Commit-ID: c7f6fa44115d401e89db730f357629d39f8e4ba6
Gitweb: http://git.kernel.org/tip/c7f6fa44115d401e89db730f357629d39f8e4ba6
Author: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
AuthorDate: Tue, 28 Jul 2009 23:52:54 +0200
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Mon, 17 Aug 2009 10:17:02 +0200
x86, mce: don't log boot MCEs on Pentium M (model == 13) CPUs
On my legacy Pentium M laptop (Acer Extensa 2900) I get bogus MCE on a cold
boot with CONFIG_X86_NEW_MCE enabled, i.e. (after decoding it with mcelog):
MCE 0
HARDWARE ERROR. This is *NOT* a software problem!
Please contact your hardware vendor
CPU 0 BANK 1 MCG status:
MCi status:
Error overflow
Uncorrected error
Error enabled
Processor context corrupt
MCA: Data CACHE Level-1 UNKNOWN Error
STATUS f200000000000195 MCGSTATUS 0
[ The other STATUS values observed: f2000000000001b5 (... UNKNOWN error)
and f200000000000115 (... READ Error).
To verify that this is not a CONFIG_X86_NEW_MCE bug I also modified
the CONFIG_X86_OLD_MCE code (which doesn't log any MCEs) to dump
content of STATUS MSR before it is cleared during initialization. ]
Since the bogus MCE results in a kernel taint (which in turn disables
lockdep support) don't log boot MCEs on Pentium M (model == 13) CPUs
by default ("mce=bootlog" boot parameter can be be used to get the old
behavior).
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
Reviewed-by: Andi Kleen <andi@xxxxxxxxxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/kernel/cpu/mcheck/mce.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 1cfb623..a0c2910 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1273,6 +1273,10 @@ static void mce_cpu_quirks(struct cpuinfo_x86 *c)
if ((c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xe)) &&
monarch_timeout < 0)
monarch_timeout = USEC_PER_SEC;
+
+ /* There are also broken BIOSes on some Pentium M systems. */
+ if (c->x86 == 6 && c->x86_model == 13 && mce_bootlog < 0)
+ mce_bootlog = 0;
}
if (monarch_timeout < 0)
monarch_timeout = 0;
--
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