diff options
| author | Yinghai Lu <[email protected]> | 2011-12-21 17:45:17 -0800 |
|---|---|---|
| committer | H. Peter Anvin <[email protected]> | 2011-12-23 11:01:01 -0800 |
| commit | fb209bd891645bb87b9618b724f0b4928e0df3de (patch) | |
| tree | 3b59766238dfedbe9f2164048008f4bb2c18a54e /net/lapb/lapb_timer.c | |
| parent | a35fd28256e7736cc84af8931a16224f0bfaaf6c (diff) | |
x86, x2apic: Fallback to xapic when BIOS doesn't setup interrupt-remapping
On some of the recent Intel SNB platforms, by default bios is pre-enabling
x2apic mode in the cpu with out setting up interrupt-remapping.
This case was resulting in the kernel to panic as the cpu is already in
x2apic mode but the OS was not able to enable interrupt-remapping (which
is a pre-req for using x2apic capability).
On these platforms all the apic-ids are < 255 and the kernel can fallback to
xapic mode if the bios has not enabled interrupt-remapping (which is
mostly the case if the bios has not exported interrupt-remapping tables to the
OS).
Reported-by: Berck E. Nash <[email protected]>
Signed-off-by: Yinghai Lu <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Suresh Siddha <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
Diffstat (limited to 'net/lapb/lapb_timer.c')
0 files changed, 0 insertions, 0 deletions