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
10int 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}
23EXPORT_SYMBOL(smp_call_function_single);
24
25int 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}
34EXPORT_SYMBOL(smp_call_function_single_async);
35
36int 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}
45EXPORT_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 */
53void 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}
64EXPORT_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 */
70void 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}
84EXPORT_SYMBOL(on_each_cpu_cond);

  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#include <linux/hypervisor.h>
 10
 11int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
 12				int wait)
 13{
 14	unsigned long flags;
 15
 16	WARN_ON(cpu != 0);
 17
 18	local_irq_save(flags);
 19	func(info);
 20	local_irq_restore(flags);
 21
 22	return 0;
 23}
 24EXPORT_SYMBOL(smp_call_function_single);
 25
 26int smp_call_function_single_async(int cpu, call_single_data_t *csd)
 27{
 28	unsigned long flags;
 29
 30	local_irq_save(flags);
 31	csd->func(csd->info);
 32	local_irq_restore(flags);
 33	return 0;
 34}
 35EXPORT_SYMBOL(smp_call_function_single_async);
 36
 37int on_each_cpu(smp_call_func_t func, void *info, int wait)
 38{
 39	unsigned long flags;
 40
 41	local_irq_save(flags);
 42	func(info);
 43	local_irq_restore(flags);
 44	return 0;
 45}
 46EXPORT_SYMBOL(on_each_cpu);
 47
 48/*
 49 * Note we still need to test the mask even for UP
 50 * because we actually can get an empty mask from
 51 * code that on SMP might call us without the local
 52 * CPU in the mask.
 53 */
 54void on_each_cpu_mask(const struct cpumask *mask,
 55		      smp_call_func_t func, void *info, bool wait)
 56{
 57	unsigned long flags;
 58
 59	if (cpumask_test_cpu(0, mask)) {
 60		local_irq_save(flags);
 61		func(info);
 62		local_irq_restore(flags);
 63	}
 64}
 65EXPORT_SYMBOL(on_each_cpu_mask);
 66
 67/*
 68 * Preemption is disabled here to make sure the cond_func is called under the
 69 * same condtions in UP and SMP.
 70 */
 71void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
 72		      smp_call_func_t func, void *info, bool wait,
 73		      gfp_t gfp_flags)
 74{
 75	unsigned long flags;
 76
 77	preempt_disable();
 78	if (cond_func(0, info)) {
 79		local_irq_save(flags);
 80		func(info);
 81		local_irq_restore(flags);
 82	}
 83	preempt_enable();
 84}
 85EXPORT_SYMBOL(on_each_cpu_cond);
 86
 87int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
 88{
 89	int ret;
 90
 91	if (cpu != 0)
 92		return -ENXIO;
 93
 94	if (phys)
 95		hypervisor_pin_vcpu(0);
 96	ret = func(par);
 97	if (phys)
 98		hypervisor_pin_vcpu(-1);
 99
100	return ret;
101}
102EXPORT_SYMBOL_GPL(smp_call_on_cpu);