dear list

[gaoqiang]

I'm a newbie and got some question when learning the linux kernel

about a macro:

page_to_pfn(pg)

I traced its definition,and finally got that:

#define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + 
ARCH_PFN_OFFSET)


why hot ((unsigned long)((page)-mem_map + ARCH_PFN_OFFSET)/sizeof 
(struct page)


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