[PATCH] i386: Enable bank 0 on non K7 Athlon

As a bug workaround bank 0 on K7s is normally disabled, but no need
to do that on other AMD CPUs.

Cc: davej@redhat.com

Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 7 insertions, 3 deletions

diff --git a/arch/i386/kernel/cpu/mcheck/k7.c b/arch/i386/kernel/cpu/mcheck/k7.c
index b0862af595aa..7a2472557bbb 100644
--- a/arch/i386/kernel/cpu/mcheck/k7.c
+++ b/arch/i386/kernel/cpu/mcheck/k7.c
@@ -82,9 +82,13 @@ void amd_mcheck_init(struct cpuinfo_x86 *c)
         nr_mce_banks = l & 0xff;
 
         /* Clear status for MC index 0 separately, we don't touch CTL,
-         * as some Athlons cause spurious MCEs when its enabled. */
-        wrmsr (MSR_IA32_MC0_STATUS, 0x0, 0x0);
-        for (i=1; i<nr_mce_banks; i++) {
+         * as some K7 Athlons cause spurious MCEs when its enabled. */
+        if (boot_cpu_data.x86 == 6) {
+                wrmsr (MSR_IA32_MC0_STATUS, 0x0, 0x0);
+                i = 1;
+        } else
+                i = 0;
+        for (; i<nr_mce_banks; i++) {
                 wrmsr (MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
                 wrmsr (MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
         }