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functions are used to write page to vmcore. vmcore is written page by page. page desc is used to store the information of a page, including a page's size, offset, compression format, etc. Signed-off-by: Qiao Nuohan <qiaonuohan@cn.fujitsu.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>