Re: [PATCH 07/11] unpaged: COW on VM_UNPAGED

David S. Miller
2005-11-18T08:08:26Z

From: Hugh Dickins <hugh@veritas.com>
Date: Fri, 18 Nov 2005 08:02:02 +0000 (GMT)

> That code is necessary to reproduce the existing behaviour, which has
> always done COW on PageReserved mappings without complaint - if the
> vm_page_prot didn't already let you slip through without a WP fault.

And there is evidence today that this is really needed, at least
by vbetool.

Ok, we need COW on VM_UNPAGED. :)