[Xen-devel] PG_arch_1

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

Xenlinux uses a special architecture-dependent bit in the page table,
called PG_arch_1 to indicate that a page is "foreign" (PG_foreign).
It also apparently uses it to determine if a page is pinned (PG_pinned).

Linux/ia64 (and apparently Linux/ppc and Linux/ppc64) use the PG_arch_1
bit for other purposes.  On Linux/ia64, it is used to determine if
the instruction cache needs to be flushed (e.g. if writing data
into code pages).

Any thought on this apparent conflict?

Thanks,
Dan

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