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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;
Max Filippov10d73e62013-01-11 14:31:52 -0800188 unsigned shift;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700189
Johannes Weiner41546c12008-07-23 21:28:03 -0700190 map = bdata->node_bootmem_map;
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 Liu9feedc92012-12-12 13:52:12 -0800244static void reset_node_lowmem_managed_pages(pg_data_t *pgdat)
245{
246 struct zone *z;
247
248 /*
249 * In free_area_init_core(), highmem zone's managed_pages is set to
250 * present_pages, and bootmem allocator doesn't allocate from highmem
251 * zones. So there's no need to recalculate managed_pages because all
252 * highmem pages will be managed by the buddy system. Here highmem
253 * zone also includes highmem movable zone.
254 */
255 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
256 if (!is_highmem(z))
257 z->managed_pages = 0;
258}
259
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700260/**
261 * free_all_bootmem_node - release a node's free pages to the buddy allocator
262 * @pgdat: node to be released
263 *
264 * Returns the number of pages actually released.
265 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700266unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
267{
268 register_page_bootmem_info_node(pgdat);
Jiang Liu9feedc92012-12-12 13:52:12 -0800269 reset_node_lowmem_managed_pages(pgdat);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700270 return free_all_bootmem_core(pgdat->bdata);
271}
272
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700273/**
274 * free_all_bootmem - release free pages to the buddy allocator
275 *
276 * Returns the number of pages actually released.
277 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700278unsigned long __init free_all_bootmem(void)
279{
Yinghai Luaa235fc2010-03-31 20:45:27 -0700280 unsigned long total_pages = 0;
281 bootmem_data_t *bdata;
Jiang Liu9feedc92012-12-12 13:52:12 -0800282 struct pglist_data *pgdat;
283
284 for_each_online_pgdat(pgdat)
285 reset_node_lowmem_managed_pages(pgdat);
Yinghai Luaa235fc2010-03-31 20:45:27 -0700286
287 list_for_each_entry(bdata, &bdata_list, list)
288 total_pages += free_all_bootmem_core(bdata);
289
290 return total_pages;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700291}
292
Johannes Weinerd747fa42008-07-23 21:28:05 -0700293static void __init __free(bootmem_data_t *bdata,
294 unsigned long sidx, unsigned long eidx)
295{
296 unsigned long idx;
297
298 bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
Johannes Weiner3560e242008-07-23 21:28:09 -0700299 sidx + bdata->node_min_pfn,
300 eidx + bdata->node_min_pfn);
Johannes Weinerd747fa42008-07-23 21:28:05 -0700301
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700302 if (bdata->hint_idx > sidx)
303 bdata->hint_idx = sidx;
304
Johannes Weinerd747fa42008-07-23 21:28:05 -0700305 for (idx = sidx; idx < eidx; idx++)
306 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
307 BUG();
308}
309
310static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
311 unsigned long eidx, int flags)
312{
313 unsigned long idx;
314 int exclusive = flags & BOOTMEM_EXCLUSIVE;
315
316 bdebug("nid=%td start=%lx end=%lx flags=%x\n",
317 bdata - bootmem_node_data,
Johannes Weiner3560e242008-07-23 21:28:09 -0700318 sidx + bdata->node_min_pfn,
319 eidx + bdata->node_min_pfn,
Johannes Weinerd747fa42008-07-23 21:28:05 -0700320 flags);
321
322 for (idx = sidx; idx < eidx; idx++)
323 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
324 if (exclusive) {
325 __free(bdata, sidx, idx);
326 return -EBUSY;
327 }
328 bdebug("silent double reserve of PFN %lx\n",
Johannes Weiner3560e242008-07-23 21:28:09 -0700329 idx + bdata->node_min_pfn);
Johannes Weinerd747fa42008-07-23 21:28:05 -0700330 }
331 return 0;
332}
333
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700334static int __init mark_bootmem_node(bootmem_data_t *bdata,
335 unsigned long start, unsigned long end,
336 int reserve, int flags)
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700337{
338 unsigned long sidx, eidx;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700339
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700340 bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
341 bdata - bootmem_node_data, start, end, reserve, flags);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700342
Johannes Weiner3560e242008-07-23 21:28:09 -0700343 BUG_ON(start < bdata->node_min_pfn);
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700344 BUG_ON(end > bdata->node_low_pfn);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700345
Johannes Weiner3560e242008-07-23 21:28:09 -0700346 sidx = start - bdata->node_min_pfn;
347 eidx = end - bdata->node_min_pfn;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700348
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700349 if (reserve)
350 return __reserve(bdata, sidx, eidx, flags);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700351 else
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700352 __free(bdata, sidx, eidx);
353 return 0;
354}
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700355
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700356static int __init mark_bootmem(unsigned long start, unsigned long end,
357 int reserve, int flags)
358{
359 unsigned long pos;
360 bootmem_data_t *bdata;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700361
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700362 pos = start;
363 list_for_each_entry(bdata, &bdata_list, list) {
364 int err;
365 unsigned long max;
366
Johannes Weiner3560e242008-07-23 21:28:09 -0700367 if (pos < bdata->node_min_pfn ||
368 pos >= bdata->node_low_pfn) {
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700369 BUG_ON(pos != start);
370 continue;
371 }
372
373 max = min(bdata->node_low_pfn, end);
374
375 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
376 if (reserve && err) {
377 mark_bootmem(start, pos, 0, 0);
378 return err;
379 }
380
381 if (max == end)
382 return 0;
383 pos = bdata->node_low_pfn;
384 }
385 BUG();
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700386}
387
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700388/**
389 * free_bootmem_node - mark a page range as usable
390 * @pgdat: node the range resides on
391 * @physaddr: starting address of the range
392 * @size: size of the range in bytes
393 *
394 * Partial pages will be considered reserved and left as they are.
395 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700396 * The range must reside completely on the specified node.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700397 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700398void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
399 unsigned long size)
400{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700401 unsigned long start, end;
402
Catalin Marinasec3a3542009-07-07 10:33:01 +0100403 kmemleak_free_part(__va(physaddr), size);
404
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700405 start = PFN_UP(physaddr);
406 end = PFN_DOWN(physaddr + size);
407
408 mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700409}
410
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700411/**
412 * free_bootmem - mark a page range as usable
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800413 * @addr: starting physical address of the range
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700414 * @size: size of the range in bytes
415 *
416 * Partial pages will be considered reserved and left as they are.
417 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700418 * The range must be contiguous but may span node boundaries.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700419 */
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800420void __init free_bootmem(unsigned long physaddr, unsigned long size)
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700421{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700422 unsigned long start, end;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700423
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800424 kmemleak_free_part(__va(physaddr), size);
Catalin Marinasec3a3542009-07-07 10:33:01 +0100425
Joonsoo Kim81df9bf2012-12-11 16:03:10 -0800426 start = PFN_UP(physaddr);
427 end = PFN_DOWN(physaddr + size);
Yinghai Lua5645a62008-03-18 12:49:12 -0700428
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700429 mark_bootmem(start, end, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430}
431
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700432/**
433 * reserve_bootmem_node - mark a page range as reserved
434 * @pgdat: node the range resides on
435 * @physaddr: starting address of the range
436 * @size: size of the range in bytes
437 * @flags: reservation flags (see linux/bootmem.h)
438 *
439 * Partial pages will be reserved.
440 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700441 * The range must reside completely on the specified node.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700442 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700443int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
444 unsigned long size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700446 unsigned long start, end;
Franck Bui-Huubbc7b922006-09-25 23:31:07 -0700447
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700448 start = PFN_DOWN(physaddr);
449 end = PFN_UP(physaddr + size);
450
451 return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
453
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700454/**
Javi Merino0d4ba4d2012-08-24 18:09:31 +0100455 * reserve_bootmem - mark a page range as reserved
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700456 * @addr: starting address of the range
457 * @size: size of the range in bytes
458 * @flags: reservation flags (see linux/bootmem.h)
459 *
460 * Partial pages will be reserved.
461 *
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700462 * The range must be contiguous but may span node boundaries.
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700463 */
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700464int __init reserve_bootmem(unsigned long addr, unsigned long size,
465 int flags)
466{
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700467 unsigned long start, end;
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700468
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700469 start = PFN_DOWN(addr);
470 end = PFN_UP(addr + size);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700471
Johannes Weinere2bf3ca2008-07-23 21:28:06 -0700472 return mark_bootmem(start, end, 1, flags);
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700473}
Johannes Weiner223e8dc2008-07-23 21:28:00 -0700474
Jan Beulich8aa043d2009-12-14 17:59:46 -0800475static unsigned long __init align_idx(struct bootmem_data *bdata,
476 unsigned long idx, unsigned long step)
Johannes Weiner481ebd02008-08-20 14:09:15 -0700477{
478 unsigned long base = bdata->node_min_pfn;
479
480 /*
481 * Align the index with respect to the node start so that the
482 * combination of both satisfies the requested alignment.
483 */
484
485 return ALIGN(base + idx, step) - base;
486}
487
Jan Beulich8aa043d2009-12-14 17:59:46 -0800488static unsigned long __init align_off(struct bootmem_data *bdata,
489 unsigned long off, unsigned long align)
Johannes Weiner481ebd02008-08-20 14:09:15 -0700490{
491 unsigned long base = PFN_PHYS(bdata->node_min_pfn);
492
493 /* Same as align_idx for byte offsets */
494
495 return ALIGN(base + off, align) - base;
496}
497
Johannes Weinerc6785b62012-05-29 15:06:33 -0700498static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
Tejun Heod0c4f572009-03-01 16:06:56 +0900499 unsigned long size, unsigned long align,
500 unsigned long goal, unsigned long limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501{
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700502 unsigned long fallback = 0;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700503 unsigned long min, max, start, sidx, midx, step;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
Johannes Weiner594fe1a2009-01-06 14:40:32 -0800505 bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
506 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
507 align, goal, limit);
508
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700509 BUG_ON(!size);
510 BUG_ON(align & (align - 1));
511 BUG_ON(limit && goal + size > limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
Christian Krafft7c309a62006-12-06 20:32:41 -0800513 if (!bdata->node_bootmem_map)
514 return NULL;
515
Johannes Weiner3560e242008-07-23 21:28:09 -0700516 min = bdata->node_min_pfn;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700517 max = bdata->node_low_pfn;
Yinghai Lu9a2dc042008-03-18 12:44:48 -0700518
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700519 goal >>= PAGE_SHIFT;
520 limit >>= PAGE_SHIFT;
521
522 if (limit && max > limit)
523 max = limit;
524 if (max <= min)
Yinghai Lu9a2dc042008-03-18 12:44:48 -0700525 return NULL;
526
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700527 step = max(align >> PAGE_SHIFT, 1UL);
Yasunori Goto281dd252005-10-19 15:52:18 -0700528
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700529 if (goal && min < goal && goal < max)
530 start = ALIGN(goal, step);
531 else
532 start = ALIGN(min, step);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Johannes Weiner481ebd02008-08-20 14:09:15 -0700534 sidx = start - bdata->node_min_pfn;
Johannes Weiner3560e242008-07-23 21:28:09 -0700535 midx = max - bdata->node_min_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700537 if (bdata->hint_idx > sidx) {
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700538 /*
539 * Handle the valid case of sidx being zero and still
540 * catch the fallback below.
541 */
542 fallback = sidx + 1;
Johannes Weiner481ebd02008-08-20 14:09:15 -0700543 sidx = align_idx(bdata, bdata->hint_idx, step);
Yinghai Luad093152008-03-10 23:23:42 -0700544 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700546 while (1) {
547 int merge;
548 void *region;
549 unsigned long eidx, i, start_off, end_off;
550find_block:
551 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
Johannes Weiner481ebd02008-08-20 14:09:15 -0700552 sidx = align_idx(bdata, sidx, step);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700553 eidx = sidx + PFN_UP(size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700555 if (sidx >= midx || eidx > midx)
Haren Myneni66d43e92005-12-12 00:37:39 -0800556 break;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700557
558 for (i = sidx; i < eidx; i++)
559 if (test_bit(i, bdata->node_bootmem_map)) {
Johannes Weiner481ebd02008-08-20 14:09:15 -0700560 sidx = align_idx(bdata, i, step);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700561 if (sidx == i)
562 sidx += step;
563 goto find_block;
564 }
565
Mikulas Patocka627240a2008-08-15 00:40:17 -0700566 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700567 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
Johannes Weiner481ebd02008-08-20 14:09:15 -0700568 start_off = align_off(bdata, bdata->last_end_off, align);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700569 else
570 start_off = PFN_PHYS(sidx);
571
572 merge = PFN_DOWN(start_off) < sidx;
573 end_off = start_off + size;
574
575 bdata->last_end_off = end_off;
576 bdata->hint_idx = PFN_UP(end_off);
577
578 /*
579 * Reserve the area now:
580 */
Johannes Weinerd747fa42008-07-23 21:28:05 -0700581 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
582 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
583 BUG();
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700584
Johannes Weiner3560e242008-07-23 21:28:09 -0700585 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
586 start_off);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700587 memset(region, 0, size);
Catalin Marinas008139d2009-08-27 14:29:17 +0100588 /*
589 * The min_count is set to 0 so that bootmem allocated blocks
590 * are never reported as leaks.
591 */
592 kmemleak_alloc(region, size, 0, 0);
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700593 return region;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 }
595
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700596 if (fallback) {
Johannes Weiner481ebd02008-08-20 14:09:15 -0700597 sidx = align_idx(bdata, fallback - 1, step);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700598 fallback = 0;
599 goto find_block;
600 }
601
602 return NULL;
603}
604
Johannes Weinerc12ab502012-05-29 15:06:33 -0700605static void * __init alloc_bootmem_core(unsigned long size,
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700606 unsigned long align,
607 unsigned long goal,
608 unsigned long limit)
609{
610 bootmem_data_t *bdata;
Tejun Heod0c4f572009-03-01 16:06:56 +0900611 void *region;
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700612
Joonsoo Kim3f7dfe22012-12-12 13:50:43 -0800613 if (WARN_ON_ONCE(slab_is_available()))
614 return kzalloc(size, GFP_NOWAIT);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700615
Tejun Heod0c4f572009-03-01 16:06:56 +0900616 list_for_each_entry(bdata, &bdata_list, list) {
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700617 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
618 continue;
Johannes Weiner3560e242008-07-23 21:28:09 -0700619 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700620 break;
621
Johannes Weinerc6785b62012-05-29 15:06:33 -0700622 region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700623 if (region)
624 return region;
625 }
626
Johannes Weinerc12ab502012-05-29 15:06:33 -0700627 return NULL;
628}
629
630static void * __init ___alloc_bootmem_nopanic(unsigned long size,
631 unsigned long align,
632 unsigned long goal,
633 unsigned long limit)
634{
635 void *ptr;
636
637restart:
638 ptr = alloc_bootmem_core(size, align, goal, limit);
639 if (ptr)
640 return ptr;
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700641 if (goal) {
642 goal = 0;
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700643 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 }
Johannes Weiner5f2809e2008-07-23 21:28:05 -0700645
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647}
648
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700649/**
650 * __alloc_bootmem_nopanic - allocate boot memory without panicking
651 * @size: size of the request in bytes
652 * @align: alignment of the region
653 * @goal: preferred starting address of the region
654 *
655 * The goal is dropped if it can not be satisfied and the allocation will
656 * fall back to memory below @goal.
657 *
658 * Allocation may happen on any node in the system.
659 *
660 * Returns NULL on failure.
661 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700662void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700663 unsigned long goal)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664{
Yinghai Lu08677212010-02-10 01:20:20 -0800665 unsigned long limit = 0;
666
Yinghai Lu08677212010-02-10 01:20:20 -0800667 return ___alloc_bootmem_nopanic(size, align, goal, limit);
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700668}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700670static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
671 unsigned long goal, unsigned long limit)
672{
673 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
674
675 if (mem)
676 return mem;
677 /*
678 * Whoops, we cannot satisfy the allocation request.
679 */
680 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
681 panic("Out of memory");
Andi Kleena8062232006-04-07 19:49:21 +0200682 return NULL;
683}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700685/**
686 * __alloc_bootmem - allocate boot memory
687 * @size: size of the request in bytes
688 * @align: alignment of the region
689 * @goal: preferred starting address of the region
690 *
691 * The goal is dropped if it can not be satisfied and the allocation will
692 * fall back to memory below @goal.
693 *
694 * Allocation may happen on any node in the system.
695 *
696 * The function panics if the request can not be satisfied.
697 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700698void * __init __alloc_bootmem(unsigned long size, unsigned long align,
699 unsigned long goal)
Andi Kleena8062232006-04-07 19:49:21 +0200700{
Yinghai Lu08677212010-02-10 01:20:20 -0800701 unsigned long limit = 0;
702
Yinghai Lu08677212010-02-10 01:20:20 -0800703 return ___alloc_bootmem(size, align, goal, limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704}
705
Yinghai Lu99ab7b12012-07-11 14:02:53 -0700706void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
Johannes Weiner4cc278b2008-07-23 21:28:08 -0700707 unsigned long size, unsigned long align,
708 unsigned long goal, unsigned long limit)
709{
710 void *ptr;
711
Joonsoo Kim3f7dfe22012-12-12 13:50:43 -0800712 if (WARN_ON_ONCE(slab_is_available()))
713 return kzalloc(size, GFP_NOWAIT);
Johannes Weinerab381842012-05-29 15:06:34 -0700714again:
Tejun Heod0c4f572009-03-01 16:06:56 +0900715
Yinghai Luc8f4a2d2012-07-17 15:47:51 -0700716 /* do not panic in alloc_bootmem_bdata() */
717 if (limit && goal + size > limit)
718 limit = 0;
719
Johannes Weinere9079912012-05-29 15:06:36 -0700720 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
Johannes Weiner4cc278b2008-07-23 21:28:08 -0700721 if (ptr)
722 return ptr;
723
Johannes Weinerab381842012-05-29 15:06:34 -0700724 ptr = alloc_bootmem_core(size, align, goal, limit);
725 if (ptr)
726 return ptr;
727
728 if (goal) {
729 goal = 0;
730 goto again;
731 }
732
Johannes Weiner421456e2012-05-29 15:06:34 -0700733 return NULL;
734}
735
736void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
737 unsigned long align, unsigned long goal)
738{
739 if (WARN_ON_ONCE(slab_is_available()))
740 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
741
Johannes Weinere9079912012-05-29 15:06:36 -0700742 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
Johannes Weiner421456e2012-05-29 15:06:34 -0700743}
744
Johannes Weinere9079912012-05-29 15:06:36 -0700745void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
Johannes Weiner421456e2012-05-29 15:06:34 -0700746 unsigned long align, unsigned long goal,
747 unsigned long limit)
748{
749 void *ptr;
750
Johannes Weinere9079912012-05-29 15:06:36 -0700751 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
Johannes Weiner421456e2012-05-29 15:06:34 -0700752 if (ptr)
753 return ptr;
754
Johannes Weinerab381842012-05-29 15:06:34 -0700755 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
756 panic("Out of memory");
757 return NULL;
Johannes Weiner4cc278b2008-07-23 21:28:08 -0700758}
759
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700760/**
761 * __alloc_bootmem_node - allocate boot memory from a specific node
762 * @pgdat: node to allocate from
763 * @size: size of the request in bytes
764 * @align: alignment of the region
765 * @goal: preferred starting address of the region
766 *
767 * The goal is dropped if it can not be satisfied and the allocation will
768 * fall back to memory below @goal.
769 *
770 * Allocation may fall back to any node in the system if the specified node
771 * can not hold the requested memory.
772 *
773 * The function panics if the request can not be satisfied.
774 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700775void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
776 unsigned long align, unsigned long goal)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777{
Pekka Enbergc91c4772009-06-11 08:10:28 +0300778 if (WARN_ON_ONCE(slab_is_available()))
779 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
780
Johannes Weinere9079912012-05-29 15:06:36 -0700781 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
Yinghai Lu08677212010-02-10 01:20:20 -0800782}
783
784void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
785 unsigned long align, unsigned long goal)
786{
787#ifdef MAX_DMA32_PFN
788 unsigned long end_pfn;
789
790 if (WARN_ON_ONCE(slab_is_available()))
791 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
792
793 /* update goal according ...MAX_DMA32_PFN */
794 end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
795
796 if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
797 (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
798 void *ptr;
799 unsigned long new_goal;
800
801 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
Johannes Weinerc6785b62012-05-29 15:06:33 -0700802 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
Yinghai Lu08677212010-02-10 01:20:20 -0800803 new_goal, 0);
Yinghai Lu08677212010-02-10 01:20:20 -0800804 if (ptr)
805 return ptr;
806 }
807#endif
808
809 return __alloc_bootmem_node(pgdat, size, align, goal);
810
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811}
812
Heiko Carstensdfd54cb2006-09-25 23:31:33 -0700813#ifndef ARCH_LOW_ADDRESS_LIMIT
814#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
815#endif
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800816
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700817/**
818 * __alloc_bootmem_low - allocate low boot memory
819 * @size: size of the request in bytes
820 * @align: alignment of the region
821 * @goal: preferred starting address of the region
822 *
823 * The goal is dropped if it can not be satisfied and the allocation will
824 * fall back to memory below @goal.
825 *
826 * Allocation may happen on any node in the system.
827 *
828 * The function panics if the request can not be satisfied.
829 */
Franck Bui-Huubb0923a2006-09-25 23:31:05 -0700830void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
831 unsigned long goal)
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800832{
Johannes Weiner0f3caba2008-07-23 21:28:07 -0700833 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800834}
835
Yinghai Lu38fa4172013-01-24 12:20:15 -0800836void * __init __alloc_bootmem_low_nopanic(unsigned long size,
837 unsigned long align,
838 unsigned long goal)
839{
840 return ___alloc_bootmem_nopanic(size, align, goal,
841 ARCH_LOW_ADDRESS_LIMIT);
842}
843
Johannes Weinera66fd7d2008-07-23 21:28:01 -0700844/**
845 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
846 * @pgdat: node to allocate from
847 * @size: size of the request in bytes
848 * @align: alignment of the region
849 * @goal: preferred starting address of the region
850 *
851 * The goal is dropped if it can not be satisfied and the allocation will
852 * fall back to memory below @goal.
853 *
854 * Allocation may fall back to any node in the system if the specified node
855 * can not hold the requested memory.
856 *
857 * The function panics if the request can not be satisfied.
858 */
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800859void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
860 unsigned long align, unsigned long goal)
861{
Pekka Enbergc91c4772009-06-11 08:10:28 +0300862 if (WARN_ON_ONCE(slab_is_available()))
863 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
864
Johannes Weinere9079912012-05-29 15:06:36 -0700865 return ___alloc_bootmem_node(pgdat, size, align,
866 goal, ARCH_LOW_ADDRESS_LIMIT);
Ravikiran G Thirumalai008857c2006-01-06 00:11:01 -0800867}