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4e1c2b2844
The comments above __alloc_bootmem_node() claim that the code will first try the allocation using 'goal' and if that fails it will try again but with the 'goal' requirement dropped. Unfortunately, this is not what the code does, so fix it to do so. This is important for nobootmem conversions to architectures such as sparc where MAX_DMA_ADDRESS is infinity. On such architectures all of the allocations done by generic spots, such as the sparse-vmemmap implementation, will pass in: __pa(MAX_DMA_ADDRESS) as the goal, and with the limit given as "-1" this will always fail unless we add the appropriate fallback logic here. Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
414 lines
11 KiB
C
414 lines
11 KiB
C
/*
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* bootmem - A boot-time physical memory allocator and configurator
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*
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* Copyright (C) 1999 Ingo Molnar
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* 1999 Kanoj Sarcar, SGI
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* 2008 Johannes Weiner
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*
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* Access to this subsystem has to be serialized externally (which is true
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* for the boot process anyway).
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*/
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#include <linux/init.h>
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#include <linux/pfn.h>
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#include <linux/slab.h>
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#include <linux/bootmem.h>
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#include <linux/export.h>
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#include <linux/kmemleak.h>
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#include <linux/range.h>
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#include <linux/memblock.h>
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#include <asm/bug.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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#include "internal.h"
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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struct pglist_data __refdata contig_page_data;
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EXPORT_SYMBOL(contig_page_data);
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#endif
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unsigned long max_low_pfn;
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unsigned long min_low_pfn;
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unsigned long max_pfn;
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static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
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u64 goal, u64 limit)
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{
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void *ptr;
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u64 addr;
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if (limit > memblock.current_limit)
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limit = memblock.current_limit;
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addr = memblock_find_in_range_node(goal, limit, size, align, nid);
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if (!addr)
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return NULL;
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ptr = phys_to_virt(addr);
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memset(ptr, 0, size);
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memblock_reserve(addr, size);
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/*
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* The min_count is set to 0 so that bootmem allocated blocks
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* are never reported as leaks.
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*/
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kmemleak_alloc(ptr, size, 0, 0);
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return ptr;
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}
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/*
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* free_bootmem_late - free bootmem pages directly to page allocator
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* @addr: starting address of the range
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* @size: size of the range in bytes
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*
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* This is only useful when the bootmem allocator has already been torn
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* down, but we are still initializing the system. Pages are given directly
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* to the page allocator, no bootmem metadata is updated because it is gone.
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*/
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void __init free_bootmem_late(unsigned long addr, unsigned long size)
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{
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unsigned long cursor, end;
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kmemleak_free_part(__va(addr), size);
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cursor = PFN_UP(addr);
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end = PFN_DOWN(addr + size);
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for (; cursor < end; cursor++) {
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__free_pages_bootmem(pfn_to_page(cursor), 0);
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totalram_pages++;
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}
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}
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static void __init __free_pages_memory(unsigned long start, unsigned long end)
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{
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int i;
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unsigned long start_aligned, end_aligned;
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int order = ilog2(BITS_PER_LONG);
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start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
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end_aligned = end & ~(BITS_PER_LONG - 1);
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if (end_aligned <= start_aligned) {
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for (i = start; i < end; i++)
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__free_pages_bootmem(pfn_to_page(i), 0);
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return;
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}
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for (i = start; i < start_aligned; i++)
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__free_pages_bootmem(pfn_to_page(i), 0);
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for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
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__free_pages_bootmem(pfn_to_page(i), order);
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for (i = end_aligned; i < end; i++)
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__free_pages_bootmem(pfn_to_page(i), 0);
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}
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unsigned long __init free_low_memory_core_early(int nodeid)
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{
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unsigned long count = 0;
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phys_addr_t start, end;
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u64 i;
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/* free reserved array temporarily so that it's treated as free area */
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memblock_free_reserved_regions();
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for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) {
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unsigned long start_pfn = PFN_UP(start);
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unsigned long end_pfn = min_t(unsigned long,
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PFN_DOWN(end), max_low_pfn);
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if (start_pfn < end_pfn) {
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__free_pages_memory(start_pfn, end_pfn);
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count += end_pfn - start_pfn;
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}
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}
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/* put region array back? */
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memblock_reserve_reserved_regions();
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return count;
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}
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/**
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* free_all_bootmem_node - release a node's free pages to the buddy allocator
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* @pgdat: node to be released
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*
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* Returns the number of pages actually released.
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*/
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unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
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{
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register_page_bootmem_info_node(pgdat);
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/* free_low_memory_core_early(MAX_NUMNODES) will be called later */
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return 0;
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}
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/**
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* free_all_bootmem - release free pages to the buddy allocator
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*
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* Returns the number of pages actually released.
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*/
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unsigned long __init free_all_bootmem(void)
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{
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/*
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* We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
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* because in some case like Node0 doesn't have RAM installed
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* low ram will be on Node1
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* Use MAX_NUMNODES will make sure all ranges in early_node_map[]
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* will be used instead of only Node0 related
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*/
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return free_low_memory_core_early(MAX_NUMNODES);
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}
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/**
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* free_bootmem_node - mark a page range as usable
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* @pgdat: node the range resides on
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* @physaddr: starting address of the range
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* @size: size of the range in bytes
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*
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* Partial pages will be considered reserved and left as they are.
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*
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* The range must reside completely on the specified node.
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*/
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void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
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unsigned long size)
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{
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kmemleak_free_part(__va(physaddr), size);
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memblock_free(physaddr, size);
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}
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/**
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* free_bootmem - mark a page range as usable
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* @addr: starting address of the range
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* @size: size of the range in bytes
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*
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* Partial pages will be considered reserved and left as they are.
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*
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* The range must be contiguous but may span node boundaries.
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*/
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void __init free_bootmem(unsigned long addr, unsigned long size)
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{
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kmemleak_free_part(__va(addr), size);
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memblock_free(addr, size);
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}
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static void * __init ___alloc_bootmem_nopanic(unsigned long size,
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unsigned long align,
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unsigned long goal,
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unsigned long limit)
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{
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void *ptr;
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if (WARN_ON_ONCE(slab_is_available()))
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return kzalloc(size, GFP_NOWAIT);
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restart:
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ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
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if (ptr)
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return ptr;
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if (goal != 0) {
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goal = 0;
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goto restart;
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}
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return NULL;
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}
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/**
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* __alloc_bootmem_nopanic - allocate boot memory without panicking
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* @size: size of the request in bytes
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* @align: alignment of the region
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* @goal: preferred starting address of the region
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*
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* The goal is dropped if it can not be satisfied and the allocation will
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* fall back to memory below @goal.
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*
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* Allocation may happen on any node in the system.
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*
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* Returns NULL on failure.
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*/
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void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
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unsigned long goal)
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{
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unsigned long limit = -1UL;
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return ___alloc_bootmem_nopanic(size, align, goal, limit);
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}
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static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
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unsigned long goal, unsigned long limit)
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{
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void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
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if (mem)
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return mem;
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/*
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* Whoops, we cannot satisfy the allocation request.
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*/
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printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
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panic("Out of memory");
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return NULL;
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}
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/**
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* __alloc_bootmem - allocate boot memory
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* @size: size of the request in bytes
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* @align: alignment of the region
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* @goal: preferred starting address of the region
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*
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* The goal is dropped if it can not be satisfied and the allocation will
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* fall back to memory below @goal.
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*
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* Allocation may happen on any node in the system.
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*
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* The function panics if the request can not be satisfied.
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*/
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void * __init __alloc_bootmem(unsigned long size, unsigned long align,
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unsigned long goal)
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{
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unsigned long limit = -1UL;
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return ___alloc_bootmem(size, align, goal, limit);
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}
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/**
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* __alloc_bootmem_node - allocate boot memory from a specific node
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* @pgdat: node to allocate from
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* @size: size of the request in bytes
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* @align: alignment of the region
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* @goal: preferred starting address of the region
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*
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* The goal is dropped if it can not be satisfied and the allocation will
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* fall back to memory below @goal.
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*
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* Allocation may fall back to any node in the system if the specified node
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* can not hold the requested memory.
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*
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* The function panics if the request can not be satisfied.
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*/
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void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
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unsigned long align, unsigned long goal)
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{
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void *ptr;
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if (WARN_ON_ONCE(slab_is_available()))
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return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
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again:
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ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
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goal, -1ULL);
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if (ptr)
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return ptr;
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ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
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goal, -1ULL);
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if (!ptr && goal) {
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goal = 0;
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goto again;
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}
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return ptr;
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}
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void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
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unsigned long align, unsigned long goal)
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{
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return __alloc_bootmem_node(pgdat, size, align, goal);
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}
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#ifdef CONFIG_SPARSEMEM
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/**
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* alloc_bootmem_section - allocate boot memory from a specific section
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* @size: size of the request in bytes
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* @section_nr: sparse map section to allocate from
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*
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* Return NULL on failure.
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*/
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void * __init alloc_bootmem_section(unsigned long size,
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unsigned long section_nr)
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{
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unsigned long pfn, goal, limit;
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pfn = section_nr_to_pfn(section_nr);
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goal = pfn << PAGE_SHIFT;
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limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
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return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
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SMP_CACHE_BYTES, goal, limit);
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}
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#endif
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void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
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unsigned long align, unsigned long goal)
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{
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void *ptr;
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if (WARN_ON_ONCE(slab_is_available()))
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return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
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ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
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goal, -1ULL);
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if (ptr)
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return ptr;
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return __alloc_bootmem_nopanic(size, align, goal);
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}
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#ifndef ARCH_LOW_ADDRESS_LIMIT
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#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
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#endif
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/**
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* __alloc_bootmem_low - allocate low boot memory
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* @size: size of the request in bytes
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* @align: alignment of the region
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* @goal: preferred starting address of the region
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*
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* The goal is dropped if it can not be satisfied and the allocation will
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* fall back to memory below @goal.
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*
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* Allocation may happen on any node in the system.
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*
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* The function panics if the request can not be satisfied.
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*/
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void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
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unsigned long goal)
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{
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return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
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}
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/**
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* __alloc_bootmem_low_node - allocate low boot memory from a specific node
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* @pgdat: node to allocate from
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* @size: size of the request in bytes
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* @align: alignment of the region
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* @goal: preferred starting address of the region
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*
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* The goal is dropped if it can not be satisfied and the allocation will
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* fall back to memory below @goal.
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*
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* Allocation may fall back to any node in the system if the specified node
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* can not hold the requested memory.
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*
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* The function panics if the request can not be satisfied.
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*/
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void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
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unsigned long align, unsigned long goal)
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{
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void *ptr;
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if (WARN_ON_ONCE(slab_is_available()))
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return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
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ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
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goal, ARCH_LOW_ADDRESS_LIMIT);
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if (ptr)
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return ptr;
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return __alloc_memory_core_early(MAX_NUMNODES, size, align,
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goal, ARCH_LOW_ADDRESS_LIMIT);
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}
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