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https://github.com/edk2-porting/linux-next.git
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c5d712433f
Fix the __pfn_to_page(pfn) macro so that it doesn't evaluate its argument twice in the CONFIG_DISCONTIGMEM=y case, because 'pfn' may be a result of a funtion call having side effects. For example, the hibernation code applies pfn_to_page(pfn) to the result of a function returning the pfn corresponding to the next set bit in a bitmap and the current bit position is modified on each call. This leads to "interesting" failures for CONFIG_DISCONTIGMEM=y due to the current behavior of __pfn_to_page(pfn). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
#ifndef __ASM_MEMORY_MODEL_H
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#define __ASM_MEMORY_MODEL_H
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#ifndef __ASSEMBLY__
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#if defined(CONFIG_FLATMEM)
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#ifndef ARCH_PFN_OFFSET
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#define ARCH_PFN_OFFSET (0UL)
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#endif
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#elif defined(CONFIG_DISCONTIGMEM)
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#ifndef arch_pfn_to_nid
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#define arch_pfn_to_nid(pfn) pfn_to_nid(pfn)
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#endif
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#ifndef arch_local_page_offset
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#define arch_local_page_offset(pfn, nid) \
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((pfn) - NODE_DATA(nid)->node_start_pfn)
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#endif
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#endif /* CONFIG_DISCONTIGMEM */
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/*
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* supports 3 memory models.
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*/
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#if defined(CONFIG_FLATMEM)
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#define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET))
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#define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \
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ARCH_PFN_OFFSET)
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#elif defined(CONFIG_DISCONTIGMEM)
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#define __pfn_to_page(pfn) \
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({ unsigned long __pfn = (pfn); \
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unsigned long __nid = arch_pfn_to_nid(__pfn); \
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NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\
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})
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#define __page_to_pfn(pg) \
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({ struct page *__pg = (pg); \
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struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg)); \
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(unsigned long)(__pg - __pgdat->node_mem_map) + \
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__pgdat->node_start_pfn; \
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})
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#elif defined(CONFIG_SPARSEMEM_VMEMMAP)
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/* memmap is virtually contigious. */
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#define __pfn_to_page(pfn) (vmemmap + (pfn))
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#define __page_to_pfn(page) ((page) - vmemmap)
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#elif defined(CONFIG_SPARSEMEM)
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/*
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* Note: section's mem_map is encorded to reflect its start_pfn.
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* section[i].section_mem_map == mem_map's address - start_pfn;
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*/
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#define __page_to_pfn(pg) \
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({ struct page *__pg = (pg); \
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int __sec = page_to_section(__pg); \
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(unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \
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})
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#define __pfn_to_page(pfn) \
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({ unsigned long __pfn = (pfn); \
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struct mem_section *__sec = __pfn_to_section(__pfn); \
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__section_mem_map_addr(__sec) + __pfn; \
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})
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#endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */
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#ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE
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struct page;
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/* this is useful when inlined pfn_to_page is too big */
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extern struct page *pfn_to_page(unsigned long pfn);
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extern unsigned long page_to_pfn(struct page *page);
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#else
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#define page_to_pfn __page_to_pfn
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#define pfn_to_page __pfn_to_page
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#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */
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#endif /* __ASSEMBLY__ */
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#endif
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