tree e8cfbf2cfd2a0617bb3a24d8851b2cde1eee2709
parent 24bdb0b62cc82120924762ae6bc85afc8c3f2b26
author Stefano Stabellini <stefano.stabellini@eu.citrix.com> 1303220851 +0100
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1303306993 -0400

xen: mask_rw_pte: do not apply the early_ioremap checks on x86_32

The two "is_early_ioremap_ptep" checks in mask_rw_pte are only used on
x86_64, in fact early_ioremap is not used at all to setup the initial
pagetable on x86_32.
Moreover on x86_32 the two checks are wrong because the range
pgt_buf_start..pgt_buf_end initially should be mapped RW because
the pages in the range are not pagetable pages yet and haven't been
cleared yet. Afterwards considering the pgt_buf_start..pgt_buf_end is
part of the initial mapping, xen_alloc_pte is capable of turning
the ptes RO when they become pagetable pages.

Fix the issue and improve the readability of the code providing two
different implementation of mask_rw_pte for x86_32 and x86_64.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>