c132937556
Impact: cleaner and consistent bootmem wrapping By setting CONFIG_HAVE_ARCH_BOOTMEM_NODE, archs can define arch-specific wrappers for bootmem allocation. However, this is done a bit strangely in that only the high level convenience macros can be changed while lower level, but still exported, interface functions can't be wrapped. This not only is messy but also leads to strange situation where alloc_bootmem() does what the arch wants it to do but the equivalent __alloc_bootmem() call doesn't although they should be able to be used interchangeably. This patch updates bootmem such that archs can override / wrap the backend function - alloc_bootmem_core() instead of the highlevel interface functions to allow simpler and consistent wrapping. Also, HAVE_ARCH_BOOTMEM_NODE is renamed to HAVE_ARCH_BOOTMEM. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Johannes Weiner <hannes@saeurebad.de>
156 lines
4.6 KiB
C
156 lines
4.6 KiB
C
/*
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* Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999
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*/
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#ifndef _LINUX_BOOTMEM_H
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#define _LINUX_BOOTMEM_H
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#include <linux/mmzone.h>
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#include <asm/dma.h>
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/*
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* simple boot-time physical memory area allocator.
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*/
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extern unsigned long max_low_pfn;
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extern unsigned long min_low_pfn;
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/*
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* highest page
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*/
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extern unsigned long max_pfn;
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#ifdef CONFIG_CRASH_DUMP
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extern unsigned long saved_max_pfn;
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#endif
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/*
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* node_bootmem_map is a map pointer - the bits represent all physical
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* memory pages (including holes) on the node.
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*/
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typedef struct bootmem_data {
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unsigned long node_min_pfn;
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unsigned long node_low_pfn;
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void *node_bootmem_map;
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unsigned long last_end_off;
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unsigned long hint_idx;
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struct list_head list;
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} bootmem_data_t;
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extern bootmem_data_t bootmem_node_data[];
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extern unsigned long bootmem_bootmap_pages(unsigned long);
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extern unsigned long init_bootmem_node(pg_data_t *pgdat,
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unsigned long freepfn,
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unsigned long startpfn,
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unsigned long endpfn);
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extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
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extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
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extern unsigned long free_all_bootmem(void);
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extern void free_bootmem_node(pg_data_t *pgdat,
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unsigned long addr,
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unsigned long size);
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extern void free_bootmem(unsigned long addr, unsigned long size);
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/*
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* Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
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* the architecture-specific code should honor this).
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*
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* If flags is 0, then the return value is always 0 (success). If
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* flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
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* memory already was reserved.
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*/
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#define BOOTMEM_DEFAULT 0
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#define BOOTMEM_EXCLUSIVE (1<<0)
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extern int reserve_bootmem_node(pg_data_t *pgdat,
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unsigned long physaddr,
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unsigned long size,
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int flags);
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extern int reserve_bootmem(unsigned long addr,
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unsigned long size,
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int flags);
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extern void *__alloc_bootmem_nopanic(unsigned long size,
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unsigned long align,
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unsigned long goal);
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extern void *__alloc_bootmem(unsigned long size,
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unsigned long align,
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unsigned long goal);
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extern void *__alloc_bootmem_low(unsigned long size,
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unsigned long align,
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unsigned long goal);
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extern void *__alloc_bootmem_node(pg_data_t *pgdat,
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unsigned long size,
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unsigned long align,
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unsigned long goal);
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extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
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unsigned long size,
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unsigned long align,
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unsigned long goal);
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extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
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unsigned long size,
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unsigned long align,
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unsigned long goal);
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#define alloc_bootmem(x) \
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__alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_nopanic(x) \
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__alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_low(x) \
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__alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
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#define alloc_bootmem_pages(x) \
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__alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_pages_nopanic(x) \
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__alloc_bootmem_nopanic(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_low_pages(x) \
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__alloc_bootmem_low(x, PAGE_SIZE, 0)
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#define alloc_bootmem_node(pgdat, x) \
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__alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_pages_node(pgdat, x) \
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__alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_low_pages_node(pgdat, x) \
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__alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
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extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
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int flags);
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extern void *alloc_bootmem_section(unsigned long size,
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unsigned long section_nr);
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#ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
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extern void *alloc_remap(int nid, unsigned long size);
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#else
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static inline void *alloc_remap(int nid, unsigned long size)
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{
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return NULL;
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}
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#endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
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extern unsigned long __meminitdata nr_kernel_pages;
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extern unsigned long __meminitdata nr_all_pages;
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extern void *alloc_large_system_hash(const char *tablename,
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unsigned long bucketsize,
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unsigned long numentries,
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int scale,
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int flags,
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unsigned int *_hash_shift,
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unsigned int *_hash_mask,
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unsigned long limit);
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#define HASH_EARLY 0x00000001 /* Allocating during early boot? */
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/* Only NUMA needs hash distribution.
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* IA64 and x86_64 have sufficient vmalloc space.
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*/
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#if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64))
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#define HASHDIST_DEFAULT 1
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#else
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#define HASHDIST_DEFAULT 0
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#endif
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extern int hashdist; /* Distribute hashes across NUMA nodes? */
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#endif /* _LINUX_BOOTMEM_H */
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