tree 04a8f54abadf6a3c8afff3281b120108c4e33d45
parent f4f97b3ea90130520afb478cbc2918be2b6587b8
author Jeremy Fitzhardinge <jeremy@xensource.com> 1184722625 -0700
committer Jeremy Fitzhardinge <jeremy@goop.org> 1184773663 -0700

xen: ignore RW mapping of RO pages in pagetable_init

When setting up the initial pagetable, which includes mappings of all
low physical memory, ignore a mapping which tries to set the RW bit on
an RO pte.  An RO pte indicates a page which is part of the current
pagetable, and so it cannot be allowed to become RW.

Once xen_pagetable_setup_done is called, set_pte reverts to its normal
behaviour.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Acked-by: Chris Wright <chrisw@sous-sol.org>
Cc: ebiederm@xmission.com (Eric W. Biederman)