Reincarnate get_mapsize as bootmap_bytes and implement bootmem_bootmap_pages on top of it. Adjust users of these helpers and make free_all_bootmem_core use bootmem_bootmap_pages instead of open-coding it. Signed-off-by: Johannes Weiner <hannes@saeurebad.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
794 lines
20 KiB
C
794 lines
20 KiB
C
/*
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* bootmem - A boot-time physical memory allocator and configurator
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*
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* Copyright (C) 1999 Ingo Molnar
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* 1999 Kanoj Sarcar, SGI
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* 2008 Johannes Weiner
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*
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* Access to this subsystem has to be serialized externally (which is true
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* for the boot process anyway).
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*/
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#include <linux/init.h>
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#include <linux/pfn.h>
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#include <linux/bootmem.h>
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#include <linux/module.h>
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#include <asm/bug.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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#include "internal.h"
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unsigned long max_low_pfn;
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unsigned long min_low_pfn;
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unsigned long max_pfn;
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static LIST_HEAD(bdata_list);
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#ifdef CONFIG_CRASH_DUMP
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/*
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* If we have booted due to a crash, max_pfn will be a very low value. We need
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* to know the amount of memory that the previous kernel used.
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*/
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unsigned long saved_max_pfn;
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#endif
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bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
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static int bootmem_debug;
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static int __init bootmem_debug_setup(char *buf)
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{
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bootmem_debug = 1;
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return 0;
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}
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early_param("bootmem_debug", bootmem_debug_setup);
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#define bdebug(fmt, args...) ({ \
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if (unlikely(bootmem_debug)) \
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printk(KERN_INFO \
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"bootmem::%s " fmt, \
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__FUNCTION__, ## args); \
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})
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static unsigned long __init bootmap_bytes(unsigned long pages)
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{
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unsigned long bytes = (pages + 7) / 8;
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return ALIGN(bytes, sizeof(long));
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}
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/**
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* bootmem_bootmap_pages - calculate bitmap size in pages
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* @pages: number of pages the bitmap has to represent
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*/
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unsigned long __init bootmem_bootmap_pages(unsigned long pages)
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{
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unsigned long bytes = bootmap_bytes(pages);
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return PAGE_ALIGN(bytes) >> PAGE_SHIFT;
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}
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/*
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* link bdata in order
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*/
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static void __init link_bootmem(bootmem_data_t *bdata)
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{
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bootmem_data_t *ent;
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if (list_empty(&bdata_list)) {
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list_add(&bdata->list, &bdata_list);
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return;
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}
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/* insert in order */
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list_for_each_entry(ent, &bdata_list, list) {
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if (bdata->node_boot_start < ent->node_boot_start) {
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list_add_tail(&bdata->list, &ent->list);
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return;
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}
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}
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list_add_tail(&bdata->list, &bdata_list);
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}
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/*
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* Called once to set up the allocator itself.
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*/
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static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
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unsigned long mapstart, unsigned long start, unsigned long end)
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{
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unsigned long mapsize;
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mminit_validate_memmodel_limits(&start, &end);
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bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
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bdata->node_boot_start = PFN_PHYS(start);
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bdata->node_low_pfn = end;
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link_bootmem(bdata);
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/*
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* Initially all pages are reserved - setup_arch() has to
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* register free RAM areas explicitly.
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*/
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mapsize = bootmap_bytes(end - start);
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memset(bdata->node_bootmem_map, 0xff, mapsize);
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bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
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bdata - bootmem_node_data, start, mapstart, end, mapsize);
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return mapsize;
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}
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/**
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* init_bootmem_node - register a node as boot memory
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* @pgdat: node to register
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* @freepfn: pfn where the bitmap for this node is to be placed
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* @startpfn: first pfn on the node
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* @endpfn: first pfn after the node
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*
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* Returns the number of bytes needed to hold the bitmap for this node.
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*/
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unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
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unsigned long startpfn, unsigned long endpfn)
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{
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return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn);
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}
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/**
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* init_bootmem - register boot memory
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* @start: pfn where the bitmap is to be placed
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* @pages: number of available physical pages
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*
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* Returns the number of bytes needed to hold the bitmap.
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*/
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unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
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{
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max_low_pfn = pages;
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min_low_pfn = start;
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return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages);
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}
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static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
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{
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struct page *page;
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unsigned long pfn;
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unsigned long i, count;
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unsigned long idx, pages;
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unsigned long *map;
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int gofast = 0;
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BUG_ON(!bdata->node_bootmem_map);
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count = 0;
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/* first extant page of the node */
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pfn = PFN_DOWN(bdata->node_boot_start);
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idx = bdata->node_low_pfn - pfn;
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map = bdata->node_bootmem_map;
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/*
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* Check if we are aligned to BITS_PER_LONG pages. If so, we might
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* be able to free page orders of that size at once.
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*/
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if (!(pfn & (BITS_PER_LONG-1)))
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gofast = 1;
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for (i = 0; i < idx; ) {
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unsigned long v = ~map[i / BITS_PER_LONG];
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if (gofast && v == ~0UL) {
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int order;
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page = pfn_to_page(pfn);
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count += BITS_PER_LONG;
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order = ffs(BITS_PER_LONG) - 1;
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__free_pages_bootmem(page, order);
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i += BITS_PER_LONG;
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page += BITS_PER_LONG;
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} else if (v) {
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unsigned long m;
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page = pfn_to_page(pfn);
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for (m = 1; m && i < idx; m<<=1, page++, i++) {
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if (v & m) {
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count++;
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__free_pages_bootmem(page, 0);
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}
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}
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} else {
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i += BITS_PER_LONG;
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}
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pfn += BITS_PER_LONG;
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}
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/*
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* Now free the allocator bitmap itself, it's not
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* needed anymore:
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*/
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page = virt_to_page(bdata->node_bootmem_map);
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pages = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start);
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idx = bootmem_bootmap_pages(pages);
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for (i = 0; i < idx; i++, page++)
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__free_pages_bootmem(page, 0);
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count += i;
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bdata->node_bootmem_map = NULL;
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bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
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return count;
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}
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/**
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* free_all_bootmem_node - release a node's free pages to the buddy allocator
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* @pgdat: node to be released
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*
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* Returns the number of pages actually released.
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*/
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unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
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{
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register_page_bootmem_info_node(pgdat);
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return free_all_bootmem_core(pgdat->bdata);
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}
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/**
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* free_all_bootmem - release free pages to the buddy allocator
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*
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* Returns the number of pages actually released.
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*/
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unsigned long __init free_all_bootmem(void)
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{
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return free_all_bootmem_core(NODE_DATA(0)->bdata);
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}
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static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
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unsigned long size)
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{
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unsigned long sidx, eidx;
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unsigned long i;
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BUG_ON(!size);
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/* out range */
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if (addr + size < bdata->node_boot_start ||
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PFN_DOWN(addr) > bdata->node_low_pfn)
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return;
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/*
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* round down end of usable mem, partially free pages are
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* considered reserved.
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*/
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if (addr >= bdata->node_boot_start && addr < bdata->last_success)
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bdata->last_success = addr;
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/*
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* Round up to index to the range.
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*/
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if (PFN_UP(addr) > PFN_DOWN(bdata->node_boot_start))
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sidx = PFN_UP(addr) - PFN_DOWN(bdata->node_boot_start);
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else
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sidx = 0;
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eidx = PFN_DOWN(addr + size - bdata->node_boot_start);
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if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start))
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eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start);
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bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
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sidx + PFN_DOWN(bdata->node_boot_start),
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eidx + PFN_DOWN(bdata->node_boot_start));
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for (i = sidx; i < eidx; i++) {
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if (unlikely(!test_and_clear_bit(i, bdata->node_bootmem_map)))
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BUG();
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}
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}
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/**
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* free_bootmem_node - mark a page range as usable
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* @pgdat: node the range resides on
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* @physaddr: starting address of the range
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* @size: size of the range in bytes
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*
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* Partial pages will be considered reserved and left as they are.
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*
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* Only physical pages that actually reside on @pgdat are marked.
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*/
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void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
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unsigned long size)
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{
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free_bootmem_core(pgdat->bdata, physaddr, size);
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}
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/**
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* free_bootmem - mark a page range as usable
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* @addr: starting address of the range
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* @size: size of the range in bytes
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*
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* Partial pages will be considered reserved and left as they are.
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*
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* All physical pages within the range are marked, no matter what
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* node they reside on.
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*/
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void __init free_bootmem(unsigned long addr, unsigned long size)
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{
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bootmem_data_t *bdata;
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list_for_each_entry(bdata, &bdata_list, list)
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free_bootmem_core(bdata, addr, size);
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}
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/*
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* Marks a particular physical memory range as unallocatable. Usable RAM
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* might be used for boot-time allocations - or it might get added
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* to the free page pool later on.
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*/
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static int __init can_reserve_bootmem_core(bootmem_data_t *bdata,
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unsigned long addr, unsigned long size, int flags)
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{
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unsigned long sidx, eidx;
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unsigned long i;
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BUG_ON(!size);
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/* out of range, don't hold other */
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if (addr + size < bdata->node_boot_start ||
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PFN_DOWN(addr) > bdata->node_low_pfn)
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return 0;
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/*
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* Round up to index to the range.
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*/
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if (addr > bdata->node_boot_start)
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sidx= PFN_DOWN(addr - bdata->node_boot_start);
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else
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sidx = 0;
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eidx = PFN_UP(addr + size - bdata->node_boot_start);
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if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start))
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eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start);
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for (i = sidx; i < eidx; i++) {
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if (test_bit(i, bdata->node_bootmem_map)) {
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if (flags & BOOTMEM_EXCLUSIVE)
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return -EBUSY;
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}
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}
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return 0;
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}
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static void __init reserve_bootmem_core(bootmem_data_t *bdata,
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unsigned long addr, unsigned long size, int flags)
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{
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unsigned long sidx, eidx;
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unsigned long i;
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BUG_ON(!size);
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/* out of range */
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if (addr + size < bdata->node_boot_start ||
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PFN_DOWN(addr) > bdata->node_low_pfn)
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return;
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/*
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* Round up to index to the range.
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*/
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if (addr > bdata->node_boot_start)
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sidx= PFN_DOWN(addr - bdata->node_boot_start);
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else
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sidx = 0;
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eidx = PFN_UP(addr + size - bdata->node_boot_start);
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if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start))
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eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start);
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bdebug("nid=%td start=%lx end=%lx flags=%x\n",
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bdata - bootmem_node_data,
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sidx + PFN_DOWN(bdata->node_boot_start),
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eidx + PFN_DOWN(bdata->node_boot_start),
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flags);
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for (i = sidx; i < eidx; i++)
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if (test_and_set_bit(i, bdata->node_bootmem_map))
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bdebug("hm, page %lx reserved twice.\n",
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PFN_DOWN(bdata->node_boot_start) + i);
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}
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/**
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* reserve_bootmem_node - mark a page range as reserved
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* @pgdat: node the range resides on
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* @physaddr: starting address of the range
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* @size: size of the range in bytes
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* @flags: reservation flags (see linux/bootmem.h)
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*
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* Partial pages will be reserved.
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*
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* Only physical pages that actually reside on @pgdat are marked.
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*/
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int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
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unsigned long size, int flags)
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{
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int ret;
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ret = can_reserve_bootmem_core(pgdat->bdata, physaddr, size, flags);
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if (ret < 0)
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return -ENOMEM;
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reserve_bootmem_core(pgdat->bdata, physaddr, size, flags);
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return 0;
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}
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#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
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/**
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* reserve_bootmem - mark a page range as usable
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* @addr: starting address of the range
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* @size: size of the range in bytes
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* @flags: reservation flags (see linux/bootmem.h)
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*
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* Partial pages will be reserved.
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*
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* All physical pages within the range are marked, no matter what
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* node they reside on.
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*/
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int __init reserve_bootmem(unsigned long addr, unsigned long size,
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int flags)
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{
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bootmem_data_t *bdata;
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int ret;
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list_for_each_entry(bdata, &bdata_list, list) {
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ret = can_reserve_bootmem_core(bdata, addr, size, flags);
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if (ret < 0)
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return ret;
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}
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list_for_each_entry(bdata, &bdata_list, list)
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reserve_bootmem_core(bdata, addr, size, flags);
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return 0;
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}
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#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
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/*
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* We 'merge' subsequent allocations to save space. We might 'lose'
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* some fraction of a page if allocations cannot be satisfied due to
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* size constraints on boxes where there is physical RAM space
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* fragmentation - in these cases (mostly large memory boxes) this
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* is not a problem.
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*
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* On low memory boxes we get it right in 100% of the cases.
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*
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* alignment has to be a power of 2 value.
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*
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* NOTE: This function is _not_ reentrant.
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*/
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static void * __init
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alloc_bootmem_core(struct bootmem_data *bdata, unsigned long size,
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unsigned long align, unsigned long goal, unsigned long limit)
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{
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unsigned long areasize, preferred;
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unsigned long i, start = 0, incr, eidx, end_pfn;
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void *ret;
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unsigned long node_boot_start;
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void *node_bootmem_map;
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if (!size) {
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printk("alloc_bootmem_core(): zero-sized request\n");
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BUG();
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}
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BUG_ON(align & (align-1));
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/* on nodes without memory - bootmem_map is NULL */
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if (!bdata->node_bootmem_map)
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return NULL;
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bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
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bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
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align, goal, limit);
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/* bdata->node_boot_start is supposed to be (12+6)bits alignment on x86_64 ? */
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node_boot_start = bdata->node_boot_start;
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node_bootmem_map = bdata->node_bootmem_map;
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if (align) {
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node_boot_start = ALIGN(bdata->node_boot_start, align);
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if (node_boot_start > bdata->node_boot_start)
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node_bootmem_map = (unsigned long *)bdata->node_bootmem_map +
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PFN_DOWN(node_boot_start - bdata->node_boot_start)/BITS_PER_LONG;
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}
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if (limit && node_boot_start >= limit)
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return NULL;
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end_pfn = bdata->node_low_pfn;
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limit = PFN_DOWN(limit);
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if (limit && end_pfn > limit)
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end_pfn = limit;
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eidx = end_pfn - PFN_DOWN(node_boot_start);
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/*
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* We try to allocate bootmem pages above 'goal'
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* first, then we try to allocate lower pages.
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*/
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preferred = 0;
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if (goal && PFN_DOWN(goal) < end_pfn) {
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if (goal > node_boot_start)
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preferred = goal - node_boot_start;
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|
|
if (bdata->last_success > node_boot_start &&
|
|
bdata->last_success - node_boot_start >= preferred)
|
|
if (!limit || (limit && limit > bdata->last_success))
|
|
preferred = bdata->last_success - node_boot_start;
|
|
}
|
|
|
|
preferred = PFN_DOWN(ALIGN(preferred, align));
|
|
areasize = (size + PAGE_SIZE-1) / PAGE_SIZE;
|
|
incr = align >> PAGE_SHIFT ? : 1;
|
|
|
|
restart_scan:
|
|
for (i = preferred; i < eidx;) {
|
|
unsigned long j;
|
|
|
|
i = find_next_zero_bit(node_bootmem_map, eidx, i);
|
|
i = ALIGN(i, incr);
|
|
if (i >= eidx)
|
|
break;
|
|
if (test_bit(i, node_bootmem_map)) {
|
|
i += incr;
|
|
continue;
|
|
}
|
|
for (j = i + 1; j < i + areasize; ++j) {
|
|
if (j >= eidx)
|
|
goto fail_block;
|
|
if (test_bit(j, node_bootmem_map))
|
|
goto fail_block;
|
|
}
|
|
start = i;
|
|
goto found;
|
|
fail_block:
|
|
i = ALIGN(j, incr);
|
|
if (i == j)
|
|
i += incr;
|
|
}
|
|
|
|
if (preferred > 0) {
|
|
preferred = 0;
|
|
goto restart_scan;
|
|
}
|
|
return NULL;
|
|
|
|
found:
|
|
bdata->last_success = PFN_PHYS(start) + node_boot_start;
|
|
BUG_ON(start >= eidx);
|
|
|
|
/*
|
|
* Is the next page of the previous allocation-end the start
|
|
* of this allocation's buffer? If yes then we can 'merge'
|
|
* the previous partial page with this allocation.
|
|
*/
|
|
if (align < PAGE_SIZE &&
|
|
bdata->last_offset && bdata->last_pos+1 == start) {
|
|
unsigned long offset, remaining_size;
|
|
offset = ALIGN(bdata->last_offset, align);
|
|
BUG_ON(offset > PAGE_SIZE);
|
|
remaining_size = PAGE_SIZE - offset;
|
|
if (size < remaining_size) {
|
|
areasize = 0;
|
|
/* last_pos unchanged */
|
|
bdata->last_offset = offset + size;
|
|
ret = phys_to_virt(bdata->last_pos * PAGE_SIZE +
|
|
offset + node_boot_start);
|
|
} else {
|
|
remaining_size = size - remaining_size;
|
|
areasize = (remaining_size + PAGE_SIZE-1) / PAGE_SIZE;
|
|
ret = phys_to_virt(bdata->last_pos * PAGE_SIZE +
|
|
offset + node_boot_start);
|
|
bdata->last_pos = start + areasize - 1;
|
|
bdata->last_offset = remaining_size;
|
|
}
|
|
bdata->last_offset &= ~PAGE_MASK;
|
|
} else {
|
|
bdata->last_pos = start + areasize - 1;
|
|
bdata->last_offset = size & ~PAGE_MASK;
|
|
ret = phys_to_virt(start * PAGE_SIZE + node_boot_start);
|
|
}
|
|
|
|
bdebug("nid=%td start=%lx end=%lx\n",
|
|
bdata - bootmem_node_data,
|
|
start + PFN_DOWN(bdata->node_boot_start),
|
|
start + areasize + PFN_DOWN(bdata->node_boot_start));
|
|
|
|
/*
|
|
* Reserve the area now:
|
|
*/
|
|
for (i = start; i < start + areasize; i++)
|
|
if (unlikely(test_and_set_bit(i, node_bootmem_map)))
|
|
BUG();
|
|
memset(ret, 0, size);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* __alloc_bootmem_nopanic - allocate boot memory without panicking
|
|
* @size: size of the request in bytes
|
|
* @align: alignment of the region
|
|
* @goal: preferred starting address of the region
|
|
*
|
|
* The goal is dropped if it can not be satisfied and the allocation will
|
|
* fall back to memory below @goal.
|
|
*
|
|
* Allocation may happen on any node in the system.
|
|
*
|
|
* Returns NULL on failure.
|
|
*/
|
|
void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
|
|
unsigned long goal)
|
|
{
|
|
bootmem_data_t *bdata;
|
|
void *ptr;
|
|
|
|
list_for_each_entry(bdata, &bdata_list, list) {
|
|
ptr = alloc_bootmem_core(bdata, size, align, goal, 0);
|
|
if (ptr)
|
|
return ptr;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* __alloc_bootmem - allocate boot memory
|
|
* @size: size of the request in bytes
|
|
* @align: alignment of the region
|
|
* @goal: preferred starting address of the region
|
|
*
|
|
* The goal is dropped if it can not be satisfied and the allocation will
|
|
* fall back to memory below @goal.
|
|
*
|
|
* Allocation may happen on any node in the system.
|
|
*
|
|
* The function panics if the request can not be satisfied.
|
|
*/
|
|
void * __init __alloc_bootmem(unsigned long size, unsigned long align,
|
|
unsigned long goal)
|
|
{
|
|
void *mem = __alloc_bootmem_nopanic(size,align,goal);
|
|
|
|
if (mem)
|
|
return mem;
|
|
/*
|
|
* Whoops, we cannot satisfy the allocation request.
|
|
*/
|
|
printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
|
|
panic("Out of memory");
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* __alloc_bootmem_node - allocate boot memory from a specific node
|
|
* @pgdat: node to allocate from
|
|
* @size: size of the request in bytes
|
|
* @align: alignment of the region
|
|
* @goal: preferred starting address of the region
|
|
*
|
|
* The goal is dropped if it can not be satisfied and the allocation will
|
|
* fall back to memory below @goal.
|
|
*
|
|
* Allocation may fall back to any node in the system if the specified node
|
|
* can not hold the requested memory.
|
|
*
|
|
* The function panics if the request can not be satisfied.
|
|
*/
|
|
void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
|
|
unsigned long align, unsigned long goal)
|
|
{
|
|
void *ptr;
|
|
|
|
ptr = alloc_bootmem_core(pgdat->bdata, size, align, goal, 0);
|
|
if (ptr)
|
|
return ptr;
|
|
|
|
return __alloc_bootmem(size, align, goal);
|
|
}
|
|
|
|
#ifdef CONFIG_SPARSEMEM
|
|
/**
|
|
* alloc_bootmem_section - allocate boot memory from a specific section
|
|
* @size: size of the request in bytes
|
|
* @section_nr: sparse map section to allocate from
|
|
*
|
|
* Return NULL on failure.
|
|
*/
|
|
void * __init alloc_bootmem_section(unsigned long size,
|
|
unsigned long section_nr)
|
|
{
|
|
void *ptr;
|
|
unsigned long limit, goal, start_nr, end_nr, pfn;
|
|
struct pglist_data *pgdat;
|
|
|
|
pfn = section_nr_to_pfn(section_nr);
|
|
goal = PFN_PHYS(pfn);
|
|
limit = PFN_PHYS(section_nr_to_pfn(section_nr + 1)) - 1;
|
|
pgdat = NODE_DATA(early_pfn_to_nid(pfn));
|
|
ptr = alloc_bootmem_core(pgdat->bdata, size, SMP_CACHE_BYTES, goal,
|
|
limit);
|
|
|
|
if (!ptr)
|
|
return NULL;
|
|
|
|
start_nr = pfn_to_section_nr(PFN_DOWN(__pa(ptr)));
|
|
end_nr = pfn_to_section_nr(PFN_DOWN(__pa(ptr) + size));
|
|
if (start_nr != section_nr || end_nr != section_nr) {
|
|
printk(KERN_WARNING "alloc_bootmem failed on section %ld.\n",
|
|
section_nr);
|
|
free_bootmem_core(pgdat->bdata, __pa(ptr), size);
|
|
ptr = NULL;
|
|
}
|
|
|
|
return ptr;
|
|
}
|
|
#endif
|
|
|
|
void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
|
|
unsigned long align, unsigned long goal)
|
|
{
|
|
void *ptr;
|
|
|
|
ptr = alloc_bootmem_core(pgdat->bdata, size, align, goal, 0);
|
|
if (ptr)
|
|
return ptr;
|
|
|
|
return __alloc_bootmem_nopanic(size, align, goal);
|
|
}
|
|
|
|
#ifndef ARCH_LOW_ADDRESS_LIMIT
|
|
#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
|
|
#endif
|
|
|
|
/**
|
|
* __alloc_bootmem_low - allocate low boot memory
|
|
* @size: size of the request in bytes
|
|
* @align: alignment of the region
|
|
* @goal: preferred starting address of the region
|
|
*
|
|
* The goal is dropped if it can not be satisfied and the allocation will
|
|
* fall back to memory below @goal.
|
|
*
|
|
* Allocation may happen on any node in the system.
|
|
*
|
|
* The function panics if the request can not be satisfied.
|
|
*/
|
|
void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
|
|
unsigned long goal)
|
|
{
|
|
bootmem_data_t *bdata;
|
|
void *ptr;
|
|
|
|
list_for_each_entry(bdata, &bdata_list, list) {
|
|
ptr = alloc_bootmem_core(bdata, size, align, goal,
|
|
ARCH_LOW_ADDRESS_LIMIT);
|
|
if (ptr)
|
|
return ptr;
|
|
}
|
|
|
|
/*
|
|
* Whoops, we cannot satisfy the allocation request.
|
|
*/
|
|
printk(KERN_ALERT "low bootmem alloc of %lu bytes failed!\n", size);
|
|
panic("Out of low memory");
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* __alloc_bootmem_low_node - allocate low boot memory from a specific node
|
|
* @pgdat: node to allocate from
|
|
* @size: size of the request in bytes
|
|
* @align: alignment of the region
|
|
* @goal: preferred starting address of the region
|
|
*
|
|
* The goal is dropped if it can not be satisfied and the allocation will
|
|
* fall back to memory below @goal.
|
|
*
|
|
* Allocation may fall back to any node in the system if the specified node
|
|
* can not hold the requested memory.
|
|
*
|
|
* The function panics if the request can not be satisfied.
|
|
*/
|
|
void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
|
|
unsigned long align, unsigned long goal)
|
|
{
|
|
return alloc_bootmem_core(pgdat->bdata, size, align, goal,
|
|
ARCH_LOW_ADDRESS_LIMIT);
|
|
}
|