smp.c (5b929bd11df23922daf1be5d52731cc3900c1d79) smp.c (787047eea24a2443c366679ae6b5a3873a33b64e)
1/*
2 * linux/arch/arm/kernel/smp.c
3 *
4 * Copyright (C) 2002 ARM Limited, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.

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170 return 1;
171}
172
173static int platform_cpu_disable(unsigned int cpu)
174{
175 if (smp_ops.cpu_disable)
176 return smp_ops.cpu_disable(cpu);
177
1/*
2 * linux/arch/arm/kernel/smp.c
3 *
4 * Copyright (C) 2002 ARM Limited, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.

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170 return 1;
171}
172
173static int platform_cpu_disable(unsigned int cpu)
174{
175 if (smp_ops.cpu_disable)
176 return smp_ops.cpu_disable(cpu);
177
178 return 0;
179}
180
181int platform_can_hotplug_cpu(unsigned int cpu)
182{
183 /* cpu_die must be specified to support hotplug */
184 if (!smp_ops.cpu_die)
185 return 0;
186
187 if (smp_ops.cpu_can_disable)
188 return smp_ops.cpu_can_disable(cpu);
189
178 /*
179 * By default, allow disabling all CPUs except the first one,
180 * since this is special on a lot of platforms, e.g. because
181 * of clock tick interrupts.
182 */
190 /*
191 * By default, allow disabling all CPUs except the first one,
192 * since this is special on a lot of platforms, e.g. because
193 * of clock tick interrupts.
194 */
183 return cpu == 0 ? -EPERM : 0;
195 return cpu != 0;
184}
196}
197
185/*
186 * __cpu_disable runs on the processor to be shutdown.
187 */
188int __cpu_disable(void)
189{
190 unsigned int cpu = smp_processor_id();
191 int ret;
192

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573}
574
575void handle_IPI(int ipinr, struct pt_regs *regs)
576{
577 unsigned int cpu = smp_processor_id();
578 struct pt_regs *old_regs = set_irq_regs(regs);
579
580 if ((unsigned)ipinr < NR_IPI) {
198/*
199 * __cpu_disable runs on the processor to be shutdown.
200 */
201int __cpu_disable(void)
202{
203 unsigned int cpu = smp_processor_id();
204 int ret;
205

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586}
587
588void handle_IPI(int ipinr, struct pt_regs *regs)
589{
590 unsigned int cpu = smp_processor_id();
591 struct pt_regs *old_regs = set_irq_regs(regs);
592
593 if ((unsigned)ipinr < NR_IPI) {
581 trace_ipi_entry_rcuidle(ipi_types[ipinr]);
594 trace_ipi_entry(ipi_types[ipinr]);
582 __inc_irq_stat(cpu, ipi_irqs[ipinr]);
583 }
584
585 switch (ipinr) {
586 case IPI_WAKEUP:
587 break;
588
589#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST

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632
633 default:
634 pr_crit("CPU%u: Unknown IPI message 0x%x\n",
635 cpu, ipinr);
636 break;
637 }
638
639 if ((unsigned)ipinr < NR_IPI)
595 __inc_irq_stat(cpu, ipi_irqs[ipinr]);
596 }
597
598 switch (ipinr) {
599 case IPI_WAKEUP:
600 break;
601
602#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST

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645
646 default:
647 pr_crit("CPU%u: Unknown IPI message 0x%x\n",
648 cpu, ipinr);
649 break;
650 }
651
652 if ((unsigned)ipinr < NR_IPI)
640 trace_ipi_exit_rcuidle(ipi_types[ipinr]);
653 trace_ipi_exit(ipi_types[ipinr]);
641 set_irq_regs(old_regs);
642}
643
644void smp_send_reschedule(int cpu)
645{
646 smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE);
647}
648

--- 78 unchanged lines hidden --- 		654 set_irq_regs(old_regs);
655}
656
657void smp_send_reschedule(int cpu)
658{
659 smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE);
660}
661

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