[PATCH] Fix Athlon MCA

Kronos
2003-09-21T14:40:10Z

Hi,
on boot I'm seeing a lot of messages like this:

MCE: The hardware reports a non fatal, correctable incident occurred on CPU 0.
Bank 0: d47fa0000000bfee

This messages go away if I revert cset 1.1119.9.1. AFAIK you were trying
to decrease the logging level. After reading IA32 Architecture Software
Developers Manual, vol3 - chapter 14.5 "Machine-Check Initialization" I
think that the right way to do it is this:

--- linux-2.6/arch/i386/kernel/cpu/mcheck/k7.c~ Sat Aug 9 06:37:27 2003
+++ linux-2.6/arch/i386/kernel/cpu/mcheck/k7.c Sun Sep 21 00:36:39 2003
@@ -81,8 +81,9 @@
wrmsr (MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
nr_mce_banks = l & 0xff;

- for (i=1; i<nr_mce_banks; i++) {
- wrmsr (MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
+ for (i=0; i<nr_mce_banks; i++) {
+ if (i)
+ wrmsr (MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
wrmsr (MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
}

We really want to clean all MC*_STATUS. I'm currently running linux 2.6.0-t5
+ this patch and I don't see the MCE messages on boot anymore.

Luca
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