sparc64: fatal trap should stop all cpus

"echo c > /proc/sysrq-trigger" does not result in a system crash. There
are two problems. One is that the trap handler ignores the global
variable, panic_on_oops. The other is that smp_send_stop() is a no-op
which leaves the other cpus running normally when one cpu panics.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 26 insertions, 3 deletions

diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index da6f1a7fc4db..61139d9924ca 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -1406,11 +1406,32 @@ void __irq_entry smp_receive_signal_client(int irq, struct pt_regs *regs)
         scheduler_ipi();
 }
 
-/* This is a nop because we capture all other cpus
- * anyways when making the PROM active.
- */
+static void stop_this_cpu(void *dummy)
+{
+        prom_stopself();
+}
+
 void smp_send_stop(void)
 {
+        int cpu;
+
+        if (tlb_type == hypervisor) {
+                for_each_online_cpu(cpu) {
+                        if (cpu == smp_processor_id())
+                                continue;
+#ifdef CONFIG_SUN_LDOMS
+                        if (ldom_domaining_enabled) {
+                                unsigned long hv_err;
+                                hv_err = sun4v_cpu_stop(cpu);
+                                if (hv_err)
+                                        printk(KERN_ERR "sun4v_cpu_stop() "
+                                               "failed err=%lu\n", hv_err);
+                        } else
+#endif
+                                prom_stopcpu_cpuid(cpu);
+                }
+        } else
+                smp_call_function(stop_this_cpu, NULL, 0);
 }
 
 /**
diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
index 1ef1af4cf96b..0e699745d643 100644
--- a/arch/sparc/kernel/traps_64.c
+++ b/arch/sparc/kernel/traps_64.c
@@ -2427,6 +2427,8 @@ void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
                 }
                 user_instruction_dump ((unsigned int __user *) regs->tpc);
         }
+        if (panic_on_oops)
+                panic("Fatal exception");
         if (regs->tstate & TSTATE_PRIV)
                 do_exit(SIGKILL);
         do_exit(SIGSEGV);