http://bugzilla.kernel.org/show_bug.cgi?id=14445
Summary: Info: mapping multiple BARs. Your kernel is fine.
Product: ACPI
Version: 2.5
Kernel Version: 2.6.28 - 2.6.31
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ACPICA-Core
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected],
[email protected]
Regression: No
acpi_ex_system_memory_space_handler() is implemented
to round up mapping requests to ACPI_SYSMEM_REGION_WINDOW_SIZE.
However, sometimes this overlaps with other mappings.
At least in one case, this is because doing mappings of this
size crosses a page boundary.
http://lkml.org/lkml/2008/12/30/128
In Linux 2.6.28 a check was added to see if overlapping
mapping requests with different properties are made,
and various AML requests have been triggering Linux
warnings ever since:
http://kerneloops.org/searchweek.php?search=acpi_os_map_memory
The fix for this problem is likely to round up the mapping
request to a page boundary, but to not cross a page boundary.
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