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Subject[PATCH 22/35] bootmem: Add nobootmem.c to reduce the #ifdef
Date
Introduce nobootmem.c to hold wrapper for CONFIG_NO_BOOTMEM=y.

that will remove related #ifdef in bootmem.c

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
mm/Makefile | 8 +-
mm/bootmem.c | 151 +----------------------
mm/nobootmem.c | 389 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 397 insertions(+), 151 deletions(-)
create mode 100644 mm/nobootmem.c
diff --git a/mm/Makefile b/mm/Makefile
index 6c2a73a..08c58d5 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -7,12 +7,18 @@ mmu-$(CONFIG_MMU) := fremap.o highmem.o madvise.o memory.o mincore.o \
mlock.o mmap.o mprotect.o mremap.o msync.o rmap.o \
vmalloc.o pagewalk.o

-obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
+obj-y := filemap.o mempool.o oom_kill.o fadvise.o \
maccess.o page_alloc.o page-writeback.o \
readahead.o swap.o truncate.o vmscan.o shmem.o \
prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \
page_isolation.o mm_init.o mmu_context.o \
$(mmu-y)
+ifdef CONFIG_NO_BOOTMEM
+ obj-y += nobootmem.o
+else
+ obj-y += bootmem.o
+endif
+
obj-y += init-mm.o

obj-$(CONFIG_BOUNCE) += bounce.o
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 2a4c8b5..2741c34 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -35,7 +35,6 @@ unsigned long max_pfn;
unsigned long saved_max_pfn;
#endif

-#ifndef CONFIG_NO_BOOTMEM
bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;

static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
@@ -146,7 +145,7 @@ unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
min_low_pfn = start;
return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages);
}
-#endif
+
/*
* free_bootmem_late - free bootmem pages directly to page allocator
* @addr: starting address of the range
@@ -171,53 +170,6 @@ void __init free_bootmem_late(unsigned long addr, unsigned long size)
}
}

-#ifdef CONFIG_NO_BOOTMEM
-static void __init __free_pages_memory(unsigned long start, unsigned long end)
-{
- int i;
- unsigned long start_aligned, end_aligned;
- int order = ilog2(BITS_PER_LONG);
-
- start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
- end_aligned = end & ~(BITS_PER_LONG - 1);
-
- if (end_aligned <= start_aligned) {
- for (i = start; i < end; i++)
- __free_pages_bootmem(pfn_to_page(i), 0);
-
- return;
- }
-
- for (i = start; i < start_aligned; i++)
- __free_pages_bootmem(pfn_to_page(i), 0);
-
- for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
- __free_pages_bootmem(pfn_to_page(i), order);
-
- for (i = end_aligned; i < end; i++)
- __free_pages_bootmem(pfn_to_page(i), 0);
-}
-
-unsigned long __init free_all_memory_core_early(int nodeid)
-{
- int i;
- u64 start, end;
- unsigned long count = 0;
- struct range *range = NULL;
- int nr_range;
-
- nr_range = get_free_all_memory_range(&range, nodeid);
-
- for (i = 0; i < nr_range; i++) {
- start = range[i].start;
- end = range[i].end;
- count += end - start;
- __free_pages_memory(start, end);
- }
-
- return count;
-}
-#else
static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
{
int aligned;
@@ -278,7 +230,6 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)

return count;
}
-#endif

/**
* free_all_bootmem_node - release a node's free pages to the buddy allocator
@@ -289,12 +240,7 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
{
register_page_bootmem_info_node(pgdat);
-#ifdef CONFIG_NO_BOOTMEM
- /* free_all_memory_core_early(MAX_NUMNODES) will be called later */
- return 0;
-#else
return free_all_bootmem_core(pgdat->bdata);
-#endif
}

/**
@@ -304,16 +250,6 @@ unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
*/
unsigned long __init free_all_bootmem(void)
{
-#ifdef CONFIG_NO_BOOTMEM
- /*
- * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
- * because in some case like Node0 doesnt have RAM installed
- * low ram will be on Node1
- * Use MAX_NUMNODES will make sure all ranges in early_node_map[]
- * will be used instead of only Node0 related
- */
- return free_all_memory_core_early(MAX_NUMNODES);
-#else
unsigned long total_pages = 0;
bootmem_data_t *bdata;

@@ -321,10 +257,8 @@ unsigned long __init free_all_bootmem(void)
total_pages += free_all_bootmem_core(bdata);

return total_pages;
-#endif
}

-#ifndef CONFIG_NO_BOOTMEM
static void __init __free(bootmem_data_t *bdata,
unsigned long sidx, unsigned long eidx)
{
@@ -419,7 +353,6 @@ static int __init mark_bootmem(unsigned long start, unsigned long end,
}
BUG();
}
-#endif

/**
* free_bootmem_node - mark a page range as usable
@@ -434,9 +367,6 @@ static int __init mark_bootmem(unsigned long start, unsigned long end,
void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
unsigned long size)
{
-#ifdef CONFIG_NO_BOOTMEM
- lmb_free_area(physaddr, physaddr + size);
-#else
unsigned long start, end;

kmemleak_free_part(__va(physaddr), size);
@@ -445,7 +375,6 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
end = PFN_DOWN(physaddr + size);

mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
-#endif
}

/**
@@ -459,9 +388,6 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
*/
void __init free_bootmem(unsigned long addr, unsigned long size)
{
-#ifdef CONFIG_NO_BOOTMEM
- lmb_free_area(addr, addr + size);
-#else
unsigned long start, end;

kmemleak_free_part(__va(addr), size);
@@ -470,7 +396,6 @@ void __init free_bootmem(unsigned long addr, unsigned long size)
end = PFN_DOWN(addr + size);

mark_bootmem(start, end, 0, 0);
-#endif
}

/**
@@ -487,17 +412,12 @@ void __init free_bootmem(unsigned long addr, unsigned long size)
int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
unsigned long size, int flags)
{
-#ifdef CONFIG_NO_BOOTMEM
- panic("no bootmem");
- return 0;
-#else
unsigned long start, end;

start = PFN_DOWN(physaddr);
end = PFN_UP(physaddr + size);

return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
-#endif
}

/**
@@ -513,20 +433,14 @@ int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
int __init reserve_bootmem(unsigned long addr, unsigned long size,
int flags)
{
-#ifdef CONFIG_NO_BOOTMEM
- panic("no bootmem");
- return 0;
-#else
unsigned long start, end;

start = PFN_DOWN(addr);
end = PFN_UP(addr + size);

return mark_bootmem(start, end, 1, flags);
-#endif
}

-#ifndef CONFIG_NO_BOOTMEM
int __weak __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
int flags)
{
@@ -683,33 +597,12 @@ static void * __init alloc_arch_preferred_bootmem(bootmem_data_t *bdata,
#endif
return NULL;
}
-#endif

static void * __init ___alloc_bootmem_nopanic(unsigned long size,
unsigned long align,
unsigned long goal,
unsigned long limit)
{
-#ifdef CONFIG_NO_BOOTMEM
- void *ptr;
-
- if (WARN_ON_ONCE(slab_is_available()))
- return kzalloc(size, GFP_NOWAIT);
-
-restart:
-
- ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
-
- if (ptr)
- return ptr;
-
- if (goal != 0) {
- goal = 0;
- goto restart;
- }
-
- return NULL;
-#else
bootmem_data_t *bdata;
void *region;

@@ -735,7 +628,6 @@ restart:
}

return NULL;
-#endif
}

/**
@@ -756,10 +648,6 @@ void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
{
unsigned long limit = 0;

-#ifdef CONFIG_NO_BOOTMEM
- limit = -1UL;
-#endif
-
return ___alloc_bootmem_nopanic(size, align, goal, limit);
}

@@ -796,14 +684,9 @@ void * __init __alloc_bootmem(unsigned long size, unsigned long align,
{
unsigned long limit = 0;

-#ifdef CONFIG_NO_BOOTMEM
- limit = -1UL;
-#endif
-
return ___alloc_bootmem(size, align, goal, limit);
}

-#ifndef CONFIG_NO_BOOTMEM
static void * __init ___alloc_bootmem_node(bootmem_data_t *bdata,
unsigned long size, unsigned long align,
unsigned long goal, unsigned long limit)
@@ -820,7 +703,6 @@ static void * __init ___alloc_bootmem_node(bootmem_data_t *bdata,

return ___alloc_bootmem(size, align, goal, limit);
}
-#endif

/**
* __alloc_bootmem_node - allocate boot memory from a specific node
@@ -843,12 +725,7 @@ void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
if (WARN_ON_ONCE(slab_is_available()))
return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

-#ifdef CONFIG_NO_BOOTMEM
- return __alloc_memory_core_early(pgdat->node_id, size, align,
- goal, -1ULL);
-#else
return ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0);
-#endif
}

void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
@@ -869,13 +746,8 @@ void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
unsigned long new_goal;

new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
-#ifdef CONFIG_NO_BOOTMEM
- ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
- new_goal, -1ULL);
-#else
ptr = alloc_bootmem_core(pgdat->bdata, size, align,
new_goal, 0);
-#endif
if (ptr)
return ptr;
}
@@ -896,16 +768,6 @@ void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
void * __init alloc_bootmem_section(unsigned long size,
unsigned long section_nr)
{
-#ifdef CONFIG_NO_BOOTMEM
- unsigned long pfn, goal, limit;
-
- pfn = section_nr_to_pfn(section_nr);
- goal = pfn << PAGE_SHIFT;
- limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
-
- return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
- SMP_CACHE_BYTES, goal, limit);
-#else
bootmem_data_t *bdata;
unsigned long pfn, goal, limit;

@@ -915,7 +777,6 @@ void * __init alloc_bootmem_section(unsigned long size,
bdata = &bootmem_node_data[early_pfn_to_nid(pfn)];

return alloc_bootmem_core(bdata, size, SMP_CACHE_BYTES, goal, limit);
-#endif
}
#endif

@@ -927,16 +788,11 @@ void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
if (WARN_ON_ONCE(slab_is_available()))
return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

-#ifdef CONFIG_NO_BOOTMEM
- ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
- goal, -1ULL);
-#else
ptr = alloc_arch_preferred_bootmem(pgdat->bdata, size, align, goal, 0);
if (ptr)
return ptr;

ptr = alloc_bootmem_core(pgdat->bdata, size, align, goal, 0);
-#endif
if (ptr)
return ptr;

@@ -987,11 +843,6 @@ void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
if (WARN_ON_ONCE(slab_is_available()))
return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

-#ifdef CONFIG_NO_BOOTMEM
- return __alloc_memory_core_early(pgdat->node_id, size, align,
- goal, ARCH_LOW_ADDRESS_LIMIT);
-#else
return ___alloc_bootmem_node(pgdat->bdata, size, align,
goal, ARCH_LOW_ADDRESS_LIMIT);
-#endif
}
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
new file mode 100644
index 0000000..283673e
--- /dev/null
+++ b/mm/nobootmem.c
@@ -0,0 +1,389 @@
+/*
+ * 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/module.h>
+#include <linux/kmemleak.h>
+#include <linux/range.h>
+#include <linux/lmb.h>
+
+#include <asm/bug.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+
+#include "internal.h"
+
+unsigned long max_low_pfn;
+unsigned long min_low_pfn;
+unsigned long max_pfn;
+
+#ifdef CONFIG_CRASH_DUMP
+/*
+ * If we have booted due to a crash, max_pfn will be a very low value. We need
+ * to know the amount of memory that the previous kernel used.
+ */
+unsigned long saved_max_pfn;
+#endif
+
+/*
+ * free_bootmem_late - free bootmem pages directly to page allocator
+ * @addr: starting 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 addr, unsigned long size)
+{
+ unsigned long cursor, end;
+
+ kmemleak_free_part(__va(addr), size);
+
+ cursor = PFN_UP(addr);
+ end = PFN_DOWN(addr + size);
+
+ for (; cursor < end; cursor++) {
+ __free_pages_bootmem(pfn_to_page(cursor), 0);
+ totalram_pages++;
+ }
+}
+
+static void __init __free_pages_memory(unsigned long start, unsigned long end)
+{
+ int i;
+ unsigned long start_aligned, end_aligned;
+ int order = ilog2(BITS_PER_LONG);
+
+ start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
+ end_aligned = end & ~(BITS_PER_LONG - 1);
+
+ if (end_aligned <= start_aligned) {
+ for (i = start; i < end; i++)
+ __free_pages_bootmem(pfn_to_page(i), 0);
+
+ return;
+ }
+
+ for (i = start; i < start_aligned; i++)
+ __free_pages_bootmem(pfn_to_page(i), 0);
+
+ for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
+ __free_pages_bootmem(pfn_to_page(i), order);
+
+ for (i = end_aligned; i < end; i++)
+ __free_pages_bootmem(pfn_to_page(i), 0);
+}
+
+unsigned long __init free_all_memory_core_early(int nodeid)
+{
+ int i;
+ u64 start, end;
+ unsigned long count = 0;
+ struct range *range = NULL;
+ int nr_range;
+
+ nr_range = get_free_all_memory_range(&range, nodeid);
+
+ for (i = 0; i < nr_range; i++) {
+ start = range[i].start;
+ end = range[i].end;
+ count += end - start;
+ __free_pages_memory(start, end);
+ }
+
+ return count;
+}
+
+/**
+ * free_all_bootmem_node - release a node's free pages to the buddy allocator
+ * @pgdat: node to be released
+ *
+ * Returns the number of pages actually released.
+ */
+unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
+{
+ register_page_bootmem_info_node(pgdat);
+
+ /* free_all_memory_core_early(MAX_NUMNODES) will be called later */
+ return 0;
+}
+
+/**
+ * free_all_bootmem - release free pages to the buddy allocator
+ *
+ * Returns the number of pages actually released.
+ */
+unsigned long __init free_all_bootmem(void)
+{
+ /*
+ * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
+ * because in some case like Node0 doesnt have RAM installed
+ * low ram will be on Node1
+ * Use MAX_NUMNODES will make sure all ranges in early_node_map[]
+ * will be used instead of only Node0 related
+ */
+ return free_all_memory_core_early(MAX_NUMNODES);
+}
+
+/**
+ * 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)
+{
+ lmb_free_area(physaddr, physaddr + size);
+}
+
+/**
+ * free_bootmem - mark a page range as usable
+ * @addr: 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 be contiguous but may span node boundaries.
+ */
+void __init free_bootmem(unsigned long addr, unsigned long size)
+{
+ lmb_free_area(addr, addr + size);
+}
+
+static void * __init ___alloc_bootmem_nopanic(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);
+
+restart:
+
+ ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
+
+ if (ptr)
+ return ptr;
+
+ if (goal != 0) {
+ 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 = -1UL;
+
+ 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 = -1UL;
+
+ return ___alloc_bootmem(size, align, goal, limit);
+}
+
+/**
+ * __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_memory_core_early(pgdat->node_id, size, align,
+ goal, -1ULL);
+}
+
+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->node_start_pfn + pgdat->node_spanned_pages;
+
+ 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_memory_core_early(pgdat->node_id, size, align,
+ new_goal, -1ULL);
+ if (ptr)
+ return ptr;
+ }
+#endif
+
+ return __alloc_bootmem_node(pgdat, 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)
+{
+ unsigned long pfn, goal, limit;
+
+ pfn = section_nr_to_pfn(section_nr);
+ goal = pfn << PAGE_SHIFT;
+ limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
+
+ return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
+ SMP_CACHE_BYTES, goal, limit);
+}
+#endif
+
+void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
+ unsigned long align, unsigned long goal)
+{
+ void *ptr;
+
+ if (WARN_ON_ONCE(slab_is_available()))
+ return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
+
+ ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
+ goal, -1ULL);
+ 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)
+{
+ return ___alloc_bootmem(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_memory_core_early(pgdat->node_id, size, align,
+ goal, ARCH_LOW_ADDRESS_LIMIT);
+}
--
1.6.4.2


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