// 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; 	WARN_ON(cpu != 0); 	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, call_single_data_t *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); int on_each_cpu(smp_call_func_t func, void *info, int wait){	unsigned long flags; 	local_irq_save(flags);	func(info);	local_irq_restore(flags);	return 0;}EXPORT_SYMBOL(on_each_cpu); /* * Note we still need to test the mask even for UP * because we actually can get an empty mask from * code that on SMP might call us without the local * CPU in the mask. */void on_each_cpu_mask(const struct cpumask *mask,		      smp_call_func_t func, void *info, bool wait){	unsigned long flags; 	if (cpumask_test_cpu(0, mask)) {		local_irq_save(flags);		func(info);		local_irq_restore(flags);	}}EXPORT_SYMBOL(on_each_cpu_mask); /* * Preemption is disabled here to make sure the cond_func is called under the * same condtions in UP and SMP. */void on_each_cpu_cond_mask(bool (*cond_func)(int cpu, void *info),			   smp_call_func_t func, void *info, bool wait,			   gfp_t gfp_flags, const struct cpumask *mask){	unsigned long flags; 	preempt_disable();	if (cond_func(0, info)) {		local_irq_save(flags);		func(info);		local_irq_restore(flags);	}	preempt_enable();}EXPORT_SYMBOL(on_each_cpu_cond_mask); void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),		      smp_call_func_t func, void *info, bool wait,		      gfp_t gfp_flags){	on_each_cpu_cond_mask(cond_func, func, info, wait, gfp_flags, NULL);}EXPORT_SYMBOL(on_each_cpu_cond); 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);