mce: Panic when a core has reached a timeout

There is very little and maybe practically nothing we can do to recover
from a system where at least one core has reached a timeout during the
whole monarch cores gathering. So panic when that happens.

Link: http://lkml.kernel.org/r/20140523091041.GA21332@pd.tnic
Signed-off-by: Borislav Petkov <bp@suse.de>

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 0078761..6cc8003 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -704,8 +704,7 @@ static int mce_timed_out(u64 *t)
        if (!mca_cfg.monarch_timeout)
                goto out;
        if ((s64)*t < SPINUNIT) {
-               /* CHECKME: Make panic default for 1 too? */
-               if (mca_cfg.tolerant < 1)
+               if (mca_cfg.tolerant <= 1)
                        mce_panic("Timeout synchronizing machine check over CPUs",
                                  NULL, NULL);
                cpu_missing = 1;