Re: [RFC] Split up mm/bootmem.c
From: Yinghai Lu
Date: Mon Feb 07 2011 - 13:45:30 EST
On Mon, Feb 7, 2011 at 7:30 AM, Namhyung Kim <namhyung@xxxxxxxxx> wrote:
> The bootmem code contained many #ifdefs in it so that it could be
> splitted into two files for the readability. The split was quite
> mechanical and only function need to be shared was free_bootmem_late.
>
> Tested on x86-64 and um which use nobootmem and bootmem respectively.
>
> Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxx>
https://lkml.org/lkml/2010/6/16/44
...
> ---
> mm/Makefile | 8 +-
> mm/bootmem.c | 164 +--------------------
> mm/nobootmem.c | 445 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 454 insertions(+), 163 deletions(-)
> create mode 100644 mm/nobootmem.c
>
> diff --git a/mm/Makefile b/mm/Makefile
> index 2b1b575ae712..e9a074dbad15 100644
> --- a/mm/Makefile
> +++ b/mm/Makefile
> @@ -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 \
> $(mmu-y)
> obj-y += init-mm.o
>
> +ifeq ($(CONFIG_NO_BOOTMEM),y)
> +obj-y += nobootmem.o
> +else
> +obj-y += bootmem.o
> +endif
> +
> obj-$(CONFIG_HAVE_MEMBLOCK) += memblock.o
>
> obj-$(CONFIG_BOUNCE) += bounce.o
> diff --git a/mm/bootmem.c b/mm/bootmem.c
> index 13b0caa9793c..209be265ad94 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);
> @@ -146,8 +145,8 @@ 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
> * @size: size of the range in bytes
> @@ -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
> @@ -847,17 +727,7 @@ 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
> - 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;
> }
> @@ -880,13 +750,8 @@ 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 +772,6 @@ 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 +781,6 @@ 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 +792,11 @@ 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;
>
> @@ -1000,16 +849,7 @@ 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
> - ptr = __alloc_memory_core_early(pgdat->node_id, 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
> index 000000000000..e93c3475011b
> --- /dev/null
> +++ b/mm/nobootmem.c
> @@ -0,0 +1,445 @@
> +/*
> + * nobootmem - A boot-time physical memory allocator and configurator
> + *
> + * Copyright (C) 1999 Ingo Molnar
> + * 1999 Kanoj Sarcar, SGI
> + * 2008 Johannes Weiner
> + *
> + * Split out of bootmem.c by Namhyung Kim <namhyung@xxxxxxxxx>
> + *
> + * 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);
> +}
> +
> +/**
> + * 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)
> +{
> + panic("no bootmem");
> + return 0;
> +}
> +
> +/**
> + * reserve_bootmem - mark a page range as usable
> + * @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)
> +{
> + panic("no bootmem");
> + return 0;
> +}
> +
> +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;
> +
> + ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
> + goal, -1ULL);
> +
> + return ptr;
> +}
> +
> +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;
> +
> + ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
> + goal, ARCH_LOW_ADDRESS_LIMIT);
> + return ptr;
> +}
> --
> 1.7.3.4.600.g982838b0
>
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