sh: CPU hotplug support. (763142d1) · Commits · e / devices / android_kernel_xiaomi_markw

arch/sh/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -706,6 +706,13 @@ config NR_CPUS
		This is purely to save memory - each supported CPU adds
		approximately eight kilobytes to the kernel image.

		config HOTPLUG_CPU
		bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
		depends on SMP && HOTPLUG && EXPERIMENTAL
		help
		Say Y here to experiment with turning CPUs off and on. CPUs
		can be controlled through /sys/devices/system/cpu.

		source "kernel/Kconfig.preempt"

		config GUSA

+3 −0

Original line number	Diff line number	Diff line
		#ifndef __ASM_SH_IRQ_H
		#define __ASM_SH_IRQ_H

		#include <linux/cpumask.h>
		#include <asm/machvec.h>

		/*
		@@ -50,6 +51,8 @@ static inline int generic_irq_demux(int irq)
		#define irq_demux(irq) sh_mv.mv_irq_demux(irq)

		void init_IRQ(void);
		void migrate_irqs(void);

		asmlinkage int do_IRQ(unsigned int irq, struct pt_regs *regs);

		#ifdef CONFIG_IRQSTACKS

+14 −2

Original line number	Diff line number	Diff line
		@@ -7,20 +7,27 @@ struct plat_smp_ops {
		void (*prepare_cpus)(unsigned int max_cpus);
		void (*start_cpu)(unsigned int cpu, unsigned long entry_point);
		void (*send_ipi)(unsigned int cpu, unsigned int message);
		int (*cpu_disable)(unsigned int cpu);
		void (*cpu_die)(unsigned int cpu);
		void (*play_dead)(void);
		};

		extern struct plat_smp_ops *mp_ops;
		extern struct plat_smp_ops shx3_smp_ops;

		#ifdef CONFIG_SMP

		static inline void plat_smp_setup(void)
		{
		extern struct plat_smp_ops mp_ops; / private */

		BUG_ON(!mp_ops);
		mp_ops->smp_setup();
		}

		static inline void play_dead(void)
		{
		mp_ops->play_dead();
		}

		extern void register_smp_ops(struct plat_smp_ops *ops);

		#else
		@@ -34,6 +41,11 @@ static inline void register_smp_ops(struct plat_smp_ops *ops)
		{
		}

		static inline void play_dead(void)
		{
		BUG();
		}

		#endif /* CONFIG_SMP */

		#endif /* __ASM_SH_SMP_OPS_H */

+18 −1

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		@@ -38,9 +38,26 @@ void smp_timer_broadcast(const struct cpumask *mask);

		void local_timer_interrupt(void);
		void local_timer_setup(unsigned int cpu);
		void local_timer_stop(unsigned int cpu);

		void arch_send_call_function_single_ipi(int cpu);
		extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
		void arch_send_call_function_ipi_mask(const struct cpumask *mask);

		void native_play_dead(void);
		void native_cpu_die(unsigned int cpu);
		int native_cpu_disable(unsigned int cpu);

		#ifdef CONFIG_HOTPLUG_CPU
		void play_dead_common(void);
		extern int __cpu_disable(void);

		static inline void __cpu_die(unsigned int cpu)
		{
		extern struct plat_smp_ops mp_ops; / private */

		mp_ops->cpu_die(cpu);
		}
		#endif

		static inline int hard_smp_processor_id(void)
		{

+5 −1

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@
		#include <asm/pgalloc.h>
		#include <asm/system.h>
		#include <asm/atomic.h>
		#include <asm/smp.h>

		void (*pm_idle)(void) = NULL;

		@@ -89,10 +90,13 @@ void cpu_idle(void)
		while (1) {
		tick_nohz_stop_sched_tick(1);

		while (!need_resched() && cpu_online(cpu)) {
		while (!need_resched()) {
		check_pgt_cache();
		rmb();

		if (cpu_is_offline(cpu))
		play_dead();

		local_irq_disable();
		/* Don't trace irqs off for idle */
		stop_critical_timings();