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author | Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> | 2009-08-26 16:20:36 +0900 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-08-26 20:21:11 +0200 |
commit | 680b6cfd3cee30a7d997d49430fb73af84523853 (patch) | |
tree | b1ba1c3acb3611fc84aaaa5d5216a64db3b6a06e /kernel/trace | |
parent | bf783f9f7d33576815bc89f9f1856a7309ea2f17 (diff) | |
download | linux-680b6cfd3cee30a7d997d49430fb73af84523853.tar.bz2 |
x86, mce: CE in last bank prevents panic by unknown MCE
If MCE handler is called but none of mces_seen have machine
check event which might signal the MCE (i.e. event higher than
MCE_KEEP_SEVERITY), panic with "Machine check from unknown
source" will be taken since the MCE is assumed to be signaled
from external agent or so.
Usually mces_seen never point MCE_KEEP_SEVERITY event such as
CE. But it can happen because initial value of mces_seen is
accidentally modified by mce_no_way_out() - in case if
mce_no_way_out() run through all banks and the last bank has
the CE, mces_seen points the CE and the "panic by unknown" will
not be taken.
This patch fixes this undesired behavior, and clarifies the logic.
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Dongming <jin.dongming@np.css.fujitsu.com>
LKML-Reference: <4A94E244.3020301@jp.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Reported-by: Jin Dongming <jin.dongming@np.css.fujitsu.com>
Diffstat (limited to 'kernel/trace')
0 files changed, 0 insertions, 0 deletions