bootmem: Separate out CONFIG_NO_BOOTMEM code into nobootmem.c
Yinghai Lu [Thu, 24 Feb 2011 13:43:05 +0000 (14:43 +0100)]
mm/bootmem.c contained code paths for both bootmem and no bootmem
configurations.  They implement about the same set of APIs in
different ways and as a result bootmem.c contains massive amount of
#ifdef CONFIG_NO_BOOTMEM.

Separate out CONFIG_NO_BOOTMEM code into mm/nobootmem.c.  As the
common part is relatively small, duplicate them in nobootmem.c instead
of creating a common file or ifdef'ing in bootmem.c.

The followings are duplicated.

* {min|max}_low_pfn, max_pfn, saved_max_pfn
* free_bootmem_late()
* ___alloc_bootmem()
* __alloc_bootmem_low()

The followings are applicable only to nobootmem and moved verbatim.

* __free_pages_memory()
* free_all_memory_core_early()

The followings are not applicable to nobootmem and omitted in
nobootmem.c.

* reserve_bootmem_node()
* reserve_bootmem()

The rest split function bodies according to CONFIG_NO_BOOTMEM.

Makefile is updated so that only either bootmem.c or nobootmem.c is
built according to CONFIG_NO_BOOTMEM.

This patch doesn't introduce any behavior change.

-tj: Rewrote commit description.

Suggested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

mm/Makefile
mm/bootmem.c
mm/nobootmem.c [new file with mode: 0644]

index 2b1b575..42a8326 100644 (file)
@@ -7,7 +7,7 @@ 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 pgtable-generic.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 \
@@ -15,6 +15,12 @@ obj-y                        := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
                           $(mmu-y)
 obj-y += init-mm.o
 
+ifdef CONFIG_NO_BOOTMEM
+       obj-y           += nobootmem.o
+else
+       obj-y           += bootmem.o
+endif
+
 obj-$(CONFIG_HAVE_MEMBLOCK) += memblock.o
 
 obj-$(CONFIG_BOUNCE)   += bounce.o
index 13b0caa..4403e2f 100644 (file)
@@ -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
@@ -434,10 +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
-       kmemleak_free_part(__va(physaddr), size);
-       memblock_x86_free_range(physaddr, physaddr + size);
-#else
        unsigned long start, end;
 
        kmemleak_free_part(__va(physaddr), size);
@@ -446,7 +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
 }
 
 /**
@@ -460,10 +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
-       kmemleak_free_part(__va(addr), size);
-       memblock_x86_free_range(addr, addr + size);
-#else
        unsigned long start, end;
 
        kmemleak_free_part(__va(addr), size);
@@ -472,7 +396,6 @@ void __init free_bootmem(unsigned long addr, unsigned long size)
        end = PFN_DOWN(addr + size);
 
        mark_bootmem(start, end, 0, 0);
-#endif
 }
 
 /**
@@ -489,17 +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
 }
 
 /**
@@ -515,20 +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)
 {
@@ -685,33 +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;
 
@@ -737,7 +628,6 @@ restart:
        }
 
        return NULL;
-#endif
 }
 
 /**
@@ -758,10 +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);
 }
 
@@ -798,14 +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)
@@ -822,7 +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
@@ -842,24 +722,10 @@ static void * __init ___alloc_bootmem_node(bootmem_data_t *bdata,
 void * __init __alloc_bootmem_node(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);
 
-#ifdef CONFIG_NO_BOOTMEM
-       ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
-                                        goal, -1ULL);
-       if (ptr)
-               return ptr;
-
-       ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
-                                        goal, -1ULL);
-#else
-       ptr = ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0);
-#endif
-
-       return ptr;
+       return  ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0);
 }
 
 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
@@ -880,13 +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;
        }
@@ -907,16 +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;
 
@@ -926,7 +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
 
@@ -938,16 +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;
 
@@ -995,21 +840,9 @@ void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 void * __init __alloc_bootmem_low_node(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);
 
-#ifdef CONFIG_NO_BOOTMEM
-       ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
+       return ___alloc_bootmem_node(pgdat->bdata, size, align,
                                goal, ARCH_LOW_ADDRESS_LIMIT);
-       if (ptr)
-               return ptr;
-       ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
-                               goal, ARCH_LOW_ADDRESS_LIMIT);
-#else
-       ptr = ___alloc_bootmem_node(pgdat->bdata, size, align,
-                               goal, ARCH_LOW_ADDRESS_LIMIT);
-#endif
-       return ptr;
 }
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
new file mode 100644 (file)
index 0000000..f220b8d
--- /dev/null
@@ -0,0 +1,405 @@
+/*
+ *  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/memblock.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)
+{
+       kmemleak_free_part(__va(physaddr), size);
+       memblock_x86_free_range(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)
+{
+       kmemleak_free_part(__va(addr), size);
+       memblock_x86_free_range(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)
+{
+       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_memory_core_early(MAX_NUMNODES, 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)
+{
+       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, ARCH_LOW_ADDRESS_LIMIT);
+       if (ptr)
+               return ptr;
+
+       return  __alloc_memory_core_early(MAX_NUMNODES, size, align,
+                               goal, ARCH_LOW_ADDRESS_LIMIT);
+}