| 1 | |
| 2 | * Uniprocessor-only support functions. The counterpart to kernel/smp.c
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| 3 |
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| 4 |
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| 5 | #include <linux/interrupt.h>
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| 6 | #include <linux/kernel.h>
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| 7 | #include <linux/export.h>
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| 8 | #include <linux/smp.h>
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| 9 |
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| 10 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
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| 11 | int wait)
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| 12 | {
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| 13 | unsigned long flags;
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| 14 |
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| 15 | WARN_ON(cpu != 0);
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| 16 |
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| 17 | local_irq_save(flags);
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| 18 | func(info);
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| 19 | local_irq_restore(flags);
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| 20 |
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| 21 | return 0;
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| 22 | }
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| 23 | EXPORT_SYMBOL(smp_call_function_single);
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| 24 |
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| 25 | int on_each_cpu(smp_call_func_t func, void *info, int wait)
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| 26 | {
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| 27 | unsigned long flags;
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| 28 |
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| 29 | local_irq_save(flags);
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| 30 | func(info);
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| 31 | local_irq_restore(flags);
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| 32 | return 0;
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| 33 | }
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| 34 | EXPORT_SYMBOL(on_each_cpu);
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| 35 |
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| 36 | |
| 37 | * Note we still need to test the mask even for UP
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| 38 | * because we actually can get an empty mask from
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| 39 | * code that on SMP might call us without the local
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| 40 | * CPU in the mask.
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| 41 |
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| 42 | void on_each_cpu_mask(const struct cpumask *mask,
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| 43 | smp_call_func_t func, void *info, bool wait)
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| 44 | {
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| 45 | unsigned long flags;
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| 46 |
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| 47 | if (cpumask_test_cpu(0, mask)) {
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| 48 | local_irq_save(flags);
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| 49 | func(info);
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| 50 | local_irq_restore(flags);
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| 51 | }
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| 52 | }
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| 53 | EXPORT_SYMBOL(on_each_cpu_mask);
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| 54 |
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| 55 | |
| 56 | * Preemption is disabled here to make sure the cond_func is called under the
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| 57 | * same condtions in UP and SMP.
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| 58 |
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| 59 | void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
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| 60 | smp_call_func_t func, void *info, bool wait,
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| 61 | gfp_t gfp_flags)
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| 62 | {
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| 63 | unsigned long flags;
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| 64 |
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| 65 | preempt_disable();
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| 66 | if (cond_func(0, info)) {
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| 67 | local_irq_save(flags);
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| 68 | func(info);
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| 69 | local_irq_restore(flags);
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| 70 | }
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| 71 | preempt_enable();
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| 72 | }
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| 73 | EXPORT_SYMBOL(on_each_cpu_cond);
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