diff options
Diffstat (limited to 'arch/powerpc/kernel/smp.c')
| -rw-r--r-- | arch/powerpc/kernel/smp.c | 37 |
1 files changed, 29 insertions, 8 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index cefeee81c52e..be35ffae10f0 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -76,6 +76,8 @@ void smp_call_function_interrupt(void); int smt_enabled_at_boot = 1; +static int ipi_fail_ok; + static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; #ifdef CONFIG_PPC64 @@ -204,8 +206,6 @@ static int __smp_call_function_map(void (*func) (void *info), void *info, if (wait) atomic_set(&data.finished, 0); - spin_lock(&call_lock); - /* remove 'self' from the map */ if (cpu_isset(smp_processor_id(), map)) cpu_clear(smp_processor_id(), map); @@ -232,7 +232,8 @@ static int __smp_call_function_map(void (*func) (void *info), void *info, printk("smp_call_function on cpu %d: other cpus not " "responding (%d)\n", smp_processor_id(), atomic_read(&data.started)); - debugger(NULL); + if (!ipi_fail_ok) + debugger(NULL); goto out; } } @@ -259,15 +260,18 @@ static int __smp_call_function_map(void (*func) (void *info), void *info, out: call_data = NULL; HMT_medium(); - spin_unlock(&call_lock); return ret; } static int __smp_call_function(void (*func)(void *info), void *info, int nonatomic, int wait) { - return __smp_call_function_map(func, info, nonatomic, wait, + int ret; + spin_lock(&call_lock); + ret =__smp_call_function_map(func, info, nonatomic, wait, cpu_online_map); + spin_unlock(&call_lock); + return ret; } int smp_call_function(void (*func) (void *info), void *info, int nonatomic, @@ -293,9 +297,11 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info, return -EINVAL; cpu_set(cpu, map); - if (cpu != get_cpu()) + if (cpu != get_cpu()) { + spin_lock(&call_lock); ret = __smp_call_function_map(func, info, nonatomic, wait, map); - else { + spin_unlock(&call_lock); + } else { local_irq_disable(); func(info); local_irq_enable(); @@ -307,7 +313,22 @@ EXPORT_SYMBOL(smp_call_function_single); void smp_send_stop(void) { - __smp_call_function(stop_this_cpu, NULL, 1, 0); + int nolock; + + /* It's OK to fail sending the IPI, since the alternative is to + * be stuck forever waiting on the other CPU to take the interrupt. + * + * It's better to at least continue and go through reboot, since this + * function is usually called at panic or reboot time in the first + * place. + */ + ipi_fail_ok = 1; + + /* Don't deadlock in case we got called through panic */ + nolock = !spin_trylock(&call_lock); + __smp_call_function_map(stop_this_cpu, NULL, 1, 0, cpu_online_map); + if (!nolock) + spin_unlock(&call_lock); } void smp_call_function_interrupt(void) |