summaryrefslogtreecommitdiff
path: root/mm/bootmem.c
diff options
context:
space:
mode:
Diffstat (limited to 'mm/bootmem.c')
-rw-r--r--mm/bootmem.c861
1 files changed, 861 insertions, 0 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c
new file mode 100644
index 000000000..477be6965
--- /dev/null
+++ b/mm/bootmem.c
@@ -0,0 +1,861 @@
+/*
+ * bootmem - A boot-time physical memory allocator and configurator
+ *
+ * Copyright (C) 1999 Ingo Molnar
+ * 1999 Kanoj Sarcar, SGI
+ * 2008 Johannes Weiner
+ *
+ * Access to this subsystem has to be serialized externally (which is true
+ * for the boot process anyway).
+ */
+#include <linux/init.h>
+#include <linux/pfn.h>
+#include <linux/slab.h>
+#include <linux/bootmem.h>
+#include <linux/export.h>
+#include <linux/kmemleak.h>
+#include <linux/range.h>
+#include <linux/memblock.h>
+#include <linux/bug.h>
+#include <linux/io.h>
+
+#include <asm/processor.h>
+
+#include "internal.h"
+
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+struct pglist_data __refdata contig_page_data = {
+ .bdata = &bootmem_node_data[0]
+};
+EXPORT_SYMBOL(contig_page_data);
+#endif
+
+unsigned long max_low_pfn;
+unsigned long min_low_pfn;
+unsigned long max_pfn;
+
+bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
+
+static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
+
+static int bootmem_debug;
+
+static int __init bootmem_debug_setup(char *buf)
+{
+ bootmem_debug = 1;
+ return 0;
+}
+early_param("bootmem_debug", bootmem_debug_setup);
+
+#define bdebug(fmt, args...) ({ \
+ if (unlikely(bootmem_debug)) \
+ printk(KERN_INFO \
+ "bootmem::%s " fmt, \
+ __func__, ## args); \
+})
+
+static unsigned long __init bootmap_bytes(unsigned long pages)
+{
+ unsigned long bytes = DIV_ROUND_UP(pages, 8);
+
+ return ALIGN(bytes, sizeof(long));
+}
+
+/**
+ * bootmem_bootmap_pages - calculate bitmap size in pages
+ * @pages: number of pages the bitmap has to represent
+ */
+unsigned long __init bootmem_bootmap_pages(unsigned long pages)
+{
+ unsigned long bytes = bootmap_bytes(pages);
+
+ return PAGE_ALIGN(bytes) >> PAGE_SHIFT;
+}
+
+/*
+ * link bdata in order
+ */
+static void __init link_bootmem(bootmem_data_t *bdata)
+{
+ bootmem_data_t *ent;
+
+ list_for_each_entry(ent, &bdata_list, list) {
+ if (bdata->node_min_pfn < ent->node_min_pfn) {
+ list_add_tail(&bdata->list, &ent->list);
+ return;
+ }
+ }
+
+ list_add_tail(&bdata->list, &bdata_list);
+}
+
+/*
+ * Called once to set up the allocator itself.
+ */
+static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
+ unsigned long mapstart, unsigned long start, unsigned long end)
+{
+ unsigned long mapsize;
+
+ mminit_validate_memmodel_limits(&start, &end);
+ bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
+ bdata->node_min_pfn = start;
+ bdata->node_low_pfn = end;
+ link_bootmem(bdata);
+
+ /*
+ * Initially all pages are reserved - setup_arch() has to
+ * register free RAM areas explicitly.
+ */
+ mapsize = bootmap_bytes(end - start);
+ memset(bdata->node_bootmem_map, 0xff, mapsize);
+
+ bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
+ bdata - bootmem_node_data, start, mapstart, end, mapsize);
+
+ return mapsize;
+}
+
+/**
+ * init_bootmem_node - register a node as boot memory
+ * @pgdat: node to register
+ * @freepfn: pfn where the bitmap for this node is to be placed
+ * @startpfn: first pfn on the node
+ * @endpfn: first pfn after the node
+ *
+ * Returns the number of bytes needed to hold the bitmap for this node.
+ */
+unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
+ unsigned long startpfn, unsigned long endpfn)
+{
+ return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn);
+}
+
+/**
+ * init_bootmem - register boot memory
+ * @start: pfn where the bitmap is to be placed
+ * @pages: number of available physical pages
+ *
+ * Returns the number of bytes needed to hold the bitmap.
+ */
+unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
+{
+ max_low_pfn = pages;
+ min_low_pfn = start;
+ return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages);
+}
+
+/*
+ * free_bootmem_late - free bootmem pages directly to page allocator
+ * @addr: starting physical address of the range
+ * @size: size of the range in bytes
+ *
+ * This is only useful when the bootmem allocator has already been torn
+ * down, but we are still initializing the system. Pages are given directly
+ * to the page allocator, no bootmem metadata is updated because it is gone.
+ */
+void __init free_bootmem_late(unsigned long physaddr, unsigned long size)
+{
+ unsigned long cursor, end;
+
+ kmemleak_free_part(__va(physaddr), size);
+
+ cursor = PFN_UP(physaddr);
+ end = PFN_DOWN(physaddr + size);
+
+ for (; cursor < end; cursor++) {
+ __free_pages_bootmem(pfn_to_page(cursor), 0);
+ totalram_pages++;
+ }
+}
+
+static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
+{
+ struct page *page;
+ unsigned long *map, start, end, pages, count = 0;
+
+ if (!bdata->node_bootmem_map)
+ return 0;
+
+ map = bdata->node_bootmem_map;
+ start = bdata->node_min_pfn;
+ end = bdata->node_low_pfn;
+
+ bdebug("nid=%td start=%lx end=%lx\n",
+ bdata - bootmem_node_data, start, end);
+
+ while (start < end) {
+ unsigned long idx, vec;
+ unsigned shift;
+
+ idx = start - bdata->node_min_pfn;
+ shift = idx & (BITS_PER_LONG - 1);
+ /*
+ * vec holds at most BITS_PER_LONG map bits,
+ * bit 0 corresponds to start.
+ */
+ vec = ~map[idx / BITS_PER_LONG];
+
+ if (shift) {
+ vec >>= shift;
+ if (end - start >= BITS_PER_LONG)
+ vec |= ~map[idx / BITS_PER_LONG + 1] <<
+ (BITS_PER_LONG - shift);
+ }
+ /*
+ * If we have a properly aligned and fully unreserved
+ * BITS_PER_LONG block of pages in front of us, free
+ * it in one go.
+ */
+ if (IS_ALIGNED(start, BITS_PER_LONG) && vec == ~0UL) {
+ int order = ilog2(BITS_PER_LONG);
+
+ __free_pages_bootmem(pfn_to_page(start), order);
+ count += BITS_PER_LONG;
+ start += BITS_PER_LONG;
+ } else {
+ unsigned long cur = start;
+
+ start = ALIGN(start + 1, BITS_PER_LONG);
+ while (vec && cur != start) {
+ if (vec & 1) {
+ page = pfn_to_page(cur);
+ __free_pages_bootmem(page, 0);
+ count++;
+ }
+ vec >>= 1;
+ ++cur;
+ }
+ }
+ }
+
+ page = virt_to_page(bdata->node_bootmem_map);
+ pages = bdata->node_low_pfn - bdata->node_min_pfn;
+ pages = bootmem_bootmap_pages(pages);
+ count += pages;
+ while (pages--)
+ __free_pages_bootmem(page++, 0);
+
+ bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
+
+ return count;
+}
+
+static int reset_managed_pages_done __initdata;
+
+void reset_node_managed_pages(pg_data_t *pgdat)
+{
+ struct zone *z;
+
+ for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
+ z->managed_pages = 0;
+}
+
+void __init reset_all_zones_managed_pages(void)
+{
+ struct pglist_data *pgdat;
+
+ if (reset_managed_pages_done)
+ return;
+
+ for_each_online_pgdat(pgdat)
+ reset_node_managed_pages(pgdat);
+
+ reset_managed_pages_done = 1;
+}
+
+/**
+ * free_all_bootmem - release free pages to the buddy allocator
+ *
+ * Returns the number of pages actually released.
+ */
+unsigned long __init free_all_bootmem(void)
+{
+ unsigned long total_pages = 0;
+ bootmem_data_t *bdata;
+
+ reset_all_zones_managed_pages();
+
+ list_for_each_entry(bdata, &bdata_list, list)
+ total_pages += free_all_bootmem_core(bdata);
+
+ totalram_pages += total_pages;
+
+ return total_pages;
+}
+
+static void __init __free(bootmem_data_t *bdata,
+ unsigned long sidx, unsigned long eidx)
+{
+ unsigned long idx;
+
+ bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
+ sidx + bdata->node_min_pfn,
+ eidx + bdata->node_min_pfn);
+
+ if (bdata->hint_idx > sidx)
+ bdata->hint_idx = sidx;
+
+ for (idx = sidx; idx < eidx; idx++)
+ if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
+ BUG();
+}
+
+static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
+ unsigned long eidx, int flags)
+{
+ unsigned long idx;
+ int exclusive = flags & BOOTMEM_EXCLUSIVE;
+
+ bdebug("nid=%td start=%lx end=%lx flags=%x\n",
+ bdata - bootmem_node_data,
+ sidx + bdata->node_min_pfn,
+ eidx + bdata->node_min_pfn,
+ flags);
+
+ for (idx = sidx; idx < eidx; idx++)
+ if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
+ if (exclusive) {
+ __free(bdata, sidx, idx);
+ return -EBUSY;
+ }
+ bdebug("silent double reserve of PFN %lx\n",
+ idx + bdata->node_min_pfn);
+ }
+ return 0;
+}
+
+static int __init mark_bootmem_node(bootmem_data_t *bdata,
+ unsigned long start, unsigned long end,
+ int reserve, int flags)
+{
+ unsigned long sidx, eidx;
+
+ bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
+ bdata - bootmem_node_data, start, end, reserve, flags);
+
+ BUG_ON(start < bdata->node_min_pfn);
+ BUG_ON(end > bdata->node_low_pfn);
+
+ sidx = start - bdata->node_min_pfn;
+ eidx = end - bdata->node_min_pfn;
+
+ if (reserve)
+ return __reserve(bdata, sidx, eidx, flags);
+ else
+ __free(bdata, sidx, eidx);
+ return 0;
+}
+
+static int __init mark_bootmem(unsigned long start, unsigned long end,
+ int reserve, int flags)
+{
+ unsigned long pos;
+ bootmem_data_t *bdata;
+
+ pos = start;
+ list_for_each_entry(bdata, &bdata_list, list) {
+ int err;
+ unsigned long max;
+
+ if (pos < bdata->node_min_pfn ||
+ pos >= bdata->node_low_pfn) {
+ BUG_ON(pos != start);
+ continue;
+ }
+
+ max = min(bdata->node_low_pfn, end);
+
+ err = mark_bootmem_node(bdata, pos, max, reserve, flags);
+ if (reserve && err) {
+ mark_bootmem(start, pos, 0, 0);
+ return err;
+ }
+
+ if (max == end)
+ return 0;
+ pos = bdata->node_low_pfn;
+ }
+ BUG();
+}
+
+/**
+ * free_bootmem_node - mark a page range as usable
+ * @pgdat: node the range resides on
+ * @physaddr: starting address of the range
+ * @size: size of the range in bytes
+ *
+ * Partial pages will be considered reserved and left as they are.
+ *
+ * The range must reside completely on the specified node.
+ */
+void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
+ unsigned long size)
+{
+ unsigned long start, end;
+
+ kmemleak_free_part(__va(physaddr), size);
+
+ start = PFN_UP(physaddr);
+ end = PFN_DOWN(physaddr + size);
+
+ mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
+}
+
+/**
+ * free_bootmem - mark a page range as usable
+ * @addr: starting physical address of the range
+ * @size: size of the range in bytes
+ *
+ * Partial pages will be considered reserved and left as they are.
+ *
+ * The range must be contiguous but may span node boundaries.
+ */
+void __init free_bootmem(unsigned long physaddr, unsigned long size)
+{
+ unsigned long start, end;
+
+ kmemleak_free_part(__va(physaddr), size);
+
+ start = PFN_UP(physaddr);
+ end = PFN_DOWN(physaddr + size);
+
+ mark_bootmem(start, end, 0, 0);
+}
+
+/**
+ * reserve_bootmem_node - mark a page range as reserved
+ * @pgdat: node the range resides on
+ * @physaddr: starting address of the range
+ * @size: size of the range in bytes
+ * @flags: reservation flags (see linux/bootmem.h)
+ *
+ * Partial pages will be reserved.
+ *
+ * The range must reside completely on the specified node.
+ */
+int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
+ unsigned long size, int flags)
+{
+ unsigned long start, end;
+
+ start = PFN_DOWN(physaddr);
+ end = PFN_UP(physaddr + size);
+
+ return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
+}
+
+/**
+ * reserve_bootmem - mark a page range as reserved
+ * @addr: starting address of the range
+ * @size: size of the range in bytes
+ * @flags: reservation flags (see linux/bootmem.h)
+ *
+ * Partial pages will be reserved.
+ *
+ * The range must be contiguous but may span node boundaries.
+ */
+int __init reserve_bootmem(unsigned long addr, unsigned long size,
+ int flags)
+{
+ unsigned long start, end;
+
+ start = PFN_DOWN(addr);
+ end = PFN_UP(addr + size);
+
+ return mark_bootmem(start, end, 1, flags);
+}
+
+static unsigned long __init align_idx(struct bootmem_data *bdata,
+ unsigned long idx, unsigned long step)
+{
+ unsigned long base = bdata->node_min_pfn;
+
+ /*
+ * Align the index with respect to the node start so that the
+ * combination of both satisfies the requested alignment.
+ */
+
+ return ALIGN(base + idx, step) - base;
+}
+
+static unsigned long __init align_off(struct bootmem_data *bdata,
+ unsigned long off, unsigned long align)
+{
+ unsigned long base = PFN_PHYS(bdata->node_min_pfn);
+
+ /* Same as align_idx for byte offsets */
+
+ return ALIGN(base + off, align) - base;
+}
+
+static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
+ unsigned long size, unsigned long align,
+ unsigned long goal, unsigned long limit)
+{
+ unsigned long fallback = 0;
+ unsigned long min, max, start, sidx, midx, step;
+
+ bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
+ bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
+ align, goal, limit);
+
+ BUG_ON(!size);
+ BUG_ON(align & (align - 1));
+ BUG_ON(limit && goal + size > limit);
+
+ if (!bdata->node_bootmem_map)
+ return NULL;
+
+ min = bdata->node_min_pfn;
+ max = bdata->node_low_pfn;
+
+ goal >>= PAGE_SHIFT;
+ limit >>= PAGE_SHIFT;
+
+ if (limit && max > limit)
+ max = limit;
+ if (max <= min)
+ return NULL;
+
+ step = max(align >> PAGE_SHIFT, 1UL);
+
+ if (goal && min < goal && goal < max)
+ start = ALIGN(goal, step);
+ else
+ start = ALIGN(min, step);
+
+ sidx = start - bdata->node_min_pfn;
+ midx = max - bdata->node_min_pfn;
+
+ if (bdata->hint_idx > sidx) {
+ /*
+ * Handle the valid case of sidx being zero and still
+ * catch the fallback below.
+ */
+ fallback = sidx + 1;
+ sidx = align_idx(bdata, bdata->hint_idx, step);
+ }
+
+ while (1) {
+ int merge;
+ void *region;
+ unsigned long eidx, i, start_off, end_off;
+find_block:
+ sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
+ sidx = align_idx(bdata, sidx, step);
+ eidx = sidx + PFN_UP(size);
+
+ if (sidx >= midx || eidx > midx)
+ break;
+
+ for (i = sidx; i < eidx; i++)
+ if (test_bit(i, bdata->node_bootmem_map)) {
+ sidx = align_idx(bdata, i, step);
+ if (sidx == i)
+ sidx += step;
+ goto find_block;
+ }
+
+ if (bdata->last_end_off & (PAGE_SIZE - 1) &&
+ PFN_DOWN(bdata->last_end_off) + 1 == sidx)
+ start_off = align_off(bdata, bdata->last_end_off, align);
+ else
+ start_off = PFN_PHYS(sidx);
+
+ merge = PFN_DOWN(start_off) < sidx;
+ end_off = start_off + size;
+
+ bdata->last_end_off = end_off;
+ bdata->hint_idx = PFN_UP(end_off);
+
+ /*
+ * Reserve the area now:
+ */
+ if (__reserve(bdata, PFN_DOWN(start_off) + merge,
+ PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
+ BUG();
+
+ region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
+ start_off);
+ memset(region, 0, size);
+ /*
+ * The min_count is set to 0 so that bootmem allocated blocks
+ * are never reported as leaks.
+ */
+ kmemleak_alloc(region, size, 0, 0);
+ return region;
+ }
+
+ if (fallback) {
+ sidx = align_idx(bdata, fallback - 1, step);
+ fallback = 0;
+ goto find_block;
+ }
+
+ return NULL;
+}
+
+static void * __init alloc_bootmem_core(unsigned long size,
+ unsigned long align,
+ unsigned long goal,
+ unsigned long limit)
+{
+ bootmem_data_t *bdata;
+ void *region;
+
+ if (WARN_ON_ONCE(slab_is_available()))
+ return kzalloc(size, GFP_NOWAIT);
+
+ list_for_each_entry(bdata, &bdata_list, list) {
+ if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
+ continue;
+ if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
+ break;
+
+ region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
+ if (region)
+ return region;
+ }
+
+ return NULL;
+}
+
+static void * __init ___alloc_bootmem_nopanic(unsigned long size,
+ unsigned long align,
+ unsigned long goal,
+ unsigned long limit)
+{
+ void *ptr;
+
+restart:
+ ptr = alloc_bootmem_core(size, align, goal, limit);
+ if (ptr)
+ return ptr;
+ if (goal) {
+ goal = 0;
+ goto restart;
+ }
+
+ return NULL;
+}
+
+/**
+ * __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)
+{
+ unsigned long limit = 0;
+
+ return ___alloc_bootmem_nopanic(size, align, goal, limit);
+}
+
+static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
+ unsigned long goal, unsigned long limit)
+{
+ void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
+
+ 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 - 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)
+{
+ unsigned long limit = 0;
+
+ return ___alloc_bootmem(size, align, goal, limit);
+}
+
+void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
+ unsigned long size, unsigned long align,
+ unsigned long goal, unsigned long limit)
+{
+ void *ptr;
+
+ if (WARN_ON_ONCE(slab_is_available()))
+ return kzalloc(size, GFP_NOWAIT);
+again:
+
+ /* do not panic in alloc_bootmem_bdata() */
+ if (limit && goal + size > limit)
+ limit = 0;
+
+ ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
+ if (ptr)
+ return ptr;
+
+ ptr = alloc_bootmem_core(size, align, goal, limit);
+ if (ptr)
+ return ptr;
+
+ if (goal) {
+ goal = 0;
+ goto again;
+ }
+
+ return NULL;
+}
+
+void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
+ unsigned long align, unsigned long goal)
+{
+ if (WARN_ON_ONCE(slab_is_available()))
+ return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
+
+ return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
+}
+
+void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
+ unsigned long align, unsigned long goal,
+ unsigned long limit)
+{
+ void *ptr;
+
+ ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
+ if (ptr)
+ return ptr;
+
+ 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)
+{
+ if (WARN_ON_ONCE(slab_is_available()))
+ return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
+
+ return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
+}
+
+void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
+ unsigned long align, unsigned long goal)
+{
+#ifdef MAX_DMA32_PFN
+ unsigned long end_pfn;
+
+ if (WARN_ON_ONCE(slab_is_available()))
+ return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
+
+ /* update goal according ...MAX_DMA32_PFN */
+ end_pfn = pgdat_end_pfn(pgdat);
+
+ if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
+ (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
+ void *ptr;
+ unsigned long new_goal;
+
+ new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
+ ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
+ new_goal, 0);
+ if (ptr)
+ return ptr;
+ }
+#endif
+
+ return __alloc_bootmem_node(pgdat, 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)
+{
+ return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
+}
+
+void * __init __alloc_bootmem_low_nopanic(unsigned long size,
+ unsigned long align,
+ unsigned long goal)
+{
+ return ___alloc_bootmem_nopanic(size, align, goal,
+ ARCH_LOW_ADDRESS_LIMIT);
+}
+
+/**
+ * __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)
+{
+ if (WARN_ON_ONCE(slab_is_available()))
+ return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
+
+ return ___alloc_bootmem_node(pgdat, size, align,
+ goal, ARCH_LOW_ADDRESS_LIMIT);
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-26 01:29:29 +0000