Andrew Morton | 53ce3d9 | 2009-01-09 12:27:08 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Uniprocessor-only support functions. The counterpart to kernel/smp.c |
| 3 | */ |
| 4 | |
Ingo Molnar | 6e96281 | 2009-01-12 16:04:37 +0100 | [diff] [blame] | 5 | #include <linux/interrupt.h> |
Andrew Morton | 53ce3d9 | 2009-01-09 12:27:08 -0800 | [diff] [blame] | 6 | #include <linux/kernel.h> |
Paul Gortmaker | 9984de1 | 2011-05-23 14:51:41 -0400 | [diff] [blame] | 7 | #include <linux/export.h> |
Andrew Morton | 53ce3d9 | 2009-01-09 12:27:08 -0800 | [diff] [blame] | 8 | #include <linux/smp.h> |
| 9 | |
| 10 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info, |
| 11 | int wait) |
| 12 | { |
Ingo Molnar | 93423b8 | 2009-01-11 05:15:21 +0100 | [diff] [blame] | 13 | WARN_ON(cpu != 0); |
| 14 | |
Andrew Morton | 53ce3d9 | 2009-01-09 12:27:08 -0800 | [diff] [blame] | 15 | local_irq_disable(); |
| 16 | (func)(info); |
| 17 | local_irq_enable(); |
Ingo Molnar | 93423b8 | 2009-01-11 05:15:21 +0100 | [diff] [blame] | 18 | |
Andrew Morton | 53ce3d9 | 2009-01-09 12:27:08 -0800 | [diff] [blame] | 19 | return 0; |
| 20 | } |
| 21 | EXPORT_SYMBOL(smp_call_function_single); |
David Daney | fa68820 | 2013-09-11 14:23:24 -0700 | [diff] [blame^] | 22 | |
| 23 | /* |
| 24 | * Note we still need to test the mask even for UP |
| 25 | * because we actually can get an empty mask from |
| 26 | * code that on SMP might call us without the local |
| 27 | * CPU in the mask. |
| 28 | */ |
| 29 | void on_each_cpu_mask(const struct cpumask *mask, |
| 30 | smp_call_func_t func, void *info, bool wait) |
| 31 | { |
| 32 | unsigned long flags; |
| 33 | |
| 34 | if (cpumask_test_cpu(0, mask)) { |
| 35 | local_irq_save(flags); |
| 36 | func(info); |
| 37 | local_irq_restore(flags); |
| 38 | } |
| 39 | } |
| 40 | EXPORT_SYMBOL(on_each_cpu_mask); |
| 41 | |
| 42 | /* |
| 43 | * Preemption is disabled here to make sure the cond_func is called under the |
| 44 | * same condtions in UP and SMP. |
| 45 | */ |
| 46 | void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), |
| 47 | smp_call_func_t func, void *info, bool wait, |
| 48 | gfp_t gfp_flags) |
| 49 | { |
| 50 | unsigned long flags; |
| 51 | |
| 52 | preempt_disable(); |
| 53 | if (cond_func(0, info)) { |
| 54 | local_irq_save(flags); |
| 55 | func(info); |
| 56 | local_irq_restore(flags); |
| 57 | } |
| 58 | preempt_enable(); |
| 59 | } |
| 60 | EXPORT_SYMBOL(on_each_cpu_cond); |