diff options
Diffstat (limited to 'kernel/smp.c')
| -rw-r--r-- | kernel/smp.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/kernel/smp.c b/kernel/smp.c index aff8aa14f547..f38a1e692259 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -13,6 +13,7 @@ #include <linux/gfp.h> #include <linux/smp.h> #include <linux/cpu.h> +#include <linux/sched.h> #include "smpboot.h" @@ -164,7 +165,7 @@ static int generic_exec_single(int cpu, struct call_single_data *csd, if (!csd) { csd = &csd_stack; if (!wait) - csd = &__get_cpu_var(csd_data); + csd = this_cpu_ptr(&csd_data); } csd_lock(csd); @@ -229,7 +230,7 @@ static void flush_smp_call_function_queue(bool warn_cpu_offline) WARN_ON(!irqs_disabled()); - head = &__get_cpu_var(call_single_queue); + head = this_cpu_ptr(&call_single_queue); entry = llist_del_all(head); entry = llist_reverse_order(entry); @@ -419,7 +420,7 @@ void smp_call_function_many(const struct cpumask *mask, return; } - cfd = &__get_cpu_var(cfd_data); + cfd = this_cpu_ptr(&cfd_data); cpumask_and(cfd->cpumask, mask, cpu_online_mask); cpumask_clear_cpu(this_cpu, cfd->cpumask); @@ -699,3 +700,24 @@ void kick_all_cpus_sync(void) smp_call_function(do_nothing, NULL, 1); } EXPORT_SYMBOL_GPL(kick_all_cpus_sync); + +/** + * wake_up_all_idle_cpus - break all cpus out of idle + * wake_up_all_idle_cpus try to break all cpus which is in idle state even + * including idle polling cpus, for non-idle cpus, we will do nothing + * for them. + */ +void wake_up_all_idle_cpus(void) +{ + int cpu; + + preempt_disable(); + for_each_online_cpu(cpu) { + if (cpu == smp_processor_id()) + continue; + + wake_up_if_idle(cpu); + } + preempt_enable(); +} +EXPORT_SYMBOL_GPL(wake_up_all_idle_cpus); |