mmc: sdhci: fix command response CRC error handling
[linux-2.6/btrfs-unstable.git] / mm / bootmem.c
blob91e32bc8517ffe458f667a19a346ebd16ff2d0aa
1 /*
2 * bootmem - A boot-time physical memory allocator and configurator
4 * Copyright (C) 1999 Ingo Molnar
5 * 1999 Kanoj Sarcar, SGI
6 * 2008 Johannes Weiner
8 * Access to this subsystem has to be serialized externally (which is true
9 * for the boot process anyway).
11 #include <linux/init.h>
12 #include <linux/pfn.h>
13 #include <linux/slab.h>
14 #include <linux/bootmem.h>
15 #include <linux/export.h>
16 #include <linux/kmemleak.h>
17 #include <linux/range.h>
18 #include <linux/memblock.h>
19 #include <linux/bug.h>
20 #include <linux/io.h>
22 #include <asm/processor.h>
24 #include "internal.h"
26 #ifndef CONFIG_NEED_MULTIPLE_NODES
27 struct pglist_data __refdata contig_page_data = {
28 .bdata = &bootmem_node_data[0]
30 EXPORT_SYMBOL(contig_page_data);
31 #endif
33 unsigned long max_low_pfn;
34 unsigned long min_low_pfn;
35 unsigned long max_pfn;
36 unsigned long long max_possible_pfn;
38 bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
40 static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
42 static int bootmem_debug;
44 static int __init bootmem_debug_setup(char *buf)
46 bootmem_debug = 1;
47 return 0;
49 early_param("bootmem_debug", bootmem_debug_setup);
51 #define bdebug(fmt, args...) ({ \
52 if (unlikely(bootmem_debug)) \
53 printk(KERN_INFO \
54 "bootmem::%s " fmt, \
55 __func__, ## args); \
58 static unsigned long __init bootmap_bytes(unsigned long pages)
60 unsigned long bytes = DIV_ROUND_UP(pages, 8);
62 return ALIGN(bytes, sizeof(long));
65 /**
66 * bootmem_bootmap_pages - calculate bitmap size in pages
67 * @pages: number of pages the bitmap has to represent
69 unsigned long __init bootmem_bootmap_pages(unsigned long pages)
71 unsigned long bytes = bootmap_bytes(pages);
73 return PAGE_ALIGN(bytes) >> PAGE_SHIFT;
77 * link bdata in order
79 static void __init link_bootmem(bootmem_data_t *bdata)
81 bootmem_data_t *ent;
83 list_for_each_entry(ent, &bdata_list, list) {
84 if (bdata->node_min_pfn < ent->node_min_pfn) {
85 list_add_tail(&bdata->list, &ent->list);
86 return;
90 list_add_tail(&bdata->list, &bdata_list);
94 * Called once to set up the allocator itself.
96 static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
97 unsigned long mapstart, unsigned long start, unsigned long end)
99 unsigned long mapsize;
101 mminit_validate_memmodel_limits(&start, &end);
102 bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
103 bdata->node_min_pfn = start;
104 bdata->node_low_pfn = end;
105 link_bootmem(bdata);
108 * Initially all pages are reserved - setup_arch() has to
109 * register free RAM areas explicitly.
111 mapsize = bootmap_bytes(end - start);
112 memset(bdata->node_bootmem_map, 0xff, mapsize);
114 bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
115 bdata - bootmem_node_data, start, mapstart, end, mapsize);
117 return mapsize;
121 * init_bootmem_node - register a node as boot memory
122 * @pgdat: node to register
123 * @freepfn: pfn where the bitmap for this node is to be placed
124 * @startpfn: first pfn on the node
125 * @endpfn: first pfn after the node
127 * Returns the number of bytes needed to hold the bitmap for this node.
129 unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
130 unsigned long startpfn, unsigned long endpfn)
132 return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn);
136 * init_bootmem - register boot memory
137 * @start: pfn where the bitmap is to be placed
138 * @pages: number of available physical pages
140 * Returns the number of bytes needed to hold the bitmap.
142 unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
144 max_low_pfn = pages;
145 min_low_pfn = start;
146 return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages);
150 * free_bootmem_late - free bootmem pages directly to page allocator
151 * @addr: starting physical address of the range
152 * @size: size of the range in bytes
154 * This is only useful when the bootmem allocator has already been torn
155 * down, but we are still initializing the system. Pages are given directly
156 * to the page allocator, no bootmem metadata is updated because it is gone.
158 void __init free_bootmem_late(unsigned long physaddr, unsigned long size)
160 unsigned long cursor, end;
162 kmemleak_free_part(__va(physaddr), size);
164 cursor = PFN_UP(physaddr);
165 end = PFN_DOWN(physaddr + size);
167 for (; cursor < end; cursor++) {
168 __free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
169 totalram_pages++;
173 static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
175 struct page *page;
176 unsigned long *map, start, end, pages, cur, count = 0;
178 if (!bdata->node_bootmem_map)
179 return 0;
181 map = bdata->node_bootmem_map;
182 start = bdata->node_min_pfn;
183 end = bdata->node_low_pfn;
185 bdebug("nid=%td start=%lx end=%lx\n",
186 bdata - bootmem_node_data, start, end);
188 while (start < end) {
189 unsigned long idx, vec;
190 unsigned shift;
192 idx = start - bdata->node_min_pfn;
193 shift = idx & (BITS_PER_LONG - 1);
195 * vec holds at most BITS_PER_LONG map bits,
196 * bit 0 corresponds to start.
198 vec = ~map[idx / BITS_PER_LONG];
200 if (shift) {
201 vec >>= shift;
202 if (end - start >= BITS_PER_LONG)
203 vec |= ~map[idx / BITS_PER_LONG + 1] <<
204 (BITS_PER_LONG - shift);
207 * If we have a properly aligned and fully unreserved
208 * BITS_PER_LONG block of pages in front of us, free
209 * it in one go.
211 if (IS_ALIGNED(start, BITS_PER_LONG) && vec == ~0UL) {
212 int order = ilog2(BITS_PER_LONG);
214 __free_pages_bootmem(pfn_to_page(start), start, order);
215 count += BITS_PER_LONG;
216 start += BITS_PER_LONG;
217 } else {
218 cur = start;
220 start = ALIGN(start + 1, BITS_PER_LONG);
221 while (vec && cur != start) {
222 if (vec & 1) {
223 page = pfn_to_page(cur);
224 __free_pages_bootmem(page, cur, 0);
225 count++;
227 vec >>= 1;
228 ++cur;
233 cur = bdata->node_min_pfn;
234 page = virt_to_page(bdata->node_bootmem_map);
235 pages = bdata->node_low_pfn - bdata->node_min_pfn;
236 pages = bootmem_bootmap_pages(pages);
237 count += pages;
238 while (pages--)
239 __free_pages_bootmem(page++, cur++, 0);
240 bdata->node_bootmem_map = NULL;
242 bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
244 return count;
247 static int reset_managed_pages_done __initdata;
249 void reset_node_managed_pages(pg_data_t *pgdat)
251 struct zone *z;
253 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
254 z->managed_pages = 0;
257 void __init reset_all_zones_managed_pages(void)
259 struct pglist_data *pgdat;
261 if (reset_managed_pages_done)
262 return;
264 for_each_online_pgdat(pgdat)
265 reset_node_managed_pages(pgdat);
267 reset_managed_pages_done = 1;
271 * free_all_bootmem - release free pages to the buddy allocator
273 * Returns the number of pages actually released.
275 unsigned long __init free_all_bootmem(void)
277 unsigned long total_pages = 0;
278 bootmem_data_t *bdata;
280 reset_all_zones_managed_pages();
282 list_for_each_entry(bdata, &bdata_list, list)
283 total_pages += free_all_bootmem_core(bdata);
285 totalram_pages += total_pages;
287 return total_pages;
290 static void __init __free(bootmem_data_t *bdata,
291 unsigned long sidx, unsigned long eidx)
293 unsigned long idx;
295 bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
296 sidx + bdata->node_min_pfn,
297 eidx + bdata->node_min_pfn);
299 if (WARN_ON(bdata->node_bootmem_map == NULL))
300 return;
302 if (bdata->hint_idx > sidx)
303 bdata->hint_idx = sidx;
305 for (idx = sidx; idx < eidx; idx++)
306 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
307 BUG();
310 static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
311 unsigned long eidx, int flags)
313 unsigned long idx;
314 int exclusive = flags & BOOTMEM_EXCLUSIVE;
316 bdebug("nid=%td start=%lx end=%lx flags=%x\n",
317 bdata - bootmem_node_data,
318 sidx + bdata->node_min_pfn,
319 eidx + bdata->node_min_pfn,
320 flags);
322 if (WARN_ON(bdata->node_bootmem_map == NULL))
323 return 0;
325 for (idx = sidx; idx < eidx; idx++)
326 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
327 if (exclusive) {
328 __free(bdata, sidx, idx);
329 return -EBUSY;
331 bdebug("silent double reserve of PFN %lx\n",
332 idx + bdata->node_min_pfn);
334 return 0;
337 static int __init mark_bootmem_node(bootmem_data_t *bdata,
338 unsigned long start, unsigned long end,
339 int reserve, int flags)
341 unsigned long sidx, eidx;
343 bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
344 bdata - bootmem_node_data, start, end, reserve, flags);
346 BUG_ON(start < bdata->node_min_pfn);
347 BUG_ON(end > bdata->node_low_pfn);
349 sidx = start - bdata->node_min_pfn;
350 eidx = end - bdata->node_min_pfn;
352 if (reserve)
353 return __reserve(bdata, sidx, eidx, flags);
354 else
355 __free(bdata, sidx, eidx);
356 return 0;
359 static int __init mark_bootmem(unsigned long start, unsigned long end,
360 int reserve, int flags)
362 unsigned long pos;
363 bootmem_data_t *bdata;
365 pos = start;
366 list_for_each_entry(bdata, &bdata_list, list) {
367 int err;
368 unsigned long max;
370 if (pos < bdata->node_min_pfn ||
371 pos >= bdata->node_low_pfn) {
372 BUG_ON(pos != start);
373 continue;
376 max = min(bdata->node_low_pfn, end);
378 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
379 if (reserve && err) {
380 mark_bootmem(start, pos, 0, 0);
381 return err;
384 if (max == end)
385 return 0;
386 pos = bdata->node_low_pfn;
388 BUG();
392 * free_bootmem_node - mark a page range as usable
393 * @pgdat: node the range resides on
394 * @physaddr: starting address of the range
395 * @size: size of the range in bytes
397 * Partial pages will be considered reserved and left as they are.
399 * The range must reside completely on the specified node.
401 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
402 unsigned long size)
404 unsigned long start, end;
406 kmemleak_free_part(__va(physaddr), size);
408 start = PFN_UP(physaddr);
409 end = PFN_DOWN(physaddr + size);
411 mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
415 * free_bootmem - mark a page range as usable
416 * @addr: starting physical address of the range
417 * @size: size of the range in bytes
419 * Partial pages will be considered reserved and left as they are.
421 * The range must be contiguous but may span node boundaries.
423 void __init free_bootmem(unsigned long physaddr, unsigned long size)
425 unsigned long start, end;
427 kmemleak_free_part(__va(physaddr), size);
429 start = PFN_UP(physaddr);
430 end = PFN_DOWN(physaddr + size);
432 mark_bootmem(start, end, 0, 0);
436 * reserve_bootmem_node - mark a page range as reserved
437 * @pgdat: node the range resides on
438 * @physaddr: starting address of the range
439 * @size: size of the range in bytes
440 * @flags: reservation flags (see linux/bootmem.h)
442 * Partial pages will be reserved.
444 * The range must reside completely on the specified node.
446 int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
447 unsigned long size, int flags)
449 unsigned long start, end;
451 start = PFN_DOWN(physaddr);
452 end = PFN_UP(physaddr + size);
454 return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
458 * reserve_bootmem - mark a page range as reserved
459 * @addr: starting address of the range
460 * @size: size of the range in bytes
461 * @flags: reservation flags (see linux/bootmem.h)
463 * Partial pages will be reserved.
465 * The range must be contiguous but may span node boundaries.
467 int __init reserve_bootmem(unsigned long addr, unsigned long size,
468 int flags)
470 unsigned long start, end;
472 start = PFN_DOWN(addr);
473 end = PFN_UP(addr + size);
475 return mark_bootmem(start, end, 1, flags);
478 static unsigned long __init align_idx(struct bootmem_data *bdata,
479 unsigned long idx, unsigned long step)
481 unsigned long base = bdata->node_min_pfn;
484 * Align the index with respect to the node start so that the
485 * combination of both satisfies the requested alignment.
488 return ALIGN(base + idx, step) - base;
491 static unsigned long __init align_off(struct bootmem_data *bdata,
492 unsigned long off, unsigned long align)
494 unsigned long base = PFN_PHYS(bdata->node_min_pfn);
496 /* Same as align_idx for byte offsets */
498 return ALIGN(base + off, align) - base;
501 static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
502 unsigned long size, unsigned long align,
503 unsigned long goal, unsigned long limit)
505 unsigned long fallback = 0;
506 unsigned long min, max, start, sidx, midx, step;
508 bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
509 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
510 align, goal, limit);
512 BUG_ON(!size);
513 BUG_ON(align & (align - 1));
514 BUG_ON(limit && goal + size > limit);
516 if (!bdata->node_bootmem_map)
517 return NULL;
519 min = bdata->node_min_pfn;
520 max = bdata->node_low_pfn;
522 goal >>= PAGE_SHIFT;
523 limit >>= PAGE_SHIFT;
525 if (limit && max > limit)
526 max = limit;
527 if (max <= min)
528 return NULL;
530 step = max(align >> PAGE_SHIFT, 1UL);
532 if (goal && min < goal && goal < max)
533 start = ALIGN(goal, step);
534 else
535 start = ALIGN(min, step);
537 sidx = start - bdata->node_min_pfn;
538 midx = max - bdata->node_min_pfn;
540 if (bdata->hint_idx > sidx) {
542 * Handle the valid case of sidx being zero and still
543 * catch the fallback below.
545 fallback = sidx + 1;
546 sidx = align_idx(bdata, bdata->hint_idx, step);
549 while (1) {
550 int merge;
551 void *region;
552 unsigned long eidx, i, start_off, end_off;
553 find_block:
554 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
555 sidx = align_idx(bdata, sidx, step);
556 eidx = sidx + PFN_UP(size);
558 if (sidx >= midx || eidx > midx)
559 break;
561 for (i = sidx; i < eidx; i++)
562 if (test_bit(i, bdata->node_bootmem_map)) {
563 sidx = align_idx(bdata, i, step);
564 if (sidx == i)
565 sidx += step;
566 goto find_block;
569 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
570 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
571 start_off = align_off(bdata, bdata->last_end_off, align);
572 else
573 start_off = PFN_PHYS(sidx);
575 merge = PFN_DOWN(start_off) < sidx;
576 end_off = start_off + size;
578 bdata->last_end_off = end_off;
579 bdata->hint_idx = PFN_UP(end_off);
582 * Reserve the area now:
584 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
585 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
586 BUG();
588 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
589 start_off);
590 memset(region, 0, size);
592 * The min_count is set to 0 so that bootmem allocated blocks
593 * are never reported as leaks.
595 kmemleak_alloc(region, size, 0, 0);
596 return region;
599 if (fallback) {
600 sidx = align_idx(bdata, fallback - 1, step);
601 fallback = 0;
602 goto find_block;
605 return NULL;
608 static void * __init alloc_bootmem_core(unsigned long size,
609 unsigned long align,
610 unsigned long goal,
611 unsigned long limit)
613 bootmem_data_t *bdata;
614 void *region;
616 if (WARN_ON_ONCE(slab_is_available()))
617 return kzalloc(size, GFP_NOWAIT);
619 list_for_each_entry(bdata, &bdata_list, list) {
620 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
621 continue;
622 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
623 break;
625 region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
626 if (region)
627 return region;
630 return NULL;
633 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
634 unsigned long align,
635 unsigned long goal,
636 unsigned long limit)
638 void *ptr;
640 restart:
641 ptr = alloc_bootmem_core(size, align, goal, limit);
642 if (ptr)
643 return ptr;
644 if (goal) {
645 goal = 0;
646 goto restart;
649 return NULL;
653 * __alloc_bootmem_nopanic - allocate boot memory without panicking
654 * @size: size of the request in bytes
655 * @align: alignment of the region
656 * @goal: preferred starting address of the region
658 * The goal is dropped if it can not be satisfied and the allocation will
659 * fall back to memory below @goal.
661 * Allocation may happen on any node in the system.
663 * Returns NULL on failure.
665 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
666 unsigned long goal)
668 unsigned long limit = 0;
670 return ___alloc_bootmem_nopanic(size, align, goal, limit);
673 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
674 unsigned long goal, unsigned long limit)
676 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
678 if (mem)
679 return mem;
681 * Whoops, we cannot satisfy the allocation request.
683 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
684 panic("Out of memory");
685 return NULL;
689 * __alloc_bootmem - allocate boot memory
690 * @size: size of the request in bytes
691 * @align: alignment of the region
692 * @goal: preferred starting address of the region
694 * The goal is dropped if it can not be satisfied and the allocation will
695 * fall back to memory below @goal.
697 * Allocation may happen on any node in the system.
699 * The function panics if the request can not be satisfied.
701 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
702 unsigned long goal)
704 unsigned long limit = 0;
706 return ___alloc_bootmem(size, align, goal, limit);
709 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
710 unsigned long size, unsigned long align,
711 unsigned long goal, unsigned long limit)
713 void *ptr;
715 if (WARN_ON_ONCE(slab_is_available()))
716 return kzalloc(size, GFP_NOWAIT);
717 again:
719 /* do not panic in alloc_bootmem_bdata() */
720 if (limit && goal + size > limit)
721 limit = 0;
723 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
724 if (ptr)
725 return ptr;
727 ptr = alloc_bootmem_core(size, align, goal, limit);
728 if (ptr)
729 return ptr;
731 if (goal) {
732 goal = 0;
733 goto again;
736 return NULL;
739 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
740 unsigned long align, unsigned long goal)
742 if (WARN_ON_ONCE(slab_is_available()))
743 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
745 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
748 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
749 unsigned long align, unsigned long goal,
750 unsigned long limit)
752 void *ptr;
754 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
755 if (ptr)
756 return ptr;
758 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
759 panic("Out of memory");
760 return NULL;
764 * __alloc_bootmem_node - allocate boot memory from a specific node
765 * @pgdat: node to allocate from
766 * @size: size of the request in bytes
767 * @align: alignment of the region
768 * @goal: preferred starting address of the region
770 * The goal is dropped if it can not be satisfied and the allocation will
771 * fall back to memory below @goal.
773 * Allocation may fall back to any node in the system if the specified node
774 * can not hold the requested memory.
776 * The function panics if the request can not be satisfied.
778 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
779 unsigned long align, unsigned long goal)
781 if (WARN_ON_ONCE(slab_is_available()))
782 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
784 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
787 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
788 unsigned long align, unsigned long goal)
790 #ifdef MAX_DMA32_PFN
791 unsigned long end_pfn;
793 if (WARN_ON_ONCE(slab_is_available()))
794 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
796 /* update goal according ...MAX_DMA32_PFN */
797 end_pfn = pgdat_end_pfn(pgdat);
799 if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
800 (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
801 void *ptr;
802 unsigned long new_goal;
804 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
805 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
806 new_goal, 0);
807 if (ptr)
808 return ptr;
810 #endif
812 return __alloc_bootmem_node(pgdat, size, align, goal);
816 #ifndef ARCH_LOW_ADDRESS_LIMIT
817 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
818 #endif
821 * __alloc_bootmem_low - allocate low boot memory
822 * @size: size of the request in bytes
823 * @align: alignment of the region
824 * @goal: preferred starting address of the region
826 * The goal is dropped if it can not be satisfied and the allocation will
827 * fall back to memory below @goal.
829 * Allocation may happen on any node in the system.
831 * The function panics if the request can not be satisfied.
833 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
834 unsigned long goal)
836 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
839 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
840 unsigned long align,
841 unsigned long goal)
843 return ___alloc_bootmem_nopanic(size, align, goal,
844 ARCH_LOW_ADDRESS_LIMIT);
848 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
849 * @pgdat: node to allocate from
850 * @size: size of the request in bytes
851 * @align: alignment of the region
852 * @goal: preferred starting address of the region
854 * The goal is dropped if it can not be satisfied and the allocation will
855 * fall back to memory below @goal.
857 * Allocation may fall back to any node in the system if the specified node
858 * can not hold the requested memory.
860 * The function panics if the request can not be satisfied.
862 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
863 unsigned long align, unsigned long goal)
865 if (WARN_ON_ONCE(slab_is_available()))
866 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
868 return ___alloc_bootmem_node(pgdat, size, align,
869 goal, ARCH_LOW_ADDRESS_LIMIT);