sparc64: Normalize NMI watchdog logging and behavior.

Bring this code in line with the perf based generic NMI watchdog
in kernel/watchdog.c (which we should convert over to at some
point).

In particular, don't do anything super fancy when the watchdog
triggers, and specifically don't do a do_exit() which only makes
things worse.

Either panic(), or WARN().  The latter of which will do all of
the actions such as give us a stack backtrace.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 16 deletions

diff --git a/arch/sparc/kernel/nmi.c b/arch/sparc/kernel/nmi.c
index 6479256fd5a4..337094556916 100644
--- a/arch/sparc/kernel/nmi.c
+++ b/arch/sparc/kernel/nmi.c
@@ -68,27 +68,16 @@ EXPORT_SYMBOL(touch_nmi_watchdog);
 
 static void die_nmi(const char *str, struct pt_regs *regs, int do_panic)
 {
+        int this_cpu = smp_processor_id();
+
         if (notify_die(DIE_NMIWATCHDOG, str, regs, 0,
                        pt_regs_trap_type(regs), SIGINT) == NOTIFY_STOP)
                 return;
 
-        console_verbose();
-        bust_spinlocks(1);
-
-        printk(KERN_EMERG "%s", str);
-        printk(" on CPU%d, ip %08lx, registers:\n",
-               smp_processor_id(), regs->tpc);
-        show_regs(regs);
-        dump_stack();
-
-        bust_spinlocks(0);
-
         if (do_panic || panic_on_oops)
-                panic("Non maskable interrupt");
-
-        nmi_exit();
-        local_irq_enable();
-        do_exit(SIGBUS);
+                panic("Watchdog detected hard LOCKUP on cpu %d", this_cpu);
+        else
+                WARN(1, "Watchdog detected hard LOCKUP on cpu %d", this_cpu);
 }
 
 notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)