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72a7fe3967
This patchset adds a flags variable to reserve_bootmem() and uses the BOOTMEM_EXCLUSIVE flag in crashkernel reservation code to detect collisions between crashkernel area and already used memory. This patch: Change the reserve_bootmem() function to accept a new flag BOOTMEM_EXCLUSIVE. If that flag is set, the function returns with -EBUSY if the memory already has been reserved in the past. This is to avoid conflicts. Because that code runs before SMP initialisation, there's no race condition inside reserve_bootmem_core(). [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix powerpc build] Signed-off-by: Bernhard Walle <bwalle@suse.de> Cc: <linux-arch@vger.kernel.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
149 lines
4.5 KiB
C
149 lines
4.5 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_boot_start;
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unsigned long node_low_pfn;
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void *node_bootmem_map;
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unsigned long last_offset;
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unsigned long last_pos;
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unsigned long last_success; /* Previous allocation point. To speed
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* up searching */
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struct list_head list;
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} bootmem_data_t;
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extern unsigned long bootmem_bootmap_pages(unsigned long);
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extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
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extern void free_bootmem(unsigned long addr, unsigned long size);
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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_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_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_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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extern void *__alloc_bootmem_core(struct bootmem_data *bdata,
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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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unsigned long limit);
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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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#define BOOTMEM_DEFAULT 0
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#define BOOTMEM_EXCLUSIVE (1<<0)
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#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
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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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extern int reserve_bootmem(unsigned long addr, unsigned long size, int flags);
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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_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_low_pages(x) \
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__alloc_bootmem_low(x, PAGE_SIZE, 0)
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#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
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extern unsigned long free_all_bootmem(void);
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extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
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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 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 void 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 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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#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
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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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#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
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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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