| 1 | |
| 2 | * Uniprocessor-only support functions. The counterpart to kernel/smp.c
|
| 3 |
|
| 4 |
|
| 5 | #include <linux/interrupt.h>
|
| 6 | #include <linux/kernel.h>
|
| 7 | #include <linux/export.h>
|
| 8 | #include <linux/smp.h>
|
| 9 |
|
| 10 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
|
| 11 | int wait)
|
| 12 | {
|
| 13 | unsigned long flags;
|
| 14 |
|
| 15 | WARN_ON(cpu != 0);
|
| 16 |
|
| 17 | local_irq_save(flags);
|
| 18 | func(info);
|
| 19 | local_irq_restore(flags);
|
| 20 |
|
| 21 | return 0;
|
| 22 | }
|
| 23 | EXPORT_SYMBOL(smp_call_function_single);
|
| 24 |
|
| 25 | int smp_call_function_single_async(int cpu, struct call_single_data *csd)
|
| 26 | {
|
| 27 | unsigned long flags;
|
| 28 |
|
| 29 | local_irq_save(flags);
|
| 30 | csd->func(csd->info);
|
| 31 | local_irq_restore(flags);
|
| 32 | return 0;
|
| 33 | }
|
| 34 | EXPORT_SYMBOL(smp_call_function_single_async);
|
| 35 |
|
| 36 | int on_each_cpu(smp_call_func_t func, void *info, int wait)
|
| 37 | {
|
| 38 | unsigned long flags;
|
| 39 |
|
| 40 | local_irq_save(flags);
|
| 41 | func(info);
|
| 42 | local_irq_restore(flags);
|
| 43 | return 0;
|
| 44 | }
|
| 45 | EXPORT_SYMBOL(on_each_cpu);
|
| 46 |
|
| 47 | |
| 48 | * Note we still need to test the mask even for UP
|
| 49 | * because we actually can get an empty mask from
|
| 50 | * code that on SMP might call us without the local
|
| 51 | * CPU in the mask.
|
| 52 |
|
| 53 | void on_each_cpu_mask(const struct cpumask *mask,
|
| 54 | smp_call_func_t func, void *info, bool wait)
|
| 55 | {
|
| 56 | unsigned long flags;
|
| 57 |
|
| 58 | if (cpumask_test_cpu(0, mask)) {
|
| 59 | local_irq_save(flags);
|
| 60 | func(info);
|
| 61 | local_irq_restore(flags);
|
| 62 | }
|
| 63 | }
|
| 64 | EXPORT_SYMBOL(on_each_cpu_mask);
|
| 65 |
|
| 66 | |
| 67 | * Preemption is disabled here to make sure the cond_func is called under the
|
| 68 | * same condtions in UP and SMP.
|
| 69 |
|
| 70 | void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
|
| 71 | smp_call_func_t func, void *info, bool wait,
|
| 72 | gfp_t gfp_flags)
|
| 73 | {
|
| 74 | unsigned long flags;
|
| 75 |
|
| 76 | preempt_disable();
|
| 77 | if (cond_func(0, info)) {
|
| 78 | local_irq_save(flags);
|
| 79 | func(info);
|
| 80 | local_irq_restore(flags);
|
| 81 | }
|
| 82 | preempt_enable();
|
| 83 | }
|
| 84 | EXPORT_SYMBOL(on_each_cpu_cond);
|