1 // SPDX-License-Identifier: GPL-2.0-only
3 * Uniprocessor-only support functions. The counterpart to kernel/smp.c
6 #include <linux/interrupt.h>
7 #include <linux/kernel.h>
8 #include <linux/export.h>
10 #include <linux/hypervisor.h>
12 int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
19 local_irq_save(flags);
21 local_irq_restore(flags);
25 EXPORT_SYMBOL(smp_call_function_single);
27 int smp_call_function_single_async(int cpu, call_single_data_t *csd)
31 local_irq_save(flags);
33 local_irq_restore(flags);
36 EXPORT_SYMBOL(smp_call_function_single_async);
38 int on_each_cpu(smp_call_func_t func, void *info, int wait)
42 local_irq_save(flags);
44 local_irq_restore(flags);
47 EXPORT_SYMBOL(on_each_cpu);
50 * Note we still need to test the mask even for UP
51 * because we actually can get an empty mask from
52 * code that on SMP might call us without the local
55 void on_each_cpu_mask(const struct cpumask *mask,
56 smp_call_func_t func, void *info, bool wait)
60 if (cpumask_test_cpu(0, mask)) {
61 local_irq_save(flags);
63 local_irq_restore(flags);
66 EXPORT_SYMBOL(on_each_cpu_mask);
69 * Preemption is disabled here to make sure the cond_func is called under the
70 * same condtions in UP and SMP.
72 void on_each_cpu_cond_mask(bool (*cond_func)(int cpu, void *info),
73 smp_call_func_t func, void *info, bool wait,
74 gfp_t gfp_flags, const struct cpumask *mask)
79 if (cond_func(0, info)) {
80 local_irq_save(flags);
82 local_irq_restore(flags);
86 EXPORT_SYMBOL(on_each_cpu_cond_mask);
88 void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
89 smp_call_func_t func, void *info, bool wait,
92 on_each_cpu_cond_mask(cond_func, func, info, wait, gfp_flags, NULL);
94 EXPORT_SYMBOL(on_each_cpu_cond);
96 int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
104 hypervisor_pin_vcpu(0);
107 hypervisor_pin_vcpu(-1);
111 EXPORT_SYMBOL_GPL(smp_call_on_cpu);