diff options
| -rw-r--r-- | arch/s390/include/asm/smp.h | 5 | ||||
| -rw-r--r-- | arch/s390/kernel/nmi.c | 9 | ||||
| -rw-r--r-- | arch/s390/kernel/smp.c | 30 |
3 files changed, 29 insertions, 15 deletions
diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h index 3deb134587b7..3470274a985c 100644 --- a/arch/s390/include/asm/smp.h +++ b/arch/s390/include/asm/smp.h @@ -27,6 +27,7 @@ extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); extern void smp_call_online_cpu(void (*func)(void *), void *); extern void smp_call_ipl_cpu(void (*func)(void *), void *); +extern void smp_emergency_stop(void); extern int smp_find_processor_id(u16 address); extern int smp_store_status(int cpu); @@ -52,6 +53,10 @@ static inline void smp_call_online_cpu(void (*func)(void *), void *data) func(data); } +static inline void smp_emergency_stop(void) +{ +} + static inline int smp_find_processor_id(u16 address) { return 0; } static inline int smp_store_status(int cpu) { return 0; } static inline int smp_vcpu_scheduled(int cpu) { return 1; } diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c index 31d03a84126c..15e28eefe7e9 100644 --- a/arch/s390/kernel/nmi.c +++ b/arch/s390/kernel/nmi.c @@ -12,6 +12,7 @@ #include <linux/init.h> #include <linux/errno.h> #include <linux/hardirq.h> +#include <linux/kprobes.h> #include <linux/time.h> #include <linux/module.h> #include <linux/sched/signal.h> @@ -38,12 +39,13 @@ struct mcck_struct { static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck); -static void s390_handle_damage(void) +static notrace void s390_handle_damage(void) { - smp_send_stop(); + smp_emergency_stop(); disabled_wait((unsigned long) __builtin_return_address(0)); while (1); } +NOKPROBE_SYMBOL(s390_handle_damage); /* * Main machine check handler function. Will be called with interrupts enabled @@ -275,6 +277,7 @@ static int notrace s390_validate_registers(union mci mci, int umode) return kill_task; } +NOKPROBE_SYMBOL(s390_validate_registers); /* * Backup the guest's machine check info to its description block @@ -300,6 +303,7 @@ static void notrace s390_backup_mcck_info(struct pt_regs *regs) mcck_backup->failing_storage_address = S390_lowcore.failing_storage_address; } +NOKPROBE_SYMBOL(s390_backup_mcck_info); #define MAX_IPD_COUNT 29 #define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */ @@ -443,6 +447,7 @@ void notrace s390_do_machine_check(struct pt_regs *regs) clear_cpu_flag(CIF_MCCK_GUEST); nmi_exit(); } +NOKPROBE_SYMBOL(s390_do_machine_check); static int __init machine_check_init(void) { 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(); } } |