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[Xen-devel] PG_blkback handling issue?

This flag, introduced with blktap2, seems to be sticky when blktap2 isn't
actively involved in any operations, since blkback-pagemap.c is only ever
setting or testing this bit. Shouldn't blkback_pagemap_clear() clear it?

And it would seem to me that, for safety purposes, both PG_blkback and
PG_netback should be included in the checks in mm/page_alloc.c which
already look at PG_foreign and (for ix86) PG_pinned.

Thanks, Jan

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