsigned long limit)
741{
742 void *ptr;
743
Johannes Weinere9079912012-05-29 15:06:36 -0700744 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
Johannes Weiner421456e2012-05-29 15:06:34 -0700745 if (ptr)
746 return ptr;
747
Johannes Weinerab381842012-05-29 15:06:34 -0700748 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
749 panic("Out of memory");
750 return NULL;
Johannes Weiner4cc278b2008-07-23 21:28:08 -0700751}
752
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700753/**
754 * __alloc_bootmem_node - allocate boot memory from a specific node
755 * @pgdat: node to allocate from
756 * @size: size of the request in bytes
757 * @align: alignment of the region
758 * @goal: preferred starting address of the region
759 *
760 * The goal is dropped if it can not be satisfied and the allocation will
761 * fall back to memory below @goal.
762 *
763 * Allocation may fall back to any node in the system if the specified node
764 * can not hold the requested memory.
765 *
766 * The function panics if the request can not be satisfied.
767 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700768void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
769 unsigned long align, unsigned long goal)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770{
Pekka Enbergc91c4772009-06-11 08:10:28 +0300771 if (WARN_ON_ONCE(slab_is_available()))
772 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
773
Johannes Weinere9079912012-05-29 15:06:36 -0700774 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
Yinghai Lu08677212010-02-10 01:20:20 -0800775}
776
777void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
778 unsigned long align, unsigned long goal)
779{
780#ifdef MAX_DMA32_PFN
781 unsigned long end_pfn;
782
783 if (WARN_ON_ONCE(slab_is_available()))
784 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
785
786 /* update goal according ...MAX_DMA32_PFN */
Xishi Qiu83285c72013-11-12 15:07:19 -0800787 end_pfn = pgdat_end_pfn(pgdat);
Yinghai Lu08677212010-02-10 01:20:20 -0800788
789 if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
790 (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
791 void *ptr;
792 unsigned long new_goal;
793
794 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
Johannes Weinerc6785b62012-05-29 15:06:33 -0700795 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
Yinghai Lu08677212010-02-10 01:20:20 -0800796 new_goal, 0);
Yinghai Lu08677212010-02-10 01:20:20 -0800797 if (ptr)
798 return ptr;
799 }
800#endif
801
802 return __alloc_bootmem_node(pgdat, size, align, goal);
803
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804}
805
Heiko Carstensdfd54cb2006-09-25 23:31:33 -0700806#ifndef ARCH_LOW_ADDRESS_LIMIT
807#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
808#endif
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800809
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700810/**
811 * __alloc_bootmem_low - allocate low boot memory
812 * @size: size of the request in bytes
813 * @align: alignment of the region
814 * @goal: preferred starting address of the region
815 *
816 * The goal is dropped if it can not be satisfied and the allocation will
817 * fall back to memory below @goal.
818 *
819 * Allocation may happen on any node in the system.
820 *
821 * The function panics if the request can not be satisfied.
822 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700823void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
824 unsigned long goal)
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800825{
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700826 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800827}
828
Yinghai Lu38fa4172013-01-24 12:20:15 -0800829void * __init __alloc_bootmem_low_nopanic(unsigned long size,
830 unsigned long align,
831 unsigned long goal)
832{
833 return ___alloc_bootmem_nopanic(size, align, goal,
834 ARCH_LOW_ADDRESS_LIMIT);
835}
836
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700837/**
838 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
839 * @pgdat: node to allocate from
840 * @size: size of the request in bytes
841 * @align: alignment of the region
842 * @goal: preferred starting address of the region
843 *
844 * The goal is dropped if it can not be satisfied and the allocation will
845 * fall back to memory below @goal.
846 *
847 * Allocation may fall back to any node in the system if the specified node
848 * can not hold the requested memory.
849 *
850 * The function panics if the request can not be satisfied.
851 */
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800852void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
853 unsigned long align, unsigned long goal)
854{
Pekka Enbergc91c4772009-06-11 08:10:28 +0300855 if (WARN_ON_ONCE(slab_is_available()))
856 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
857
Johannes Weinere9079912012-05-29 15:06:36 -0700858 return ___alloc_bootmem_node(pgdat, size, align,
859 goal, ARCH_LOW_ADDRESS_LIMIT);
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800860}