[PATCH] [4/4] x86: MCE: Fix EIPV behaviour with !PCC

Andi Kleen
2009-04-07T15:08:00Z

From: Huang Ying <ying.huang@intel.com>

Impact: Spec compliance

When tolerant == 0, system should go panic instead of send SIGBUS even
for a MCE with EPIV && !PCC on user space.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

---
arch/x86/kernel/cpu/mcheck/mce_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/arch/x86/kernel/cpu/mcheck/mce_64.c
===================================================================
--- linux.orig/arch/x86/kernel/cpu/mcheck/mce_64.c 2009-04-07 16:09:59.000000000 +0200
+++ linux/arch/x86/kernel/cpu/mcheck/mce_64.c 2009-04-07 16:43:14.000000000 +0200
@@ -401,7 +401,7 @@
* force_sig() takes an awful lot of locks and has a slight
* risk of deadlocking.
*/
- if (user_space) {
+ if (user_space && tolerant > 0) {
force_sig(SIGBUS, current);
} else if (panic_on_oops || tolerant < 2) {
mce_panic("Uncorrected machine check",