diff options
Diffstat (limited to 'arch/s390/kernel/smp.c')
| -rw-r--r-- | arch/s390/kernel/smp.c | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index cc04b74fbb84..2dba3e88a972 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -36,6 +36,7 @@ #include <linux/sched/task_stack.h> #include <linux/crash_dump.h> #include <linux/memblock.h> +#include <linux/kprobes.h> #include <asm/asm-offsets.h> #include <asm/diag.h> #include <asm/switch_to.h> @@ -422,13 +423,17 @@ void smp_yield_cpu(int cpu) * Send cpus emergency shutdown signal. This gives the cpus the * opportunity to complete outstanding interrupts. */ -static void smp_emergency_stop(cpumask_t *cpumask) +void notrace smp_emergency_stop(void) { + cpumask_t cpumask; u64 end; int cpu; + cpumask_copy(&cpumask, cpu_online_mask); + cpumask_clear_cpu(smp_processor_id(), &cpumask); + end = get_tod_clock() + (1000000UL << 12); - for_each_cpu(cpu, cpumask) { + for_each_cpu(cpu, &cpumask) { struct pcpu *pcpu = pcpu_devices + cpu; set_bit(ec_stop_cpu, &pcpu->ec_mask); while (__pcpu_sigp(pcpu->address, SIGP_EMERGENCY_SIGNAL, @@ -437,21 +442,21 @@ static void smp_emergency_stop(cpumask_t *cpumask) cpu_relax(); } while (get_tod_clock() < end) { - for_each_cpu(cpu, cpumask) + for_each_cpu(cpu, &cpumask) if (pcpu_stopped(pcpu_devices + cpu)) - cpumask_clear_cpu(cpu, cpumask); - if (cpumask_empty(cpumask)) + cpumask_clear_cpu(cpu, &cpumask); + if (cpumask_empty(&cpumask)) break; cpu_relax(); } } +NOKPROBE_SYMBOL(smp_emergency_stop); /* * Stop all cpus but the current one. */ void smp_send_stop(void) { - cpumask_t cpumask; int cpu; /* Disable all interrupts/machine checks */ @@ -459,17 +464,16 @@ void smp_send_stop(void) trace_hardirqs_off(); debug_set_critical(); - cpumask_copy(&cpumask, cpu_online_mask); - cpumask_clear_cpu(smp_processor_id(), &cpumask); if (oops_in_progress) - smp_emergency_stop(&cpumask); + smp_emergency_stop(); /* stop all processors */ - for_each_cpu(cpu, &cpumask) { - struct pcpu *pcpu = pcpu_devices + cpu; - pcpu_sigp_retry(pcpu, SIGP_STOP, 0); - while (!pcpu_stopped(pcpu)) + for_each_online_cpu(cpu) { + if (cpu == smp_processor_id()) + continue; + pcpu_sigp_retry(pcpu_devices + cpu, SIGP_STOP, 0); + while (!pcpu_stopped(pcpu_devices + cpu)) cpu_relax(); } } |