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xen-devel
RE: [Xen-ia64-devel] RE: [Xen-devel] RE: Linux PG_arch_1 conflict
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To: |
"Isaku Yamahata" <yamahata@xxxxxxxxxxxxx> |
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Subject: |
RE: [Xen-ia64-devel] RE: [Xen-devel] RE: Linux PG_arch_1 conflict |
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From: |
"Tian, Kevin" <kevin.tian@xxxxxxxxx> |
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Date: |
Tue, 14 Mar 2006 12:46:08 +0800 |
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Cc: |
"Magenheimer, Dan \(HP Labs Fort Collins\)" <dan.magenheimer@xxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, xen-ppc-devel@xxxxxxxxxxxxxxxxxxx, Hollis Blanchard <hollisb@xxxxxxxxxx>, xen-ia64-devel@xxxxxxxxxxxxxxxxxxx |
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Tue, 14 Mar 2006 04:47:18 +0000 |
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AcZHIf9lI2gbxGXtT2+MGZNMH6u4twAAB03A |
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Thread-topic: |
[Xen-ia64-devel] RE: [Xen-devel] RE: Linux PG_arch_1 conflict |
>From: Isaku Yamahata
>Sent: 2006年3月14日 12:43
>> >
>> >What do you think of the followings? Too hacky?
>> >
>> >
>> >extern struct address_space xen_ia64_foreign_dummy_mapping;
>> >#define PageForeign(page) \
>> > (page->mapping == &xen_ia64_foreign_dummy_mapping)
>> >
>> >#define SetPageForeign(page, dtor) do { \
>> > set_page_private((page), (unsigned long)dtor); \
>> > (page)->mapping = &xen_ia64_foreign_dummy_mapping; \
>> >} while (0)
>> >
>> >#define ClearPageForeign(page) do { \
>> > (page)->mapping = NULL; \
>> > set_page_private((page), 0); \
>> >} while (0)
>> >
>> >#define PageForeignDestructor(page) \
>> > ( (void (*) (struct page *)) page_private((page)) )
>> >
>>
>> Hi, Isaku,
>> (page)->mapping is used to keep special destructor since that
>foreign page needs to be freed differently as normal linux pages, as you
>see in foreign_page.h. Your hack only ensures the check. Agree right
>way to go to propose PG_foreign upstream.
>
>A special destructor is kept in page->private by set_page_private() and
>get by page_private(). page->private is unsigned long so that it can
>hold pointer value.
>
>They are just defined as
>#define page_private(page) ((page)->private)
>#define set_page_private(page, v) ((page)->private = (v))
Oops, I didn't note that. :-)
Thanks,
Kevin
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