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Re: [Xen-devel] question about page_to_phys
| To: | Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] question about page_to_phys |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 1 Sep 2005 10:07:46 +0100 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Thu, 01 Sep 2005 09:01:08 +0000 |
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On 1 Sep 2005, at 02:29, Xiaofeng Ling wrote: The page_to_phys is defined as#define page_to_phys(page) (phys_to_machine(page_to_pseudophys(page)))so it return machine addresss while virt_to_phys return psedophys. include/asm-xen/asm-i386/io.h this is really confusing. why not define page_to_machine? page_to_phys() is used only in places where we want to compare machine addresses (e.g., in deciding when to merge I/O requests). It was easier to abuse the macro definition than fix every place that it is used. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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