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Tip revision: d07f6ca923ea0927a1024dfccafc5b53b61cfecc authored by Linus Torvalds on 16 May 2021, 22:27:44 UTC
Linux 5.13-rc2
Linux 5.13-rc2
Tip revision: d07f6ca
up.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Uniprocessor-only support functions. The counterpart to kernel/smp.c
*/
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/smp.h>
#include <linux/hypervisor.h>
int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
int wait)
{
unsigned long flags;
if (cpu != 0)
return -ENXIO;
local_irq_save(flags);
func(info);
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(smp_call_function_single);
int smp_call_function_single_async(int cpu, struct __call_single_data *csd)
{
unsigned long flags;
local_irq_save(flags);
csd->func(csd->info);
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(smp_call_function_single_async);
/*
* Preemption is disabled here to make sure the cond_func is called under the
* same conditions in UP and SMP.
*/
void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func,
void *info, bool wait, const struct cpumask *mask)
{
unsigned long flags;
preempt_disable();
if ((!cond_func || cond_func(0, info)) && cpumask_test_cpu(0, mask)) {
local_irq_save(flags);
func(info);
local_irq_restore(flags);
}
preempt_enable();
}
EXPORT_SYMBOL(on_each_cpu_cond_mask);
int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
{
int ret;
if (cpu != 0)
return -ENXIO;
if (phys)
hypervisor_pin_vcpu(0);
ret = func(par);
if (phys)
hypervisor_pin_vcpu(-1);
return ret;
}
EXPORT_SYMBOL_GPL(smp_call_on_cpu);