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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 | void __smp_call_function_single(int cpu, struct call_single_data *csd, |
26 | int wait) |
27 | { |
28 | unsigned long flags; |
29 | |
30 | local_irq_save(flags); |
31 | csd->func(csd->info); |
32 | local_irq_restore(flags); |
33 | } |
34 | EXPORT_SYMBOL(__smp_call_function_single); |
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); |
85 |
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