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sparc64: fatal trap should stop all cpus

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"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>
This commit is contained in:
Dave Kleikamp 2015-01-06 18:31:39 -06:00 committed by David S. Miller
parent 8f765b8491
commit 94ab599076
2 changed files with 26 additions and 3 deletions
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27
arch/sparc/kernel/smp_64.c
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@ -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);
}
/**

2
arch/sparc/kernel/traps_64.c
View File

@ -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);