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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2007-11-29 01:21:20 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-11-29 18:24:52 +0100 |
| commit | 2c80b01beae3db9f99a161ec216405dd694bc4c2 (patch) | |
| tree | aea1b56634dad1467eca5a53a81b6a08d7b619b5 /scripts/mkcompile_h | |
| parent | UML: build fix (diff) | |
| download | linux-2c80b01beae3db9f99a161ec216405dd694bc4c2.tar.xz linux-2c80b01beae3db9f99a161ec216405dd694bc4c2.zip | |
xen: mask _PAGE_PCD from ptes
_PAGE_PCD maps a page with caching disabled, which is typically used for
mapping harware registers. Xen never allows it to be set on a mapping, and
unprivileged guests never need it since they can't see the real underlying
hardware. However, some uncached mappings are made early when probing the
(non-existent) APIC, and its OK to mask off the PCD flag in these cases.
This became necessary because Xen started checking for this bit, rather
than silently masking it off.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/mkcompile_h')
0 files changed, 0 insertions, 0 deletions