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Message-ID: <4C7F4984.1060703@qq.com> Date: Thu, 02 Sep 2010 14:51:48 +0800 From: gaoqiang <834555262@...com> To: linux-kernel@...r.kernel.org Subject: dear list 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) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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