While working on display protocol I found that there is no(?) common
???_PAGE_SIZE define I can use for both Xen and Linux kernel:
Xen defines XC_PAGE_SIZE which is also used in Linux user-space and
kernel has XEN_PAGE_SIZE, but no XC_PAGE_SIZE.
So, the question is which define should I use? Or just replace it with
some number, like fbif does:
#define XENFB_OUT_RING_SIZE 2048
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