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Commit 94ab5990 authored by Dave Kleikamp's avatar Dave Kleikamp Committed by David S. Miller
Browse files

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: default avatarDave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8f765b84

arch/sparc/kernel/smp_64.c

+24 −3
Original line number Diff line number Diff line
@@ -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);

}



/**

arch/sparc/kernel/traps_64.c

+2 −0
Original line number Diff line number Diff line
@@ -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);