mm: enhance region_is_ram() to region_intersects()

region_is_ram() is used to prevent the establishment of aliased mappings
to physical "System RAM" with incompatible cache settings.  However, it
uses "-1" to indicate both "unknown" memory ranges (ranges not described
by platform firmware) and "mixed" ranges (where the parameters describe
a range that partially overlaps "System RAM").

Fix this up by explicitly tracking the "unknown" vs "mixed" resource
cases and returning REGION_INTERSECTS, REGION_MIXED, or REGION_DISJOINT.
This re-write also adds support for detecting when the requested region
completely eclipses all of a resource.  Note, the implementation treats
overlaps between "unknown" and the requested memory type as
REGION_INTERSECTS.

Finally, other memory types can be passed in by name, for now the only
usage "System RAM".

Suggested-by: Luis R. Rodriguez <mcgrof@suse.com>
Reviewed-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

path: root/debian/control

Source: acpitail
Section: utils
Priority: optional
Maintainer: Debian Acpi Team <pkg-acpi-devel@lists.alioth.debian.org>
Uploaders: Tobias Klauser <tklauser@distanz.ch>
Build-Depends: debhelper (>= 7), libacpi-dev
Standards-Version: 3.8.0
Homepage: http://www.vanheusden.com/acpitail/
Vcs-Git: git://git.debian.org/git/pkg-acpi/acpitail.git
Vcs-Browser: http://git.debian.org/?p=pkg-acpi/acpitail.git

Package: acpitail
Architecture: i386 amd64 ia64
Depends: ${shlibs:Depends}
Description:  Show ACPI information in a tail-like style
 acpitail shows ACPI status information about battery, fan and
 temperature in a tail-like way. As soon as a value changes, the new
 value gets appended to the current output.