[IA64] Proper handling of TLB errors from duplicate itr.d dropins

Jack Steiner noticed that duplicate TLB DTC entries do not cause a
linux panic.  See discussion:

http://www.gelato.unsw.edu.au/archives/linux-ia64/0307/6108.html

The current TLB recovery code is recovering from the duplicate itr.d
dropins, masking the underlying problem.  This change modifies
the MCA recovery code to look for the TLB check signature of the
duplicate TLB entry and panic in that case.

Signed-off-by: Russ Anderson (rja@sgi.com)
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index a76add3e76a2..491687f84fb5 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -1192,8 +1192,6 @@ void
 ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
                  struct ia64_sal_os_state *sos)
 {
-        pal_processor_state_info_t *psp = (pal_processor_state_info_t *)
-                &sos->proc_state_param;
         int recover, cpu = smp_processor_id();
         struct task_struct *previous_current;
         struct ia64_mca_notify_die nd =
@@ -1223,10 +1221,8 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
         /* Get the MCA error record and log it */
         ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA);
 
-        /* TLB error is only exist in this SAL error record */
-        recover = (psp->tc && !(psp->cc || psp->bc || psp->rc || psp->uc))
-        /* other error recovery */
-           || (ia64_mca_ucmc_extension
+        /* MCA error recovery */
+        recover = (ia64_mca_ucmc_extension
                 && ia64_mca_ucmc_extension(
                         IA64_LOG_CURR_BUFFER(SAL_INFO_TYPE_MCA),
                         sos));